{"id":979,"date":"2013-08-20T15:00:10","date_gmt":"2013-08-20T07:00:10","guid":{"rendered":"http:\/\/www.dogeye.net\/?p=979"},"modified":"2013-08-20T15:00:10","modified_gmt":"2013-08-20T07:00:10","slug":"%e6%88%91%e7%9a%84%e6%af%95%e4%b8%9a%e8%ae%ba%e6%96%87-linux%e6%a1%8c%e9%9d%a2%e7%8e%af%e5%a2%83%e4%b8%8b%e5%86%85%e5%ad%98%e5%8e%bb%e9%87%8d%e6%8a%80%e6%9c%af%e7%9a%84-%e7%a0%94%e7%a9%b6%e4%b8%8e","status":"publish","type":"post","link":"https:\/\/ykyi.net\/?p=979","title":{"rendered":"\u6211\u7684\u6bd5\u4e1a\u8bba\u6587.Linux\u684c\u9762\u73af\u5883\u4e0b\u5185\u5b58\u53bb\u91cd\u6280\u672f\u7684 \u7814\u7a76\u4e0e\u5b9e\u73b0"},"content":{"rendered":"

\u628a\u6211\u7684\u6bd5\u4e1a\u8bba\u6587\u653e\u4e0a\u6765\uff0c\u76f4\u63a5\u4eceword\u590d\u5236\uff0c\u6240\u4ee5\u56fe\u7247\u4f1a\u4e22\u5931\u3002<\/p>\n

\u5728\u8fd9\u91cc\u53ef\u4ee5\u4e0b\u8f7d\u539f\u7a3f www.ykyi.net\/upload\/Research_and_Implementation_of_Memory_Deduplication_in_the_Linux_Desktop_Environment.pdf<\/span><\/a><\/strong><\/p>\n

\u4e2d\u5c71\u5927\u5b66\u7855\u58eb\u5b66\u4f4d\u8bba\u6587<\/p>\n

Linux\u684c\u9762\u73af\u5883\u4e0b\u5185\u5b58\u53bb\u91cd\u6280\u672f\u7684. based on KSM<\/p>\n

\u7814\u7a76\u4e0e\u5b9e\u73b0<\/p>\n

Research and Implementation of Memory Deduplication in<\/p>\n

The Linux Desktop Environment<\/p>\n

 <\/p>\n\n\n\n\n
\n

\u5b66\u4f4d\u7533\u8bf7\u4eba\uff1a<\/p>\n<\/td>\n

\n

\u5468\u9704<\/p>\n<\/td>\n<\/tr>\n

\n

\u5bfc\u5e08\u59d3\u540d\u53ca\u804c\u79f0\uff1a<\/p>\n<\/td>\n

\n

\u738b\u5e38\u5409\u526f\u6559\u6388<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n<\/div>\n

\n

\u8bba\u6587\u539f\u521b\u6027\u58f0\u660e<\/p>\n

\u672c\u4eba\u90d1\u91cd\u58f0\u660e\uff1a\u6240\u5448\u4ea4\u7684\u5b66\u4f4d\u8bba\u6587\uff0c\u662f\u672c\u4eba\u5728\u5bfc\u5e08\u7684\u6307\u5bfc\u4e0b\uff0c\u72ec\u7acb\u8fdb\u884c\u7814\u7a76\u5de5\u4f5c\u6240\u53d6\u5f97\u7684\u6210\u679c\u3002\u9664\u6587\u4e2d\u5df2\u7ecf\u6ce8\u660e\u5f15\u7528\u7684\u5185\u5bb9\u5916\uff0c\u672c\u8bba\u6587\u4e0d\u5305\u542b\u4efb\u4f55\u5176\u4ed6\u4e2a\u4eba\u6216\u96c6\u4f53\u5df2\u7ecf\u53d1\u8868\u6216\u64b0\u5199\u8fc7\u7684\u4f5c\u54c1\u6210\u679c\u3002\u5bf9\u672c\u6587\u7684\u7814\u7a76\u505a\u51fa\u91cd\u8981\u8d21\u732e\u7684\u4e2a\u4eba\u548c\u96c6\u4f53\uff0c\u5747\u5df2\u5728\u6587\u4e2d\u4ee5\u660e\u786e\u65b9\u5f0f\u6807\u660e\u3002\u672c\u4eba\u5b8c\u5168\u610f\u8bc6\u5230\u672c\u58f0\u660e\u7684\u6cd5\u5f8b\u7ed3\u679c\u7531\u672c\u4eba\u627f\u62c5\u3002<\/p>\n

 <\/p>\n

\u5b66\u4f4d\u8bba\u6587\u4f5c\u8005\u7b7e\u540d\uff1a<\/p>\n

\u65e5\u671f\uff1a \u5e74  \u6708  \u65e5<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

\u5b66\u4f4d\u8bba\u6587\u4f7f\u7528\u6388\u6743\u58f0\u660e<\/p>\n

\u672c\u4eba\u5b8c\u5168\u4e86\u89e3\u4e2d\u5c71\u5927\u5b66\u6709\u5173\u4fdd\u7559\u3001\u4f7f\u7528\u5b66\u4f4d\u8bba\u6587\u7684\u89c4\u5b9a\uff0c\u5373\uff1a\u5b66\u6821\u6709\u6743\u4fdd\u7559\u5b66\u4f4d\u8bba\u6587\u5e76\u5411\u56fd\u5bb6\u4e3b\u7ba1\u90e8\u95e8\u6216\u5176\u6307\u5b9a\u673a\u6784\u9001\u4ea4\u8bba\u6587\u7684\u7535\u5b50\u7248\u548c\u7eb8\u8d28\u7248\uff1b\u6709\u6743\u5c06\u5b66\u4f4d\u8bba\u6587\u7528\u4e8e\u975e\u8d62\u5229\u76ee\u7684\u7684\u5c11\u91cf\u590d\u5236\u5e76\u5141\u8bb8\u8bba\u6587\u8fdb\u5165\u5b66\u6821\u56fe\u4e66\u9986\u3001\u9662\u7cfb\u8d44\u6599\u5ba4\u88ab\u67e5\u9605\uff1b\u6709\u6743\u5c06\u5b66\u4f4d\u8bba\u6587\u7684\u5185\u5bb9\u7f16\u5165\u6709\u5173\u6570\u636e\u5e93\u8fdb\u884c\u68c0\u7d22\uff1b\u53ef\u4ee5\u91c7\u7528\u590d\u5370\u3001\u7f29\u5370\u6216\u5176\u4ed6\u65b9\u6cd5\u4fdd\u5b58\u5b66\u4f4d\u8bba\u6587\uff1b\u53ef\u4ee5\u4e3a\u5b58\u5728\u9986\u9645\u5408\u4f5c\u5173\u7cfb\u7684\u5144\u5f1f\u9ad8\u6821\u7528\u6237\u63d0\u4f9b\u6587\u732e\u4f20\u9012\u670d\u52a1\u548c\u4ea4\u6362\u670d\u52a1\u3002<\/p>\n

\u4fdd\u5bc6\u8bba\u6587\u4fdd\u5bc6\u671f\u6ee1\u540e\uff0c\u9002\u7528\u672c\u58f0\u660e\u3002<\/p>\n

 <\/p>\n

\u5b66\u4f4d\u8bba\u6587\u4f5c\u8005\u7b7e\u540d\uff1a                       \u5bfc\u5e08\u7b7e\u540d\uff1a<\/p>\n

\u65e5\u671f\uff1a  \u5e74  \u6708  \u65e5                       \u65e5\u671f\uff1a  \u5e74  \u6708  \u65e5<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n<\/div>\n

\n

\u8bba\u6587\u9898\u76ee\uff1a Linux\u684c\u9762\u73af\u5883\u4e0b\u5185\u5b58\u53bb\u91cd\u6280\u672f\u7684\u7814\u7a76\u4e0e\u5b9e\u73b0<\/p>\n

\u4e13\u4e1a\uff1a\u8f6f\u4ef6\u5de5\u7a0b <\/p>\n

\u7855\u58eb\u751f\uff1a\u5468\u9704<\/p>\n

\u6307\u5bfc\u6559\u5e08\uff1a\u738b\u5e38\u5409 <\/p>\n

\u6458  \u8981<\/p>\n

\u5185\u5b58\u7ba1\u7406\u662f\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u81f3\u5173\u91cd\u8981\u7684\u90e8\u5206\u3002\u4f18\u79c0\u7684\u64cd\u4f5c\u7cfb\u7edf\u9ad8\u6548\u5730\u7ba1\u7406\u6709\u9650\u7684\u5185\u5b58\u8d44\u6e90\u3002Linux\u5185\u6838\u7684\u5185\u6838\u540c\u9875\u5408\u5e76\uff08KSM\uff09\u6a21\u5757\u662f\u5728\u865a\u62df\u5316\u5174\u8d77\u540e\u4e3a\u8282\u7701\u865a\u62df\u673a\u4f7f\u7528\u7684\u5185\u5b58\u800c\u53d1\u5c55\u7684\u4e00\u79cd\u8282\u7ea6\u5185\u5b58\u7684\u6280\u672f\u3002KSM\u901a\u8fc7\u5408\u5e76\u76f8\u540c\u5185\u5bb9\u9875\u9762\u7684\u65b9\u5f0f\u663e\u8457\u5730\u964d\u4f4e\u4e86\u591a\u4e2a\u57fa\u4e8e\u5185\u6838\u865a\u62df\u673a\uff08KVM\uff09\u6280\u672f\u7684\u865a\u62df\u673a\u540c\u65f6\u8fd0\u884c\u65f6\u7cfb\u7edf\u4f7f\u7528\u7684\u5185\u5b58\u3002\u5b9e\u9645\u4e0a\uff0cKSM\u4e5f\u80fd\u5408\u5e76\u4e00\u822c\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u76f8\u540c\u5185\u5bb9\u9875\u9762\u3002\u4f46\u4e00\u822c\u5e94\u7528\u7a0b\u5e8f\u4e3a\u4e86\u4f7f\u7528KSM\u6280\u672f\u5408\u5e76\u5185\u5b58\uff0c\u9700\u8981\u5728\u6e90\u4ee3\u7801\u7ea7\u522b\u663e\u5f0f\u5730\u8c03\u7528\u76f8\u5e94\u7684\u7cfb\u7edf\u8c03\u7528\u6765\u544a\u77e5KSM\u9700\u8981\u626b\u63cf\u7684\u5185\u5b58\u533a\u57df\u3002\u5bf9\u4e8e\u4e00\u822c\u7528\u6237\u6765\u8bf4\uff0c\u9700\u8981\u4fee\u6539\u5e94\u7528\u7a0b\u5e8f\u7684\u6e90\u4ee3\u7801\u663e\u7136\u662f\u4e00\u4e2a\u592a\u9ad8\u7684\u95e8\u69db\u3002<\/p>\n

\u672c\u8bba\u6587\u5728\u8ba4\u771f\u7814\u7a76\u4e86KSM\u6a21\u5757\u7684\u5b9e\u73b0\u7684\u57fa\u7840\u4e0a\uff0c\u589e\u5f3a\u4e86KSM\u7684\u529f\u80fd\u3002\u65b0\u8bbe\u8ba1\u5b9e\u73b0\u7684KSM+\u4f7f\u5f97\u7528\u6237\u53ef\u4ee5\u4e0d\u5fc5\u4fee\u6539\u5e94\u7528\u7a0b\u5e8f\u7684\u6e90\u4ee3\u7801\u5c31\u80fd\u5229\u7528KSM+\u5408\u5e76\u76f8\u540c\u5185\u5bb9\u7684\u5185\u5b58\u9875\u9762\u3002\u53e6\u5916\u539f\u6765\u7684KSM\u7b97\u6cd5\u4f9d\u8d56\u7a0b\u5e8f\u6307\u5b9a\u7684\u5185\u5b58\u533a\u57df\u6709\u5927\u91cf\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\uff0c\u800c\u5b9e\u9645\u4e0a\uff0c\u4e00\u822c\u5e94\u7528\u7a0b\u5e8f\u5e76\u6ca1\u6709\u5927\u91cf\u7684\u91cd\u590d\u5185\u5b58\u3002\u5728\u91cd\u590d\u5185\u5b58\u975e\u5e38\u5c11\u7684\u60c5\u51b5\u4e0b\uff0c\u5bf9\u8fd9\u4e9b\u7a0b\u5e8f\u5e94\u7528KSM\u6280\u672f\u975e\u4f46\u4e0d\u80fd\u964d\u4f4e\u5185\u5b58\u4f7f\u7528\uff0c\u800c\u4e14\u56e0\u4e3a\u8fd0\u884cKSM\u672c\u8eab\u6240\u9700\u5185\u5b58\u800c\u589e\u52a0\u4e86\u5185\u5b58\u5f00\u9500\u3002\u672c\u8bba\u6587\u9488\u5bf9\u8fd9\u4e00\u70b9\u5728KSM\u7684\u7b97\u6cd5\u4e0a\u505a\u4e86\u6539\u8fdb\uff0c\u51cf\u5c11\u4e86\u8fd0\u884cKSM+\u7b97\u6cd5\u672c\u8eab\u6240\u6d88\u8017\u7684\u5185\u5b58\u3002\u7136\u540e\u8bba\u6587\u7528Linux\u684c\u9762\u4e0b\u7684\u5e38\u7528\u5e94\u7528\u7a0b\u5e8f\u9a8c\u8bc1\u4e86KSM+\u7684\u5b9e\u9645\u6548\u679c\uff0c\u5e76\u6784\u9020\u4e86\u4e00\u4e2a\u5b9e\u9a8c\u6bd4\u8f83\u4e86KSM\u548cKSM+\u3002\u6700\u540e\uff0c\u4e3a\u4e86\u4e86\u89e3\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u7279\u70b9\uff0c\u8fd8\u7f16\u5199\u4e86\u4e13\u95e8\u7edf\u8ba1\u91cd\u590d\u9875\u9762\u7684\u5185\u6838\u6a21\u5757\uff0c\u53d1\u73b0\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u9875\u9762\u7684\u4e00\u4e9b\u89c4\u5f8b\uff0c\u4e3a\u6301\u7eed\u6539\u8fdbKSM+\u63d0\u4f9b\u4e86\u4f9d\u636e\u3002<\/p>\n

 <\/p>\n

\u5173\u952e\u8bcd\uff1aKSM\uff0c\u91cd\u590d\u5185\u5b58\u5408\u5e76 \uff0c\u5185\u5b58\u7ba1\u7406<\/p>\n

 <\/p>\n

Title: Research and Implementation of Memory Deduplication in The Linux Desktop Environment<\/p>\n

Major: Software Engineering<\/p>\n

Name: Zhou Xiao<\/p>\n

Supervisor: Wang Changji<\/p>\n

Abstract<\/p>\n

Memory management is one of the most important parts of the operating system. KSM (Kernel Samepage Merging) in Linux kernel is a kind of memory saving technology developed after the emerging of virtual machine. KSM can dramatically decrease the memory usage of the hypervisor running several virtual machines. Actually, KSM can also be applied to normal applications. But in order to use the KSM, application must explicitly evoke a system call in source code level to tell KSM the memory area where the KSM will scan. To normal users, modifying the source code is impossible at most of the time.<\/p>\n

Base on the full grasp of the implementation of KSM, a new implementation named KSM+ is created, which allows users to merge same-content pages on the specified applications without modifying corresponding source code. Moreover, the original KSM algorithm relies heavily on the specified area is rich in same-content pages, while normal applications have much less same-content pages compared to virtual machines. So, when KSM is applied to those applications, it is possible that memory usage will rise rather than decrease. To combat with this situation, KSM+ employs a new algorithm to decrease the memory usage for running itself. Several experiments prove that the KSM+ can be easily applied to specified applications and memory usage can be reduced. And a case is designed to compare the effect between KSM and KSM+, which shows KSM+ behaves better in deduplication when the same-content pages’ density is very low. At last, in order to inspect the characteristics of same-content pages from normal desktop applications, an ad-hoc kernel module is developed to do the statistics which supplies significant data for the further development of KSM+.<\/p>\n

Key Words\uff1a KSM, Deduplication, Memory Management<\/p>\n

 <\/p>\n<\/div>\n

\n

\u76ee   \u5f55<\/p>\n

\u6458  \u8981 I<\/a><\/p>\n

Abstract III<\/a><\/p>\n

\u7b2c\u4e00\u7ae0 \u7eea\u8bba 1<\/a><\/p>\n

1.1 \u8bfe\u9898\u80cc\u666f 1<\/a><\/p>\n

1.2 \u56fd\u5185\u5916\u7814\u7a76\u73b0\u72b6 2<\/a><\/p>\n

1.3 \u7814\u7a76\u610f\u4e49 3<\/a><\/p>\n

1.4 \u8bba\u6587\u7684\u4e3b\u8981\u5de5\u4f5c 3<\/a><\/p>\n

1.5 \u8bba\u6587\u7684\u6574\u4f53\u7ed3\u6784\u5e03\u5c40 3<\/a><\/p>\n

1.6 \u672c\u7ae0\u5c0f\u7ed3 4<\/a><\/p>\n

\u7b2c\u4e8c\u7ae0 \u76f8\u5173\u7406\u8bba\u4e0e\u6280\u672f 5<\/a><\/p>\n

2.1 \u5185\u5b58\u7ba1\u7406 5<\/a><\/p>\n

2.1.1 \u5185\u5b58\u5730\u5740 5<\/a><\/p>\n

2.1.2 \u6bb5\u9875\u5f0f\u5185\u5b58\u7ba1\u7406 6<\/a><\/p>\n

2.1.3 \u5185\u6838\u4e2d\u7684\u5de8\u9875 8<\/a><\/p>\n

2.1.4 \u5185\u5b58\u63cf\u8ff0\u7b26 9<\/a><\/p>\n

2.1.5 \u865a\u62df\u5185\u5b58\u533a\u57df 10<\/a><\/p>\n

2.1.6 Slab\u5c42 11<\/a><\/p>\n

2.2 \u5185\u6838\u5f00\u53d1 12<\/a><\/p>\n

2.2.1 Linux\u5185\u6838\u7b80\u4ecb 12<\/a><\/p>\n

2.2.2 \u5185\u6838\u7ebf\u7a0b 13<\/a><\/p>\n

2.2.3 \u5185\u6838\u7684\u540c\u6b65\u673a\u5236 13<\/a><\/p>\n

2.2.4 \u5185\u6838\u7684\u8c03\u8bd5\u6280\u672f 14<\/a><\/p>\n

2.3 \u672c\u7ae0\u5c0f\u7ed3 16<\/a><\/p>\n

\u7b2c\u4e09\u7ae0 KSM\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0 17<\/a><\/p>\n

3.1 KSM\u7b80\u4ecb 17<\/a><\/p>\n

3.2 KSM\u7684\u4f7f\u7528 17<\/a><\/p>\n

3.2.1 \u901a\u8fc7sysfs\u4f7f\u7528KSM 18<\/a><\/p>\n

3.2.2 KSM\u7684\u7f16\u7a0b\u63a5\u53e3 18<\/a><\/p>\n

3.3 KSM\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0 19<\/a><\/p>\n

3.3.1 KSM\u7684\u57fa\u672c\u7b97\u6cd5 19<\/a><\/p>\n

3.3.2 \u7a33\u5b9a\u6811 21<\/a><\/p>\n

3.3.3 \u4e0d\u7a33\u5b9a\u6811 22<\/a><\/p>\n

3.3.4 KSM\u7684\u6548\u7387 23<\/a><\/p>\n

3.4 \u5173\u952e\u4ee3\u7801\u5206\u6790 24<\/a><\/p>\n

3.4.1 KSM\u7684\u4e3b\u8981\u6570\u636e\u7ed3\u6784 24<\/a><\/p>\n

3.4.2 \u5408\u5e76\u9875\u9762 27<\/a><\/p>\n

3.5 \u672c\u7ae0\u5c0f\u7ed3 29<\/a><\/p>\n

\u7b2c\u56db\u7ae0 KSM+\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0 30<\/a><\/p>\n

4.1 KSM+\u7684\u8bbe\u8ba1 30<\/a><\/p>\n

4.1.1 KSM+\u7684\u8bbe\u8ba1\u76ee\u6807 30<\/a><\/p>\n

4.1.2 \u65b0\u7684\u7528\u6237\u4ea4\u4e92\u65b9\u5f0f 30<\/a><\/p>\n

4.1.3 \u65b0\u7684\u626b\u63cf\u7b97\u6cd5 31<\/a><\/p>\n

4.1.4 KSM+\u7684\u6027\u80fd 33<\/a><\/p>\n

4.2 KSM+\u7684\u5b9e\u73b0 34<\/a><\/p>\n

4.2.1 \u7528\u6237\u4ea4\u4e92\u65b9\u5f0f\u7684\u6838\u5fc3\u4ee3\u7801 34<\/a><\/p>\n

4.2.2 \u626b\u63cf\u7b97\u6cd5\u7684\u6838\u5fc3\u4ee3\u7801 36<\/a><\/p>\n

4.3 \u672c\u7ae0\u5c0f\u7ed3 39<\/a><\/p>\n

\u7b2c\u4e94\u7ae0 \u5b9e\u9a8c\u7ed3\u679c\u53ca\u5206\u6790 40<\/a><\/p>\n

5.1 KSM+\u7684\u5b9e\u9a8c\u7ed3\u679c 40<\/a><\/p>\n

5.1.1 \u9488\u5bf9\u6709\u5927\u91cf\u91cd\u590d\u9875\u9762\u7684\u7a0b\u5e8f 40<\/a><\/p>\n

5.1.2 \u9488\u5bf9Linux\u684c\u9762\u7684\u5e38\u7528\u7a0b\u5e8f 42<\/a><\/p>\n

5.2 KSM\u4e0eKSM+\u7684\u5bf9\u6bd4 46<\/a><\/p>\n

5.2.1 \u81ea\u52a8\u91c7\u96c6\u4ee3\u66ff\u6e90\u4ee3\u7801\u7ea7\u663e\u5f0f\u6307\u5b9a 46<\/a><\/p>\n

5.2.2 \u66f4\u7701\u5185\u5b58 47<\/a><\/p>\n

5.2.3 \u5b9e\u9a8c\u9a8c\u8bc1 47<\/a><\/p>\n

5.3 \u91cd\u590d\u9875\u9762\u7684\u7edf\u8ba1\u5206\u6790 49<\/a><\/p>\n

5.3.1 \u7f16\u5199\u7edf\u8ba1\u91cd\u590d\u9875\u9762\u7684\u5185\u6838\u6a21\u5757 49<\/a><\/p>\n

5.3.1\u91cd\u590d\u9875\u9762\u7684\u7edf\u8ba1\u5206\u6790 51<\/a><\/p>\n

5.4 \u672c\u7ae0\u5c0f\u7ed3 53<\/a><\/p>\n

\u7b2c\u516d\u7ae0 \u603b\u7ed3\u4e0e\u5c55\u671b 54<\/a><\/p>\n

6.1 \u5168\u6587\u603b\u7ed3 54<\/a><\/p>\n

6.2 \u672a\u6765\u5c55\u671b 54<\/a><\/p>\n

6.3 \u672c\u7ae0\u5c0f\u7ed3 55<\/a><\/p>\n

\u53c2\u8003\u6587\u732e 56<\/a><\/p>\n

\u81f4    \u8c22 59<\/a><\/p>\n

 <\/p>\n<\/div>\n

\n

\u7b2c\u4e00\u7ae0 \u7eea\u8bba<\/h1>\n

1.1 \u8bfe\u9898\u80cc\u666f<\/h2>\n

\u5185\u5b58\u662f\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u6700\u4e3a\u91cd\u8981\u7684\u8d44\u6e90\u4e4b\u4e00\u3002\u4e3a\u4e86\u6700\u6709\u6548\u5730\u5229\u7528\u597d\u6709\u9650\u7684\u5185\u5b58\u8d44\u6e90\uff0c\u73b0\u4ee3\u64cd\u4f5c\u7cfb\u7edf\u4f7f\u7528\u4e86\u5f88\u591a\u6280\u672f\u4ee5\u8282\u7701\u5185\u5b58\u7684\u4f7f\u7528\u3002\u5728Linux\u7a0b\u5e8f\u7684\u5185\u5b58\u5e03\u5c40\u4e2d\uff0c\u4ee3\u7801\u6bb5\u5177\u6709\u53ea\u8bfb\u5c5e\u6027\uff0c\u6c38\u8fdc\u662f\u5171\u4eab\u7684\u3002\u5177\u4f53\u5730\u8bf4\uff0c\u5373\u4f7f\u4e00\u4e2a\u7a0b\u5e8f\u88ab\u5b9e\u4f8b\u5316\u4e86\u591a\u4e2a\u8fdb\u7a0b\uff0c\u4f46\u662f\u5728\u7269\u7406\u5185\u5b58\u4e2d\u5bf9\u4e8e\u8be5\u7a0b\u5e8f\u7684\u4ee3\u7801\u53ea\u6709\u4e00\u4efd\u62f7\u8d1d\uff0c\u540c\u4e00\u4e2a\u7a0b\u5e8f\u7684\u4e0d\u540c\u8fdb\u7a0b\u4e4b\u95f4\u5171\u4eab\u8fd9\u4efd\u62f7\u8d1d\u3002\u800c\u4e14\uff0c\u6240\u6709\u5171\u4eab\u5e93\uff08Windows\u4e0b\u88ab\u79f0\u4e4b\u4e3a\u52a8\u6001\u94fe\u63a5\u5e93\uff09\u7684\u4ee3\u7801\u6bb5\u5728\u7269\u7406\u5185\u5b58\u4e2d\u4e5f\u53ea\u6709\u4e00\u4efd\u62f7\u8d1d[1]\uff0c\u6240\u6709\u52a0\u8f7d\u4e86\u8be5\u5171\u4eab\u5e93\u7684\u8fdb\u7a0b\u867d\u7136\u628a\u5171\u4eab\u5e93\u52a0\u8f7d\u5230\u4e86\u4e0d\u540c\u7684\u865a\u62df\u5730\u5740\u4e2d\uff0c\u4f46\u5b9e\u9645\u4e0a\u90fd\u6620\u5c04\u5230\u76f8\u540c\u7684\u7269\u7406\u5730\u5740\u4e0a\u4ee5\u5b9e\u73b0\u5bf9\u5171\u4eab\u5e93\u4ee3\u7801\u533a\u7684\u5171\u4eab\u3002\u9664\u4e86\u5171\u4eab\u53ea\u8bfb\u7684\u4ee3\u7801\u533a\u5916\uff0c\u53ef\u5199\u7684\u9875\u9762\u4e5f\u53ef\u80fd\u5728\u8fdb\u7a0b\u4e4b\u95f4\u88ab\u5171\u4eab\uff0cLinux\u5728\u521b\u5efa\u8fdb\u7a0b\u65f6\u7684fork\u64cd\u4f5c\u4f7f\u7528\u5199\u65f6\u62f7\u8d1d\u6280\u672f\u5728\u7236\u5b50\u8fdb\u7a0b\u4e4b\u95f4\u5171\u4eab\u5185\u5b58\u3002\u5f53\u7236\u8fdb\u7a0b\u8c03\u7528fork()\u51fd\u6570\u540e\uff0c\u6240\u6709\u7684\u53ef\u5199\u9875\u9762\u8f6c\u6210\u5199\u65f6\u62f7\u8d1d\u9875\u9762\u3002\u53ea\u8981\u7236\u5b50\u8fdb\u7a0b\u90fd\u4e0d\u5199\u5165\u67d0\u9875\u9762\uff0c\u5219\u8be5\u9875\u9762\u4e00\u76f4\u88ab\u5171\u4eab\u3002<\/p>\n

\u8fd1\u5e74\u6765\uff0cLinux\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u51fa\u73b0\u4e86\u4e00\u79cd\u65b0\u7684\u8282\u7701\u5185\u5b58\u7684\u6280\u672f\uff0c\u5b83\u7684\u51fa\u73b0\u6e90\u4e8e\u4e91\u8ba1\u7b97\u7684\u53d1\u5c55\u3002\u4e91\u8ba1\u7b97\u80fd\u591f\u901a\u8fc7\u4e92\u8054\u7f51\u6309\u9700\u5206\u53d1\u8ba1\u7b97\u673a\u7684\u8f6f\u786c\u4ef6\u8d44\u6e90\uff0c\u88ab\u79f0\u4e4b\u4e3aIT\u4ea7\u4e1a\u7684\u53c8\u4e00\u6b21\u9769\u547d[2]\u3002\u865a\u62df\u673a\u6280\u672f\u662f\u4e91\u8ba1\u7b97\u7684\u57fa\u7840\uff0cXen\u548cKVM(Kernel Virtual Machine\uff0c\u5185\u6838\u865a\u62df\u673a)\u662f\u5f00\u6e90\u793e\u533a\u6700\u6d41\u884c\u7684\u4e24\u79cd\u865a\u62df\u5316\u6280\u672f[3]\u3002\u901a\u8fc7\u8fd0\u7528\u865a\u62df\u5316\u6280\u672f\uff0c\u8d8a\u6765\u8d8a\u591a\u7684Linux\u4e3b\u673a\u4e0a\u540c\u65f6\u8fd0\u884c\u7740\u591a\u4e2a\u865a\u62df\u673a\uff0c\u800c\u865a\u62df\u673a\u4f7f\u7528\u4e86\u76f8\u540c\u7684\u64cd\u4f5c\u7cfb\u7edf\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u8fd0\u884c\u7740\u76f8\u540c\u7684\u5927\u578b\u7a0b\u5e8f\uff0c\u5982\u6570\u636e\u5e93\u670d\u52a1\u5668\uff0c\u90ae\u4ef6\u670d\u52a1\u5668\uff0cWeb\u670d\u52a1\u5668\u7b49\u3002\u5728\u8fd0\u884c\u591a\u4e2a\u865a\u62df\u673a\u7684\u73af\u5883\u4e0b\uff0c\u4eba\u4eec\u53d1\u73b0\u865a\u62df\u673a\u4e4b\u95f4\u5b58\u5728\u7740\u5927\u91cf\u7684\u76f8\u540c\u5185\u5b58\u9875\u9762\uff0c\u4f46Linux\u4e3b\u673a\u6ca1\u6709\u529e\u6cd5\u5171\u4eab\u8fd9\u4e9b\u5185\u5b58\u9875\u9762\u3002\u4e3a\u4e86\u89e3\u51b3\u865a\u62df\u673a\u4e4b\u95f4\u5927\u91cf\u91cd\u590d\u5185\u5b58\u7684\u95ee\u9898\uff0cLinux\u793e\u533a\u8bde\u751f\u4e86KSM(Kernel Samepage Merging\uff0c\u5185\u6838\u76f8\u540c\u9875\u9762\u5408\u5e76)\u6280\u672f\u3002KSM\u6280\u672f\u901a\u8fc7\u626b\u63cf\u5185\u5b58\u533a\u57df\uff0c\u627e\u5230\u76f8\u540c\u7684\u5185\u5b58\u9875\u9762\uff0c\u5e76\u628a\u5b83\u4eec\u5408\u5e76\u3002\u8be5\u6280\u672f\u4f7f\u5f97\u8fd0\u884c\u865a\u62df\u673a\u7684\u4e3b\u673a\u4f7f\u7528\u7684\u5185\u5b58\u660e\u663e\u4e0b\u964d\uff0c\u4ece\u800c\u8ba9\u540c\u6837\u7684Linux\u4e3b\u673a\u5728\u4f7f\u7528KSM\u6280\u672f\u540e\u80fd\u8fd0\u884c\u66f4\u591a\u7684\u865a\u62df\u673a\u3002<\/p>\n

KSM\u6280\u672f\u867d\u7136\u662f\u4e3a\u57fa\u4e8eKVM\u6280\u672f\u7684\u865a\u62df\u673a\u8bbe\u8ba1\uff0c\u4f46\u4e5f\u80fd\u8fd0\u7528\u5230\u666e\u901a\u7684\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u3002\u968f\u7740\u8f6f\u786c\u4ef6\u6280\u672f\u7684\u4e0d\u65ad\u8fdb\u6b65\uff0cLinux\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u5360\u7528\u7684\u5185\u5b58\u4e5f\u8d8a\u6765\u8d8a\u591a\u3002\u666e\u901a\u7684Linux\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u4e2d\u5b58\u5728\u591a\u5c11\u91cd\u590d\u9875\u9762\uff0c\u91cd\u590d\u9875\u9762\u7684\u5206\u5e03\u6709\u4e9b\u4ec0\u4e48\u7279\u70b9\uff0c\u628aKSM\u6280\u672f\u8fd0\u7528\u5728\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u4e0a\u5b58\u5728\u4ec0\u4e48\u95ee\u9898\uff0c\u8fd9\u4e9b\u662f\u672c\u8bba\u6587\u5c06\u8981\u63a2\u8ba8\u7684\u5185\u5bb9\u3002\u9488\u5bf9\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\uff0c\u672c\u6587\u5728KSM\u7684\u57fa\u7840\u4e0a\u5f00\u53d1\u4e86KSM+\uff0c\u80fd\u65b9\u4fbf\u6709\u6548\u5730\u5408\u5e76\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\u3002<\/p>\n

1.2 \u56fd\u5185\u5916\u7814\u7a76\u73b0\u72b6<\/h2>\n

\u5bf9\u4e8e\u4f20\u7edf\u7684\u8282\u7ea6\u5185\u5b58\u6280\u672f\uff0c\u5982\u5171\u4eab\u53ea\u8bfb\u4ee3\u7801\u533a\uff0cfork\u7684\u5199\u65f6\u62f7\u8d1d\u6280\u672f\u3002\u8fd9\u4e9b\u6280\u672f\u975e\u5e38\u6210\u719f\uff0c\u73b0\u4ee3\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u5df2\u7ecf\u666e\u901a\u91c7\u7528\u3002<\/p>\n

\u53e6\u5916\uff0c\u6587\u732e[4]\u7814\u7a76\u4e86\u4e00\u79cd\u6bd4\u8f83\u7279\u6b8a\u7684\u8282\u7701\u5185\u5b58\u6280\u672f\u3002\u5b83\u9488\u5bf9\u7684\u662f\u79d1\u5b66\u8ba1\u7b97\u4e2d\u7684\u7279\u6b8a\u7a0b\u5e8f\uff0c\u901a\u8fc7\u7528\u6ce8\u91ca\u9a71\u52a8\u7684\u5de5\u5177\u628a\u6e90\u4ee3\u7801\u8f6c\u8bd1\u5230\u66f4\u9ad8\u6548\u7684\u4ee3\u7801\uff0c\u4e8e\u662f\u7f16\u8bd1\u51fa\u8282\u7701\u5185\u5b58\u7684\u7a0b\u5e8f\u3002<\/p>\n

\u8fd1\u5e74\u6765\u7814\u7a76\u8f83\u591a\u7684\u662f\u57fa\u4e8e\u5408\u5e76\u76f8\u540c\u5185\u5b58\u9875\u9762\u7684\u5185\u5b58\u53bb\u91cd\u6280\u672f\uff1a\u901a\u8fc7\u67e5\u627e\u7cfb\u7edf\u4e2d\u7684\u76f8\u540c\u5185\u5b58\u9875\u9762\uff0c\u628a\u8fd9\u4e9b\u9875\u9762\u5408\u5e76\u4ece\u800c\u8282\u7701\u7cfb\u7edf\u5185\u5b58\u3002\u4f46\u56fd\u5185\u5916\u7684\u7814\u7a76\u57fa\u672c\u96c6\u4e2d\u5728\u8fd0\u884c\u865a\u62df\u673a\u7684\u573a\u666f\u4e2d\u3002\u5982VMware\u516c\u53f8\u8f83\u65e9\u8fdb\u884c\u4e86\u865a\u62df\u673a\u5185\u5b58\u53bb\u91cd\u6280\u672f\u7684\u7814\u7a76\u5de5\u4f5c\uff0c\u6587\u732e[5]\u7814\u7a76\u4e86VMware\u516c\u53f8\u7684Hypervisor(\u865a\u62df\u673a\u7ba1\u7406\u5668)\u4f7f\u7528\u7684\u57fa\u4e8e\u5408\u5e76\u76f8\u540c\u5185\u5bb9\u5185\u5b58\u9875\u9762\u7684\u53bb\u91cd\u6280\u672f\uff0c\u4ee5\u51cf\u5c11\u865a\u62df\u673a\u4e4b\u95f4\u7684\u5185\u5b58\u5197\u4f59\u3002\u6587\u732e[6]\u8be6\u7ec6\u8bba\u8ff0\u4e86\u6b64\u7c7b\u6280\u672f\u5bf9\u4e8e\u57fa\u4e8eXen\u7684\u865a\u62df\u673a\u7684\u5b9e\u73b0\u3002Linux\u793e\u533a\u7684\u7c7b\u4f3c\u6280\u672f\u79f0\u4e4b\u4e3aKSM\u3002\u6587\u732e[7]\u4ee5\u5b9e\u8bc1\u7814\u7a76\u7684\u65b9\u5f0f\u901a\u8fc7\u5927\u91cf\u5b9e\u9a8c\u7814\u7a76\u4e86KSM\u7528\u4e8e\u5408\u5e76\u865a\u62df\u673a\u4e4b\u95f4\u5197\u4f59\u5185\u5b58\u7684\u6027\u80fd\u3002\u6587\u732e[8]\u7814\u7a76\u7684\u662f\u5728\u6570\u636e\u4e2d\u5fc3\u4e2d\u5982\u4f55\u63d0\u9ad8\u5728\u865a\u62df\u673a\u4e4b\u95f4\u5408\u5e76\u76f8\u540c\u5185\u5b58\u7684\u6548\u7387\u3002\u5b83\u5b9e\u73b0\u4e86\u901a\u8fc7\u628a\u865a\u62df\u673a\u5728\u5404\u7269\u7406\u673a\u4e2d\u52a8\u6001\u8fc1\u79fb\u5230\u6700\u9002\u5408\u7684\u4f4d\u7f6e\u4ece\u800c\u63d0\u9ad8\u5408\u5e76\u6548\u7387\u3002\u6587\u732e[9]\u4f7f\u7528KSM\u6280\u672f\u89e3\u51b3\u4e86\u4e3b\u673a\u548c\u865a\u62df\u673a\u90fd\u9700\u8981\u7ef4\u62a4\u81ea\u5df1\u7684\u7f13\u5b58\u7684\u95ee\u9898\uff0c\u63d0\u9ad8\u4e86\u7f13\u5b58\u7684\u6548\u7387\u3002KSM\u6280\u672f\u5e76\u4e0d\u662f\u603b\u80fd\u9ad8\u6548\u5730\u53bb\u9664\u865a\u62df\u673a\u4e4b\u95f4\u7684\u5197\u4f59\u5185\u5b58\uff0c\u4e5f\u5b58\u5728\u4e00\u4e9b\u95ee\u9898\u3002\u5185\u5b58\u5730\u5740\u7684ASLR(Address Space Layout Randomization\uff0c\u7a7a\u95f4\u5e03\u5c40\u968f\u673a\u5316\u6280\u672f)\u662f\u4e3a\u4e86\u63d0\u9ad8\u7a0b\u5e8f\u5b89\u5168\u6027\u7684\u4e00\u79cd\u6280\u672f\u3002\u8be5\u6280\u672f\u63d0\u9ad8\u4e86\u7a0b\u5e8f\u7684\u5b89\u5168\u6027\uff0c\u5374\u5f71\u54cd\u4e86\u9875\u9762\u5bf9\u9f50\uff0c\u4ece\u800c\u5f71\u54cd\u4e86KSM\u7684\u5408\u5e76\u6548\u7387[10]\u3002\u53e6\u5916\uff0cKSM\u7684\u8fd0\u7528\u4e5f\u66b4\u9732\u4e86\u5b89\u5168\u95ee\u9898\u3002\u8fd0\u884c\u5728\u67d0\u53f0\u865a\u62df\u673a\u4e0a\u7684\u7a0b\u5e8f\u53ef\u4ee5\u901a\u8fc7\u6784\u9020\u7279\u5b9a\u7684\u9875\u9762\u5c1d\u8bd5\u8ba9\u4e3b\u673a\u7684KSM\u5408\u5e76\u5b83\uff0c\u518d\u8ba1\u7b97\u5199\u8be5\u9875\u9762\u6240\u7528\u7684\u65f6\u95f4\u3002\u56e0\u4e3a\u5199\u88abKSM\u5408\u5e76\u7684\u9875\u9762\u7684\u65f6\u5019\u4f1a\u53d1\u751f\u5199\u65f6\u62f7\u8d1d\uff0c\u6240\u4ee5\u8fd9\u4e2a\u65f6\u95f4\u4f1a\u6bd4\u6b63\u5e38\u60c5\u51b5\u4e0b\u5ef6\u8fdf\u3002\u901a\u8fc7\u5229\u7528\u8fd9\u4e2a\u65f6\u95f4\u5dee\uff0c\u8fd0\u884c\u5728\u4e00\u53f0\u865a\u62df\u673a\u4e0a\u7684\u7a0b\u5e8f\u53ef\u80fd\u4f1a\u53d1\u73b0\u5176\u5b83\u865a\u62df\u673a\u4e0a\u8fd0\u884c\u7684\u7a0b\u5e8f[11]\uff0c\u751a\u81f3\u8ba9\u865a\u62df\u673a\u4e4b\u95f4\u79d8\u5bc6\u901a\u4fe1[12]\u3002<\/p>\n

KSM\u6280\u672f\u5e94\u7528\u5728\u975e\u865a\u62df\u673a\u7684\u573a\u666f\u4e0b\u7684\u7814\u7a76\u5219\u6bd4\u8f83\u5c11\u3002\u6b27\u6d32\u6838\u5b50\u7814\u7a76\u7ec4\u7ec7(CERN)\u7684\u6838\u5b50\u5b9e\u9a8c\u6a21\u62df\u7a0b\u5e8f\u4ea7\u751f\u6d77\u91cf\u7684\u6570\u636e\uff0c\u5e76\u4e14\u5e76\u884c\u5de5\u4f5c\u7684\u79d1\u5b66\u7a0b\u5e8f\u540c\u65f6\u8f7d\u5165\u8fd9\u4e9b\u6570\u636e\uff0c\u4f7f\u5f97\u5185\u5b58\u4e2d\u6709\u5927\u91cf\u7684\u76f8\u540c\u5185\u5bb9\u9875\u9762\u3002CERN\u901a\u8fc7\u4f7f\u7528\u94a9\u5b50\u6280\u672f\u4fee\u6539C\u8fd0\u884c\u5e93\u7684malloc()\u4ece\u800c\u8fd0\u884cKSM\uff0c\u89e3\u51b3\u4e86\u5185\u5b58\u4e2d\u7684\u5927\u91cf\u91cd\u590d\u9875\u9762\u7684\u95ee\u9898\uff0c\u8282\u7701\u4e868%-48%\u7684\u5185\u5b58[13]\u3002<\/p>\n

\u672c\u8bba\u6587\u5c06\u5728\u4e00\u822c\u684c\u9762\u5e94\u7528\u73af\u5883\u4e0b\u7814\u7a76\u5e76\u589e\u5f3a\u65b0\u7684\u5185\u5b58\u8282\u7701\u6280\u672fKSM\uff0c\u4f7f\u4e4b\u66f4\u9002\u5408\u8fd0\u7528\u5728\u684c\u9762\u5e94\u7528\u73af\u5883\u4e0b\uff0c\u66f4\u6709\u6548\u5730\u51cf\u5c11\u5e94\u7528\u7a0b\u5e8f\u7684\u5185\u5b58\u4f7f\u7528\u91cf\u3002<\/p>\n

1.3 \u7814\u7a76\u610f\u4e49<\/h2>\n

\u5185\u5b58\u8d44\u6e90\u603b\u662f\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u7a00\u7f3a\u7684\u8d44\u6e90\uff0c\u7814\u7a76\u8282\u7701\u5185\u5b58\u7684\u6280\u672f\u5177\u6709\u666e\u904d\u7684\u610f\u4e49\u3002\u53e6\u5916\uff0c\u968f\u7740\u57fa\u4e8eLinux\u5185\u6838\u7684\u64cd\u4f5c\u7cfb\u7edf\u5982Android\u5728\u6d88\u8d39\u7535\u5b50\u7ec8\u7aef\u4e0a\u7684\u8fc5\u901f\u666e\u53ca[14]\uff0c\u4ee5\u53ca\u53ef\u9884\u89c1\u5230\u57fa\u4e8eLinux\u7684Chrome OS\u5728PC\u684c\u9762\u5e02\u573a\u4e5f\u5c06\u5360\u6709\u4e00\u5b9a\u5e02\u573a\uff0c\u800c\u76ee\u524d\u7684\u5e94\u7528\u7a0b\u5e8f\u666e\u904d\u5360\u7528\u8d8a\u6765\u8d8a\u591a\u7684\u5185\u5b58\uff0c\u7814\u7a76Linux\u5e73\u53f0\u4e0b\u65b0\u7684\u8282\u7701\u5185\u5b58\u7684\u6280\u672fKSM\uff0c\u5bf9\u4e8e\u5f00\u53d1Android\u5e73\u53f0\u7b49\u57fa\u4e8eLinux\u5185\u6838\u7684\u5e73\u53f0\u4e0b\u7684\u5546\u7528\u4f18\u5316\u7ba1\u7406\u8f6f\u4ef6\u5177\u6709\u91cd\u8981\u7684\u6280\u672f\u6307\u5bfc\u4f5c\u7528\u3002<\/p>\n

1.4 \u8bba\u6587\u7684\u4e3b\u8981\u5de5\u4f5c<\/h2>\n

      \u672c\u8bba\u6587\u91cd\u70b9\u7814\u7a76\u4e86Linux\u5185\u6838\u7684KSM\u6a21\u5757\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\uff0c\u5e76\u5728\u539f\u6765\u7684\u57fa\u7840\u4e0a\u505a\u4e86\u9488\u5bf9\u684c\u9762\u5e94\u7528\u73af\u5883\u7684\u589e\u5f3a\u4e0e\u6539\u8fdb\uff0c\u540c\u65f6\u8ba4\u771f\u7814\u7a76\u4e86Linux\u5185\u6838\u4ee3\u7801\u7684\u7ec4\u7ec7\u65b9\u5f0f\uff0c\u914d\u7f6e\u4e0e\u7f16\u8bd1\u65b9\u5f0f\uff0c\u5185\u6838\u5f00\u53d1\u53ca\u8c03\u8bd5\u7684\u6280\u672f\uff0c\u4ee5\u53caLinux\u7684\u5185\u5b58\u7ba1\u7406\u5355\u5143\u7684\u5b9e\u73b0\u3002\u589e\u5f3a\u540e\u7684KSM\u547d\u540d\u4e3aKSM+,\u5b83\u6bd4\u539f\u6765\u7684KSM\u66f4\u65b9\u4fbf\u5730\u81ea\u52a8\u91c7\u96c6\u5230\u5e94\u7528\u7a0b\u5e8f\u7684\u76f8\u540c\u5185\u5bb9\u9875\u9762\u5e76\u5408\u5e76\u8fd9\u4e9b\u9875\u9762\uff0c\u4ee5\u8fbe\u5230\u8282\u7701\u5e94\u7528\u7a0b\u5e8f\u6d88\u8017\u7684\u5185\u5b58\u7684\u76ee\u7684\u3002\u8bba\u6587\u7528\u591a\u4e2a\u5b9e\u9a8c\u5c55\u793a\u4e86KSM+\u7684\u529f\u80fd\uff0c\u5e76\u4e0e\u4fee\u6539\u524d\u7684KSM\u505a\u4e86\u6bd4\u8f83\u3002\u6b64\u5916\uff0c\u672c\u8bba\u6587\u8fd8\u7f16\u5199\u4e86\u5185\u6838\u6a21\u5757\u7528\u4e8e\u7edf\u8ba1Linux\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u7279\u70b9\uff0c\u540c\u65f6\u53ef\u4ee5\u7528\u6765\u5e94\u8bc1KSM+\u8fd0\u884c\u7684\u6548\u679c\u3002<\/p>\n

1.5 \u8bba\u6587\u7684\u6574\u4f53\u7ed3\u6784\u5e03\u5c40<\/h2>\n

    \u672c\u8bba\u6587\u7684\u7b2c\u4e8c\u7ae0\u4ecb\u7ecd\u4e86x86\u4f53\u7cfb\u7684\u6bb5\u9875\u5f0f\u5185\u5b58\u7ba1\u7406\u65b9\u5f0f\uff0c\u4ee5\u53caLinux\u7684\u5185\u5b58\u7ba1\u7406\u7684\u5b9e\u73b0\uff0c\u8fd8\u4ecb\u7ecd\u4e86\u7f16\u5199Linux\u5185\u6838\u4ee3\u7801\u7684\u4e00\u4e9b\u57fa\u672c\u7406\u8bba\u3002<\/p>\n

\u7b2c\u4e09\u7ae0\u4ecb\u7ecd\u4e86\u5982\u4f55\u4f7f\u7528KSM\u4ee5\u53caKSM\u7684\u8bbe\u8ba1\u548c\u5b9e\u73b0\u539f\u7406\u3002<\/p>\n

\u7b2c\u56db\u7ae0\u8bb2\u8ff0KSM+\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\u3002KSM+\u662f\u5728KSM\u7684\u57fa\u7840\u4e0a\u7684\u589e\u5f3a\u4e0e\u6539\u8fdb\u3002<\/p>\n

\u7b2c\u4e94\u7ae0\u7528\u591a\u4e2a\u5b9e\u9a8c\u5c55\u793a\u4e86KSM+\u5408\u5e76\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u6548\u679c\uff0c\u5e76\u8bbe\u8ba1\u4e86\u4e00\u4e2a\u5b9e\u9a8c\u6bd4\u8f83\u4e86KSM\u548cKSM+\u7684\u5dee\u522b\u3002\u6700\u540e\u7f16\u5199\u4e86\u7528\u4e8e\u7edf\u8ba1\u5e94\u7528\u7a0b\u5e8f\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u5185\u6838\u6a21\u5757\uff0c\u5e76\u7528\u7edf\u8ba1\u6570\u636e\u5e94\u8bc1\u4e86KSM+\u7684\u5b9e\u9a8c\u7ed3\u679c\u3002\u8fd9\u4e9b\u7edf\u8ba1\u6570\u636e\u53cd\u6620\u4e86Linux\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u4e2d\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u4e00\u4e9b\u57fa\u672c\u7279\u70b9\uff0c\u5bf9\u8fdb\u4e00\u6b65\u6539\u8fdbKSM+\u7684\u7b97\u6cd5\u63d0\u4f9b\u4e86\u4f9d\u636e\u3002<\/p>\n

1.6 \u672c\u7ae0\u5c0f\u7ed3<\/h2>\n

      \u672c\u7ae0\u9996\u5148\u4ecb\u7ecd\u4e86Linux\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u4f20\u7edf\u7684\u8282\u7701\u5185\u5b58\u6280\u672f\uff0c\u7136\u540e\u5f15\u5165\u4e86\u56e0\u4e3a\u865a\u62df\u5316\u5174\u8d77\u800c\u53d1\u5c55\u7684\u65b0\u7684\u5185\u5b58\u8282\u7701\u6280\u672f\uff0c\u5b83\u901a\u8fc7\u5408\u5e76\u5185\u5bb9\u76f8\u540c\u7684\u5185\u5b58\u9875\u9762\u4ece\u800c\u51cf\u5c11\u7cfb\u7edf\u7684\u5185\u5b58\u4f7f\u7528\uff0c\u4e5f\u88ab\u79f0\u4e4b\u4e3a\u5185\u5b58\u53bb\u91cd\u6280\u672f\uff0c\u63a5\u7740\u53d9\u8ff0\u4e86\u56fd\u5185\u5916\u5728\u8be5\u6280\u672f\u65b9\u9762\u7684\u76f8\u5173\u7814\u7a76\u3002\u76ee\u524d\u5bf9\u8be5\u6280\u672f\u7684\u7814\u7a76\u591a\u9488\u5bf9\u865a\u62df\u673a\u73af\u5883\uff0c\u800c\u672c\u8bba\u6587\u5219\u662f\u5728Linux\u684c\u9762\u73af\u5883\u4e2d\u7814\u7a76\u5185\u5b58\u53bb\u91cd\u6280\u672f\u3002<\/p>\n

 <\/p>\n

 <\/p>\n

\u7b2c\u4e8c\u7ae0 \u76f8\u5173\u7406\u8bba\u4e0e\u6280\u672f<\/h1>\n

2.1 \u5185\u5b58\u7ba1\u7406<\/h2>\n

\u5185\u5b58\u7ba1\u7406\u662f\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u4e2d\u6781\u4e3a\u91cd\u8981\u7684\u90e8\u5206\uff0c\u5b83\u6d89\u53ca\u7269\u7406\u5730\u5740\u3001\u865a\u62df\u5730\u5740\u3001\u5206\u6bb5\u3001\u5206\u9875\u7b49\u8bf8\u591a\u6982\u5ff5\u3002<\/p>\n

2.1.1 \u5185\u5b58\u5730\u5740<\/h3>\n

\u7a0b\u5e8f\u4f7f\u7528\u5730\u5740\u6765\u8bbf\u95ee\u5185\u5b58\u5355\u5143\u3002\u5bf9\u4e8ex86\u67b6\u6784\u7684\u4e2d\u592e\u5904\u7406\u5668\uff0c\u4f7f\u7528\u903b\u8f91\u5730\u5740\uff0c\u865a\u62df\u5730\u5740\uff0c\u7269\u7406\u5730\u5740\u4e09\u79cd\u4e0d\u540c\u7684\u5730\u5740[15]\u3002<\/p>\n

\u903b\u8f91\u5730\u5740\u5305\u62ec\u6bb5\u548c\u504f\u79fb\u5730\u5740\u4e24\u90e8\u5206\uff0c\u5b83\u4eec\u5171\u540c\u7528\u6765\u6307\u5b9a\u673a\u5668\u6307\u4ee4\u6216\u8005\u64cd\u4f5c\u6570\u5728\u5185\u5b58\u4e2d\u7684\u4f4d\u7f6e\u3002\u903b\u8f91\u5730\u5740\u5bf9\u5e94\u4e0b\u6587\u63d0\u5230\u7684\u5206\u6bb5\u5f0f\u5185\u5b58\u7ba1\u7406\u3002<\/p>\n

\u865a\u62df\u5730\u5740\u4e5f\u88ab\u79f0\u4f5c\u7ebf\u6027\u5730\u5740\uff0c\u5b83\u8868\u793a\u4e00\u4e2a\u5bfb\u5740\u7a7a\u95f4\u3002\u5728Linux\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0c\u4f7f\u7528\u4e00\u4e2a\u65e0\u7b26\u53f7\u957f\u6574\u578b\u5b58\u50a8\u865a\u62df\u5730\u5740\u3002\u5982\u679c\u662f\u9488\u5bf932\u4f4dx86\u5904\u7406\u5668\u7684\u5185\u6838\uff0c\u8fd9\u662f\u4e00\u4e2a32\u4f4d\u7684\u65e0\u7b26\u53f7\u957f\u6574\u578b\uff0c\u53ef\u4ee5\u5bfb\u5740\u81f3\u591a232\uff0c\u53734GB\u7a7a\u95f4\u3002\u800cLinux\u5728x86_64\u5904\u7406\u5668\u4e0a\uff0c\u4e00\u4e2a\u65e0\u7b26\u53f7\u957f\u6574\u578b\u670964\u4f4d\uff0c\u4f46\u5b9e\u9645\u4e0a\u53ea\u4f7f\u7528\u4e8648\u4f4d\uff0c\u5373\u53ef\u5bfb\u5740\u5230248 \uff0c\u5373256TB\u7684\u5185\u5b58\u7a7a\u95f4\u3002\u5f15\u5165\u865a\u62df\u5730\u5740\u4f7f\u5f97\u7528\u6237\u7a7a\u95f4\u7684\u8fdb\u7a0b\u90fd\u72ec\u81ea\u62e5\u6709\u4e00\u4e2a\u5730\u5740\u7a7a\u95f4\uff0c\u65b9\u4fbf\u64cd\u4f5c\u7cfb\u7edf\u5728\u786c\u4ef6\u7684\u534f\u52a9\u4e0b\u9694\u79bb\u8fdb\u7a0b\u8bbf\u95ee\u5185\u5b58\u7684\u64cd\u4f5c\uff0c\u4ece\u800c\u5b9e\u73b0\u66f4\u9ad8\u7684\u5b89\u5168\u6027\u548c\u4fbf\u6377\u6027\u3002\u572832\u4f4d\u5904\u7406\u5668\u67b6\u6784\u4e0b\uff0c4G\u865a\u62df\u5730\u5740\u7a7a\u95f4\u5212\u5206\u6210\u4e24\u90e8\u5206\uff0c\u9ad8\u7aef\u76841G\u7a7a\u95f4\u88ab\u79f0\u4e4b\u4e3a\u5185\u6838\u7a7a\u95f4\uff0c\u4f4e\u7aef\u76843G\u7a7a\u95f4\u79f0\u4e4b\u4e3a\u7528\u6237\u7a7a\u95f4\u3002\u5185\u6838\u7684\u4ee3\u7801\u548c\u6570\u636e\u5b58\u5728\u5185\u6838\u7a7a\u95f4\uff0c\u7528\u6237\u7a7a\u95f4\u7684\u8fdb\u7a0b\u901a\u8fc7\u7cfb\u7edf\u8c03\u7528\u9677\u5165\u5185\u6838\u7a7a\u95f4\u6267\u884c\u5185\u6838\u7a7a\u95f4\u7684\u4ee3\u7801\u3002\u5bf9\u4e8e64\u4f4d\u5904\u7406\u5668\uff0c\u865a\u62df\u5730\u5740\u540c\u6837\u5206\u4e3a\u5185\u6838\u7a7a\u95f4\u548c\u7528\u6237\u7a7a\u95f4\uff0c\u53ea\u662f\u9488\u5bf964\u4f4d\u5904\u7406\u5668\u7684\u5185\u6838\u62e5\u6709\u5927\u5f97\u591a\u7684\u5bfb\u5740\u8303\u56f4\uff0c\u5bf9\u5185\u6838\u7a7a\u95f4\u548c\u7528\u6237\u7a7a\u95f4\u7684\u5730\u5740\u5212\u5206\u6709\u591a\u79cd\u5b9e\u73b0\u3002<\/p>\n

\u7269\u7406\u5730\u5740\u88ab\u4e2d\u592e\u5904\u7406\u5668\u7528\u6765\u5bfb\u5740\u5185\u5b58\u82af\u7247\u4e0a\u7684\u5b9e\u9645\u7684\u7269\u7406\u5355\u5143\u3002\u5b83\u5bf9\u5e94\u4e86\u9001\u5f80\u5904\u7406\u5668\u7684\u9488\u811a\u4e0a\u7684\u9ad8\u4f4e\u7535\u5e73\u4fe1\u53f7\u3002<\/p>\n

 Linux\u4e2d\u7684\u5185\u5b58\u7ba1\u7406\u5355\u5143 (Memory Management Unit, MMU)\u5728\u786c\u4ef6\u7535\u8def\u7684\u5e2e\u52a9\u4e0b\u628a\u903b\u8f91\u5730\u5740\u8bd1\u6210\u7ebf\u6027\u5730\u5740\uff1b\u800c\u53e6\u4e00\u4e2a\u786c\u4ef6\u7535\u8def\u5219\u5e2e\u52a9\u628a\u7ebf\u6027\u5730\u5740\u7ffb\u8bd1\u6210\u7269\u7406\u5730\u5740\u3002<\/p>\n

2.1.2 \u6bb5\u9875\u5f0f\u5185\u5b58\u7ba1\u7406<\/h3>\n

\u5185\u5b58\u5206\u6bb5\u662f\u753180×86\u5904\u7406\u5668\u5f15\u5165\u7684\u6982\u5ff5\uff0c\u5b83\u9f13\u52b1\u7a0b\u5e8f\u5458\u5728\u8bbe\u8ba1\u7a0b\u5e8f\u65f6\u628a\u7a0b\u5e8f\u4f7f\u7528\u7684\u5185\u5b58\u6309\u7167\u903b\u8f91\u4e0a\u7684\u610f\u4e49\u76f8\u5173\u6027\u5206\u6210\u82e5\u5e72\u4e2a\u90e8\u5206\uff0c\u6bd4\u5982\u6709\u4e9b\u6bb5\u5b58\u653e\u5168\u5c40\u6570\u636e\uff0c\u6709\u4e9b\u6bb5\u5b58\u653e\u7a0b\u5e8f\u4ee3\u7801[16]\u3002<\/p>\n

\u5185\u5b58\u7ba1\u7406\u5355\u5143\u7684\u5206\u9875\u5355\u5143\u534f\u52a9\u628a\u865a\u62df\u5730\u5740\u8bd1\u4e3a\u7269\u7406\u5730\u5740\uff0c\u4e3a\u4e86\u63d0\u9ad8\u7ffb\u8bd1\u7684\u6548\u7387\uff0c\u865a\u62df\u5730\u5740\u88ab\u6309\u7167\u56fa\u5b9a\u957f\u5ea6\u5207\u5206\u6210\u4e00\u4e2a\u4e2a\u5c0f\u5355\u5143\uff0c\u5b83\u4eec\u5219\u88ab\u79f0\u4e4b\u4e3a\u9875\u9762\u3002\u9875\u9762\u53ef\u4ee5\u770b\u6210\u662fMMU\u7ba1\u7406\u5185\u5b58\u7684\u6700\u5c0f\u5355\u4f4d\u3002<\/p>\n

      \u5206\u6bb5\u548c\u5206\u9875\u90fd\u7528\u6765\u5212\u5206\u5185\u5b58\uff0c\u5728\u67d0\u79cd\u7a0b\u5ea6\u4e0a\uff0c\u5b83\u4eec\u7684\u529f\u80fd\u6709\u4e00\u5b9a\u91cd\u5408\u3002\u5b9e\u9645\u4e0a\uff0cLinux\u5185\u6838\u7684\u5185\u5b58\u7ba1\u7406\u673a\u5236\u503e\u5411\u4e8e\u4f7f\u7528\u5206\u9875\u6280\u672f\u3002Linux\u8fdb\u7a0b\u8fd0\u884c\u5728\u7528\u6237\u7a7a\u95f4\u65f6\u4f7f\u7528\u7684\u6807\u5fd7\u4ee3\u7801\u6bb5\u7684\u4ee3\u7801\u6bb5\u9009\u62e9\u5b50(segmentation selector)\u548c\u6570\u636e\u6bb5\u9009\u62e9\u5b50\u662f\u76f8\u7b49\u7684\uff1b\u8fdb\u7a0b\u8fd0\u884c\u5728\u5185\u6838\u7a7a\u95f4\u65f6\u4f7f\u7528\u7684\u4ee3\u7801\u6bb5\u9009\u62e9\u5b50\u548c\u6570\u636e\u6bb5\u9009\u62e9\u5b50\u4e5f\u662f\u76f8\u7b49\u7684\u3002\u800c\u4e14\u8fd9\u56db\u4e2a\u6bb5\u9009\u62e9\u5b50\u7684\u6bb5\u57fa\u5740\u90fd\u8bbe\u7f6e\u4e3a0\u3002\u8fd9\u610f\u5473\u7740\u5728Linux\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0c\u65e0\u8bba\u5bfb\u5740\u6570\u636e\u548c\u8fd8\u662f\u5bfb\u5740\u6307\u4ee4\uff0c\u65e0\u8bba\u5728\u7528\u6237\u7a7a\u95f4\u8fd8\u662f\u5185\u6838\u7a7a\u95f4\uff0c\u903b\u8f91\u5730\u5740\u7684\u6bb5\u57fa\u5740\u90e8\u5206\u4e3a0\uff0c\u504f\u79fb\u5730\u5740\u90e8\u5206\u521a\u597d\u7b49\u4e8e\u865a\u62df\u5730\u5740\u3002<\/p>\n

\u5728Linux\u6240\u652f\u6301\u7684\u5927\u591a\u6570\u786c\u4ef6\u5e73\u53f0\u4e0a\uff0c\u9ed8\u8ba4\u7684\u9875\u9762\u5927\u5c0f\u662f4K\u3002\u4f46Linux\u540c\u65f6\u4e5f\u652f\u6301\u5927\u4e8e4K\u7684\u9875\u9762\u7684\u5185\u5b58\u7ba1\u7406\u3002\u8fd0\u884c\u5728\u7528\u6237\u7a7a\u95f4\u7684\u4ee3\u7801\u53ef\u4ee5\u4f7f\u7528glibc\u5e93\u4e2d\u7684getpagesize()\u51fd\u6570\u5f97\u5230\u5f53\u524d\u4f7f\u7528\u7684\u9875\u9762\u5927\u5c0f\u3002\u672c\u8bba\u6587\u53ea\u9488\u5bf9\u5728x86_64\u67b6\u6784\u4e0a\u9875\u9762\u5927\u5c0f\u662f4K\u7684Linux\u5185\u6838\u3002\u5b9e\u9645\u4e0a\u4ece\u5185\u68382.6.38\u5f00\u59cb\uff0c\u5185\u6838\u4e2d\u5f00\u59cb\u652f\u6301\u900f\u660e\u5de8\u9875(Transparent Huge Page)[17]\uff0c\u5185\u6838\u4e2d\u6709\u4e9b\u9875\u9762\u7684\u5927\u5c0f\u5b9e\u9645\u4e0a\u662f2M\uff0c\u4f46\u8fd9\u4e0d\u5f71\u54cd\u6309\u71674K\u7684\u9875\u9762\u5927\u5c0f\u5c55\u5f00\u8ba8\u8bba\u3002<\/p>\n

Linux\u4f7f\u7528\u5206\u7ea7\u9875\u8868\u7684\u65b9\u5f0f\u628a\u865a\u62df\u5730\u5740\u6620\u5c04\u5230\u9875\u9762\u3002\u572832\u4f4d\u5904\u7406\u5668\u4e0a\u4f7f\u7528\u4e8c\u7ea7\u9875\u8868\uff0c\u5728x86_64\u67b6\u6784\u7684\u5904\u7406\u5668\u4e0a\u5219\u4f7f\u7528\u56db\u7ea7\u9875\u8868\u3002<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe2-1 \u56db\u7ea7\u9875\u8868<\/p>\n

 <\/p>\n

       \u5982\u56fe2-1\u6240\u793a\uff0c\u4ee5\u9488\u5bf9x86_64\u67b6\u6784\u5904\u7406\u5668\u7684Linux\u5185\u6838\u4e3a\u4f8b\uff0c64\u4f4d\u865a\u62df\u5730\u5740\u7684\u9ad816\u4f4d\u4e0d\u88ab\u4f7f\u7528\uff0c\u4f4e48\u4f4d\u88ab\u5e73\u5747\u5206\u4e3a5\u6bb5\uff0coffset\u6bb5\u536012\u4f4d\uff0c\u5176\u5b83\u56db\u4e2a\u6bb5\u5404\u53609\u4f4d\u3002\u8fd9\u4e2a\u5212\u5206\u5728\u6e90\u4ee3\u7801\u6587\u4ef6arch\/x86\/include\/asm\/pgtable_64_types.h\u4e2d\u5b9a\u4e49\u3002cr3\u5bc4\u5b58\u5668\u5b58\u50a8\u4e86\u9875\u5168\u5c40\u76ee\u5f55\u7684\u7269\u7406\u5730\u5740\u3002\u5728\u628a\u865a\u62df\u5730\u5740\u7ffb\u8bd1\u5230\u7269\u7406\u5730\u5740\u7684\u8fc7\u7a0b\u4e2d\uff0cMMU\u5148\u4ececr3\u5bc4\u5b58\u5668\u4e2d\u53d6\u51fa\u5168\u5c40\u76ee\u5f55\u7684\u7269\u7406\u5730\u5740\uff0c\u518d\u52a0\u4e0aGLOBALDIR\u6bb5\u7b97\u51fa\u7684\u504f\u79fb\u91cf\uff0c\u4ece\u800c\u5728\u9875\u5168\u5c40\u76ee\u5f55\u4e2d\u5f97\u5230\u9875\u4e0a\u7ea7\u76ee\u5f55\u7684\u7269\u7406\u5730\u5740\u3002\u4e0e\u6b64\u7c7b\u4f3c\uff0c\u4ece\u9875\u4e0a\u7ea7\u76ee\u5f55\u4e2d\u5f97\u5230\u9875\u4e2d\u95f4\u76ee\u5f55\u7684\u5730\u5740\uff0c\u7136\u540e\u5f97\u5230\u9875\u8868\u7684\u5730\u5740\uff0c\u518d\u5f97\u5230\u9875\u9762\u7684\u5730\u5740\uff0c\u6700\u540e\u7684OFFSET\u5b57\u6bb5\u5219\u5b9a\u4f4d\u5230\u9875\u9762\u4e2d\u7684\u4e00\u4e2a\u5b57\u8282\u3002\u81f3\u6b64\uff0c\u865a\u62df\u5730\u5740\u88ab\u7ffb\u8bd1\u5230\u4e86\u7269\u7406\u5730\u5740\u3002<\/p>\n

\u9875\u5168\u5c40\u76ee\u5f55\uff0c\u9875\u4e0a\u7ea7\u76ee\u5f55\uff0c\u9875\u4e2d\u95f4\u76ee\u5f55\uff0c\u4ee5\u53ca\u9875\u8868\u4e2d\u7684\u6bcf\u4e00\u9879\u90fd\u7531\u76f8\u540c\u7684\u6570\u636e\u7ed3\u6784\u8868\u793a\u3002\u5b83\u8bb0\u8f7d\u4e86\u4e00\u4e9b\u91cd\u8981\u7684\u4fe1\u606f\uff0c\u4e0e\u672c\u8bba\u6587\u76f8\u5173\u7684\u4fe1\u606f\u6709\uff1a\u8be5\u9879\u6307\u5411\u7684\u4e0b\u4e00\u7ea7\u8868\u6216\u8005\u9875\u9762\u662f\u5426\u5b58\u5728\u7684\u6807\u5fd7\uff0c\u5982\u679c\u8bbf\u95ee\u65f6\u4e0d\u5b58\u5728\u5219\u4ea7\u751f\u7f3a\u9875\u4e2d\u65ad\uff0c\u7531do_page_fault\u51fd\u6570\u8d1f\u8d23\u628a\u9875\u9762\u8c03\u5165\u5185\u5b58[18]\uff1b\u4e0b\u4e00\u7ea7\u8868\u6216\u9875\u9762\u7684\u7269\u7406\u5730\u5740\uff1b\u4e0b\u4e00\u7ea7\u8868\u6216\u9875\u9762\u662f\u5426\u53ef\u8bfb\u53ef\u5199\u7684\u6807\u5fd7\uff0c\u5229\u7528\u8be5\u6807\u5fd7\u4f4d\u53ef\u4ee5\u5199\u4fdd\u62a4\u4e00\u4e2a\u9875\u9762\u3002<\/p>\n

Linux\u5185\u6838\u7528\u4e00\u4e2astruct page\u7ed3\u6784\u4f53\u63cf\u8ff0\u4e00\u4e2a\u9875\u9762\u7684\u4fe1\u606f\u3002\u8fd9\u4e2a\u7ed3\u6784\u4f53\u5b9a\u4e49\u5728include\/linux\/mm_types.h\u6587\u4ef6\u4e2d[19]\u3002\u56fe2-2\u5217\u51fa\u8fd9\u4e2a\u7ed3\u6784\u4f53\u4e2d\u4e0e\u672c\u8bba\u6587\u76f4\u63a5\u76f8\u5173\u7684\u5b57\u6bb5\u3002<\/p>\n

<\/p>\n

\u56fe2-2 struct page\u7684\u90e8\u5206\u5b57\u6bb5<\/p>\n

 <\/p>\n

\u5176\u4e2d\u7684flags\u5b57\u6bb5\u5b58\u50a8\u4e86\u9875\u9762\u7684\u72b6\u6001\u4fe1\u606f\uff0c\u4f8b\u5982\uff1a\u8868\u793a\u9875\u9762\u521a\u88ab\u5199\u4e86\u6570\u636e\u7684\u810f\u4f4d\uff1b\u8be5\u9875\u9762\u662f\u5426\u88ab\u9501\u5b9a\u5728\u5185\u5b58\u4e2d\u4e0d\u5145\u8bb8\u7f6e\u6362\u5230\u4ea4\u6362\u5206\u533a\u7684\u6807\u5fd7\u3002_count\u5b57\u6bb5\u548c_mapcount\u5b57\u6bb5\u90fd\u662f\u5f15\u7528\u8ba1\u6570\uff0c\u5b83\u4eec\u7528\u6765\u5171\u540c\u7ef4\u62a4page\u9875\u9762\u7684\u751f\u547d\u671f\u3002_mapcount\u8868\u793a\u4e00\u4e2a\u9875\u9762\u62e5\u6709\u591a\u5c11\u9875\u8868\u9879\u6307\u5411\u5b83\uff0c_count\u88ab\u79f0\u4e3apage\u7684\u4f7f\u7528\u8ba1\u6570\uff0c\u6240\u6709\u7684_mapcount\u8ba1\u6570\u53ea\u76f8\u5f53\u4e8e_count\u8ba1\u6570\u4e2d\u7684\u4e00\u6b21\u8ba1\u6570\u3002\u5982\u679c\u5185\u6838\u4ee3\u7801\u4e2d\u67d0\u6267\u884c\u5e8f\u5217\u5728\u8bbf\u95ee\u67d0\u4e2a\u9875\u9762\u65f6\u9700\u8981\u786e\u4fdd\u8be5\u9875\u9762\u5b58\u5728\uff0c\u5219\u5728\u8bbf\u95ee\u524d\u7ed9_count\u8ba1\u6570\u52a0\u4e00\uff0c\u8bbf\u95ee\u7ed3\u675f\u540e_count\u8ba1\u6570\u51cf\u4e00\u3002\u5f53_count\u8ba1\u6570\u51cf\u5230\u8d1f\u6570\u65f6\u8868\u793a\u6ca1\u6709\u4efb\u4f55\u5185\u6838\u9700\u8981\u4f7f\u7528\u8be5\u9875\u9762\uff0c\u5219\u8868\u793a\u8be5\u9875\u9762\u6ca1\u88ab\u4f7f\u7528\u3002\u5185\u6838\u4ee3\u7801\u4e0d\u5e94\u8be5\u76f4\u63a5\u8bbf\u95ee_count\u8ba1\u6570\uff0c\u800c\u5e94\u8be5\u4f7f\u7528page_count\u51fd\u6570\u3002\u8be5\u51fd\u6570\u7528\u4e00\u4e2astruct page\u7684\u6307\u9488\u505a\u4e3a\u53c2\u6570\uff0c\u5f53\u8be5\u9875\u7a7a\u95f2\u65f6\u51fd\u6570\u8fd4\u56de0\uff0c\u5426\u5219\u8fd4\u56de\u4e00\u4e2a\u6b63\u6570\u8868\u793a\u53c2\u6570\u6307\u5411\u7684\u9875\u9762\u6b63\u88ab\u4f7f\u7528\u3002\u5f53\u9875\u9762\u88ab\u9875\u9ad8\u901f\u7f13\u51b2\u4f7f\u7528\u65f6\uff0cmapping\u57df\u6307\u5411\u4e00\u4e2aaddress_space\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u4e0eLinux\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u6587\u4ef6\u662f\u4e00\u5bf9\u4e00\u6620\u5c04\u7684\u5173\u7cfb\uff0c\u63cf\u8ff0\u4e86\u4e00\u4e2a\u6587\u4ef6\u5206\u914d\u5230\u7684\u7269\u7406\u9875\u9762\u53ca\u76f8\u5173\u6570\u636e\u7ed3\u6784\u3002\u5982\u679c\u9875\u9762\u5e76\u4e0d\u88ab\u9875\u9ad8\u901f\u7f13\u51b2\u4f7f\u7528\u65f6\uff0cmapping\u5219\u6709\u5176\u5b83\u7684\u610f\u4e49\uff0c\u6bd4\u5982mapping\u5b57\u6bb5\u7684\u6700\u4f4e\u4f4d\u8bb0\u8f7d\u8fd9\u662f\u5426\u662f\u4e00\u4e2a\u533f\u540d\u9875\u9762\u3002virtual\u5b57\u6bb5\u662f\u6620\u5c04\u5230\u8be5\u9875\u9762\u7684\u5185\u6838\u7a7a\u95f4\u7684\u865a\u62df\u5730\u5740\uff0c\u5982\u679c\u8be5\u9875\u9762\u662f\u5c5e\u4e8e\u9ad8\u7aef\u5185\u5b58\u533a\u57df\u5219virtual\u5b57\u6bb5\u4e3aNULL\u3002\u5bf9\u4e8ex86_64\u67b6\u6784\u4e0a\u7684Linux\u5185\u6838\uff0c\u5df2\u7ecf\u6ca1\u6709\u9ad8\u7aef\u5185\u5b58\uff0c\u56e0\u6b64\u8be5\u5b57\u6bb5\u4e0d\u4f1a\u4e3aNULL\u3002<\/p>\n

2.1.3 \u5185\u6838\u4e2d\u7684\u5de8\u9875<\/h3>\n

\u73b0\u4ee3\u5904\u7406\u5668\u7684\u5185\u5b58\u7ba1\u7406\u5355\u5143\u51e0\u4e4e\u90fd\u80fd\u5904\u7406\u96644KB\u5927\u5c0f\u5916\u7684\u591a\u79cd\u9875\u9762\u5c3a\u5bf8\u3002\u7136\u800c\uff0cLinux\u5185\u6838\u5728\u51e0\u4e4e\u6240\u4ee5\u5e73\u53f0\u4e0a\u7684\u5b9e\u73b0\u90fd\u9009\u7528\u6700\u5c0f\u7684\u9875\u9762\u5927\u5c0f\uff0c\u53734KB\uff0c\u6bd44KB\u66f4\u5927\u7684\u9875\u9762\uff0c\u90fd\u88ab\u79f0\u4e4b\u4e3a\u5de8\u9875(huge page)\u3002\u5728\u67d0\u4e9b\u5de5\u4f5c\u73af\u5883\u4e0b\uff0c\u5de8\u9875\u53ef\u4ee5\u7ed9\u64cd\u4f5c\u7cfb\u7edf\u5e26\u6765\u6027\u80fd\u4e0a\u7684\u63d0\u9ad8\u3002\u5de8\u9875\u80fd\u63d0\u9ad8\u64cd\u4f5c\u7cfb\u7edf\u7684\u6027\u80fd\u4e3b\u8981\u662f\u56e0\u4e3a\u4e24\u70b9\u3002\u7b2c\u4e00\uff0c\u4f7f\u7528\u5de8\u9875\u53ef\u4ee5\u51cf\u5c11\u53d1\u751f\u9875\u9762\u51fa\u9519\u5904\u7406\u7684\u9891\u7387\uff0c\u56e0\u4e3a\u5728\u6bcf\u6b21\u9875\u9762\u51fa\u9519\u5904\u7406\u65f6\u5185\u6838\u8c03\u5165\u6bd4\u4f7f\u7528\u5c0f\u9875\u9762\u66f4\u591a\u7684\u5185\u5b58\u3002\u7b2c\u4e8c\uff0c\u4f7f\u7528\u5de8\u9875\u51cf\u5c11\u7ffb\u8bd1\u865a\u62df\u5730\u5740\u7684\u65f6\u95f4\u3002\u5728x86_64\u52a0\u6784\u7684\u5904\u7406\u5668\u4e0a\uff0c\u4ece\u865a\u62df\u5730\u5740\u7ffb\u8bd1\u5230\u7269\u7406\u5730\u7406\u9700\u8981\u4f9d\u6b21\u8bbf\u95ee\u56db\u7ea7\u9875\u8868\uff0c\u975e\u5e38\u8017\u65f6\u3002\u800c\u4f7f\u7528\u5de8\u9875\u53ef\u4ee5\u51cf\u5c11\u9875\u8868\u7684\u7ea7\u6570\u3002\u5b9e\u9645\u4e0a\u66f4\u5927\u7684\u6027\u80fd\u63d0\u9ad8\u6e90\u81ea\u4f7f\u7528\u5de8\u9875\u540e\u63d0\u9ad8\u4e86\u65c1\u8def\u8f6c\u6362\u7f13\u51b2\u533a(Translation Lookaside Buffer\uff0cTLB)\u7684\u547d\u4e2d\u6548\u7387[20]\u3002<\/p>\n

\u5728\u5185\u68382.6.38\u7248\u672c\u4e4b\u524d\uff0c\u552f\u4e00\u4f7f\u7528\u5de8\u9875\u7684\u65b9\u5f0f\u662f\u901a\u8fc7\u975e\u5e38\u590d\u6742\u7684hugetlbfs\u6587\u4ef6\u7cfb\u7edf\u3002\u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\u8005\u548c\u7cfb\u7edf\u7ba1\u7406\u5458\u90fd\u9700\u8981\u6ce8\u610f\u4e00\u4e9b\u7279\u522b\u4e8b\u9879\u624d\u80fd\u591f\u5f00\u542f\u5de8\u9875\u529f\u80fd\u3002\u56e0\u6b64\u53ea\u6709\u6781\u5c11\u6570\u771f\u6b63\u9700\u8981\u5de8\u9875\u5e26\u6765\u6027\u80fd\u63d0\u9ad8\u7684\u7528\u6237\uff0c\u5982\u4e13\u7528\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u624d\u4f7f\u7528\u5de8\u9875\u3002<\/p>\n

\u60c5\u51b5\u4ece\u5185\u6838\u7248\u672c2.6.38\u4ee5\u540e\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u4e00\u4e2a\u88ab\u79f0\u4e4b\u4e3a\u900f\u660e\u5de8\u9875\u7684\u529f\u80fd\u88ab\u5408\u5e76\u8fdb\u4e86\u5185\u6838\u4e3b\u5e72\u4ee3\u7801\u3002\u4e4b\u524d\u5185\u6838\u5728VMA\uff08Virtual Memory Area\uff0c\u865a\u62df\u5185\u5b58\u533a\u57df\uff09\u4e2d\u7684\u6240\u6709\u9875\u9762\u5927\u5c0f\u90fd\u662f\u4e00\u6837\u5927\u7684\uff0c\u800c\u52a0\u5165\u900f\u660e\u5de8\u9875\u540e\uff0cVMA\u4e2d\u7684\u9875\u9762\u7684\u5927\u5c0f\u53ef\u80fd\u4e0d\u53ea\u4e00\u79cd\u3002\u900f\u660e\u5de8\u9875\u7684\u5b9e\u73b0\u4ee3\u7801\u6539\u5199\u4e86\u9875\u9762\u51fa\u9519\u5904\u7406\u51fd\u6570\uff0c\u5f53\u4e00\u4e2a\u51fa\u9519\u53d1\u751f\u65f6\uff0c\u5185\u6838\u5c3d\u529b\u5206\u914d\u4e00\u4e2a\u5de8\u9875\uff0c\u5982\u679c\u6210\u529f\u7684\u8bdd\uff0c\u5176\u5b83\u76f8\u5e94\u7684\u5728\u5de8\u9875\u5730\u5740\u8303\u56f4\u5185\u7684\u5c0f\u9875\u9762\u5c31\u4f1a\u88ab\u91ca\u653e\uff0c\u5de8\u9875\u88ab\u63d2\u5165\u5230VMA\u4e2d\u3002\u5982\u679c\u4e0d\u80fd\u5206\u914d\u5230\u4e00\u4e2a\u5de8\u9875\uff0c\u5219\u4ecd\u7136\u6309\u7167\u4ee5\u524d\u7684\u65b9\u5f0f\u5206\u914d\u4e00\u4e2a\u5c0f\u9875\u9762\u3002\u5f53\u5de8\u9875\u9700\u8981\u88ab\u7f6e\u6362\u5230\u4ea4\u6362\u5206\u533a\u65f6\uff0c\u900f\u660e\u5de8\u9875\u673a\u5236\u7b80\u5355\u5730\u628a\u5de8\u9875\u5207\u5272\u6210\u5c0f\u9875\u9762\uff0c\u5176\u5b83\u903b\u8f91\u548c\u5904\u7406\u5c0f\u9875\u9762\u65f6\u4e00\u6837\u3002\u5b9e\u9645\u4e0a\u4e0d\u4ec5\u5728\u7f6e\u6362\u5230\u4ea4\u6362\u5206\u533a\u65f6\u9700\u8981\u5207\u5272\u5de8\u9875\uff0c\u5f88\u591a\u5176\u5b83\u7684\u64cd\u4f5c\uff0c\u5982mprotect()\u548cmlock()\u9875\u9762\u65f6\u4e5f\u9700\u8981\u3002\u672c\u8bba\u6587\u5c06\u8be6\u8ff0\u7684KSM\u5728\u5408\u5e76\u9875\u9762\u65f6\u540c\u6837\u9700\u8981\u628a\u5de8\u9875\u5207\u5272\u6210\u5c0f\u9875\u9762\u3002<\/p>\n

\u900f\u660e\u5de8\u9875\u8fd9\u79cd\u8f7b\u4fbf\u5730\u5229\u7528\u5de8\u9875\u7684\u65b9\u5f0f\u4f7f\u5f97\u5f88\u591a\u5185\u6838\u4ee3\u7801\u5e76\u6ca1\u6709\u611f\u77e5\u5230\u5de8\u9875\u7684\u5b58\u5728\uff0c\u5bf9\u4e8e\u5e94\u7528\u7a0b\u5e8f\u5219\u66f4\u6ca1\u6709\u611f\u77e5\u5230\u5de8\u9875\uff0c\u56e0\u6b64\u88ab\u79f0\u4e4b\u4e3a\u900f\u660e\u5de8\u9875\u3002<\/p>\n

2.1.4 \u5185\u5b58\u63cf\u8ff0\u7b26<\/h3>\n

Linux\u5185\u6838\u4f7f\u7528\u4e00\u4e2a\u53eb\u5185\u5b58\u63cf\u8ff0\u7b26(Memory Descriptor)\u7684\u7ed3\u6784\u4f53\u63cf\u8ff0\u6bcf\u4e00\u4e2a\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4[21]\u3002\u8fd9\u4e2a\u7ed3\u6784\u4f53\u5305\u62ec\u4e86\u6240\u6709\u548c\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4\u76f8\u5173\u7684\u4fe1\u606f\u3002\u5185\u5b58\u63cf\u8ff0\u7b26\u548cstruct page\u4e00\u6837\u5728\u6587\u4ef6include\/linux\/mm_types.h\u4e2d\u5b9a\u4e49\u3002\u56fe2-3\u5217\u51fa\u8fd9\u4e2a\u7ed3\u6784\u4f53\u4e2d\u4e0e\u672c\u8bba\u6587\u76f4\u63a5\u76f8\u5173\u7684\u5b57\u6bb5\u3002<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe2-3 struct mm_struct\u7684\u90e8\u5206\u5b57\u6bb5<\/p>\n

 <\/p>\n

\u5176\u4e2d\uff0cmmap\u5b57\u6bb5\u662f\u7528\u6765\u5b9e\u73b0\u4e00\u4e2a\u94fe\u8868\u3002\u8fd9\u4e2a\u94fe\u8868\u94fe\u63a5\u4e86\u5c5e\u4e8e\u8fd9\u4e2a\u5185\u5b58\u63cf\u8ff0\u7b26\u7684\u6240\u6709vm_area_struct\u7ed3\u6784\u4f53\u3002vm_area_struct\u7ed3\u6784\u4f53\u63cf\u8ff0\u4e86\u4e00\u4e2a\u5185\u5b58\u533a\u57df\u3002\u7531\u4e8e\u5c5e\u4e8e\u4e00\u4e2a\u5185\u5b58\u63cf\u8ff0\u7b26\u7684\u5185\u5b58\u533a\u57df\u53ef\u80fd\u975e\u5e38\u591a\uff0c\u4e3a\u4e86\u52a0\u5feb\u5185\u5b58\u533a\u57df\u7684\u67e5\u627e\u4ee5\u53ca\u6dfb\u52a0\u5220\u9664\u7b49\u64cd\u4f5c\u7684\u901f\u5ea6\uff0c\u5185\u6838\u7528mm_rb\u8868\u793a\u4e00\u68f5\u94fe\u63a5\u4e86\u6240\u6709\u5185\u5b58\u533a\u57df\u7684\u7ea2\u9ed1\u6811\u3002\u7ea2\u9ed1\u6811\u662f\u4e00\u79cd\u4e8c\u53c9\u6811\uff0c\u5b83\u88ab\u5e7f\u6cdb\u5730\u5e94\u7528\u5728Linux\u5185\u6838\u4ee3\u7801\u4e2d\u3002mmap\u548cmm_rb\u662f\u7528\u4e24\u79cd\u4e0d\u540c\u7684\u6570\u636e\u7ed3\u6784\u8868\u793a\u540c\u4e00\u6279\u6570\u636e\u3002mm_users\u548cmm_count\u662f\u5185\u5b58\u63cf\u8ff0\u7b26\u7684\u5f15\u7528\u8ba1\u6570\uff0c\u5b83\u7684\u5b9e\u73b0\u539f\u7406\u548cstruct page\u7684\u5f15\u7528\u8ba1\u6570\u7684\u539f\u7406\u4e00\u6837\u3002\u6bcf\u4e00\u4e2a\u8fdb\u7a0b\u5982\u679c\u62e5\u6709\u4e00\u4e2a\u5185\u5b58\u63cf\u8ff0\u7b26\uff0c\u5219\u4f1a\u589e\u52a0mm_users\u7684\u8ba1\u6570\uff0c\u6240\u6709mm_users\u7684\u8ba1\u6570\u53ea\u76f8\u5f53\u4e8emm_count\u7684\u4e00\u4e2a\u8ba1\u6570\u3002\u6bd4\u5982n\u4e2aLinux\u7ebf\u7a0b\u5171\u4eab\u540c\u4e00\u4e2a\u5185\u5b58\u63cf\u8ff0\u7b26\uff0c\u90a3\u4e48\u5bf9\u5e94\u7684\u5185\u5b58\u63cf\u8ff0\u7b26\u7684mm_users\u8ba1\u6570\u5219\u4e3an\uff0c\u800cmm_count\u5219\u53ef\u80fd\u53ea\u662f1\u3002\u5982\u679c\u6709\u5185\u6838\u6267\u884c\u5e8f\u5217\u60f3\u8981\u8bbf\u95ee\u4e00\u4e2a\u5185\u5b58\u63cf\u8ff0\u7b26\uff0c\u5219\u8be5\u6267\u884c\u5e8f\u5217\u5148\u589e\u52a0mm_count\u7684\u8ba1\u6570\uff0c\u4f7f\u7528\u7ed3\u675f\u540e\u51cf\u5c11mm_count\u7684\u8ba1\u6570\u3002\u4e00\u4f46mm_count\u51cf\u4e3a0\uff0c\u8868\u793a\u8be5\u5185\u5b58\u63cf\u8ff0\u7b26\u6ca1\u6709\u4efb\u4f55\u5f15\u7528\uff0c\u5219\u5b83\u4f1a\u88ab\u5185\u6838\u9500\u6bc1\u3002mmap_sem\u662f\u4e00\u4e2a\u8bfb\u5199\u9501\uff0c\u51e1\u662f\u9700\u8981\u64cd\u4f5c\u5185\u5b58\u63cf\u8ff0\u7b26\u4e2d\u7684\u5185\u5b58\u533a\u57df\u65f6\uff0c\u5219\u9700\u8981\u5148\u5f97\u5230\u76f8\u5e94\u7684\u8bfb\u9501\u6216\u8005\u5199\u9501\uff0c\u4f7f\u7528\u7ed3\u675f\u540e\u91ca\u653e\u8be5\u9501\u3002mm_list\u5b57\u6bb5\u662f\u4e00\u4e2a\u5faa\u73af\u53cc\u94fe\u8868\u3002\u5b83\u94fe\u63a5\u4e86\u7cfb\u7edf\u4e2d\u6240\u6709\u7684\u5185\u5b58\u63cf\u8ff0\u7b26\u3002flags\u5b57\u6bb5\u5b9a\u4e49\u4e86\u5185\u5b58\u63cf\u8ff0\u7b26\u7684\u6807\u5fd7\uff0c\u8fd9\u4e9b\u6807\u5fd7\u6807\u8bb0\u4e86\u5185\u5b58\u63cf\u8ff0\u7b26\u7684\u4e00\u4e9b\u72b6\u6001\u548c\u5c5e\u6027\uff0c\u5185\u6838\u4ee3\u7801\u9700\u8981\u4f7f\u7528\u539f\u5b50\u64cd\u4f5c\u8bbf\u95ee\u8be5\u5b57\u6bb5\u3002<\/p>\n

2.1.5 \u865a\u62df\u5185\u5b58\u533a\u57df<\/h3>\n

\u540c\u6837\u88ab\u5b9a\u4e49\u5728inlude\/linux\/mm_types.h\u4e2d\u7684\u7ed3\u6784\u4f53vm_area_struct\u7528\u6765\u63cf\u8ff0\u4e00\u4e2a\u5185\u5b58\u533a\u57df\u3002\u5728Linux\u5185\u6838\u4e2d\uff0c\u5185\u5b58\u533a\u57df\u7ecf\u5e38\u88ab\u79f0\u4e4b\u4e3a\u865a\u62df\u5185\u5b58\u533a\u57df(Virtual Memory Areas,VMA)\u3002VMA\u63cf\u8ff0\u7684\u5185\u5b58\u533a\u57df\u662f\u4e00\u4e2a\u5730\u5740\u7a7a\u95f4\u4e2d\u7684\u5730\u5740\u8fde\u7eed\u7684\u90e8\u5206\u3002\u800c\u4e14\u8be5\u90e8\u5206\u62e5\u6709\u4e00\u4e9b\u7279\u5b9a\u7684\u5c5e\u6027\uff0c\u6bd4\u5982\u8bbf\u95ee\u6743\u9650\u548c\u76f8\u5173\u8054\u7684\u64cd\u4f5c\u7b49\u3002\u4e0d\u540c\u7684VMA\u53ef\u4ee5\u7528\u6765\u63cf\u8ff0\u4e0d\u540c\u7684\u5185\u5b58\u533a\u57df\u3002\u6bd4\u5982\uff0c\u6620\u5c04\u5230\u5185\u5b58\u7684\u6587\u4ef6\uff0c\u7528\u6237\u7a7a\u95f4\u7684\u6808\uff0c\u7279\u522b\u662f\u672c\u8bba\u6587\u91cd\u70b9\u5173\u6ce8\u7684\u533f\u540d\u5185\u5b58\u533a\u57df(Anonymous VMA)\u3002\u4e0b\u9762\u8ba8\u8bba\u672c\u8bba\u6587\u5173\u5fc3\u7684vm_area_struct\u7684\u4e00\u4e9b\u91cd\u8981\u5b57\u6bb5\uff0c\u8fd9\u4e9b\u5b57\u6bb5\u5982\u56fe2-4\u6240\u793a\u3002<\/p>\n

<\/p>\n

\u56fe2-4 struct vm_area_struct\u7684\u90e8\u5206\u5b57\u6bb5<\/p>\n

 <\/p>\n

vm_mm\u5b57\u6bb5\u6307\u5411\u8be5VMA\u5c5e\u4e8e\u7684\u5185\u5b58\u63cf\u8ff0\u7b26\u3002vm_start\u548cvm_end\u5b57\u6bb5\u8868\u793a\u8be5VMA\u63cf\u8ff0\u7684\u5185\u5b58\u533a\u57df\u7684\u8d77\u59cb\u548c\u7ec8\u70b9\u865a\u62df\u5730\u5740\uff0c\u4f46\u4e0d\u5305\u62ecvm_end\u6307\u5411\u7684\u5730\u5740\uff0c\u5373vm_end\u662f\u865a\u62df\u5185\u5b58\u533a\u57df\u7684\u6700\u540e\u4e00\u4e2a\u6709\u6548\u5b57\u8282\u7684\u540e\u4e00\u4e2a\u5b57\u8282\u3002vm_next\u548cvm_rb\u5206\u522b\u628a\u5185\u5b58\u63cf\u8ff0\u7b26\u62e5\u6709\u7684\u5185\u5b58\u533a\u57df\u7528\u94fe\u8868\uff0c\u548c\u7ea2\u9ed1\u6811\u94fe\u63a5\u8d77\u6765\u3002vm_flags\u8868\u793a\u5185\u5b58\u533a\u57df\u7684\u5c5e\u6027\u3002anon_vma\u4e0e\u5185\u6838\u7684\u9875\u9762\u56de\u6536\u673a\u5236\u56de\u6536\u533f\u540d\u9875\u65f6\u7528\u5230\u7684\u9875\u9762\u53cd\u5c04\u8868\u6709\u5173\u3002vm_file\u662f\u8be5\u5185\u5b58\u533a\u57df\u5bf9\u5e94\u7684\u6587\u4ef6\uff0c\u5982\u679c\u5185\u5b58\u533a\u57df\u662f\u533f\u540d\u7684\uff0c\u5219\u8be5\u5b57\u6bb5\u88ab\u7f6e\u4e3aNULL\u3002<\/p>\n

2.1.6 Slab\u5c42<\/h3>\n

\u9891\u7e41\u5730\u7533\u8bf7\u548c\u56de\u6536\u540c\u4e00\u7c7b\u578b\u7684\u6570\u636e\u7ed3\u6784\u662f\u5185\u6838\u4e2d\u6781\u4e3a\u5e38\u89c1\u7684\u64cd\u4f5c\u3002\u4e3a\u4e86\u63d0\u9ad8\u7533\u8bf7\u548c\u56de\u6536\u67d0\u79cd\u7279\u5b9a\u6570\u636e\u7ed3\u6784\u7684\u6548\u7387\u3002Linux\u5185\u6838\u4e2d\u5f15\u5165\u4e86slab\u5c42\u7684\u6982\u5ff5\uff0c\u901a\u8fc7slab\u5c42\u6765\u7ba1\u7406\u67d0\u79cd\u6570\u636e\u7ed3\u6784\u7684\u9891\u7e41\u7533\u8bf7\u548c\u56de\u6536[22]\u3002<\/p>\n

Slab\u5c42\u628a\u4e0d\u540c\u7684\u6570\u636e\u7ed3\u6784\u5212\u5206\u5230\u4e0d\u540c\u7684\u9ad8\u901f\u7f13\u5b58(cache)\u4e2d\uff0c\u6bcf\u4e2a\u7f13\u5b58\u90fd\u7528\u6765\u7ef4\u62a4\u67d0\u79cd\u6570\u636e\u7ed3\u6784\u7684\u7533\u8bf7\u7684\u56de\u6536\u3002\u6bd4\u5982\uff0c\u4ece\u7ef4\u62a4\u8fdb\u7a0b\u63cf\u8ff0\u7b26\u7684\u7f13\u5b58\u4e2d\u7533\u8bf7\u8fdb\u7a0b\u63cf\u8ff0\u7b26\u65f6\uff0c\u7f13\u5b58\u628a\u4e00\u4e2a\u6807\u8bb0\u4e3a\u53ef\u7528\u7684\u8fdb\u7a0b\u63cf\u8ff0\u7b26\u8fd4\u56de\u7ed9\u8c03\u7528\u8005\uff0c\u540c\u65f6\u628a\u8be5\u63cf\u8ff0\u7b26\u6807\u8bb0\u4e3a\u5df2\u7528\uff1b\u91ca\u653e\u8fdb\u7a0b\u63cf\u8ff0\u7b26\u5219\u4f7f\u5f97\u8fd9\u4e2a\u8fdb\u7a0b\u63cf\u8ff0\u7b26\u5728\u5b58\u653e\u5b83\u7684\u7f13\u5b58\u4e2d\u53c8\u88ab\u6807\u8bb0\u4e3a\u53ef\u7528\u3002<\/p>\n

      \u6bcf\u4e2a\u7f13\u5b58\u88ab\u5212\u5206\u4e3a\u597d\u51e0\u4e2aslab\uff0c\u8fd9\u5c31\u662f\u8fd9\u4e2a\u5b50\u7cfb\u7edf\u88ab\u79f0\u4e4b\u4e3aslab\u5c42\u7684\u539f\u56e0\u3002\u6bcf\u4e2aslab\u662f\u4e00\u9875\u6216\u51e0\u9875\u8fde\u7eed\u7684\u5185\u5b58\u3002\u7f13\u5b58\u7ef4\u62a4\u7684\u67d0\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u79f0\u4e4b\u4e3a\u5bf9\u8c61\uff0c\u5c31\u5168\u90e8\u653e\u5728slab\u4e2d\u3002\u6bcf\u4e2aslab\u5904\u4e8e\u6ee1\uff0c\u90e8\u5206\u6ee1\u6216\u7a7a\u4e09\u79cd\u72b6\u6001\u3002\u5f53slab \u5904\u4e8e\u6ee1\u72b6\u6001\u65f6\uff0c\u8868\u793a\u8be5slab\u4e2d\u7ef4\u62a4\u7684\u5bf9\u8c61\u5df2\u7ecf\u5168\u90e8\u88ab\u5206\u914d\u3002\u5f53slab\u5904\u4e8e\u7a7a\u72b6\u6001\u65f6\uff0c\u548c\u534a\u6ee1\u72b6\u6001\u65f6\uff0cslab\u53ef\u4ee5\u6709\u7a7a\u95f2\u7684\u5bf9\u8c61\u53ef\u4f9b\u5206\u914d\u3002\u5f53\u5185\u6838\u9700\u8981\u7533\u8bf7\u4e00\u4e2a\u65b0\u5bf9\u8c61\u65f6\uff0c\u5c31\u5411\u5bf9\u5e94\u7684\u7f13\u5b58\u7533\u8bf7\u3002\u7f13\u5b58\u627e\u5230\u81ea\u5df1\u7ef4\u62a4\u7684slab\uff0c\u4eceslab\u4e2d\u62ff\u51fa\u9884\u5148\u5206\u914d\u597d\u7684\u7a7a\u95f2\u5bf9\u8c61\u8fd4\u56de\u7ed9\u7533\u8bf7\u8005\u3002\u5f53\u5185\u6838\u4f7f\u7528\u5b8c\u4e86\u8be5\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5c31\u88ab\u7f13\u5b58\u56de\u6536\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u5e76\u4e0d\u771f\u6b63\u91ca\u653e\uff0c\u800c\u662f\u5728\u5bf9\u5e94\u7684slab\u4e0a\u505a\u7a7a\u95f2\u6807\u8bb0\u3002\u7f13\u5b58\u901a\u8fc7\u7075\u6d3b\u7684\u7b56\u7565\u7ef4\u62a4slab\u7684\u5927\u5c0f\u548c\u6570\u91cf\u3002\u4f7f\u7528slab\uff0c\u80fd\u591f\u52a0\u901f\u5e38\u7528\u6570\u636e\u7ed3\u6784\u7684\u5206\u914d\u548c\u91ca\u653e\uff0c\u5e76\u51cf\u5c11\u5206\u914d\u5185\u5b58\u4ea7\u751f\u7684\u788e\u7247\u3002<\/p>\n

2.2 \u5185\u6838\u5f00\u53d1<\/h2>\n

      \u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u7684\u5f00\u53d1\u548c\u666e\u901a\u7528\u6237\u7a7a\u95f4\u7684\u7a0b\u5e8f\u5f00\u53d1\u6709\u975e\u5e38\u5927\u7684\u5dee\u5f02\u3002\u672c\u8282\u5c06\u4ecb\u7ecd\u7406\u89e3KSM\u548c\u5728\u5185\u6838\u7a7a\u95f4\u8fdb\u884c\u5f00\u53d1\u6240\u9700\u719f\u77e5\u7684\u4e00\u4e9b\u5185\u5bb9\u3002<\/p>\n

2.2.1 Linux\u5185\u6838\u7b80\u4ecb<\/h3>\n

Linux\u75311991\u8bde\u751f\u5f00\u59cb\u5c31\u53d7\u5230\u5f00\u6e90\u793e\u533a\u7684\u70ed\u70c8\u6b22\u8fce\uff0c\u5e76\u4e14\u4e00\u76f4\u5904\u4e8e\u6781\u4e3a\u6d3b\u8dc3\u7684\u6301\u7eed\u5f00\u53d1\u72b6\u6001\u3002Linux\u7684\u4ee3\u7801\u4ee5GNU\u8ba1\u5212\u5021\u5bfc\u7684GPL\u534f\u8bae\u81ea\u7531\u5206\u53d1\uff0c\u5168\u4e16\u754c\u7684\u64cd\u4f5c\u7cfb\u7edf\u7231\u597d\u8005\uff0c\u786c\u4ef6\u9a71\u52a8\u7f16\u5199\u8005\u90fd\u975e\u5e38\u6d3b\u8dc3\u5730\u4e3aLinux\u8d21\u732e\u4ee3\u7801\u3002Linux\u7684\u5f00\u53d1\u5982\u6b64\u6210\u529f\uff0c\u4ee5\u81f3GNU\u8ba1\u5212\u4e2d\u81ea\u5df1\u7684\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838GNU Hurd\u90fd\u672a\u5f97\u5230\u8db3\u591f\u591a\u7684\u5173\u6ce8\uff0cLinux\u6210\u4e3a\u4e8b\u5b9e\u4e0aGNU\u8ba1\u5212\u7684\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u3002<\/p>\n

Linux\u5185\u6838\u6cbf\u7528Unix\u7684\u5355\u5185\u6838\u8bbe\u8ba1\u3002\u5355\u5185\u6838\u8bbe\u8ba1\u628a\u6574\u4e2a\u5185\u6838\u8bbe\u8ba1\u6210\u8fd0\u884c\u5728\u540c\u4e00\u4e2a\u5730\u5740\u7a7a\u95f4\u7684\u4e00\u4e2a“\u5927”\u8fdb\u7a0b\u3002\u6240\u6709\u7684\u5185\u6838\u6267\u884c\u5e8f\u5217\u5b58\u5728\u4e8e\u540c\u4e00\u4e2a\u5730\u5740\u7a7a\u95f4\u4e2d\uff0c\u5e76\u5728\u540c\u4e00\u4e2a\u5730\u5740\u7a7a\u95f4\u5185\u8fd0\u884c\u3002\u56e0\u6b64\uff0c\u5185\u6838\u7684\u4e0d\u540c\u6267\u884c\u5e8f\u5217\u4e4b\u95f4\u7684\u901a\u4fe1\u662f\u6781\u4e3a\u5feb\u901f\u7684\uff0c\u57fa\u672c\u4e0d\u9700\u8981\u989d\u5916\u7684\u5f00\u9500\uff0c\u4f46\u7531\u6b64\u4e5f\u5e26\u6765\u5185\u6838\u4ee3\u7801\u7684\u590d\u6742\u5ea6\u8fc7\u9ad8\u7684\u95ee\u9898\u3002\u8f83\u4e4b\u5355\u5185\u6838\uff0c\u53e6\u4e00\u4e2a\u8bbe\u8ba1\u64cd\u4f5c\u7cfb\u7edf\u7684\u601d\u8def\u662f\u5fae\u5185\u6838\uff0c\u5b83\u7684\u5f88\u591a\u8bbe\u8ba1\u7406\u5ff5\u548c\u5355\u5185\u6838\u7684\u8bbe\u8ba1\u76f8\u53cd\uff0c\u5982windows XP, Vista \u8fd8\u6709 windows 7\u7b49\u7b49\u3002Linux\u5185\u6838\u5728\u53d1\u5c55\u8fc7\u7a0b\u4e2d\u5f15\u5165\u4e86\u5185\u6838\u6a21\u5757\u7684\u6982\u5ff5\uff0c\u8fd9\u4f7f\u5f97Linux\u5185\u6838\u65e2\u4fdd\u6301\u4e86\u5355\u5185\u6838\u8bbe\u8ba1\u6027\u80fd\u5feb\u901f\u7684\u7279\u70b9\uff0c\u53c8\u4f7f\u5f97\u5185\u6838\u4ee3\u7801\u76f8\u5bf9\u7eaf\u7cb9\u7684\u5355\u5185\u6838\u7b80\u6d01\u548c\u6613\u4e8e\u7ef4\u62a4\u3002<\/p>\n

\u672c\u8bba\u6587\u9009\u5b9a\u7684\u5185\u6838\u7248\u672c\u662f2013\u5e742\u6708\u53d1\u5e03\u76843.0.66\u7a33\u5b9a\u7248\uff0c\u5728\u5b83\u7684\u57fa\u7840\u4e0a\u7814\u7a76\u5f00\u53d1\u3002<\/p>\n

2.2.2 \u5185\u6838\u7ebf\u7a0b<\/h3>\n

Linux\u7684\u5185\u6838\u7ebf\u7a0b\u5b9e\u9645\u4e0a\u662f\u53ea\u5b58\u5728\u4e8e\u5185\u6838\u7a7a\u95f4\u7684\u4e00\u4e2a\u8fdb\u7a0b\u3002\u5185\u6838\u901a\u5e38\u521b\u5efa\u5185\u6838\u7ebf\u7a0b\u8ba9\u5b83\u5728\u540e\u53f0\u5468\u671f\u6027\u7684\u5904\u7406\u4e00\u4e9b\u4e8b\u52a1\u3002\u5185\u6838\u7ebf\u7a0b\u548c\u666e\u901a\u8fdb\u7a0b\u4e00\u6837\u53ef\u8c03\u5ea6\uff0c\u53ef\u88ab\u62a2\u5148\u3002\u4ed6\u4eec\u7684\u6700\u663e\u8457\u7684\u533a\u522b\u662f\u5185\u6838\u7ebf\u7a0b\u7684\u8fdb\u7a0b\u63cf\u8ff0\u7ed3\u6784\u4f53task_struct\u7684mm\u5b57\u6bb5\u4e3aNULL\u3002\u800c\u4e00\u822c\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u63cf\u8ff0\u7ed3\u6784\u4f53\u7684mm\u5b57\u6bb5\u6307\u5411\u8be5\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u3002\u56e0\u4e3a\u5185\u6838\u7ebf\u7a0b\u6c38\u8fdc\u53ea\u8fd0\u884c\u5728\u5185\u6838\u6001\uff0c\u6c38\u8fdc\u4e0d\u5fc5\u5207\u6362\u81f3\u7528\u6237\u7a7a\u95f4\uff0c\u5e76\u4e14\u6240\u6709\u7528\u6237\u6001\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u7684\u5185\u6838\u865a\u62df\u5730\u5740\u90e8\u5206\u90fd\u662f\u4e00\u6837\u7684\uff0c\u6240\u4ee5\u5f53\u5904\u7406\u5668\u8c03\u5ea6\u5230\u5185\u6838\u8fdb\u7a0b\u65f6\uff0c\u5185\u6838\u8fdb\u7a0b\u53ef\u4ee5\u968f\u4fbf\u4f7f\u7528\u67d0\u4e2a\u7528\u6237\u6001\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u7684\u5185\u6838\u865a\u62df\u5730\u5740\u90e8\u5206\u3002Linux\u5185\u6838\u7ebf\u7a0b\u7684\u4f5c\u6cd5\u662f\u501f\u7528\u4e0a\u4e00\u4e2a\u666e\u901a\u7528\u6237\u6001\u8fdb\u7a0b\u7684\u7528\u6237\u7a7a\u95f4[23]\u3002<\/p>\n

\u5185\u6838\u7ebf\u7a0b\u7531\u5185\u6838API\u51fd\u6570kthread_create()\u521b\u5efa\uff0c\u4e5f\u53ef\u7531kthread_run()\u521b\u5efa\u3002\u4ed6\u4eec\u7684\u533a\u522b\u662f\u524d\u8005\u521b\u5efa\u7684\u662f\u4e00\u4e2a\u5904\u4e8e\u975e\u8fd0\u884c\u72b6\u6001\u7684\u5185\u6838\u7ebf\u7a0b\uff0c\u9700\u8981\u4f7f\u7528wake_up_process()\u628a\u5b83\u8f6c\u6362\u4e3a\u53ef\u8fd0\u884c\u72b6\u6001\uff1b\u800ckthread_run()\u521b\u5efa\u7684\u5185\u6838\u7ebf\u7a0b\u7acb\u5373\u5904\u4e8e\u53ef\u8fd0\u884c\u72b6\u6001\uff0c\u968f\u65f6\u53ef\u80fd\u88ab\u8c03\u5ea6\u800c\u83b7\u5f97\u8fd0\u884c\u7684\u673a\u4f1a\u3002\u5185\u6838\u7ebf\u7a0b\u5f00\u59cb\u540e\u4f1a\u4e00\u76f4\u8fd0\u884c\uff0c\u76f4\u5230\u5b83\u663e\u5f0f\u5730\u8c03\u7528do_exit()\u6216\u8005\u5176\u5b83\u5185\u6838\u4ee3\u7801\u8c03\u7528kthread_stop()\u3002kthread_stop()\u51fd\u6570\u9700\u8981\u4f20\u5165\u5148\u524d\u521b\u5efa\u5185\u6838\u7ebf\u7a0b\u51fd\u6570\u8fd4\u56de\u7684task_struct\u4f5c\u4e3a\u53c2\u6570\u3002\u8be5\u51fd\u6570\u5728\u8c03\u7528\u540e\u4f1a\u4e00\u76f4\u963b\u585e\uff0c\u76f4\u5230\u7b49\u5f85\u7684\u5185\u6838\u7ebf\u7a0b\u5b8c\u5168\u9000\u51fa\u4e86\u624d\u8fd4\u56de\u3002<\/p>\n

2.2.3 \u5185\u6838\u7684\u540c\u6b65\u673a\u5236<\/h3>\n

\u7ade\u4e89\u6761\u4ef6\u6307\u7684\u662f\u7a0b\u5e8f\u8bbe\u8ba1\u4e2d\u7684\u4e00\u79cd\u7f3a\u9677\uff0c\u8fd9\u79cd\u7f3a\u9677\u4f7f\u5f97\u7a0b\u5e8f\u7684\u8f93\u51fa\u4f1a\u56e0\u4e3a\u4e0d\u53d7\u63a7\u5236\u7684\u4e8b\u4ef6\u51fa\u73b0\u7684\u987a\u5e8f\u6216\u53d1\u751f\u65f6\u95f4\u800c\u53d1\u751f\u6539\u53d8\u3002Linux\u5185\u6838\u63d0\u4f9b\u4e86\u4e00\u5957\u540c\u6b65\u65b9\u6cd5\uff0c\u6b63\u786e\u5730\u4f7f\u7528\u540c\u6b65\u65b9\u6cd5\u53ef\u4ee5\u6d88\u9664\u7ade\u4e89\u6761\u4ef6[24]\u3002<\/p>\n

atomic_t\u662f\u5185\u6838\u4e2d\u7684\u7279\u6b8a\u6574\u578b\u6570\uff0c\u5e94\u7528\u5728\u8be5\u6574\u578b\u6570\u4e0a\u7684\u65b9\u6cd5\u4f7f\u5f97\u5bf9\u8be5\u6574\u6570\u7684\u64cd\u4f5c\u662f\u539f\u5b50\u64cd\u4f5c\uff0c\u4ece\u800c\u5bf9\u8be5\u6574\u6570\u7684\u64cd\u4f5c\u4e0d\u4f1a\u88ab\u5176\u5b83\u6267\u884c\u5e8f\u5217\u4e2d\u65ad\u3002\u5982atomic_inc()\u548catomic_dec()\u5206\u522b\u662f\u539f\u5b50\u5730\u7ed9\u4e00\u4e2a\u6574\u578b\u6570\u52a0\u4e00\u6216\u51cf\u4e00\u3002<\/p>\n

Linux\u5185\u6838\u4e2d\u6700\u5e38\u7528\u7684\u9501\u662f\u81ea\u65cb\u9501\u3002\u5bf9\u4e8e\u4e00\u4e2a\u81ea\u65cb\u9501\uff0c\u5185\u6838\u5728\u4efb\u4f55\u65f6\u5019\u53ea\u80fd\u6709\u4e00\u4e2a\u6267\u884c\u5e8f\u5217\u6301\u6709\u8be5\u9501\u3002\u5982\u679c\u5728\u8be5\u81ea\u65cb\u9501\u88ab\u5176\u5b83\u6267\u884c\u5e8f\u5217\u6301\u6709\u65f6\uff0c\u5f53\u524d\u6267\u884c\u5e8f\u5217\u4e5f\u7533\u8bf7\u6301\u6709\u8be5\u9501\uff0c\u5219\u8fd9\u4e2a\u6267\u884c\u5e8f\u5217\u5c31\u4f1a\u4f7f\u5f97\u5904\u7406\u5668\u4e00\u76f4\u5fd9\u7b49\u8be5\u9501\u88ab\u6301\u6709\u8005\u91ca\u653e\u3002\u4e3a\u9075\u5faa\u8fc5\u901f\u5360\u6709\uff0c\u8fc5\u901f\u91ca\u653e\u7684\u539f\u5219\uff0c\u4e00\u4e2a\u5185\u6838\u6267\u884c\u5e8f\u5217\u4e00\u4f46\u6301\u6709\u67d0\u81ea\u65cb\u9501\uff0c\u5219\u5185\u6838\u5728\u8be5\u5185\u6838\u5e8f\u5217\u8fd0\u884c\u7684\u5f53\u524d\u5904\u7406\u5668\u4e0a\u88ab\u7981\u6b62\u62a2\u5148\u3002\u53e6\u5916\uff0c\u6301\u6709\u81ea\u65cb\u9501\u7684\u5185\u6838\u6267\u884c\u5e8f\u5217\u5e94\u8be5\u8fd0\u884c\u5b8c\u7b80\u77ed\u7684\u4ee3\u7801\u540e\u8fc5\u901f\u91ca\u653e\u8be5\u81ea\u65cb\u9501\uff0c\u800c\u4e0d\u5e94\u8be5\u5728\u91ca\u653e\u6301\u6709\u7684\u81ea\u65cb\u9501\u524d\u6267\u884c\u53ef\u80fd\u9020\u6210\u7761\u7720\u7684\u4ee3\u7801\uff0c\u4e5f\u4e0d\u80fd\u663e\u5f0f\u5730\u8c03\u7528\u653e\u5f03\u5904\u7406\u5668\u800c\u7533\u8bf7\u8c03\u5ea6\u5176\u5b83\u8fdb\u7a0b\u7684\u4ee3\u7801\uff0c\u56e0\u4e3a\u8fd9\u6837\u4f1a\u4f7f\u5f97\u5176\u5b83\u7533\u8bf7\u8be5\u81ea\u65cb\u9501\u7684\u6267\u884c\u5e8f\u5217\u7b49\u5f85\u975e\u5e38\u957f\u7684\u65f6\u95f4\u800c\u5927\u5927\u635f\u5bb3\u4e86\u6574\u4e2a\u7cfb\u7edf\u7684\u6027\u80fd\u3002\u81ea\u65cb\u9501\u7684\u57fa\u672c\u6709\u6cd5\u662f\uff1a\u7528DEFINE_SPINLOCK\u5728\u7f16\u8bd1\u671f\u5b9a\u4e49\u4e00\u4e2a\u672a\u88ab\u5360\u7528\u7684\u81ea\u65cb\u9501\u53d8\u91cf\uff0c\u7528\u51fd\u6570spin_lock()\u5f97\u5230\u81ea\u65cb\u9501\uff0c\u7528spin_unlock()\u51fd\u6570\u91ca\u653e\u81ea\u65cb\u9501\u3002\u4e0e\u666e\u901a\u81ea\u65cb\u9501\u7c7b\u4f3c\u7684\u8fd8\u6709\u8bfb\u5199\u81ea\u65cb\u9501\u3002\u5f53\u5bf9\u81ea\u65cb\u9501\u4fdd\u62a4\u7684\u8d44\u6e90\u7684\u8bbf\u95ee\u591a\u6570\u662f\u8bfb\u8bbf\u95ee\uff0c\u5c11\u90e8\u5206\u662f\u5199\u8bbf\u95ee\u65f6\uff0c\u4f7f\u7528\u8bfb\u5199\u81ea\u65cb\u9501\u6bd4\u4f7f\u7528\u666e\u901a\u81ea\u65cb\u9501\u7684\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n

Linux\u5185\u6838\u4e2d\u53e6\u4e00\u79cd\u5e38\u89c1\u7684\u9501\u662f\u4fe1\u53f7\u91cf\u3002\u4fe1\u53f7\u91cf\u53ea\u80fd\u5728\u8fdb\u7a0b\u4e0a\u4e0b\u6587\u4e2d\u624d\u80fd\u4f7f\u7528\uff0c\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u6216\u5185\u6838\u7ebf\u7a0b\u5c1d\u8bd5\u83b7\u53d6\u4e00\u4e2a\u4e0d\u53ef\u7528\u7684\u4fe1\u53f7\u91cf\u65f6\uff0c\u8be5\u8fdb\u7a0b\u6216\u8005\u8be5\u5185\u6838\u7ebf\u7a0b\u4f1a\u88ab\u7f6e\u4e8e\u4e00\u4e2a\u7b49\u5f85\u961f\u5217\u4e2d\uff0c\u7136\u540e\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u5904\u7406\u5668\u8f6c\u800c\u6267\u884c\u5176\u5b83\u7684\u4ee3\u7801\u3002\u5f53\u8be5\u4fe1\u53f7\u91cf\u88ab\u67d0\u6301\u6709\u8005\u91ca\u653e\uff0c\u4fe1\u53f7\u91cf\u53d8\u4e3a\u53ef\u7528\u65f6\uff0c\u7b49\u5f85\u961f\u961f\u4e2d\u7684\u4e00\u4e2a\u8fdb\u7a0b\u6216\u5185\u6838\u7ebf\u7a0b\u4f1a\u88ab\u5524\u9192\u800c\u83b7\u5f97\u8be5\u4fe1\u53f7\u91cf\u3002\u56e0\u4e3a\u672a\u80fd\u7acb\u5373\u83b7\u5f97\u9501\u65f6\u4f1a\u4f7f\u5f97\u6267\u884c\u5e8f\u5217\u8fdb\u5165\u7761\u7720\uff0c\u6240\u4ee5\u5728\u4e0d\u80fd\u88ab\u8c03\u5ea6\u7684\u4e2d\u65ad\u4e0a\u4e0b\u6587\u4e2d\u4e0d\u80fd\u4f7f\u7528\u4fe1\u53f7\u91cf\u3002\u540c\u6837\u56e0\u4e3a\u672a\u80fd\u7acb\u5373\u83b7\u5f97\u4fe1\u53f7\u91cf\u5219\u88ab\u7f6e\u4e8e\u7761\u7720\u72b6\u6001\u7684\u539f\u56e0\uff0c\u4fe1\u53f7\u91cf\u975e\u5e38\u9002\u5408\u9700\u8981\u957f\u65f6\u95f4\u6301\u6709\u9501\u7684\u60c5\u51b5\u3002\u4fe1\u53f7\u91cf\u7684\u53e6\u4e00\u4e2a\u663e\u8457\u7684\u7279\u70b9\u662f\u5b83\u5145\u8bb8\u540c\u65f6\u6709\u82e5\u5e72\u4e2a\u6301\u6709\u8005\uff0c\u8fd9\u4e2a\u6570\u91cf\u5728\u58f0\u660e\u4fe1\u53f7\u91cf\u65f6\u6307\u70b9\u3002\u4f46\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u4fe1\u53f7\u91cf\u88ab\u8bbe\u7f6e\u4e3a\u53ea\u80fd\u6709\u4e00\u4e2a\u6301\u6709\u8005\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4fe1\u53f7\u91cf\u88ab\u79f0\u4e3a\u4e8c\u503c\u4fe1\u53f7\u91cf\u6216\u8005\u4e92\u65a5\u9501\u3002\u4e92\u65a5\u9501\u5e38\u89c1\u7684\u4f7f\u7528\u65b9\u6cd5\u662f\uff1a\u7528DECLARE_MUTEX\u5b8f\u5728\u7f16\u8bd1\u671f\u5b9a\u4e49\u4e00\u4e2a\u672a\u88ab\u5360\u7528\u7684\u4e92\u65a5\u9501\u53d8\u91cf\uff0c\u6216\u8005\u7528init_MUTEX\u5728\u8fd0\u884c\u65f6\u521d\u59cb\u5316\u4e92\u65a5\u9501\uff0c\u7528down()\u51fd\u6570\u83b7\u5f97\u4fe1\u53f7\u91cf\uff0c\u7528up()\u51fd\u6570\u91ca\u653e\u4fe1\u53f7\u91cf\u3002\u4e0e\u8bfb\u5199\u81ea\u65cb\u9501\u7c7b\u4f3c\uff0cLinux\u5185\u6838\u4e5f\u6709\u9488\u5bf9\u8bfb\u591a\u5199\u5c11\u7684\u60c5\u51b5\u505a\u4f18\u5316\u7684\u8bfb\u5199\u4fe1\u53f7\u91cf\uff0c\u5b83\u7684\u7279\u5f81\u548c\u666e\u901a\u4fe1\u53f7\u91cf\u57fa\u672c\u76f8\u540c\u3002<\/p>\n

2.2.4 \u5185\u6838\u7684\u8c03\u8bd5\u6280\u672f<\/h3>\n

\u8c03\u8bd5\u5185\u6838\u4ee3\u7801\u662f\u5185\u6838\u5f00\u53d1\u6280\u672f\u4e2d\u975e\u5e38\u56f0\u96be\u7684\u4e00\u90e8\u5206\uff0c\u8fd9\u662f\u56e0\u4e3a\u5185\u6838\u4ee3\u7801\u8fd0\u884c\u5728\u8f6f\u4ef6\u6808\u7684\u6700\u5e95\u5c42\uff0c\u4e0d\u50cf\u7528\u6237\u7a7a\u95f4\u7684\u8fdb\u7a0b\u53ef\u4ee5\u8f7b\u6613\u5730\u88ab\u8c03\u8bd5\u5668\u8ddf\u8e2a\u3002\u53e6\u5916\uff0c\u56e0\u4e3a\u5f88\u591a\u60c5\u51b5\u4e0b\u7684\u5185\u6838\u9519\u8bef\u4f1a\u8ba9\u6574\u4e2a\u64cd\u4f5c\u7cfb\u7edf\u5d29\u6e83\u6216\u8005\u8fd0\u884c\u5728\u4e0d\u53ef\u9884\u6d4b\u7684\u4e0d\u7a33\u5b9a\u72b6\u6001\uff0c\u8ba9\u5f00\u53d1\u8005\u51e0\u4e4e\u6ca1\u6709\u673a\u4f1a\u6536\u96c6\u5230\u8db3\u591f\u591a\u7684\u9519\u8bef\u662f\u5982\u4f55\u51fa\u73b0\u7684\u7ebf\u7d22\uff0c\u6240\u4ee5\u5185\u6838\u9519\u8bef\u5728\u5f88\u591a\u60c5\u51b5\u4e0b\u4e5f\u4e0d\u80fd\u8f7b\u6613\u5730\u88ab\u91cd\u73b0\u3002<\/p>\n

       \u7528printk()\u51fd\u6570\u6253\u5370\u51fa\u7a0b\u5e8f\u7684\u76f8\u5173\u4fe1\u606f\u5230\u65e5\u5fd7\u6587\u4ef6\u6216\u63a7\u5236\u53f0\u662f\u6700\u53e4\u8001\u4e5f\u6700\u5e38\u7528\u4e14\u6709\u6548\u7684\u8c03\u8bd5\u65b9\u6cd5[25]\u3002printk()\u51fd\u6570\u4e0e\u7528\u6237\u7a7a\u95f4\u7684printf()\u5e93\u51fd\u6570\u76f8\u4f3c\uff0c\u5176\u4e2d\u7684\u5dee\u522b\u4e4b\u4e00\u662fprintk()\u51fd\u6570\u53ef\u4ee5\u8ba9\u7528\u6237\u6307\u5b9a\u6253\u5370\u4fe1\u606f\u7684\u7ea7\u522b\u3002\u76ee\u524dprintk()\u51fd\u6570\u6709\u516b\u4e2a\u4fe1\u606f\u7ea7\u522b\uff0c\u5b83\u4eec\u88ab\u5b9a\u4e49\u5728linux\/kernel.h\u5934\u6587\u4ef6\u4e2d\u3002\u7ea7\u522b\u7684\u6570\u5b57\u8d8a\u5c0f\u5219\u8868\u793a\u7ea7\u522b\u8d8a\u9ad8\u3002\u57fa\u4e8e\u4fe1\u606f\u7ea7\u522b\uff0c\u5185\u6838\u53ef\u80fd\u628a\u4fe1\u606f\u6253\u5370\u5230\u5f53\u524d\u7684\u63a7\u5236\u53f0\u3002\u5b83\u53ef\u80fd\u662f\u4e00\u4e2a\u5b57\u7b26\u7ec8\u7aef\uff0c\u53ef\u80fd\u662f\u4e00\u4e2a\u4e32\u53e3\u8fde\u63a5\u7684\u8bbe\u5907\uff0c\u4e5f\u53ef\u80fd\u662f\u4e00\u4e2a\u5e76\u53e3\u6253\u5370\u673a\u3002\u5185\u6838\u4e2d\u7684\u6574\u578b\u53d8\u91cfconsole_loglevel\u8868\u793a\u80fd\u88ab\u53d1\u5f80\u63a7\u5236\u53f0\u7684\u4fe1\u606f\u7684\u6700\u5c0f\u7ea7\u522b\u3002\u53ef\u4ee5\u7528sys_syslog\u7cfb\u7edf\u8c03\u7528\u6539\u53d8\u5b83\u7684\u503c\uff0c\u7528\u53ef\u4ee5\u901a\u8fc7\u5199\u6587\u4ef6\/proc\/sys\/kernel\/printk\u6539\u53d8\u5b83\u3002\u6240\u6709\u4fe1\u606f\uff0c\u5305\u62ec\u4fe1\u606f\u7ea7\u522b\u7684\u503c\u5927\u4e8econsole_loglevel\u800c\u6ca1\u80fd\u88ab\u53d1\u5f80\u63a7\u5236\u53f0\u7684\u4fe1\u606f\u90fd\u88ab\u6dfb\u52a0\u5230\u6587\u4ef6\/var\/log\/messages\u7684\u672b\u5c3e\u3002<\/p>\n

\u9664\u4e86\u6700\u4e3a\u5e38\u7528\u7684\u6253\u5370\u51fd\u6570printk()\u662f\u8c03\u8bd5\u5185\u6838\u5fc5\u5907\u4e4b\u5916\u3002\u5185\u6838\u5f00\u53d1\u8005\u4f7f\u7528\u7684\u5185\u6838\u5728\u7f16\u8bd1\u524d\u901a\u5e38\u90fd\u4f1a\u6253\u5f00\u4e00\u4e9b\u65b9\u4fbf\u8c03\u8bd5\u7684\u5185\u6838\u9009\u9879[26]\u3002\u6bd4\u5982CONFIG_KALLSYMS\u9009\u9879\u4f7f\u5f97\u5185\u6838\u4ee3\u7801\u7684\u7b26\u53f7\u4fe1\u606f\u88ab\u7f16\u8bd1\u8fdb\u5185\u6838\uff0c\u8fd9\u6837\u5f53\u5185\u6838\u5d29\u6e83\u65f6\uff0c\u7cfb\u7edf\u4f1a\u7528\u7b26\u53f7\u6253\u5370\u51fa\u51fa\u9519\u65f6\u6808\u56de\u6eaf\u4fe1\u606f\uff0c\u5426\u5219\u53ea\u6709\u4e8c\u8fdb\u5236\u7684\u5730\u5740\u4fe1\u606f\u3002\u8fd8\u6709\u4e00\u4e9b\u7279\u5b9a\u7684\u7f16\u8bd1\u9009\u9879\u5e2e\u52a9\u5f00\u53d1\u8005\u6392\u67e5\u7279\u5b9a\u7684\u9519\u8bef\uff0c\u6bd4\u5982CONFIG_DEBUG_SLAB\u53ef\u4ee5\u5e2e\u52a9\u6392\u67e5\u5fd8\u8bb0\u521d\u59cb\u5316\u5185\u5b58\u548c\u5185\u5b58\u8d8a\u754c\u8bbf\u95ee\u7684\u9519\u8bef\uff1b\u800cCONFIG_DEBUG_SPINLOCK \u53ef\u4ee5\u6392\u67e5\u975e\u6cd5\u4f7f\u7528\u81ea\u65cb\u9501\u7684\u9519\u8bef\u3002<\/p>\n

KGDB\u662f\u5e38\u7528\u7684\u8c03\u8bd5Linux\u5185\u6838\u7684\u8c03\u8bd5\u5668\u3002\u6700\u5f00\u59cb\uff0c\u5b83\u53ea\u662f\u4f5c\u4e3a\u4e00\u4e2a\u5185\u6838\u8865\u4e01\u53d1\u5e03\uff0c\u4ece\u5185\u68382.6.26\u5f00\u59cb\uff0c\u5b83\u88ab\u5408\u5e76\u5230\u4e86\u5185\u6838\u7684\u4e3b\u5e72\u4ee3\u7801\u3002\u7528KGDB\u8c03\u8bd5\u65f6\uff0c\u9700\u8981\u4e24\u53f0\u7528\u4e32\u53e3\u8fde\u63a5\u7684Linux\u673a\u5668\uff0c\u88ab\u8c03\u8bd5\u7684\u673a\u5668\u8fd0\u884cKGDB\uff0c\u53e6\u4e00\u53f0(\u8c03\u8bd5\u673a)\u5219\u8fd0\u884c\u666e\u901a\u7684GDB\u3002GDB\u8fdc\u7a0b\u534f\u8bae\u88ab\u7528\u4e8e\u5b83\u4eec\u4e4b\u95f4\u7684\u901a\u8baf[27]\u3002\u914d\u7f6eKGDB\u6bd4\u8f83\u9ebb\u70e6\uff0c\u4f46\u76ee\u524d\u684c\u9762\u865a\u62df\u5316\u6280\u672f\u975e\u5e38\u6210\u719f\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u7528\u4e24\u53f0Linux\u865a\u62df\u673a\u4f7f\u7528KGDB\uff0c\u7528\u865a\u62df\u7684\u4e32\u53e3\u786c\u4ef6\u8fde\u63a5\u4e24\u53f0\u673a\u5668\u3002\u4ec5\u7ba1\u5982\u6b64\uff0c\u4f7f\u7528\u5185\u6838\u8c03\u8bd5\u5668\u8fd8\u662f\u76f8\u5f53\u4e4b\u9ebb\u70e6\u3002\u88ab\u8c03\u8bd5\u7684\u5185\u6838\u5728\u7f16\u8bd1\u540e\u8f93\u51fa\u7684vmlinux\u6587\u4ef6\u662f\u672a\u538b\u7f29\u7684linux\u5185\u6838\uff0c\u9700\u8981\u88ab\u62f7\u8d1d\u5230\u8c03\u8bd5\u673a\uff1b\u5bf9\u5e94\u7684\u6e90\u4ee3\u7801\u9700\u8981\u88ab\u62f7\u8d1d\u5230\u8c03\u8bd5\u673a\u8c03\u8bd5\u65f6\u7684\u5f53\u524d\u76ee\u5f55\uff1b\u53e6\u5916\uff0c\u8c03\u8bd5\u65f6\u5e76\u4e0d\u80fd\u5728\u6240\u6709\u4ee3\u7801\u8bed\u53e5\u8bbe\u7f6e\u65ad\u70b9\uff0c\u56e0\u4e3a\u5185\u6838\u4ee3\u7801\u7684\u7f16\u8bd1\u4f9d\u8d56\u4e8eGCC\u7684\u7f16\u8bd1\u4f18\u5316\u9009\u9879\uff0c\u5f00\u542f\u76f8\u5e94\u7684\u4f18\u5316\u9009\u9879\u5185\u6838\u4ee3\u7801\u624d\u80fd\u901a\u8fc7\u7f16\u8bd1\uff0c\u800c\u5f88\u591a\u8bed\u53e5\u7684\u53d8\u91cf\u7ecf\u8fc7GCC\u4f18\u5316\u540e\u4f1a\u88ab\u53bb\u6389\uff0c\u8c03\u8bd5\u8005\u4ece\u6e90\u4ee3\u7801\u4e0a\u770b\u5230\u7684\u6267\u884c\u8def\u5f84\u7ecf\u5e38\u5e76\u975e\u5185\u6838\u5b9e\u9645\u7684\u6267\u884c\u8def\u5f84\u3002<\/p>\n

2.3 \u672c\u7ae0\u5c0f\u7ed3<\/h2>\n

    \u672c\u7ae0\u9996\u5148\u4ecb\u7ecd\u4e86Linux\u5185\u6838\u7684\u5185\u5b58\u7ba1\u7406\u7684\u4e00\u4e9b\u7406\u8bba\u548c\u6280\u672f\uff0c\u7136\u540e\u4ecb\u7ecd\u4e86\u8fdb\u884c\u5185\u6838\u5f00\u53d1\u6240\u5fc5\u987b\u638c\u63e1\u7684\u57fa\u7840\u77e5\u8bc6\u3002\u672c\u7ae0\u7684\u5185\u5bb9\u662f\u7406\u89e3\u4ee5\u540e\u7ae0\u8282\u7684\u57fa\u7840\u3002<\/p>\n

 <\/p>\n

\u7b2c\u4e09\u7ae0 KSM\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0<\/h1>\n

3.1 KSM\u7b80\u4ecb<\/h2>\n

KVM\u662fLinux\u5185\u6838\u4e3b\u5e72\u4ee3\u7801\u4e2d\u7684\u865a\u62df\u673a\u89e3\u51b3\u65b9\u6848[28]\u3002\u5f53\u4f7f\u7528\u4e86KVM\u865a\u62df\u5316\u6280\u672f\u7684Linux\u4e3b\u673a\u540c\u65f6\u8fd0\u884c\u591a\u4e2a\u64cd\u4f5c\u7cfb\u7edf\u65f6\u3002\u4e3b\u673a\u7684\u5185\u5b58\u91cc\u5b58\u5728\u7740\u5927\u91cf\u7684\u76f8\u540c\u5185\u5bb9\u7684\u9875\u9762\uff0c\u800c\u5185\u6838\u7684\u5185\u5b58\u7ba1\u7406\u4e0d\u80fd\u53d1\u73b0\u5b83\u4eec\uff0c\u4e0d\u80fd\u591f\u5171\u4eab\u8fd9\u4e9b\u76f8\u540c\u5185\u5bb9\u7684\u9875\u9762\u3002KSM\u7684\u51fa\u73b0\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u79cd\u5927\u91cf\u5197\u4f59\u5185\u5b58\u7684\u95ee\u9898\u3002KSM\u662f\u5185\u6838\u5171\u4eab\u5185\u5b58(Kernel Shared Memory)\u6216\u8005\u5185\u5b58\u76f8\u540c\u9875\u9762\u5408\u5e76(Kernel Samepage Merging)\u7684\u7b80\u79f0\uff0c\u662f\u968f\u7740Linux\u5185\u6838\u7684\u865a\u62df\u5316\u6280\u672f\u7684\u53d1\u5c55\u800c\u4ea7\u751f\u7684\u4e00\u79cd\u8282\u7701\u5185\u5b58\u7684\u6280\u672f\u3002KSM\u901a\u8fc7\u626b\u63cf\u8fd0\u884c\u865a\u62df\u673a\u7684\u5185\u5b58\u627e\u5230\u5185\u5bb9\u76f8\u540c\u9875\u9762\u5e76\u5c06\u4ed6\u4eec\u5408\u5e76\u4e3a\u4e00\u9875\uff0c\u4ece\u800c\u8282\u7701\u4e86\u5185\u5b58\uff0c\u4e8e\u662f\u53ef\u4ee5\u8fd0\u884c\u66f4\u591a\u7684\u865a\u62df\u673a\u3002\u66f4\u51c6\u786e\u5730\u8bb2\uff0cKSM\u626b\u63cf\u5e76\u5408\u5e76\u76f8\u540c\u7684\u533f\u540d\u9875\u9762\u3002\u800c\u57fa\u4e8eKVM\u865a\u62df\u8fd0\u884c\u64cd\u4f5c\u7cfb\u7edf\u65f6\u7528malloc()\u5206\u914d\u5185\u5b58\uff0cmalloc()\u5206\u914d\u5230\u7684\u5185\u5b58\u662fKSM\u53ef\u4ee5\u5408\u5e76\u7684\u533f\u540d\u533a\u57df\u3002<\/p>\n

KSM\u6700\u5f00\u59cb\u4ee5\u5185\u6838\u8865\u4e01\u7684\u65b9\u5f0f\u53d1\u5e03\uff0c\u4f46\u56e0\u4e3a\u4e00\u4e9b\u539f\u56e0\u672a\u80fd\u8fdb\u5165\u5185\u6838\u7684\u4e3b\u5e72\u4ee3\u7801\u3002\u9996\u5148\uff0cLinux\u793e\u533a\u7684\u5f00\u53d1\u8005\u4eec\u62c5\u5fc3KSM\u7684\u5b9e\u73b0\u4ee3\u7801\u4e2d\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002KSM\u7684\u6700\u521d\u7b97\u6cd5\u901a\u8fc7\u6bd4\u8f83\u4e24\u4e2a\u9875\u9762\u5185\u5bb9\u7684SHA1\u54c8\u5e0c\u503c\u6765\u5224\u65ad\u4e24\u4e2a\u9875\u9762\u662f\u5426\u76f8\u540c\u3002\u5982\u679c\u653b\u51fb\u8005\u901a\u8fc7\u54c8\u5e0c\u78b0\u649e\u7684\u65b9\u5f0f\u653b\u51fb\u5185\u6838\uff0c\u90a3\u4e48\u653b\u51fb\u8005\u6709\u53ef\u80fd\u628a\u6076\u610f\u6570\u636e\u6216\u4ee3\u7801\u6ce8\u5165\u5230\u7cfb\u7edf\u4e2d[29]\u3002\u53e6\u5916\uff0c\u793e\u533a\u5f00\u53d1\u8005\u8ba4\u4e3aVMWare\u516c\u53f8\u6301\u6709\u7684\u4e00\u4e2a\u7b97\u6cd5\u4e13\u5229\u548cKSM\u7684\u6700\u521d\u5b9e\u73b0\u975e\u5e38\u7c7b\u4f3c\uff0cLinux\u5f00\u53d1\u8005\u8ba4\u4e3a\u5728\u5185\u6838\u4e2d\u5305\u542bKSM\u53ef\u80fd\u4f1a\u7ed9Linux\u62db\u81f4\u6cd5\u5f8b\u65b9\u9762\u7684\u4e0d\u5fc5\u8981\u9ebb\u70e6\u3002<\/p>\n

\u540e\u6765\uff0cKSM\u6539\u53d8\u4e86\u5b9e\u73b0\u7684\u65b9\u6cd5\uff0c\u5e76\u987a\u5229\u901a\u8fc7\u4e86\u4ee3\u7801\u5ba1\u9605\u8fdb\u5165\u4e86Linux\u5185\u6838\u7684\u4e3b\u5e72\u4ee3\u7801\uff0c\u6210\u4e3a\u4e86KVM\u865a\u62df\u673a\u6280\u672f\u7684\u4e00\u4e2a\u91cd\u8981\u7684\u5185\u5b58\u4f18\u5316\u89e3\u51b3\u65b9\u6848[30]\u3002<\/p>\n

3.2 KSM\u7684\u4f7f\u7528<\/h2>\n

       KSM\u7684\u4f7f\u7528\u5305\u62ec\u5982\u4f55\u914d\u7f6eKSM\uff0c\u5982\u4f55\u7406\u89e3KSM\u7684\u4e00\u4e9b\u53c2\u6570\uff0c\u4ee5\u53ca\u5982\u4f55\u901a\u77e5KSM\u5408\u5e76\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\u3002<\/p>\n

3.2.1 \u901a\u8fc7sysfs\u4f7f\u7528KSM <\/h3>\n

       KSM\u529f\u80fd\u5728\u5185\u6838\u914d\u7f6e\u6587\u4ef6.config\u4e2d\u7531\u5f00\u5173CONFIG_KSM=y\u63a7\u5236\u662f\u5426\u7f16\u8bd1\u8fdb\u5185\u6838\u3002KSM\u76ee\u524d\u7684\u5b9e\u73b0\u4e0d\u80fd\u4ee5\u6a21\u5757\u7684\u65b9\u6cd5\u7f16\u8bd1\uff0c\u4e5f\u5c31\u662fCONFIG_KSM\u4e0d\u80fd\u7f6e\u4e3a\u503cm\u3002\u5982\u679cKSM\u88ab\u7f16\u8bd1\u8fdb\u5185\u6838\uff0c\u5185\u6838\u5728\u542f\u52a8\u540e\u4f1a\u521b\u5efaksmd\u5185\u6838\u7ebf\u7a0b\u3002<\/p>\n

 sysfs\u662fLinux\u5185\u6838\u7684\u4e00\u4e2a\u7279\u6b8a\u7684\u6587\u4ef6\u7cfb\u7edf\uff0c\u901a\u8fc7\u5b83\u53ef\u4ee5\u5b9e\u73b0\u5185\u6838\u7a7a\u95f4\u548c\u7528\u6237\u7a7a\u95f4\u7684\u4ea4\u4e92\u3002\u7ba1\u7406\u548c\u914d\u7f6eKSM\u4e5f\u662f\u901a\u8fc7sysfs\u8fdb\u884c\uff0c\u4f4d\u7f6e\u5728\/sys\/kernel\/mm\/ksm\u76ee\u5f55\u4e0b[31]\u3002\u5728\u8be5\u76ee\u5f55\u4e0b\u53ef\u4ee5\u627e\u5230\u4e00\u7cfb\u5217\u6587\u4ef6\uff0c\u6709\u4e00\u4e9b\u6587\u4ef6\u7528\u6765\u63a7\u5236KSM\uff0c\u6709\u4e00\u4e9b\u6587\u4ef6\u7528\u6765\u76d1\u89c6KSM\u7684\u8fd0\u884c\u72b6\u6001\u3002\u8be5\u76ee\u5f55\u4e0b\u7684\u6587\u4ef6\uff1arun\uff0c\u7528\u6765\u5f00\u542f\u548c\u505c\u7528KSM\u3002\u5728\u9ed8\u8ba4\u914d\u7f6e\u4e0b\uff0cKSM\u662f\u88ab\u505c\u7528\u7684\uff0c\u5982\u679c\u5199\u5165\u503c1\u5230\u6587\u4ef6run\uff0c\u5219\u4f1a\u5f00\u542fKSM\u3002\u4f8b\u5982\uff1aecho 1 > \/sys\/kernel\/mm\/ksm\/run\u3002\u5728run=1\u7684\u72b6\u6001\u4e0b\uff0c\u518d\u5199\u5165\u503c0\u5230run\u6587\u4ef6\uff0c\u5219\u4f1a\u505c\u7528KSM\u3002\u6b64\u5916\uff0c\u5728run=1\u7684\u72b6\u6001\u4e0b\uff0c\u8fd8\u53ef\u4ee5\u5199\u503c2\u5230run\u6587\u4ef6\uff0c\u8981\u6c42\u628a\u5408\u5e76\u7684\u6240\u6709\u9875\u9762\u518d\u62c6\u5206\u51fa\u6765\u3002<\/p>\n

\u5f53KSM\u5728\u8fd0\u884c\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e09\u4e2a\u53c2\u6570\u914d\u7f6eKSM\u7684\u8fd0\u884c\u72b6\u6001\u3002\u5176\u4e2d\uff0c\u6587\u4ef6sleep_millisecs\u6307\u660e\u4e86\u5185\u6838\u7ebf\u7a0bksmd\u5728\u6267\u884c\u5b8c\u6bcf\u6b21\u626b\u63cf\u4e4b\u540e\u9700\u8981\u81f3\u5c11\u7761\u7720\u591a\u957f\u7684\u65f6\u95f4\u3002\u6587\u4ef6pages_to_scan\u5b9a\u4e49\u4e86\u6bcf\u6b21\u626b\u63cf\u9700\u8981\u626b\u63cf\u591a\u5c11\u4e2a\u9875\u9762\u3002\u6bcf\u4e2a\u7528\u6237\u90fd\u53ef\u4ee5\u67e5\u770b\u8be5\u6587\u4ef6\uff0c\u4f46\u53ea\u6709\u6709\u7cfb\u7edf\u6743\u9650\u7684\u7528\u6237\u53ef\u4ee5\u66f4\u6539pages_to_scan\u7684\u503c\u3002\u5171\u67095\u4e2a\u6587\u4ef6\u7528\u6765\u663e\u793aKSM\u7684\u8fd0\u884c\u60c5\u51b5\uff0c\u8fd95\u4e2a\u6587\u4ef6\u90fd\u662f\u53ea\u8bfb\u7684\u3002\u6587\u4ef6full_scans\u6307\u793aKSM\u5df2\u7ecf\u5b8c\u6210\u4e86\u591a\u5c11\u6b21\u5168\u9762\u626b\u63cf\u3002\u6587\u4ef6pages_shared\u6307\u660e\u4e86KSM\u4e2d\u7684\u7a33\u5b9a\u6811\u4e0a\u5df2\u6536\u96c6\u4e86\u591a\u5c11\u4e2aKSM\u9875\u9762\u3002\u6587\u4ef6pages_sharing\u6307\u660e\u4e86\u8282\u7701\u4e86\u591a\u5c11\u4e2a\u9875\u9762\u7684\u5185\u5b58\u3002\u6587\u4ef6pages_unshared\u5219\u663e\u793a\u4e0d\u65ad\u88ab\u626b\u63cf\u4f46\u53c8\u672a\u80fd\u5408\u5e76\u7684\u9875\u9762\u6570\u3002\u6587\u4ef6pages_volatile\u663e\u793a\u56e0\u4e3a\u9875\u9762\u5185\u5bb9\u53d8\u5316\u592a\u5feb\u800c\u4e0d\u88ab\u5408\u5e76\u7684\u9875\u9762\u6570\u3002\u7528\u6587\u4ef6pages_sharing\u7684\u503c\u6bd4\u4e0apages_shared\u7684\u503c\uff0c\u5982\u679c\u8fd9\u4e2a\u503c\u8d8a\u5927\uff0c\u8bf4\u660eKSM\u8fd0\u884c\u7684\u6548\u7387\u8d8a\u9ad8\uff0c\u53cd\u4e4b\u5219\u8fd0\u884c\u6548\u7387\u8d8a\u4f4e\u3002<\/p>\n

3.2.2 KSM\u7684\u7f16\u7a0b\u63a5\u53e3 <\/h3>\n

      \u867d\u7136KSM\u53ef\u4ee5\u626b\u63cf\u5e76\u5408\u5e76\u7cfb\u7edf\u4e2d\u76f8\u540c\u7684\u533f\u540d\u9875\u9762\uff0c\u4f46\u5728\u8fd9\u4e2a\u626b\u63cf\u548c\u5408\u5e76\u8fc7\u7a0b\u4e2d\uff0cKSM\u9700\u8981\u6d88\u8017\u5904\u7406\u5668\u8d44\u6e90\uff0c\u540c\u65f6\u4e5f\u9700\u8981\u6d88\u8017\u4e00\u90e8\u5206\u5185\u5b58\u3002\u5982\u679cKSM\u626b\u63cf\u7684\u5927\u91cf\u5185\u5b58\u533a\u57df\u5e76\u6ca1\u6709\u8db3\u591f\u591a\u7684\u5185\u5bb9\u76f8\u540c\u7684\u533f\u540d\u9875\u9762\uff0c\u90a3\u4e48KSM\u975e\u4f46\u6ca1\u6709\u964d\u4f4e\u5185\u5b58\u7684\u4f7f\u7528\u91cf\uff0c\u76f8\u53cd\u8fd8\u4f1a\u56e0\u4e3a\u652f\u6491\u81ea\u5df1\u7684\u8fd0\u884c\u800c\u6d88\u8017\u66f4\u591a\u7684\u5185\u5b58\u3002KSM\u7684\u89e3\u51b3\u529e\u6cd5\u662f\u628a\u5bfb\u627e\u5177\u6709\u5927\u91cf\u76f8\u540c\u5185\u5bb9\u5185\u5b58\u7684\u8d23\u4efb\u8f6c\u7ed9\u7a0b\u5e8f\u7f16\u5199\u8005\u3002<\/p>\n

Linux\u7684\u7cfb\u7edf\u8c03\u7528madvise[32]\u7528\u6765\u5efa\u8bae\u5185\u6838\u5982\u4f55\u5904\u7406\u4ece\u865a\u62df\u5730\u5740addr\u5f00\u59cb\uff0c\u957flength\u4e2a\u5b57\u8282\u7684\u5185\u5b58\u533a\u57df\u3002\u8be5\u7cfb\u7edf\u8c03\u7528\u7684\u51fd\u6570\u539f\u578b\u4e3a\uff1aint madvise(void *addr, size_t length, int advice)\u3002KSM\u5047\u8bbe\u7a0b\u5e8f\u5458\u77e5\u9053\u54ea\u4e9b\u533a\u57df\u5305\u542b\u5927\u91cf\u7684\u53ef\u5408\u5e76\u5185\u5b58\u3002\u4e8e\u662f\uff0c\u4ece\u5185\u6838\u7248\u672c2.6.32\u5f00\u59cbKSM\u5728\u7cfb\u7edf\u8c03\u7528madvise\u4e2d\u65b0\u52a0\u5165\u4e86\u4e24\u4e2a\u53c2\u6570\uff1aMADV_MERGEABLE \u548cMADV_UNMERGEABLE\u3002\u5e94\u7528\u7a0b\u5e8f\u4ee3\u7801\u4e2d\u901a\u8fc7\u7528\u53c2\u6570MADV_MERGEABLE\u8c03\u7528\u51fd\u6570madvise\u5efa\u8baeKSM\u626b\u63cf\u54ea\u4e9b\u5185\u5b58\u533a\u57df\uff0cKSM\u5219\u628a\u76f8\u5e94\u7684\u5185\u5b58\u533a\u57dfVMA\u52a0\u4e0aVM_MERGEABLE\u6807\u5fd7\u4f4d\uff1b\u7528MADV_UNMERGEABLE\u53d6\u6d88\u4e4b\u524d\u7684\u5efa\u8bae\uff0c\u76f8\u5e94\u7684VMA\u786e\u4fdd\u6ca1\u6709VM_MERGEABLE\u6807\u5fd7\u4f4d\u3002\u5206\u6790KSM\u7684\u6e90\u4ee3\u7801\u53ef\u77e5\uff0c\u5b9e\u9645\u4e0aKSM\u627e\u5230\u6307\u5b9a\u533a\u57df\u6240\u5728\u7684VMA\uff0c\u5e76\u628a\u8be5VMA\u7f6eVM_MERGEABLE\u6807\u5fd7\uff0c\u4e4b\u540e\u5c06\u626b\u63cf\u6574\u4e2aVMA\u7684\u5185\u5b58\u533a\u57df\uff0c\u5e76\u4e0d\u4e25\u683c\u9075\u5b88madvise\u8bbe\u5b9a\u7684\u8d77\u59cb\u8303\u56f4\u3002<\/p>\n

3.3 KSM\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0<\/h2>\n

      \u672c\u8282\u5c06\u4ecb\u7ecd\u8bbe\u8ba1\u548c\u5b9e\u73b0KSM\u7684\u4e3b\u8981\u601d\u8def\uff0c\u7279\u522b\u4ecb\u7ecd\u4e86\u6700\u4e3a\u5173\u952e\u7684\u7a33\u5b9a\u6811\u548c\u4e0d\u7a33\u5b9a\u6811\u4e24\u4e2a\u6570\u636e\u7ed3\u6784\uff0c\u5e76\u5bf9KSM\u7684\u6548\u7387\u4f5c\u7b80\u8981\u7684\u5206\u6790\u3002<\/p>\n

3.3.1 KSM\u7684\u57fa\u672c\u7b97\u6cd5<\/h3>\n

KSM\u7b97\u6cd5\u7684\u6838\u5fc3\u601d\u60f3\u662f\u901a\u8fc7\u628a\u9700\u8981\u626b\u63cf\u7684\u9875\u9762\u63d2\u5165\u4e24\u68f5\u7ea2\u9ed1\u6811\u4e4b\u4e00\u6765\u67e5\u627e\u5230\u5185\u5bb9\u76f8\u540c\u7684\u9875\u9762\u3002\u7ea2\u9ed1\u6811\u7528\u9875\u9762\u7684\u5185\u5bb9\u4f5c\u4e3a\u6811\u7684\u7d22\u5f15\uff0c\u7528\u51fd\u6570memcmp()\u9010\u5b57\u8282\u7684\u6bd4\u8f83\u4e24\u4e2a\u9875\u9762\u6765\u5224\u65ad\u9875\u9762\u662f\u5426\u76f8\u7b49\u3002\u5982\u679c\u4e24\u9875\u9762\u5185\u5bb9\u4e0d\u7b49\uff0cmemcmp()\u51fd\u6570\u8fd4\u56de\u5c0f\u4e8e0\u7684\u503c\u6216\u8005\u5927\u4e8e0\u7684\u503c\u51b3\u5b9a\u4e0b\u4e00\u6b65\u5f80\u7ea2\u9ed1\u6811\u7684\u5de6\u8fb9\u641c\u7d22\u8fd8\u662f\u5f80\u53f3\u8fb9\u641c\u7d22\u3002\u8fd9\u4e24\u68f5\u7ea2\u9ed1\u6811\u5176\u4e2d\u4e00\u68f5\u79f0\u4e3a\u7a33\u5b9a\u6811(\u5982\u56fe3-1\u6240\u793a)\uff0c\u53e6\u4e00\u68f5\u79f0\u4e3a\u4e0d\u7a33\u5b9a\u6811\u3002\u7a33\u5b9a\u6811\u7528\u6765\u5b58\u653e\u5df2\u7ecf\u5408\u5e76\u7684\u9875\u9762\uff0c\u88ab\u79f0\u4e4b\u4e3aKSM\u9875\u9762\u3002\u4e0d\u7a33\u5b9a\u6811\u7528\u6765\u7b5b\u9009\u5408\u9002\u7684\u5019\u9009\u5408\u5e76\u9875\u9762[33]\u3002 <\/p>\n

KSM\u7684\u4e3b\u8981\u7b97\u6cd5\u6d41\u7a0b\u5982\u56fe3-1\u6240\u793a\u3002\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u88ab\u626b\u63cf\u7684\u533f\u540d\u9875\u9762\uff0cKSM\u5148\u5c1d\u8bd5\u5728\u7a33\u5b9a\u6811\u4e2d\u67e5\u627e\u662f\u5426\u6709\u9875\u9762\u5185\u5bb9\u4e0e\u88ab\u626b\u63cf\u9875\u9762\u7684\u5185\u5bb9\u4e00\u81f4\u3002\u5982\u679c\u5728\u7a33\u5b9a\u6811\u4e2d\u627e\u5230\u4e86\u8fd9\u6837\u7684\u5339\u914d\uff0c\u88ab\u626b\u63cf\u7684\u9875\u9762\u5219\u88ab\u5408\u5e76\u5230\u5339\u914d\u5230\u7684KSM\u9875\u9762\u3002\u5982\u679c\u5728\u7a33\u5b9a\u6811\u4e2d\u672a\u80fd\u627e\u5230\u5339\u914d\u9879\uff0cKSM\u8ba1\u7b97\u88ab\u626b\u63cf\u7684\u533f\u540d\u9875\u9762\u7684\u6821\u9a8c\u548c\u3002\u5982\u679c\u6821\u9a8c\u548c\u4e0e\u4e0a\u6b21KSM\u626b\u63cf\u65f6\u8ba1\u7b97\u7684\u503c\u4e0d\u4e00\u6837\uff0c\u90a3\u4e48KSM\u66f4\u65b0\u8fd9\u4e2a\u9875\u9762\u7684\u6821\u9a8c\u548c\uff0c\u63a8\u8fdf\u4ee5\u8be5\u9875\u9762\u5185\u5bb9\u4e3a\u7d22\u5f15\u641c\u7d22\u4e0d\u7a33\u5b9a\u6811\u3002\u8fd9\u6837\u7684\u597d\u5904\u662f\u907f\u514d\u4e86\u628a\u4e00\u4e2a\u66f4\u65b0\u9891\u7387\u5f88\u5feb\u7684\u9875\u9762\u653e\u5165\u4e0d\u7a33\u5b9a\u6811\u3002\u5982\u679c\u68c0\u9a8c\u548c\u4e0e\u4e0a\u6b21\u626b\u63cf\u65f6\u6ca1\u6709\u53d1\u751f\u53d8\u5316\uff0cKSM\u5728\u4e0d\u7a33\u5b9a\u6811\u4e2d\u5f00\u59cb\u641c\u7d22\u5339\u914d\u9875\u9762\u3002\u5982\u679c\u5728\u4e0d\u7a33\u5b9a\u6811\u4e2d\u627e\u5230\u76f8\u5e94<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe3-1 KSM\u7b97\u6cd5\u6d41\u7a0b\u56fe<\/p>\n

 <\/p>\n

\u7684\u5339\u914d\u9879\uff0cKSM\u5408\u5e76\u5339\u914d\u9875\u9762\u548c\u5f53\u524d\u88ab\u626b\u63cf\u7684\u9875\u9762\uff0c\u5e76\u628a\u5339\u914d\u9875\u9762\u4ece\u4e0d\u7a33\u5b9a\u6811\u4e2d\u5220\u9664\u3002\u5408\u5e76\u540e\u751f\u6210\u4e00\u4e2aKSM\u9875\u9762\u88ab\u63d2\u5165\u7a33\u5b9a\u6811\uff0c\u5e76\u628aKSM\u9875\u9762\u5199\u4fdd\u62a4\u3002\u5982\u679c\u672a\u80fd\u5728\u4e0d\u7a33\u5b9a\u6811\u4e2d\u627e\u5230\u5339\u914d\u9879\uff0cKSM\u628a\u88ab\u626b\u63cf\u7684\u9875\u9762\u63d2\u5165\u4e0d\u7a33\u5b9a\u6811\uff0c\u8be5\u9875\u9762\u4e0d\u88ab\u5199\u4fdd\u62a4\u3002\u8fd9\u91cc\u68c0\u67e5\u9875\u9762\u7684\u6821\u9a8c\u548c\u5b9e\u9645\u4e0a\u5bf9\u6574\u4e2aKSM\u7b97\u6cd5\u53ea\u8d77\u6765\u8f85\u52a9\u7684\u4f5c\u7528\u3002\u6821\u9a8c\u548c\u5e76\u4e0d\u4f5c\u4e3a\u7d22\u5f15\u641c\u7d22\u4e0d\u7a33\u5b9a\u6811\uff0c\u800c\u662f\u7528\u6765\u7b5b\u9009\u4e00\u4e2a\u8db3\u591f\u7a33\u5b9a\u7684\u9875\u9762\u7528\u6765\u5408\u5e76\u3002\u5982\u679c\u4e00\u4e2a\u9875\u9762\u66f4\u65b0\u7684\u592a\u5feb\uff0c\u5219\u5931\u53bb\u4e86\u5408\u5e76\u7684\u610f\u4e49\uff0c\u76f8\u53cd\u4f1a\u5f71\u54cd\u4e0d\u7a33\u5b9a\u6811\u7684\u6548\u7387\u3002\u5982\u679c\u4e00\u4e2a\u7ecf\u5e38\u53d8\u5316\u7684\u9875\u9762\u88ab\u5408\u5e76\u5230\u4e86\u7a33\u5b9a\u6811\uff0c\u5219\u53ef\u9884\u89c1\u5408\u5e76\u540e\u7acb\u5373\u53d1\u751f\u4e00\u4e2a\u5199\u65f6\u62f7\u8d1d\u7684\u9875\u9762\u9519\u8bef\uff0c\u53c8\u8981\u628a\u8be5\u53d8\u5316\u7684\u9875\u9762\u91cd\u65b0\u5206\u51fa\u6765\uff0c\u6d6a\u8d39\u4e86\u5904\u7406\u5668\u8d44\u6e90\u3002\u5728\u6574\u4e2aKSM\u7b97\u6cd5\u4e2d\uff0c\u5982\u679c\u53bb\u6389\u68c0\u67e5\u6821\u9a8c\u548c\u8fd9\u4e00\u6b65\u9aa4\uff0c\u4e5f\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\uff0c\u4f46\u4f1a\u964d\u4f4eKSM\u7684\u6548\u7387\u3002<\/p>\n

3.3.2 \u7a33\u5b9a\u6811<\/h3>\n

\u7ea2\u9ed1\u6811\u662f\u4e00\u79cd\u5e73\u8861\u4e8c\u53c9\u67e5\u627e\u6811\uff0c\u5728Linux\u5185\u6838\u4ee3\u7801\u4e2d\u6709\u5e7f\u6cdb\u7684\u5e94\u7528\u3002\u9c81\u9053\u592b·\u8d1d\u5c14\u4e8e1972\u5e74\u53d1\u660e\u4e86\u7ea2\u9ed1\u6811\uff0c\u4ed6\u5f53\u65f6\u628a\u5b83\u79f0\u4e4b\u4e3a"\u5bf9\u79f0\u4e8c\u53c9B\u6811"[34]\uff0c\u800c\u7ea2\u9ed1\u6811\u662f\u73b0\u4ee3\u7684\u540d\u5b57\u3002\u7ea2\u9ed1\u6811\u7684\u6bcf\u4e2a\u8282\u70b9\u90fd\u5fc5\u987b\u5e26\u6709\u989c\u8272\u5c5e\u6027\uff0c\u6216\u7ea2\u8272\u6216\u9ed1\u8272\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u7ea2\u9ed1\u6811\u8fd8\u5fc5\u987b\u6ee1\u8db3\u5176\u5b83\u4e00\u4e9b\u7279\u6027\uff1a\u6839\u8282\u70b9\u5177\u6709\u9ed1\u8272\u5c5e\u6027\uff0c\u6bcf\u4e2a\u53f6\u8282\u70b9\u4e5f\u662f\u9ed1\u8272\u5c5e\u6027\uff0c\u6bcf\u4e2a\u7ea2\u8272\u5c5e\u6027\u7684\u8282\u70b9\u7684\u4e24\u4e2a\u5b50\u8282\u70b9\u90fd\u662f\u9ed1\u8272\u5c5e\u6027(\u5373\u4ece\u6bcf\u4e2a\u53f6\u5b50\u5230\u6839\u7684\u6240\u6709\u8def\u5f84\u4e0a\u4e0d\u53ef\u80fd\u51fa\u73b0\u4e24\u4e2a\u8fde\u7eed\u7684\u7ea2\u8272\u8282\u70b9)\uff0c\u4ece\u4efb\u4e00\u4e2a\u8282\u70b9\u5230\u5176\u6bcf\u4e2a\u53f6\u5b50\u7684\u6240\u6709\u8def\u5f84\u90fd\u5305\u542b\u76f8\u540c\u6570\u76ee\u7684\u9ed1\u8272\u8282\u70b9\u3002\u5bf9\u7ea2\u9ed1\u6811\u7684\u67e5\u627e\uff0c\u63d2\u5165\u548c\u5220\u9664\u90fd\u53ef\u4ee5\u5728O(log n)\u65f6\u95f4\u5185\u5b8c\u6210\uff0c\u5176\u4e2d\u7684n\u662f\u6811\u4e2d\u5143\u7d20\u7684\u6570\u76ee\u3002<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe3-2 \u7a33\u5b9a\u6811<\/p>\n

 <\/p>\n

\u7a33\u5b9a\u6811\u662f\u4e00\u68f5\u7ea2\u9ed1\u6811\u3002\u88ab\u626b\u63cf\u7684\u9875\u9762\u5728\u4e0d\u7a33\u5b9a\u6811\u4e2d\u627e\u5230\u5339\u914d\u9875\u9762\u540e\uff0c\u5b83\u4eec\u88ab\u5408\u5e76\uff0c\u4ea7\u751f\u7684KSM\u9875\u9762\u5c31\u8fdb\u5165\u7a33\u5b9a\u6811\u3002\u7a33\u5b9a\u6811\u7684\u6bcf\u4e2a\u7ed3\u70b9\u90fd\u5b58\u653e\u4e86\u5df2\u7ecf\u88ab\u5171\u4eab\u7684\u9875\u9762\u3002\u4e3a\u4e86\u4fdd\u8bc1\u4f5c\u4e3a\u6811\u7d22\u5f15\u7684\u9875\u9762\u5185\u5bb9\u4e0d\u88ab\u4fee\u6539\uff0c\u9875\u9762\u88ab\u5199\u4fdd\u62a4\u3002\u5982\u679c\u5185\u6838\u4e2d\u67d0\u6267\u884c\u5e8f\u5217\u5199\u5165\u5b58\u4e8e\u7a33\u5b9a\u6811\u4e2d\u7684KSM\u9875\u9762\uff0c\u5c31\u4f1a\u4ea7\u751f\u4e00\u4e2a\u5199\u65f6\u62f7\u8d1d\u7684\u9519\u8bef\u3002\u6267\u884c\u5199\u64cd\u4f5c\u7684\u7a0b\u5e8f\u5f97\u5230\u88ab\u5199\u4fdd\u62a4\u9875\u9762\u7684\u4e00\u4efd\u62f7\u8d1d\u3002\u7a33\u5b9a\u6811\u5982\u56fe3-2\u6240\u793a\uff1a<\/p>\n

3.3.3 \u4e0d\u7a33\u5b9a\u6811<\/h3>\n

KSM\u4e2d\u7684\u4e0d\u7a33\u5b9a\u6811\u4e5f\u662f\u4e00\u68f5\u7ea2\u9ed1\u6811\uff0c\u4f46\u4e0e\u5185\u6838\u4e2d\u5176\u5b83\u7edd\u5927\u591a\u6570\u5e94\u7528\u7ea2\u9ed1\u6811\u7684\u6570\u636e\u7ed3\u6784\u4e0d\u540c\uff0c\u4e0d\u7a33\u5b9a\u6811\u7684\u7d22\u5f15\u5373\u9875\u9762\u5185\u5bb9\u3002\u800c\u9875\u9762\u5185\u5bb9\u968f\u65f6\u53ef\u80fd\u4f1a\u53d1\u751f\u53d8\u5316\uff0c\u56e0\u6b64\u8be5\u6811\u4f1a\u56e0\u6b64\u90e8\u5206\u4e0d\u53ef\u7528\u3002\u4f46KSM\u4e0d\u80fd\u50cf\u5bf9\u5f85\u7a33\u5b9a\u6811\u90a3\u6837\u5199\u4fdd\u62a4\u4e0d\u7a33\u5b9a\u6811\u4e2d\u7684\u9875\u9762\u3002\u8fd9\u662f\u56e0\u4e3a\u5982\u679c\u4e0d\u7a33\u5b9a\u6811\u4e2d\u7684\u9875\u9762\u88ab\u5199\u4fdd\u62a4\u7684\u8bdd\u5c06\u4f1a\u5bfc\u81f4\u5927\u91cf\u7684\u5199\u65f6\u62f7\u8d1d\uff0c\u81f4\u4f7f\u6d88\u8017\u5927\u91cf\u7684\u5904\u7406\u5668\u8d44\u6e90\u5904\u7406\u9875\u9762\u9519\u8bef\u3002\u597d\u6d88\u606f\u662f\u5411\u7ea2\u9ed1\u6811\u63d2\u5165\u6216\u5220\u9664\u6570\u636e\u7684\u65b9\u6cd5rb_insert()\u548crb_erase()\u5e76\u4e0d\u9700\u8981\u67e5\u8be2\u7ea2\u9ed1\u6811\u4e0a\u7684\u7ed3\u70b9\u7684\u7d22\u5f15\u503c\u5c31\u80fd\u591f\u8ba9\u6811\u4fdd\u6301\u5e73\u8861\u3002\u4e00\u4e2a\u4ecd\u7136\u5904\u4e8e\u5b8c\u5168\u53ef\u5de5\u4f5c\u72b6\u6001\u7684\u4e0d\u7a33\u5b9a\u6811\u5982\u56fe3-3\u5982\u793a\u3002\u6b64\u65f6\u5728\u6811\u9876\u7684\u7684\u9875\u9762\u7684\u7d22\u5f15\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u662f3\uff0c\u5982\u679c\u8fd9\u4e2a\u7d22\u5f15\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u53c8\u88ab\u7a0b\u5e8f\u4fee\u6539\u4e3a7\uff0c\u5219\u5982\u56fe3-4\u5982\u793a\uff0c\u90a3\u4e48\u5728\u8fd9\u68f5\u6811\u4e2d\u67e5\u627e\u7b2c\u4e00\u4e2a\u5b57\u8282\u4e3a4\uff0c5\uff0c\u6216\u80056\u7684\u9875\u9762\u65f6\u5c06\u5f97\u4e0d\u5230\u6b63\u786e\u7ed3\u679c\u3002\u4e3a\u4e86\u5e94\u5bf9\u8fd9\u6837\u4e00\u79cd\u4e0d\u5229\u60c5\u51b5\uff0cKSM\u7684\u89e3\u51b3\u65b9\u6848\u662f\u5728\u6bcf\u6b21\u626b\u63cf\u5b8c\u6240\u6709\u6ce8\u518c\u7684\u5185\u5b58\u533a\u57df\u540e\uff0c\u5c06\u4e0d\u7a33\u5b9a\u6811\u8bbe\u7f6e\u4e3a\u7a7a\u6811\uff0c\u5373\u91cd\u5efa\u4e0d\u7a33\u5b9a\u6811\u3002\u8fd9\u6837\uff0c\u56e0\u4e3a\u6811\u7ed3\u70b9\u7684\u7d22\u5f15\u53d8\u5316\u800c\u9020\u6210\u7684\u8d1f\u9762\u6548\u679c\u4e0d\u4f1a\u6301\u7eed\u5f71\u54cd\u65b0\u7684\u4e00\u6b21\u626b\u63cf\u3002\u53e6\u4e00\u79cd\u5e94\u5bf9\u4e0d\u7a33\u5b9a\u6811\u90e8\u5206\u4e0d\u53ef\u7528\u7684\u89e3\u51b3\u65b9\u6848\u662f\uff0cKSM\u53ef\u4ee5\u5728\u6bcf\u6b21\u67e5\u8be2\u4e0d\u7a33\u5b9a\u6811\u7684\u8fc7\u7a0b\u4e2d\u68c0\u67e5\u7ecf\u8fc7\u7684\u6811\u7ed3\u70b9\u7684\u6821\u9a8c\u548c\uff0c\u5982\u679c\u68c0\u9a8c\u548c\u4e0e\u4e0a\u4e00\u6b21\u7684\u65e7\u6821\u9a8c\u548c\u4e0d\u4e00\u81f4\u5c31\u628a\u8be5\u7ed3\u70b9\u4ece\u4e0d\u7a33\u5b9a\u6811\u4e2d\u5220\u9664\uff0c\u4f46\u8fd9\u6837\u505a\u4f1a\u6bd4\u4ec5\u4ec5\u7528memcmp()\u51fd\u6570\u6bd4\u8f83\u4e24\u4e2a\u9875\u9762\u7684\u5185\u5bb9\u8981\u6162\u5f97\u591a\uff0c\u56e0\u6b64KSM\u91c7\u53d6\u91cd\u5efa\u4e0d\u7a33\u5b9a\u6811\u7684\u7b56\u7565\u3002<\/p>\n

<\/p>\n

\u56fe3-3 \u5b8c\u5168\u53ef\u7528\u7684\u4e0d\u7a33\u5b9a\u6811<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe3-4 \u5931\u53bb\u90e8\u5206\u53ef\u7528\u6027\u7684\u4e0d\u7a33\u5b9a\u6811<\/p>\n

 <\/p>\n

3.3.4 KSM\u7684\u6548\u7387<\/h3>\n

Linux\u5185\u6838\u5728x86\u67b6\u6784\u4e0a\u7684\u5b9e\u73b0\u4e2d\uff0c\u548c\u5176\u5b83\u5927\u591a\u6570\u5e73\u53f0\u7684\u5b9e\u73b0\u4e2d\uff0c\u4e00\u4e2a\u9875\u9762\u7684\u5927\u5c0f\u901a\u5e38\u662f4096\u4e2a\u5b57\u8282\u3002\u5f53\u7528memcmp()\u51fd\u6570\u6bd4\u8f83\u4e24\u4e2a\u9875\u9762\u65f6\uff0c\u6700\u574f\u7684\u60c5\u51b5\u4e0b\u8981\u6bd4\u8f834096\u4e2a\u5b57\u8282\uff0c\u5e73\u5747\u60c5\u51b5\u4e0b\u7684\u6548\u7387\u5219\u5feb\u5f97\u591a\uff0c\u8fd9\u662f\u56e0\u4e3a\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u5982\u679c\u4e24\u4e2a\u9875\u9762\u4e0d\u4e00\u81f4\uff0c\u5728\u6bd4\u8f83\u9875\u9762\u5185\u5bb9\u7684\u524d\u51e0\u4e2a\u5b57\u8282\u65f6\u5c31\u80fd\u4f7fmemcmp()\u51fd\u6570\u9000\u51fa\u4e86\u3002\u5728\u4e00\u68f5\u7ea2\u9ed1\u6811\u4e2d\u67e5\u627e\u5230\u5185\u5bb9\u76f8\u540c\u7684\u9875\u9762\u7684\u590d\u6742\u5ea6\u662f\u7528memcmp()\u51fd\u6570\u7684\u5f00\u9500\u4e58\u4ee5\u7ea2\u9ed1\u6811\u7684\u9ad8\u5ea6\u3002\u7531\u4e8e\u7ea2\u9ed1\u6811\u7684\u826f\u597d\u6027\u80fd\uff0c\u5b83\u7684\u63d2\u5165\u3001\u641c\u7d22\u3001\u5220\u9664\u7684\u65f6\u95f4\u590d\u6742\u5fd7\u662fO(log(n))\uff0c\u5176\u4e2dn\u8868\u793aKSM\u626b\u63cf\u7684\u9875\u9762\u6570\u3002\u6240\u4ee5\uff0c\u5373\u4f7f\u5728\u6700\u574f\u7684\u6781\u7aef\u60c5\u51b5\u4e0b\uff0cmemcmp()\u51fd\u6570\u6bcf\u6b21\u90fd\u8981\u6bd4\u8f83\u5230\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u624d\u9000\u51fa\u3002KSM\u7b97\u6cd5\u7684\u6027\u80fd\u4e5f\u4e0d\u4f1a\u975e\u5e38\u5dee\u3002<\/p>\n

3.4 \u5173\u952e\u4ee3\u7801\u5206\u6790<\/h2>\n

\u672c\u8282\u5c06\u5728\u6e90\u4ee3\u7801\u5c42\u9762\u4ecb\u7ecdKSM\u7684\u4e3b\u8981\u6570\u636e\u7ed3\u6784\uff0c\u4ee5\u53ca\u5408\u5e76\u91cd\u590d\u9875\u9762\u65f6\u7684\u5173\u952e\u51fd\u6570\u3002<\/p>\n

3.4.1 KSM\u7684\u4e3b\u8981\u6570\u636e\u7ed3\u6784<\/h3>\n

KSM\u4e2d\u4e3b\u8981\u7684\u6570\u636e\u7ed3\u6784\u6709mm_slot\uff0cksm_scan\uff0cstable_node\uff0crmap_item\u3002\u5bf9\u5e94\u6bcf\u4e00\u4e2a\u88ab\u626b\u63cf\u7684\u5185\u5b58\u63cf\u8ff0\u7b26mm_struct\uff0cKSM\u90fd\u6709\u4e00\u4e2amm_slot\u63cf\u8ff0\u4e86\u4e00\u4e9b\u76f8\u5173\u4fe1\u606f\u3002\u5b83\u7684\u5b9a\u4e49\u5982\u56fe3-5\u6240\u793a\uff1a<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe3-5 mm_slot\u7684\u5b9a\u4e49<\/p>\n

 <\/p>\n

\u5176\u4e2d\uff0clink\u5b57\u6bb5\u7528\u6765\u94fe\u63a5\u88ab\u54c8\u5e0c\u5230\u76f8\u540c\u54c8\u5e0c\u8868\u4f4d\u7f6e\u7684mm_slot\uff0cmm_list\u5b57\u6bb5\u94fe\u63a5KSM\u7b97\u6cd5\u4e2d\u6240\u6709\u7684mm_slot\uff0crmap_list\u5b57\u6bb5\u7528\u6765\u94fe\u63a5\u5c5e\u4e8e\u8be5mm_slot\u7684\u6240\u6709rmap_item\uff0cmm\u5b57\u6bb5\u662f\u8be5mm_slot\u5bf9\u5e94\u7684\u5185\u5b58\u63cf\u8ff0\u7b26\u3002<\/p>\n

ksm_scan\u8bb0\u8f7d\u4e86\u5f53\u524d\u6b63\u626b\u63cf\u5230\u7684\u4f4d\u7f6e\u3002\u5b83\u7684\u5b9a\u4e49\u5982\u56fe3-6\u6240\u793a\uff1a<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe3-6 ksm_scan\u7684\u5b9a\u4e49<\/p>\n

 <\/p>\n

\u5176\u4e2d\uff0cmm_slot\u5b57\u6bb5\u8868\u793a\u5f53\u524d\u6b63\u5728\u626b\u63cf\u7684mm_slot\u7ed3\u6784\u4f53\uff1baddress\u5b57\u6bb5\u8868\u793a\u5f53\u524d\u6b63\u5728\u626b\u63cf\u5230\u7684\u865a\u62df\u5730\u5740\uff1brmap_list\u662f\u4e2a\u53cc\u6307\u9488\uff0c\u5b83\u6307\u5411\u4e00\u4e2a\u6307\u5411rmap_item\u7684\u6307\u9488\uff0c\u8868\u793a\u5728rmap_list\u4e2d\u4e0b\u4e00\u4e2a\u5c06\u88ab\u626b\u63cf\u7684rmap_item\uff1bseqnr\u8bb0\u4e0b\u5f53\u524d\u626b\u63cf\u6b21\u6570\u7684\u8ba1\u6570\u3002<\/p>\n

stable_node\u8868\u793aKSM\u7b97\u6cd5\u4e2d\u7a33\u5b9a\u6811\u7684\u7ed3\u70b9\u3002\u5b83\u7684\u5b9a\u4e49\u5982\u56fe3-7\u6240\u793a\uff1a<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe3-7 stable_node\u7684\u5b9a\u4e49<\/p>\n

 <\/p>\n

\u5176\u4e2d\uff0cnode\u5b57\u6bb5\u8868\u793a\u5728\u7a33\u5b9a\u6811\u4e2d\u7684\u54ea\u4e2a\u7ed3\u70b9\uff1bhlist\u94fe\u63a5\u4e86\u6240\u6709\u4f7f\u7528\u8be5\u7ed3\u70b9\u8868\u793a\u7684KSM\u9875\u9762\u7684rmap_items\uff1bkpfn\u5b57\u6bb5\u5219\u662f\u7269\u7406\u9875\u6846\u7684\u7f16\u53f7\u3002<\/p>\n

rmap_item\u662fKSM\u7b97\u6cd5\u4e2d\u6700\u91cd\u8981\u7684\u6570\u636e\u7ed3\u6784\u3002\u5982\u679c\u628a\u4ece\u865a\u62df\u5730\u5740\u5230\u9875\u9762\u7684\u6620\u5c04\u79f0\u4e4b\u4e3a\u6b63\u6620\u5c04\uff0c\u90a3\u4e48rmap_item\u662f\u4ece\u9875\u9762\u4fe1\u606f\u5230\u865a\u62df\u5730\u5740\u7684\u53cd\u5411\u6620\u5c04\u3002\u5b83\u7684\u5b9a\u4e49\u5982\u56fe3-8\u6240\u793a\uff1a<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe3-8 rmap_item\u7684\u5b9a\u4e49<\/p>\n

 <\/p>\n

\u5176\u4e2d\uff0crmap_list\u7528\u6765\u94fe\u63a5\u4e0a\u6587\u6307\u5230\u7684mm_slot\u7ed3\u6784\u4f53\u4e2d\u5c5e\u4e8e\u67d0\u5185\u5b58\u63cf\u8ff0\u7b26\u7684\u6240\u6709rmap_item\u94fe\u6210\u7684\u5355\u94fe\u8868\uff1banon_vma\u662f\u4e0e\u5185\u6838\u4e2d\u56de\u6536\u533f\u540d\u9875\u9762\u7684\u7b97\u6cd5\u76f8\u5173\u7684\u6570\u636e\u7ed3\u6784\uff0c\u4e0eKSM\u7b97\u6cd5\u5173\u7cfb\u4e0d\u5927\uff1bmm\u8868\u793a\u8be5\u53cd\u5411\u6620\u5c04rmap_item\u6240\u5c5e\u7684\u5185\u5b58\u63cf\u8ff0\u7b26\uff1baddress\u8868\u793a\u865a\u62df\u5730\u5740\uff1boldchecksum\u7528\u6765\u5b58\u50a8\u4e0a\u4e00\u6b21\u8ba1\u7b97\u7684\u6821\u9a8c\u548c\uff1bnode\u5b57\u6bb5\u7528\u5728\u5f53rmap_item\u5b58\u4e8e\u4e0d\u7a33\u5b9a\u6811\u4e2d\u65f6\u8868\u793a\u5728\u4e0d\u7a33\u5b9a\u6811\u4e2d\u7684\u7ed3\u70b9\uff1bhead\u5b57\u6bb5\u6307\u5411\u7a33\u5b9a\u6811\u4e2d\u7684\u7ed3\u70b9\uff1bhlist\u5b57\u6bb5\u7528\u6765\u94fe\u63a5\u6240\u6709\u5171\u4eab\u7a33\u5b9a\u6811\u4e2d\u67d0\u7ed3\u70b9\u7684KSM\u9875\u9762\u7684rmap_items\u3002<\/p>\n

<\/p>\n

\u56fe3-9 mm_slot\uff0crmap_item\uff0cmm_slots_hash<\/p>\n

 <\/p>\n

\u5982\u56fe3-9\u6240\u793a\uff0cmm_slots_hash\u662f\u4e00\u4e2a\u54c8\u5e0c\u6570\u7ec4\uff0c\u6bcf\u4e2a\u6570\u7ec4\u5143\u7d20\u5b58\u653e\u4e86\u4e00\u4e2a\u54c8\u5e0c\u94fe\u8868\u7684\u5934\u7ed3\u70b9\u3002\u6240\u6709\u7684mm_slot\u5728\u8ba1\u7b97\u54c8\u5e0c\u503c\u540e\u94fe\u63a5\u5230\u54c8\u5e0c\u6570\u7ec4\u7684\u76f8\u5e94\u7684\u54c8\u5e0c\u94fe\u8868\u4e0a\u3002\u540c\u65f6\uff0c\u6240\u6709\u7684mm_slot\u7528\u53cc\u94fe\u8868\u7ed3\u70b9\u4e24\u4e24\u94fe\u63a5\u6210\u4e00\u4e2a\u73af\u5f62\u94fe\u8868\u3002\u5bf9\u4e8e\u6bcf\u4e2amm_slot\uff0c\u5b83\u8fd8\u6709\u6240\u5c5e\u7684rmap_item\u94fe\u63a5\u5728mm_slot\u4e0a\u3002<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe3-10 rmap_item\u94fe\u63a5\u5728\u4e0d\u7a33\u5b9a\u6811\u4e0a<\/p>\n

 <\/p>\n

\u5982\u56fe3-10\u6240\u793a\uff0c\u4e0d\u7a33\u5b9a\u6811\u7684\u6811\u7ed3\u70b9\u5d4c\u5165\u5728rmap_item\u7ed3\u6784\u4f53\u4e2d\u3002\u6bcf\u4e2a\u4e0d\u7a33\u5b9a\u6811\u7684\u6811\u7ed3\u70b9\u5bf9\u5e94\u7684\u9875\u9762\u7531rmap_item\u8868\u793a\u3002<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe3-11 rmap_item\u94fe\u63a5\u5728\u7a33\u5b9a\u6811\u4e0a<\/p>\n

 <\/p>\n

\u5982\u56fe3-11\u6240\u793a\uff0c\u6bcf\u4e2a\u7a33\u5b9a\u6811\u7684\u6811\u7ed3\u70b9\u7ef4\u62a4\u4e86\u4e00\u4e2a\u94fe\u8868\u3002\u94fe\u8868\u94fe\u63a5\u4e86\u4f7f\u7528\u8be5\u7ed3\u70b9\u5bf9\u5e94\u7684KSM\u9875\u9762\u7684\u6240\u6709rmap_item\u3002<\/p>\n

3.4.2 \u5408\u5e76\u9875\u9762<\/h3>\n

<\/p>\n

\u56fe3-12 write_protect()\u51fd\u6570\u5173\u952e\u4ee3\u7801<\/p>\n

 <\/p>\n

KSM\u7b97\u6cd5\u4e2d\u6d89\u53ca\u5408\u5e76\u9875\u9762\u7684\u4e24\u4e2a\u6700\u5173\u952e\u7684\u51fd\u6570\u662fwrite_protect_page()\u548creplcace_page()\u3002\u5176\u4e2d\u524d\u4e00\u4e2a\u51fd\u6570\u4f20\u5165\u6307\u5b9a\u9875\u9762\u505a\u4e3a\u53c2\u6570\uff0c\u7136\u540e\u8be5\u51fd\u6570\u628a\u6307\u5411\u6307\u5b9a\u9875\u9762\u7684\u9875\u8868\u9879\u7684\u5199\u6807\u5fd7\u4f4d\u6e05\u6389\u3002\u7b2c\u4e8c\u4e2a\u51fd\u6570replace_page()\u6709\u4e24\u4e2a\u53c2\u6570\u5206\u522b\u6307\u5411\u4e24\u4e2a\u9875\u9762\uff0c\u8be5\u51fd\u6570\u82e5\u6267\u884c\u6210\u529f\u5219\u628a\u6307\u5411\u5176\u4e2d\u4e00\u4e2a\u9875\u9762\u7684\u9875\u8868\u9879\u6539\u4e3a\u6307\u5411\u7b2c\u4e8c\u4e2a\u9875\u9762\uff0c\u8fd9\u6837\u4fbf\u5b8c\u6210\u4e86\u5408\u5e76\u9875\u9762\u7684\u529f\u80fd\u3002<\/p>\n

\u56fe3-12\u6240\u793a\u4e3awrite_protect()\u51fd\u6570\u7684\u5173\u952e\u90e8\u5206\u4ee3\u7801\u3002\u4ee3\u78011-3\u884c\u8c03\u7528\u51fd\u6570page_check_address()\uff0c\u8be5\u51fd\u6570\u68c0\u67e5page\u6307\u5411\u7684\u9875\u9762\u662f\u5426\u5728\u5185\u5b58\u63cf\u8ff0\u7b26mm\u4e2d\u88ab\u6620\u5c04\u5230\u865a\u62df\u5730\u5740addr\u3002\u5982\u679c\u8be5\u51fd\u6570\u6210\u529f\uff0c\u5219\u8fd4\u56de\u5728\u5185\u5b58\u63cf\u8ff0\u7b26mm\u4e2d\u6307\u5411\u9875\u9762page\u7684\u9875\u8868\u9879\u7684\u6307\u9488\uff0c\u5e76\u4e14\u88ab\u81ea\u65cb\u9501\u9501\u5b9a\u3002\u4ee3\u7801\u884c5\u68c0\u67e5\u9875\u8868\u9879\u4e0a\u6709\u6ca1\u6709\u53ef\u5199\u6807\u5fd7\u6216\u8005\u6709\u810f\u4f4d\u3002\u5982\u679c\u6709\u53ef\u5199\u6807\u5fd7\uff0c\u90a3\u4e48\u5728\u63a5\u4e0b\u7684\u903b\u8f91\u4e2d\u5c31\u628a\u53ef\u5199\u6807\u5fd7\u64e6\u6389\uff0c\u5b8c\u6210\u5199\u4fdd\u62a4\uff1b\u5982\u679c\u9875\u8868\u9879\u4e0a\u6709\u810f\u4f4d\u5219\u9700\u8981\u6e05\u6389\u810f\u4f4d\u540e\u518d\u5199\u4fdd\u62a4\u3002\u7b2c8\u884c\u4ee3\u7801\u68c0\u67e5\u8be5\u9875\u9762\u662f\u5426\u88ab\u7f6e\u6362\u5230\u4e86\u4ea4\u6362\u5206\u533a\u3002\u6709\u4e00\u79cd\u60c5\u51b5\u6709\u5185\u5b58\u4e2d\u7684\u9875\u9762\u88ab\u7f6e\u6362\u5230\u4e86\u4ea4\u6362\u5206\u533a\uff0c\u4f46\u5185\u5b58\u4e2d\u7684\u9875\u9762\u5e76\u6ca1\u6709\u88ab\u7acb\u5373\u91ca\u653e\uff1b\u53e6\u4e00\u79cd\u60c5\u51b5\u662f\u4ea4\u6362\u5206\u533a\u7684\u9875\u9762\u88ab\u91cd\u65b0\u5524\u5165\u4e86\u5185\u5b58\uff0c\u800c\u4ea4\u6362\u5206\u533a\u4e2d\u7684\u9875\u9762\u4ecd\u7136\u6709\u6548\u3002\u5bf9\u4e8e\u8fd9\u4e24\u79cd\u60c5\u51b5\uff0c\u4e00\u4e2a\u9875\u9762\u5728\u5185\u5b58\u548c\u4ea4\u6362\u5206\u533a\u4e2d\u90fd\u62e5\u6709\u4e00\u4efd\u62f7\u8d1d\u3002\u4ee3\u7801\u884c9\u6e05\u7a7a\u5904\u7406\u5668\u9ad8\u901f\u7f13\u51b2\u533a\u548c\u9875\u9762page\u6709\u5173\u7684\u7f13\u51b2\u3002\u4ee3\u7801\u884c10\u6e05\u7a7a\u6307\u5b9a\u7684\u9875\u8868\u9879\u5e76\u6e05\u7a7a\u5904\u7406\u5668\u4e2d\u7684\u65c1\u8def\u8f6c\u6362\u7f13\u51b2\uff0c\u8be5\u51fd\u6570\u8fd4\u56de\u6e05\u7a7a\u8be5\u9875\u8868\u9879\u524d\u7684\u539f\u6765\u7684\u9875\u8868\u9879\u3002\u4ee3\u7801\u884c11-14\u68c0\u67e5\u5f53\u524d\u662f\u5426\u6709\u5728\u8fd9\u4e2a\u9875\u9762\u4e0a\u7684I\/O\uff0c\u5982\u679c\u662f\uff0c\u5219\u628a\u4ee5\u524d\u7684\u9875\u8868\u9879\u8bbe\u56de\uff0c\u9000\u51fawrite_protect()\u51fd\u6570\uff0c\u5199\u4fdd\u62a4\u5931\u8d25\u3002\u7b2c15\uff0c16\u884c\u4ee3\u7801\u68c0\u67e5\u65e7\u9875\u8868\u9879\u662f\u5426\u7f6e\u810f\u4f4d\uff0c\u5982\u679c\u662f\u5219\u628a\u9875page\u7f6e\u810f\u4f4d\u3002\u7b2c17,18\u884c\u4ee3\u7801\u5199\u4fdd\u62a4\u65b0\u7684\u9875\u8868\u9879\u5e76\u6e05\u6389\u9875\u8868\u9879\u4e0a\u7684\u810f\u4f4d\uff0c\u7136\u540e\u628a\u65b0\u7684\u9875\u8868\u9879\u5199\u5165\u9875\u8868\u3002\u6b64\u65f6\uff0cwrite_protect()\u51fd\u6570\u6210\u529f\u3002<\/p>\n

\u56fe3-13\u662freplace_page()\u51fd\u6570\u7684\u5173\u952e\u90e8\u5206\u4ee3\u7801\uff0c\u5b83\u5b8c\u6210\u5408\u5e76\u9875\u9762\u903b\u8f91\u3002\u8be5\u51fd\u6570\u63a5\u53d7\u7684\u5176\u4e2d\u4e24\u4e2a\u53c2\u6570\u8868\u793a\u4e24\u4e2a\u9875\u9762\uff0c\u4e00\u4e2a\u662fpage\uff0c\u5b83\u7684\u9875\u8868\u9879\u5728\u5408\u5e76\u540e\u4f1a\u88ab\u6539\u5199\uff0c\u53e6\u4e00\u4e2a\u662fkpage\uff0c\u5728\u5408\u5e76\u540e\uff0cpage\u5bf9\u5e94\u7684\u9875\u8868\u9879\u4f1a\u548ckpage\u6307\u5411\u76f8\u540c\u7684\u9875\u9762\u3002\u7b2c1\u884c\u4ee3\u7801\u8c03\u7528pte_offset_map_lcok()\u5f97\u5230\u5728\u5185\u5b58\u63cf\u8ff0\u7b26mm\u4e2d\u7684\u865a\u62df\u5730\u5740\u4e3aaddr\u7684\u5bf9\u5e94\u9875\u8868\u9879\uff0c\u5e76\u7528\u81ea\u65cb\u9501\u9501\u5b9a\u3002\u5b83\u7684\u529f\u80fd\u7c7b\u4f3cpage_check_address()\u51fd\u6570\u3002\u7b2c2-4\u884c\u68c0\u67e5\u5f85\u5408\u5e76\u7684\u4e24\u4e2a\u9875\u8868\u9879\u662f\u5426\u662f\u540c\u4e00\u9875\u8868\u9879\uff0c\u5982\u679c\u662f\uff0c\u5219\u4e0d\u9700\u8981\u5408\u5e76\u3002\u7b2c7\u884c\u589e\u52a0kpage\u9875\u9762\u7684\u5f15\u7528\u8ba1\u6570\u3002\u7b2c8\u884c\u7ef4\u62a4\u4e86\u4e00\u4e2a\u7528\u4e8e\u4ece\u9875\u9762\u5230\u865a\u62df\u5730\u5740\u7684\u9006\u6620\u5c04\u7684\u6570\u636e\u7ed3\u6784\uff0c\u4e0eKSM\u7b97\u6cd5\u65e0\u76f4\u63a5\u5173\u8054\u3002\u7b2c10\uff0c11\u884c\u4ee3\u7801\u6e05\u7a7apage\u9875\u9762\u5bf9\u5e94\u7684\u9ad8\u901f\u7f13\u51b2\u548c\u65c1\u8def\u8f6c\u6362\u7f13\u51b2\uff0c\u4e0ewrite_protect()\u51fd\u6570\u4e2d\u7684\u7528\u6cd5\u4e00\u6837\u3002\u7b2c12\u884c\u4ee3\u7801\u5b8c\u6210\u5408\u5e76\u7684\u52a8\u4f5c\uff0c\u539f\u5148\u6307\u5411page\u7684\u9875\u8868\u9879\u4e5f\u6307\u5411kpage\u3002\u7b2c14-17\u884c\u4ee3\u7801\u5b8c\u6210\u91ca\u653epage\u7684\u903b\u8f91\u3002\u7b2c19\u884c\u4ee3\u7801\u7ed9\u521a\u88ab\u6539\u5199\u7684\u9875\u8868\u9879\u89e3\u9501\u3002<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe3-13 replace_page()\u5173\u952e\u4ee3\u7801<\/p>\n

 <\/p>\n

3.5 \u672c\u7ae0\u5c0f\u7ed3<\/h2>\n

\u672c\u7ae0\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5982\u4f55\u4f7f\u7528Linux\u5185\u6838\u7684KSM\u6a21\u5757\uff0c\u8be5\u6a21\u5757\u7684\u8bbe\u8ba1\u601d\u8def\u4ee5\u53ca\u4e3b\u8981\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5e76\u5206\u6790\u4e86KSM\u4e2d\u6700\u6838\u5fc3\u7684\u4ee3\u7801\u3002<\/p>\n

 <\/p>\n

\u7b2c\u56db\u7ae0 KSM+\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0<\/h1>\n

4.1 KSM+\u7684\u8bbe\u8ba1<\/h2>\n

      KSM+\u662f\u5728KSM\u7684\u57fa\u7840\u4e0a\u9488\u5bf9\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u7684\u5e94\u7528\u573a\u666f\u800c\u8bbe\u8ba1\u5f00\u53d1\u7684\u5408\u5e76\u5185\u5b58\u9875\u9762\u5de5\u5177\u3002\u672c\u8282\u4ecb\u7ecdKSM+\u7684\u8bbe\u8ba1\u601d\u8def\u548c\u6700\u6838\u5fc3\u7684\u7b97\u6cd5\u3002<\/p>\n

4.1.1 KSM+\u7684\u8bbe\u8ba1\u76ee\u6807<\/h3>\n

KSM+\u4e3b\u8981\u9488\u5bf9\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\uff0c\u800cKSM\u4e3b\u8981\u9488\u5bf9\u57fa\u4e8eKVM\u7684\u865a\u62df\u673a\u73af\u5883\u3002\u8fd9\u4e24\u79cd\u73af\u5883\u4e3b\u8981\u6709\u4e24\u4e2a\u533a\u522b\uff1a\u7b2c\u4e00\uff0cKVM\u5728\u6e90\u4ee3\u7801\u7ea7\u522b\u901a\u77e5KSM\u5408\u5e76\u54ea\u4e9b\u5185\u5b58\uff0c\u800c\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u9664\u975e\u66f4\u6539\u6e90\u4ee3\u7801\u540e\u91cd\u65b0\u7f16\u8bd1\u624d\u80fd\u4f7f\u7528KSM\uff0c\u6216\u8005\u4f7f\u7528\u94a9\u5b50\u6280\u672f\u622a\u83b7\u7a0b\u5e8f\u5bf9\u5185\u5b58\u7684\u7533\u8bf7\u518d\u4f5c\u76f8\u5e94\u7684\u4e0eKSM\u7684\u4ea4\u4e92\u5904\u7406\uff0c\u4f46\u5b9e\u73b0\u8fd9\u79cd\u65b9\u6848\u4e5f\u4e0d\u7b80\u5355\u3002\u7b2c\u4e8c\uff0c\u865a\u62df\u673a\u4e4b\u95f4\u6709\u5927\u91cf\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\uff0c\u800c\u8f83\u4e4b\u865a\u62df\u673a\u73af\u5883\uff0c\u4e00\u822c\u7684\u684c\u9762\u5e94\u7528\u6ca1\u6709\u5927\u91cf\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\u3002\u56e0\u6b64\uff0cKSM\u5982\u679c\u4e0d\u4f5c\u6539\u52a8\u5730\u8fd0\u7528\u5728\u684c\u9762\u573a\u666f\u4e0b\u4f1a\u5b58\u5728\u4e24\u4e2a\u95ee\u9898\u3002\u7b2c\u4e00\uff0c\u5e94\u7528\u7a0b\u5e8f\u901a\u77e5KSM\u9700\u8981\u5408\u5e76\u7684\u5185\u5b58\u533a\u57df\u975e\u5e38\u56f0\u96be\u3002\u7b2c\u4e8c\uff0cKSM\u539f\u6709\u7684\u626b\u63cf\u7b97\u6cd5\u5bf9\u626b\u63cf\u8fc7\u7684\u6bcf\u4e00\u4e2a\u9875\u9762\u90fd\u751f\u6210\u4e00\u4e2armap_item\u7ed3\u6784\u4f53\uff0c\u800c\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u9875\u9762\u6bd4\u8f83\u5c11\uff0c\u90a3\u4e48KSM\u5bf9\u5927\u91cf\u4e0d\u80fd\u5408\u5e76\u6210\u529f\u7684\u9875\u9762\u751f\u6210rmap_item\u7ed3\u6784\u4f53\u975e\u4f46\u4e0d\u80fd\u8282\u7701\u5185\u5b58\uff0c\u76f8\u53cd\u8fd8\u6d6a\u8d39\u4e86\u5185\u5b58\u3002\u56e0\u6b64\uff0cKSM+\u7684\u8bbe\u8ba1\u76ee\u6807\u4ea6\u4e3a\u4e24\u70b9\uff1a\u7b2c\u4e00\uff0c\u7528\u6237\u7a7a\u95f4\u6613\u4e8e\u901a\u77e5KSM+\u9700\u8981\u626b\u63cf\u7684\u5185\u5b58\u533a\u57df\u3002\u7b2c\u4e8c\uff0cKSM+\u7684\u626b\u63cf\u7b97\u6cd5\u65e2\u80fd\u5728\u91cd\u590d\u5185\u5b58\u9875\u9762\u8f83\u5c11\u7684\u5185\u5b58\u4e2d\u627e\u5230\u9700\u8981\u5408\u5e76\u7684\u9875\u9762\uff0c\u53c8\u80fd\u591f\u6700\u5927\u9650\u5ea6\u5730\u51cf\u5c11\u81ea\u8eab\u7684\u5185\u5b58\u6d88\u8017\u3002<\/p>\n

4.1.2 \u65b0\u7684\u7528\u6237\u4ea4\u4e92\u65b9\u5f0f<\/h3>\n

KSM+\u8fbe\u5230\u7b2c\u4e00\u4e2a\u8bbe\u8ba1\u76ee\u6807\u7684\u89e3\u51b3\u65b9\u6848\u76f8\u5bf9\u7b80\u5355\uff0c\u901a\u8fc7\u6269\u5c55KSM\u4f7f\u7528\u7684sysfs\u6587\u4ef6\u7cfb\u7edf\uff0c\u52a0\u5165\u4e86\u8ba9\u7528\u6237\u6307\u5b9a\u548c\u64a4\u9500\u626b\u63cf\u67d0\u7a0b\u5e8f\u7684\u529f\u80fd\u3002\u7528\u6237\u7a7a\u95f4\u53ef\u4ee5\u901a\u8fc7sysfs\u6587\u4ef6\u7cfb\u7edf\u901a\u77e5KSM+\u9700\u8981\u626b\u63cf\u54ea\u4e2a\u7a0b\u5e8f\u7684\u5185\u5b58\u3002<\/p>\n

KSM+\u8bbe\u8ba1\u5177\u4f53\u4ea4\u4e92\u65b9\u5f0f\u4e3a\uff1a\u7528\u6237\u901a\u8fc7\u64cd\u4f5csysfs\u6587\u4ef6\u7cfb\u7edf\u4e0a\u4f4d\u4e8e\u4f4d\u7f6e\/sys\/kernel\/ksm+\/processes_to_scan\u7684\u6587\u4ef6\uff0c\u901a\u77e5KSM+\u9700\u8981\u626b\u63cf\u548c\u64a4\u6d88\u626b\u63cf\u54ea\u4e9b\u7a0b\u5e8f\u3002\u7ea6\u5b9a\u7684\u64cd\u4f5c\u65b9\u5f0f\u662f\uff1a\u5199\u5165\u5b57\u7b26\u4e32“+ app_name”\uff0c\u5219\u4f1a\u626b\u63cf\u7a0b\u5e8f\u540d\u4e3aapp_name\u7684\u6240\u6709\u8fdb\u7a0b\uff1b\u5199\u5165\u5b57\u7b26\u4e32“- app_name”\u5219\u64a4\u6d88\u626b\u63cf\u7a0b\u5e8f\u540d\u4e3aapp_name\u7684\u6240\u6709\u8fdb\u7a0b\u3002\u6bd4\u5982\uff0c\u7528\u6237\u53ef\u4ee5\u65b9\u4fbf\u5730\u4f7f\u7528echo “+ app_name”  > \/sys\/kernel\/ksm+\/processes_to_scan\u901a\u77e5KSM\u626b\u63cfapp_name\u7a0b\u5e8f<\/p>\n

4.1.3 \u65b0\u7684\u626b\u63cf\u7b97\u6cd5<\/h3>\n

\u4e3a\u4e86\u8fbe\u62104.1.1\u4e2d\u63d0\u5230\u7684\u7b2c\u4e8c\u4e2a\u76ee\u6807\uff0cKSM+\u9700\u8981\u5bf9KSM\u539f\u6709\u7684\u626b\u63cf\u7b97\u6cd5\u505a\u8f83\u5927\u7684\u6539\u52a8\u3002KSM\u7684\u63cf\u8ff0\u7b97\u6cd5\u4f9d\u8d56\u6307\u5b9a\u7684\u5730\u5740\u7a7a\u95f4\u5b58\u5728\u9ad8\u5bc6\u5ea6\u7684\u91cd\u590d\u5185\u5bb9\u7684\u9875\u9762\u3002\u5206\u6790KSM\u7684scan_get_next_rmap_item()\u51fd\u6570\uff0c\u53ef\u4ee5\u770b\u5230KSM\u5c3d\u529b\u4e3a\u6bcf\u4e00\u4e2a\u9875\u9762\u5206\u914d\u4e00\u4e2armap_item\u7ed3\u6784\u4f53\uff0c\u5982\u679c\u8be5\u9875\u9762\u4e0d\u80fd\u5408\u5e76\uff0c\u90a3\u4e48\u4e0d\u4ec5\u6ca1\u6709\u51cf\u5c11\u5185\u5b58\u4f7f\u7528\uff0c\u76f8\u53cd\u8fd8\u589e\u52a0\u4e86\u4e00\u4e2armap_item\u7ed3\u6784\u4f53\u5927\u5c0f\u7684\u5185\u5b58\u5f00\u9500\u3002\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u9700\u8981\u91c7\u6837\u53e6\u5916\u4e00\u79cdrmap_item\u7684\u751f\u6210\u7b97\u6cd5\uff0c\u5bf9\u4e8e\u5408\u5e76\u4e0d\u6210\u529f\u7684rmap_item\uff0c\u80fd\u591f\u56de\u6536\u8be5rmap_item\u3002<\/p>\n

\u8003\u8651\u5230\u4e0d\u540c\u7684VMA\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u5bc6\u5ea6\u57fa\u672c\u4e0a\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u9488\u5bf9\u4e0d\u540c\u7684VMA\uff0c KSM+\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u4e0d\u540c\u7684\u7b56\u7565\u751f\u6210rmap_item\u3002\u56e0\u6b64\uff0cKSM+\u4f7f\u7528\u7684\u65b0\u626b\u63cf\u7b97\u6cd5\u505a\u7684\u7b2c\u4e00\u4e2a\u6539\u52a8\u5c31\u662f\u4e3a\u6bcf\u4e2aVMA\u8bbe\u7f6e\u4e00\u4e2a\u6570\u636e\u7ed3\u6784\u3002\u8f83\u4e4bKSM\u4f7f\u7528\u7684\u6570\u636e\u7ed3\u6784\uff0cKSM+\u5728mm_slot\u548crmap_list\u4e4b\u95f4\u5f15\u5165\u4e86\u4e00\u4e2a\u65b0\u7684\u7ef4\u62a4VMA\u76f8\u5173\u6570\u636e\u7684\u7ed3\u6784\u4f53vma_node\u3002\u539f\u6765\u7684\u7b97\u6cd5\u628armap_item\u6302\u63a5\u5230\u5bf9\u5e94\u7684mm_slot\uff0c\u5373mm_slot\uff0crmap_item\u4e24\u7ea7\u6570\u636e\u7ed3\u6784\u3002\u52a0\u5165vma_node\u7ed3\u6784\u4f53\u540e\uff0c\u6bcf\u4e2amm_slot\u7ef4\u62a4\u4e00\u68f5\u7ea2\u9ed1\u6811\uff0c\u6811\u4e2d\u94fe\u63a5\u4e86vma_node\uff0c\u800cvma_node\u7ef4\u62a4\u4e86\u4e00\u4e2a\u94fe\u8868\uff0c\u94fe\u8868\u4e2d\u94fe\u63a5\u4e86rmap_item\uff0c\u5373mm_slot\uff0cvma_node\uff0crmap_item\u4e09\u7ea7\u6570\u636e\u7ed3\u6784\u3002\u5b83\u4eec\u7684\u5173\u7cfb\u5982\u56fe4-1\u6240\u793a\u3002<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe4-1 KSM+\u7684\u4e09\u7ea7\u6570\u636e\u7ed3\u6784<\/p>\n

<\/p>\n

\u56fe4-2 VMA\u7684\u91c7\u6837\u7b97\u6cd5<\/p>\n

 <\/p>\n

KSM+\u7684\u626b\u63cf\u7b97\u6cd5\u7684\u4e3b\u8981\u90e8\u5206\u5728vma_node_do_sampling()\u51fd\u6570\u4e2d\u3002\u8be5\u51fd\u6570\u5bf9VMA\u8fdb\u884c\u91c7\u6837\uff0c\u751f\u6210rmap_item\u3002\u8be5\u51fd\u6570\u7b80\u5316\u540e\u7684\u903b\u8f91\u5982\u56fe4-2\u6240\u793a\uff0c\u5b83\u4e3b\u8981\u505a\u4e09\u4ef6\u4e8b\u60c5\uff1a\u7b2c\u4e00\uff0c\u91c7\u6837\u503c\u5f97\u5c1d\u8bd5\u8fdb\u884c\u5408\u5e76\u7684\u9875\u9762\u5e76\u751f\u6210rmap_item\u7ed3\u6784\u4f53\uff1b\u7b2c\u4e8c\uff0c\u9500\u6bc1\u672a\u80fd\u591f\u5408\u5e76\u6210\u529f\u7684\u9875\u9762\u5bf9\u5e94\u7684rmap_item\uff0c\u56e0\u4e3aKSM\u5728\u626b\u63cf\u91cd\u590d\u9875\u9762\u5e76\u4e0d\u591a\u7684\u865a\u62df\u5185\u5b58\u533a\u57df\u65f6\u4e3a\u751f\u6210\u7684\u4e00\u4e9brmap_item\u672c\u8eab\u6d88\u8017\u4e86\u4e00\u4e9b\u5185\u5b58\uff0c\u5982\u679c\u4e0d\u56de\u6536\u8fd9\u90e8\u5206\u5185\u5b58\uff0c\u4f1a\u5927\u5927\u62b5\u6d88KSM \u5408\u5e76\u540e\u8282\u7701\u7684\u5185\u5b58\uff1b\u7b2c\u4e09\uff0c\u5982\u679c\u63a2\u6d4b\u5230\u57fa\u672c\u4e0a\u6ca1\u6709\u592a\u5927\u5e0c\u671b\u5b58\u5728\u53ef\u5408\u5e76\u5185\u5b58\u9875\u7684VMA\uff0c\u5219\u628a\u5bf9\u5e94\u7684vma_node\u56de\u6536\uff0c\u8282\u7701\u4e86\u626b\u63cf\u8fd9\u4e2aVMA\u7684\u6240\u9700\u8981\u7684\u5904\u7406\u5668\u548c\u5185\u5b58\u8d44\u6e90\u3002<\/p>\n

\u51fd\u6570vma_node_do_sampling()\u4e2d\u7684\u91c7\u6837\u903b\u8f91\u90e8\u5206\u4f7f\u7528\u4e86\u7ed3\u6784\u4f53vma_node\u7684\u4e00\u4e2a\u91cd\u8981\u7684\u53d8\u91cf\uff0c\u91c7\u6837\u7cfb\u6570\uff1acoefficient\u3002\u8be5\u7cfb\u6570\u53d61\u5230100\u4e4b\u95f4\u7684\u4e00\u4e2a\u503cn\uff0c\u8868\u793avma_node\u5bf9\u5e94\u7684VMA\u4e2d\u6709n%\u7684\u9875\u9762\u5c06\u88ab\u91c7\u6837\uff0c\u5982\u679cn \u4e3a100 \uff0c\u5219VMA\u4e2d\u6240\u6709\u7684\u9875\u9762\u5c06\u88ab\u91c7\u6837\u3002\u91c7\u6837\u903b\u8f91\u6839\u636e\u91c7\u6837\u7cfb\u6570\u8ba1\u7b97\u51fa\u9700\u8981\u91c7\u6837\u591a\u5c11\u4e2a\u9875\u9762m\uff0c\u518d\u628a\u865a\u62df\u5185\u5b58\u533a\u57df\u5e73\u5747\u5206\u6210m\u4e2a\u533a\u95f4\uff0c\u7136\u540e\u5728\u6bcf\u4e2a\u533a\u95f4\u4e2d\u968f\u673a\u53d6\u4e00\u4e2a\u9875\u9762\u3002KSM+\u8bbe\u5b9a\u521d\u59cb\u91c7\u6837\u7cfb\u6570\u662f100\uff0c\u5373\u91c7\u6837VMA\u4e2d\u7684\u6240\u6709\u9875\u9762\uff0c\u7136\u540e\u5728\u6bcf\u8f6e\u91c7\u6837\u540e\u7ed9\u91c7\u6837\u7cfb\u6570\u51cf\u5c11\u4e00\u5b9a\u7684\u503c\uff0c\u8fd9\u6837\u6bcf\u6b21\u91c7\u6837\u5c31\u4f1a\u6bd4\u4e0a\u6b21\u91c7\u6837\u65f6\u9009\u5230\u7684\u9875\u9762\u8981\u5c11\u3002\u56e0\u4e3a\u524d\u51e0\u8f6e\u7684\u91c7\u6837\u7cfb\u6570\u8f83\u9ad8\uff0c\u6240\u4ee5\u5927\u90e8\u5206\u91cd\u590d\u9875\u9762\u90fd\u4f1a\u5728\u524d\u51e0\u8f6e\u91c7\u6837\u4e2d\u88ab\u9009\u4e2d\uff0c\u968f\u540e\u88ab\u5408\u5e76\u3002\u524d\u51e0\u8f6e\u9ad8\u5bc6\u5ea6\u7684\u91c7\u6837\u8fc7\u540e\u4f1a\u8fdb\u5165\u4f4e\u5bc6\u5ea6\u7684\u91c7\u6837\uff0c\u8fd9\u6837\u53c8\u80fd\u4f7f\u4e00\u4e9b\u5185\u5bb9\u6709\u53d8\u5316\u7684\u9875\u9762\u6709\u673a\u4f1a\u88ab\u9009\u4e2d\u8fdb\u884c\u5408\u5e76\u64cd\u4f5c\u3002<\/p>\n

\u51fd\u6570vma_node_do_sampling()\u4e2d\u56de\u6536rmap_item\u7684\u7b97\u6cd5\u662f\uff1a\u5bf9\u4e8e\u672c\u8f6e\u91c7\u6837\u5230\u7684rmap_item\uff0c\u65e0\u6761\u4ef6\u52a0\u5165vma_node\u7ef4\u62a4\u7684rmap_item\u94fe\u8868\uff1b\u5bf9\u4e8e\u4e0a\u8f6e\u91c7\u6837\u4e2d\u7684rmap_item\uff0c\u5982\u679c\u5df2\u7ecf\u627e\u5230\u4e86\u53ef\u4ee5\u5408\u5e76\u7684\u76f8\u540c\u5185\u5bb9\u9875\u9762\uff0c\u5373\u8be5rmap_item\u94fe\u63a5\u5230\u4e86\u7a33\u5b9a\u6811\u4e2d\uff0c\u5c31\u4fdd\u7559\u8be5rmap_item\uff1b\u5982\u679c\u65e2\u4e0d\u5728\u7a33\u5b9a\u6811\u4e2d\uff0c\u800c\u4e14\u4e0d\u88ab\u672c\u8f6e\u91c7\u6837\u547d\u4e2d\uff0c\u5219\u9500\u6bc1\u8be5rmap_item\u3002vma_node\u7ef4\u62a4\u7684rmap_item\u94fe\u8868\u7684\u7ed3\u70b9\u6309\u7167\u865a\u62df\u5730\u5740\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\uff0c\u9500\u6bc1rmap_item\u7684\u7b97\u6cd5\u53ea\u9700\u8981\u904d\u5386\u4e00\u6b21rmap_item\u94fe\u8868\uff0c\u5b83\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e0e\u94fe\u8868\u7684\u957f\u5ea6\u662f\u7ebf\u6027\u7684\u5173\u7cfb\u3002<\/p>\n

KSM+\u7684\u626b\u63cf\u7b97\u6cd5\u505a\u7684\u7b2c\u4e09\u4ef6\u4e8b\u662f\u9500\u6bc1vma_node\u7684\u903b\u8f91\u3002\u51fd\u6570vma_node_do_sampling()\u5728\u6bcf\u5b8c\u6210\u4e00\u8f6e\u91c7\u6837\u540e\uff0c\u5224\u65ad\u672c\u8f6e\u91c7\u6837\u8fc7\u540e\u662f\u5426\u6709rmap_item\u5904\u5728\u7a33\u5b9a\u6811\u4e2d\uff0c\u5982\u679c\u6ca1\u6709rmap_item\u5728\u7a33\u5b9a\u6811\u4e2d\u4e14\u91c7\u6837\u7cfb\u6570coefficient\u4e0b\u964d\u5230\u4e86\u4e00\u5b9a\u9600\u503c\uff0c\u5219\u628a\u63cf\u8ff0\u5bf9\u5e94\u7684\u865a\u62df\u5185\u5b58\u7a7a\u95f4\u7684\u7ed3\u6784\u4f53vm_area_struct\u4e2d\u7684\u6807\u5fd7\u5b57\u6bb5vm_flags\u7f6eVM_NOT_MERGEABLE\u4f4d\u3002VM_NOT_MERGEABLE\u6807\u5fd7\u4f4d\u662f\u672c\u5de5\u7a0b\u81ea\u5b9a\u4e49\u7684\u6807\u5fd7\uff0c\u8868\u793a\u67d0vm_area_struct\u5c06\u4e0d\u88abKSM\u91c7\u6837\u3002\u8be5\u6807\u5fd7\u88ab\u6dfb\u52a0\u5728\u5185\u6838\u6e90\u4ee3\u7801\/include\/linux\/mm.h\u6587\u4ef6\u4e2d\u3002KSM\u904d\u5386\u6240\u6709vma_node\u7684\u65f6\u5019\uff0c\u4ee3\u7801\u5c06\u68c0\u67e5\u5230VM_NOT_MERGEABLE\u6807\u5fd7\u4f4d\uff0c\u4e8e\u662f\u628avma_node\u4ecemm_slot\u4e2d\u5220\u9664\u3002<\/p>\n

4.1.4 KSM+\u7684\u6027\u80fd <\/h3>\n

      \u4ece\u7406\u8bba\u4e0a\u5206\u6790\uff0cKSM+\u548cKSM\u5728\u6bd4\u8f83\u4e24\u4e2a\u9875\u9762\u662f\u5426\u76f8\u540c\u65f6\u4f7f\u7528\u540c\u6837\u7684\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u7684\u6027\u80fd\u57283.3.4\u5c0f\u8282\u6709\u8f83\u8be6\u7ec6\u7684\u5206\u6790\u3002\u7a33\u5b9a\u6811\u548c\u4e0d\u7a33\u5b9a\u6811\u4e5f\u4ecd\u7136\u662f\u6700\u4e3b\u8981\u7684\u6570\u636e\u7ed3\u6784\uff0c\u6240\u4ee5KSM+\u5bf9KSM\u7684\u6574\u4f53\u6027\u80fd\u57fa\u672c\u4e00\u81f4\u3002\u8003\u8651\u6700\u4e3b\u8981\u7684\u4e24\u5927\u4fee\u6539\u90e8\u5206\uff0c\u65b0\u7684\u7528\u6237\u4ea4\u4e92\u65b9\u5f0f\u53ea\u662f\u7528\u6765\u901a\u77e5KSM+\u9700\u8981\u626b\u63cf\u7684\u533a\u57df\uff0c\u5bf9\u6027\u80fd\u51e0\u4e4e\u6ca1\u6709\u5f71\u54cd\u3002\u518d\u8003\u8651KSM+\u91c7\u7528\u7684\u65b0\u7684\u626b\u63cf\u7b97\u6cd5\uff0cKSM\u4f9d\u6b21\u4e3a\u9700\u8981\u626b\u63cf\u7684\u5185\u5b58\u533a\u57df\u4e2d\u7684\u6bcf\u4e2a\u9875\u9762\u751f\u6210rmap_item\uff0c\u800cKSM+\u6839\u636e\u91c7\u6837\u7cfb\u6570\u751f\u6210rmap_item\u3002\u5f53\u91c7\u6837\u7cfb\u6570\u4e0d\u4e3a100\u65f6\uff0cKSM+\u751f\u6210\u7684rmap_item\u8981\u6bd4KSM\u751f\u6210\u7684rmap_item\u8981\u5c11\u3002\u800c\u91c7\u6837\u7cfb\u6570\u4ee5\u67d0\u4e2a\u6570\u503c\u4e3a\u6b65\u957f\uff0c\u4ece100\u9012\u51cf\uff0c\u8fd9\u610f\u5473\u7740\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u626b\u63cf\u540c\u6837\u5927\u5c0f\u7684\u5185\u5b58\u533a\u57df\uff0cKSM+\u751f\u6210\u7684rmap_item\u6bd4KSM\u5c11\uff0c\u56e0\u6b64KSM+\u7684\u65f6\u95f4\u6548\u7387\u8981\u4f18\u4e8eKSM\u3002<\/p>\n

       KSM+\u5bf9\u7cfb\u7edf\u7684\u6027\u80fd\u5f71\u54cd\u4e0eKSM\u4e00\u6837\uff0c\u4e3b\u8981\u53d6\u51b3\u4e8e\u4e24\u4e2a\u53c2\u6570\uff0c\u4e00\u4e2a\u662f\u4e24\u6b21\u626b\u63cf\u4e4b\u95f4\u7684\u65f6\u95f4\u95f4\u9694\uff0c\u53e6\u4e00\u4e2a\u662f\u6bcf\u6b21\u626b\u63cf\u7684\u9875\u9762\u6570\u91cf\u3002\u8fd9\u4e24\u4e2a\u53c2\u6570\u5b9e\u9645\u4e0a\u90fd\u53ef\u4ee5\u901a\u8fc7sysfs\u6587\u4ef6\u7cfb\u7edf\u8fdb\u884c\u8c03\u6574\uff0c\u4e24\u6b21\u626b\u63cf\u4e4b\u95f4\u7684\u65f6\u95f4\u95f4\u9694\u8d8a\u77ed\uff0c\u6bcf\u6b21\u626b\u63cf\u7684\u9875\u9762\u6570\u91cf\u8d8a\u591a\uff0c\u5219KSM+\u5bf9\u7cfb\u7edf\u7684\u6027\u80fd\u5f71\u54cd\u8d8a\u5927\uff0c\u53cd\u4e4b\u8d8a\u5c0f\u3002<\/p>\n

4.2 KSM+\u7684\u5b9e\u73b0<\/h2>\n

      \u672c\u8282\u4ecb\u7ecd\u5b9e\u73b0KSM+\u7684\u5173\u952e\u4ee3\u7801\uff0c\u5b83\u5305\u62ec\u65b0\u7684\u7528\u6237\u4ea4\u4e92\u65b9\u5f0f\u548c\u65b0\u7684\u626b\u63cf\u7b97\u6cd5\u4e24\u90e8\u5206\u3002<\/p>\n

4.2.1 \u7528\u6237\u4ea4\u4e92\u65b9\u5f0f\u7684\u6838\u5fc3\u4ee3\u7801<\/h3>\n

      KSM+\u4e2d\u7528\u4e00\u4e2a\u5faa\u73af\u94fe\u8868\u7ef4\u62a4\u9700\u8981\u626b\u63cf\u7684\u7a0b\u5e8f\u3002\u7528\u6237\u901a\u77e5\u626b\u63cf\u67d0\u7a0b\u5e8f\u65f6\uff0c\u7a0b\u5e8f\u540d\u88ab\u52a0\u5165\u5230\u5faa\u73af\u94fe\u8868\uff0c\u7528\u6237\u901a\u77e5\u53d6\u6d88\u626b\u63cf\u67d0\u7a0b\u5e8f\u65f6\uff0c\u7a0b\u5e8f\u540d\u4ece\u5faa\u73af\u94fe\u8868\u4e2d\u5220\u9664\u3002\u5bf9\u5e94\u7684\u6838\u5fc3\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n

struct process_to_scan *pts;      \/\/ \u4e00\u4e2a\u8bb0\u8f7d\u7a0b\u5e8f\u540d\u7684\u7ed3\u6784\u4f53\u7684\u6307\u9488<\/p>\n

sscanf(buf, "%c %s", &op, comm);   \/\/ \u5904\u7406\u683c\u5f0f“+ \u7a0b\u5e8f\u540d”<\/p>\n

      len = strlen(comm);       \/\/ \u5f97\u5230\u7a0b\u5e8f\u540d\u7684\u957f\u5ea6<\/p>\n

spin_lock(&processes_to_scan_lock);  \/\/ \u5f97\u5230\u64cd\u4f5c\u5faa\u73af\u53cc\u94fe\u8868\u7684\u81ea\u65cb\u9501<\/p>\n

exist = process2scan_exist(comm);  \/\/ \u662f\u5426\u5df2\u7ecf\u5b58\u5728\u8fd9\u4e2a\u7a0b\u5e8f\u540d<\/p>\n

if (op == '+' && !exist)   \/\/ \u5f53\u64cd\u4f5c\u662f+\uff0c\u7a0b\u5e8f\u540d\u53c8\u672a\u88ab\u8bb0\u8f7d\u65f6<\/p>\n

{<\/p>\n

pts = alloc_process_to_scan();  \/\/ \u5206\u914d\u4e00\u4e2aprocess_to_scan\u7684\u7ed3\u6784\u4f53<\/p>\n

pts->comm = kmalloc(len+1, GFP_KERNEL); \/\/ \u5206\u914d\u5185\u5b58\u5b58\u4e0b\u6587\u4ef6\u540d<\/p>\n

if (!pts->comm) {   \/\/ \u6781\u7aef\u60c5\u51b5\u4e0b\u7684\u51fa\u9519\u5904\u7406.<\/p>\n

free_process_to_scan(pts);  \/\/ \u91ca\u653e\u6389\u4e4b\u524d\u5206\u914d\u7684process_to_scan\u7ed3\u6784\u4f53<\/p>\n

goto _err;      \/\/ \u8df3\u5230\u51fa\u9519\u5904\u7406.<\/p>\n

}<\/p>\n

strcpy(pts->comm, comm); \/\/ \u62f7\u8d1d\u7a0b\u5e8f\u540d<\/p>\n

list_add(&pts->list, &processes_to_scan_head); \/\/ \u52a0\u5165\u5faa\u73af\u53cc\u94fe\u8868<\/p>\n

}<\/p>\n

spin_unlock(&processes_to_scan_lock);  \/\/ \u91ca\u653e\u540c\u6b65\u7528\u81ea\u65cb\u9501<\/p>\n

KSM+\u7684\u5185\u6838\u7ebf\u7a0b\u5468\u671f\u6027\u5730\u68c0\u67e5\u7cfb\u7edf\u7684\u7cfb\u7edf\u7684\u8fdb\u7a0b\u94fe\u8868\uff0c\u53d1\u73b0\u9700\u8981\u626b\u63cf\u7684\u7a0b\u5e8f\u521b\u5efa\u4e86\u65b0\u7684\u8fdb\u7a0b\u65f6\uff0c\u5c31\u521b\u5efa\u4e00\u4e2amm_slot\u7ed3\u6784\u5206\u914d\u7ed9\u8be5\u8fdb\u7a0b\u3002\u59823.4.1\u5c0f\u8282\u6240\u8ff0\uff0cKSM \u628a\u6240\u6709\u7684mm_slot\u94fe\u63a5\u5728\u4e00\u8d77\uff0c\u6bcf\u4e2amm_slot\u5bf9\u5e94\u4e00\u4e2a\u8fdb\u7a0b\u7684\u5185\u5b58\u63cf\u8ff0\u7b26\uff0cKSM\u5c06\u901a\u8fc7\u8fd9\u4e9b\u4fe1\u606f\u8fdb\u884c\u626b\u63cf\u64cd\u4f5c\u3002KSM+\u57fa\u672c\u6cbf\u7528KSM\u4e2d\u7684mm_slot\u7ed3\u6784\u4f53\u3002\u5bf9\u5e94\u7684\u4ee3\u7801\u7247\u65ad\u662f\uff1a<\/p>\n

read_lock(&tasklist_lock);  \/\/ \u4ee5\u8bfb\u7684\u65b9\u5f0f\u5f97\u5230\u7cfb\u7edf\u4e2d\u8fdb\u7a0b\u94fe\u8868\u7684\u8bfb\u5199\u9501<\/p>\n

for_each_process(p) {     \/\/ \u904d\u5386\u6bcf\u4e00\u4e2a\u8fdb\u7a0b<\/p>\n

get_task_comm(comm, p);  \/\/ \u5f97\u5230\u8fdb\u7a0b\u7684\u7a0b\u5e8f\u540d<\/p>\n

matched = 0;<\/p>\n

spin_lock(&processes_to_scan_lock);\/\/\u5f97\u5230\u9700\u626b\u63cf\u7a0b\u5e8f\u540d\u79f0\u7684\u94fe\u8868\u7684\u81ea\u65cb\u9501<\/p>\n

matched = process2scan_exist(comm); \/\/ \u662f\u5426\u662f\u9700\u8981\u88ab\u626b\u63cf\u7684\u7a0b\u5e8f<\/p>\n

spin_unlock(&processes_to_scan_lock); \/\/ \u91ca\u653e\u81ea\u65cb\u9501<\/p>\n

if (matched)  \/\/ \u5982\u679c\u662f\u9700\u8981\u88ab\u626b\u63cf\u7684\u7a0b\u5e8f<\/p>\n

{<\/p>\n

task_ksm_enter(p);  \/\/ \u8be5\u51fd\u6570\u4ee5task_t\u4e3a\u53c2\u6570\u505a\u8fdb\u4e00\u6b65\u5904\u7406<\/p>\n

}<\/p>\n

}<\/p>\n

read_unlock(&tasklist_lock); \/\/ \u91ca\u653e\u4fdd\u62a4\u7cfb\u7edf\u4e2d\u8fdb\u7a0b\u94fe\u8868\u7684\u8bfb\u5199\u9501\u3002<\/p>\n

4.2.2 \u626b\u63cf\u7b97\u6cd5\u7684\u6838\u5fc3\u4ee3\u7801<\/h3>\n

KSM+\u4e0eKSM\u5728\u6570\u636e\u7ed3\u6784\u65b9\u9762\u7684\u4e3b\u8981\u533a\u522b\u662fKSM+\u5f15\u5165\u4e86vma_node\u7ed3\u6784\u4f53\u3002KSM\u4f7f\u7528mm_slot\uff0crmap_item\u4e24\u7ea7\u6570\u636e\u7ed3\u6784\uff0cKSM+\u4f7f\u7528mm_slot\uff0cvma_node\uff0crmap_item\u4e09\u7ea7\u6570\u636e\u7ed3\u6784\u3002rmap_item\u6302\u5728vma_node\u4e0a\u3002\u7ed3\u6784\u4f53vma_node\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n

struct vma_node {<\/p>\n

struct rb_node; \/\/ \u7ea2\u9ed1\u6811\u7ed3\u70b9\uff0c\u7528\u4e8e\u628avma_node\u94fe\u63a5\u5230mm_slot\u7684\u7ea2\u9ed1\u6811\u4e0a<\/p>\n

     struct vm_area_struct *vma; \/\/ \u5bf9\u5e94\u7684\u865a\u62df\u5185\u5b58\u533a\u57df<\/p>\n

     unsigned long start;  \/\/ \u865a\u62df\u5730\u5740\u7684\u8d77\u70b9<\/p>\n

     unsigned long end;   \/\/ \u865a\u62df\u5730\u5740\u7684\u7ec8\u70b9<\/p>\n

     struct rmap_item *rmap_list;  \/\/ \u6302\u63a5\u5230\u8be5\u865a\u62df\u5185\u5b58\u533a\u57df\u7684rmap_item\u94fe\u8868<\/p>\n

     struct rmap_item *rmap_current;  \/\/ \u5f53\u524d\u626b\u63cf\u4f7f\u7528\u7684rmap_item<\/p>\n

u8 coefficient;  \/\/ \u8be5\u865a\u62df\u5185\u5b58\u533a\u57df\u4f7f\u7528\u7684\u91c7\u6837\u7cfb\u6570<\/p>\n

};<\/p>\n

\u66f4\u6539\u6570\u636e\u7ed3\u6784\u540eKSM+\u7684\u626b\u63cf\u7b97\u6cd5\u6982\u62ec\u4e3a\uff1a\u904d\u5386\u6bcf\u4e2amm_slot\uff1b\u5bf9\u4e8emm_slot\uff0c\u904d\u5386\u6bcf\u4e2avma_node\uff1b\u5bf9\u4e8e\u6bcf\u4e2avma_node\uff0c\u8c03\u7528\u91c7\u6837\u51fd\u6570vma_node_do_sampling()\u751f\u6210\u6302\u63a5\u5728vma_node\u4e0a\u7684rmap_item\uff1b\u5bf9\u4e8e\u6bcf\u4e2armap_item\uff0c\u8c03\u7528\u5bfb\u627e\u76f8\u540c\u9875\u9762\u7684\u903b\u8f91\u3002<\/p>\n

\u5176\u4e2d\u6700\u4e3a\u6838\u5fc3\u7684\u662f\u91c7\u6837\u51fd\u6570vma_node_do_sampling()\uff0c\u5b83\u5b8c\u6210\u4e09\u4e2a\u4e3b\u8981\u804c\u80fd\uff1a\u91c7\u6837\u9875\u9762\uff1b\u56de\u6536\u6ca1\u6709\u5408\u5e76\u6210\u529f\u7684rmap_item\uff1b\u56de\u6536vma_node\u3002<\/p>\n

\u7b80\u5316\u540e\u91c7\u6837\u9875\u9762\u7684\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n

pages_count = (vma_node->end – vma_node->start) >> 12; \/\/ \u8ba1\u7b97\u6709\u591a\u5c11\u4e2a\u9875\u9762<\/p>\n

sample_count = pages_count * vma_node->coefficient \/ 100;\/\/ \u8ba1\u7b97\u8981\u91c7\u6837\u591a\u5c11\u4e2a\u9875\u9762<\/p>\n

gap_len = pages_count \/ sample_count ; \/\/ \u5e73\u5747\u591a\u5c11\u4e2a\u9875\u9762\u4e2d\u91c7\u6837\u4e00\u4e2a\u9875\u9762<\/p>\n

left = right = 0;        \/\/ \u9884\u7f6e\u5de6\u533a\u95f4\u548c\u53f3\u533a\u95f4\u90fd\u662f0<\/p>\n

while (1)<\/p>\n

{<\/p>\n

left = right;   \/\/ \u672c\u6b21\u7684\u5de6\u533a\u95f4\u662f\u4e0a\u6b21\u7684\u53f3\u533a\u95f4<\/p>\n

right = left + gap_len;  \/\/ \u672c\u6b21\u7684\u53f3\u533a\u95f4<\/p>\n

if ( right > pages_count ) {  \/\/ \u53f3\u533a\u95f4\u5927\u4e8e\u9875\u9762\u603b\u6570.<\/p>\n

break;  \/\/ \u91c7\u6837\u7ed3\u675f<\/p>\n

}<\/p>\n

index = left + random32() % gap_len;  \/\/ \u5728\u533a\u95f4\u5185\u968f\u673a\u62bd\u53d6\u4e00\u4e2a\u9875\u9762<\/p>\n

address = vma_node->start + (index << 12); \/\/ \u8ba1\u7b97\u8be5\u9875\u9762\u7684\u865a\u62df\u5730\u5740<\/p>\n

 }<\/p>\n

vma_node->coefficient -= 10; \/\/ \u672c\u8f6e\u91c7\u6837\u540e\u51cf\u5c11\u91c7\u6837\u7cfb\u6570\u7684\u53d6\u503c<\/p>\n

\u7b80\u5316\u540e\u56de\u6536rmap_item\u7684\u5b9e\u73b0\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n

 \/\/ \u53cc\u6307\u9488\u6307\u5411\u6307\u5411\u94fe\u8868\u4e2d\u7b2c\u4e00\u4e2armap_item\u7684\u6307\u9488<\/p>\n

struct rmap_item **item = &vma_node->rmap_list; <\/p>\n

\/\/ \u904d\u5386\u94fe\u8868\uff0c\u4e00\u76f4\u5230\u5f53\u524d\u6307\u5411\u7684rmap_item\u7684\u5730\u5740\u6bd4\u5f53\u524d\u91c7\u6837\u7684\u5730\u5740\u5927.<\/p>\n

while (*item && ((*item)->address & PAGE_MASK) < address)<\/p>\n

{<\/p>\n

addr = (*item)->address;<\/p>\n

if(!(addr & STABLE_FLAG)) \/\/ \u5982\u679crmap_item\u4e0d\u5728\u7a33\u5b9a\u6811\u4e0a<\/p>\n

{<\/p>\n

struct rmap_item *ri = *item; <\/p>\n

*item = ri->rmap_list;\/\/\u53cc\u6307\u9488\u6307\u5411\u6307\u5411\u4e0b\u4e00\u4e2armap_item\u7684\u6307\u9488<\/p>\n

free_rmap_item(ri); \/\/ \u9500\u6bc1\u8be5rmap_item<\/p>\n

continue;<\/p>\n

}<\/p>\n

item = &(*item)->rmap_list; \/\/ \u53cc\u6307\u9488\u6307\u5411\u6307\u5411\u4e0b\u4e00\u4e2armap_item\u7684\u6307\u9488<\/p>\n

}<\/p>\n

if (*item) { \/\/ rmap_item\u5728\u7a33\u5b9a\u6811\u6216\u4e0d\u7a33\u5b9a\u6811\u4e0a\uff0c\u53c8\u88ab\u672c\u6b21\u91c7\u6837\u547d\u4e2d<\/p>\n

addr = ((*item)->address & PAGE_MASK);<\/p>\n

if (addr == address) {<\/p>\n

item = &(*item)->rmap_list;<\/p>\n

continue;<\/p>\n

}<\/p>\n

}<\/p>\n

new = alloc_rmap_item();   \/\/ \u5206\u914d\u65b0\u7684rmap_item<\/p>\n

……  \/\/ \u586b\u5145\u65b0rmap_item\u7684\u5b57\u6bb5<\/p>\n

*item = new;  \/\/ \u628a\u65b0 rmap_item\u6302\u63a5\u5230\u94fe\u8868\u4e0a<\/p>\n

item = &new->rmap_list; <\/p>\n

\u5230\u672c\u8f6e\u91c7\u6837\u7684sample_count\u4e2a\u9875\u9762\u5168\u90e8\u5904\u7406\u5b8c\u540e\uff0c\u5982\u679c\u53cc\u6307\u9488item\u4e0d\u4e3aNULL\uff0c\u5373\u6307\u5411rmap_item \u94fe\u8868\u5c3e\u90e8\u7684\u5269\u4f59\u7684\u7ed3\u70b9\uff0c\u5bf9\u8fd9\u4e9b\u7ed3\u70b9\u6267\u884c\u4e0a\u6587\u4e00\u6837\u7684\u9500\u6bc1rmap_item\u7684\u7b97\u6cd5\u3002<\/p>\n

\u56de\u6536vma_node\u7684\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n

\/\/ \u672c\u8f6e\u8fc7\u540e\u6ca1\u6709\u4efb\u4f55rmap_item\u5728\u7a33\u5b9a\u6811\u4e0a\u4e14\u91c7\u6837\u7cfb\u6570\u5c0f\u4e8e10<\/p>\n

if (0 == stable_node_count && vma_node->coefficient < 10)<\/p>\n

{<\/p>\n

struct rmap_item *item;<\/p>\n

while (vma_node->rmap_list) \/\/ \u9500\u6bc1vma_node\u4e0a\u7ef4\u62a4\u7684\u6240\u6709rmap_item<\/p>\n

{<\/p>\n

item = vma_node->rmap_list;<\/p>\n

vma_node->rmap_list = item->rmap_list;<\/p>\n

remove_rmap_item_from_tree(item);<\/p>\n

free_rmap_item(item);<\/p>\n

}<\/p>\n

vma_node->vma->vm_flags |= VM_NOT_MERGEABLE; \/\/ \u7f6e\u6807\u5fd7\u4f4d<\/p>\n

}<\/p>\n

4.3 \u672c\u7ae0\u5c0f\u7ed3<\/h2>\n

      \u672c\u7ae0\u8be6\u7ec6\u4ecb\u7ecd\u4e86KSM+\u5728KSM\u7684\u57fa\u7840\u4e0a\u505a\u7684\u6539\u8fdb\u3002KSM+\u4e3b\u8981\u9488\u5bf9\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u7684\u5e94\u7528\u573a\u666f\u6539\u8fdb\u4e86\u5185\u6838\u6a21\u5757\u548c\u7528\u6237\u7a7a\u95f4\u7684\u4ea4\u4e92\u65b9\u5f0f\uff0c\u4f7f\u5f97\u7528\u6237\u53ef\u4ee5\u65b9\u4fbf\u7684\u6307\u5b9a\u7a0b\u5e8f\u8fdb\u884c\u5185\u5b58\u53bb\u91cd\u64cd\u4f5c\uff1b\u4ee5\u53ca\u6a21\u5757\u4e2d\u6570\u636e\u7ed3\u6784\u7684\u4f18\u5316\uff0c\u4f7fKSM+\u8f83\u4e4bKSM\u81ea\u8eab\u66f4\u8282\u7701\u5185\u5b58\u3002\u6700\u540e\uff0c\u672c\u7ae0\u5206\u6790\u4e86KSM+\u7684\u5b9e\u73b0\u90e8\u5206\u7684\u6838\u5fc3\u4ee3\u7801\u3002<\/p>\n

    <\/p>\n

\u7b2c\u4e94\u7ae0 \u5b9e\u9a8c\u7ed3\u679c\u53ca\u5206\u6790<\/h1>\n

5.1 KSM+\u7684\u5b9e\u9a8c\u7ed3\u679c<\/h2>\n

      \u672c\u5c0f\u8282\u7528\u4e24\u7c7b\u7a0b\u5e8f\u4f5c\u4e3a\u5b9e\u9a8c\u5bf9\u8c61\u5206\u6790KSM+\u7684\u5b9e\u9645\u6267\u884c\u6548\u679c\u3002\u7b2c\u4e00\u7c7b\u7a0b\u5e8f\u6709\u5927\u91cf\u7684\u91cd\u590d\u5185\u5b58\u53ef\u4ee5\u5408\u5e76\uff0c\u7b2c\u4e8c\u7c7b\u7a0b\u5e8f\u5219\u662fLinux\u684c\u9762\u73af\u5883\u4e0a\u7684\u5e38\u7528\u7a0b\u5e8f\u3002<\/p>\n

5.1.1 \u9488\u5bf9\u6709\u5927\u91cf\u91cd\u590d\u9875\u9762\u7684\u7a0b\u5e8f<\/h3>\n

\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5e94\u7528\u7a0b\u5e8f\u672c\u8eab\u6216\u5e94\u7528\u7a0b\u5e8f\u4e4b\u95f4\u5e76\u6ca1\u6709\u592a\u591a\u91cd\u590d\u9875\u9762\u3002\u4f46\u8fd9\u6837\u7684\u4f8b\u5b50\u5e76\u975e\u4e0d\u5b58\u5728\u3002\u5982KSM\u6a21\u5757\u7684\u51fa\u73b0\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd0\u884c\u76f8\u540c\u64cd\u4f5c\u7cfb\u7edf\u7684\u865a\u62df\u673a\u7a0b\u5e8f\u4e4b\u95f4\u7684\u5b58\u5728\u5927\u91cf\u91cd\u590d\u5185\u5bb9\u9875\u9762\u7684\u95ee\u9898\uff0c\u518d\u59821.2\u5c0f\u8282\u4e2d\u63d0\u5230\u7684\u6b27\u6d32\u6838\u5b50\u7814\u7a76\u4e2d\u5fc3\u5e76\u884c\u6267\u884c\u591a\u4e2a\u7a0b\u5e8f\uff0c\u8f7d\u5165\u5927\u91cf\u76f8\u540c\u7684\u6570\u636e\u4f7f\u5f97\u5185\u5b58\u91cc\u6709\u5927\u91cf\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\u3002<\/p>\n

\u4e3a\u4e86\u5b9e\u9a8c\u65b9\u4fbf\uff0c\u53ef\u4ee5\u7f16\u5199\u4e00\u4e2a\u6a21\u62df\u7a0b\u5e8f\uff0c\u4f46\u4ecd\u80fd\u8fbe\u5230\u9a8c\u8bc1\u672c\u5de5\u7a0b\u7684\u76ee\u7684\u3002\u9a8c\u8bc1\u6240\u7528\u7684\u6a21\u62df\u7a0b\u5e8ftest.c\u5982\u4e0b\uff1a<\/p>\n

int main()<\/p>\n

{<\/p>\n

char *mem;<\/p>\n

int i, size;<\/p>\n

size = 0x1400000; <\/p>\n

mem = (char*)malloc(size);<\/p>\n

for (i = 0; i < size; i++)<\/p>\n

mem[i] = (i%256);<\/p>\n

getchar();<\/p>\n

free(mem);<\/p>\n

return 0;<\/p>\n

}<\/p>\n

\u8be5\u7a0b\u5e8f\u7528\u6765\u6d4b\u8bd5\u4e00\u4e2a\u6781\u7aef\u7684\u60c5\u51b5\uff0c\u5b83\u7533\u8bf7\u4e8620 * 220\u5b57\u8282\uff0c\u537320M\u5185\u5b58\u7a7a\u95f4\uff0c\u5e76\u628a20M\u5185\u5b58\u7a7a\u95f4\u6309\u5b57\u8282\u4f9d\u6b21\u5faa\u73af\u8bbe\u7f6e\u4e3a0\u5230255\u4e4b\u95f4\u7684\u6570\u3002\u8fd9\u6837\uff0c\u5982\u679c\u5206\u914d\u768420M\u5185\u5b58\u7684\u8d77\u59cb\u5730\u5740\u63094K\u5bf9\u9f50\uff0c\u90a3\u4e4820M\u5185\u5b58\u5171\u670920 * 220 \/ 212\u4e2a\u9875\u9762\uff0c\u53735120\u4e2a\u9875\u9762\uff0c\u4e14\u6bcf\u4e2a\u9875\u9762\u7684\u5185\u5bb9\u4e00\u6837\u3002\u7f16\u8bd1\u8fd9\u4e2a\u7a0b\u5e8f\uff1a$ gcc test.c –o test\u3002\u5e76\u8fd0\u884c\u8be5\u7a0b\u5e8f\u7684\u4e24\u4e2a\u8fdb\u7a0b\u5b9e\u4f8b\u3002\u5982\u56fe5-1\u6240\u793a\uff0c\u8fd9\u4e24\u4e2a\u8fdb\u7a0b\u7684PID\u5206\u522b\u4e3a2207\u548c2206\uff0c\u5b83\u4eec\u90fd\u4f7f\u7528\u4e8620.1MB\u5185\u5b58\uff0c\u4e14\u6b64\u65f6\u6574\u4e2a\u7cfb\u7edf\u4f7f\u7528\u5185\u5b58174MB\u3002<\/p>\n

 <\/p>\n

<\/p>\n

<\/p>\n

\u56fe5-1 \u5408\u5e76\u9875\u9762\u524d\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u548ctest\u7a0b\u5e8f\u6d88\u8017\u7684\u5185\u5b58<\/p>\n

 <\/p>\n

\u4e0b\u9762\u8ba9KSM+\u5408\u5e76\u5185\u5b58\uff0c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n

#echo “+ test” > \/sys\/kernel\/mm\/ksm+\/processes_to_scan<\/p>\n

#echo 1 > \/sys\/kernel\/mm\/ksm+\/run<\/p>\n

\u7b2c\u4e00\u6761\u547d\u4ee4\u4f7f\u7528\u4e86\u6539\u8fdb\u540e\u7684\u4ea4\u4e92\u65b9\u5f0f\uff0c\u5b83\u901a\u77e5KSM\u5408\u5e76\u7a0b\u5e8f\u540d\u4e3atest\u7684\u91cd\u590d\u5185\u5b58\u3002\u7b2c\u4e8c\u6761\u547d\u4ee4\u8ba9KSM\u8fdb\u5165\u5408\u5e76\u6a21\u5f0f\uff0c\u5982\u679c\u7ed9\/sys\/kernel\/mm\/ksm+\/run\u5199\u51650\u503c\uff0c\u5219KSM+\u505c\u6b62\u5de5\u4f5c\u3002\u76ee\u524d\u672c\u5de5\u7a0b\u7684\u5b9e\u73b0\u4e2d\uff0cKSM+\u9ed8\u8ba4\u5728\u505c\u6b62\u72b6\u6001\u3002<\/p>\n

KSM+\u5b8c\u6210\u6240\u6709\u5408\u5e76\u7684\u65f6\u95f4\u957f\u77ed\u53d6\u51b3\u4e8e\u5bf9KSM+\u8bbe\u7f6e\u7684\u63cf\u8ff0\u8f6e\u6570\u4e4b\u95f4\u7684\u95f4\u9694\u65f6\u95f4\u548c\u6bcf\u8f6e\u626b\u63cf\u7684\u9875\u9762\u591a\u5c11\uff0c\u91c7\u7528\u8d8a\u5c0f\u7684\u65f6\u95f4\u95f4\u9694\uff0c\u8d8a\u591a\u7684\u6bcf\u8f6e\u63cf\u8ff0\u9875\u9762\u6570\u91cf\uff0c\u4f1a\u5bf9\u7cfb\u7edf\u7684\u6574\u4f53\u54cd\u5e94\u65f6\u95f4\u9020\u6210\u8d8a\u5927\u7684\u8d1f\u9762\u5f71\u54cd\u3002\u66f4\u6539\u540e\u7684\u9ed8\u8ba4\u8bbe\u7f6e\u4e3a\u6bcf600MS\u63cf\u8ff0\u4e00\u8f6e\uff0c\u6bcf\u8f6e\u63cf\u8ff0 100\u4e2a\u9875\u9762\u3002\u56e0\u6b64\uff0c\u5728\u6700\u597d\u7684\u60c5\u51b5\u4e0b\uff0c\u6bcf\u4e2a\u63cf\u8ff0\u9875\u9762\u90fd\u80fd\u88ab\u5408\u5e76\uff0c\u90a3\u4e48\u9ed8\u8ba4\u7684\u5408\u5e76\u901f\u5ea6\u662f667K\/S\u3002\u7531\u6b64\u5f97\u51fa\uff0c\u5728\u9ed8\u8ba4\u8bbe\u7f6e\u4e0b\uff0c\u9700\u898140*1024\/667\u79d2\uff0c\u5927\u6982\u4e00\u5206\u949f\u7684\u65f6\u5019\u5408\u5e76\u5b8c40M\u5185\u5b58\u7a7a\u95f4\u3002\u672c\u6b21\u5b9e\u9a8c\u4e2d\u7ecf\u8fc7\u5927\u7ea665\u79d2\u540e\uff0c\u91cd\u590d\u9875\u9762\u88ab\u5408\u5e76\u5b8c\u6bd5\u3002\u5982\u56fe5-2\u6240\u793a\uff0c\u4e24\u4e2atest\u8fdb\u7a0b\u5728\u91cd\u590d\u9875\u9762\u88ab\u5408\u5e76\u540e\u90fd\u51cf\u5c11\u4e86\u8fd120M\u5185\u5b58\u5360\u7528\u91cf\uff0c\u5373\u5171\u8282\u7701\u4e8640MB\u5185\u5b58\u3002\u5176\u4e2dPID\u4e3a2207\u7684\u8fdb\u7a0b\u6bd4PID\u4e3a2206\u7684\u8fdb\u7a0b\u591a\u5360\u7528\u4e864K\uff0c\u5373\u4e00\u4e2a\u9875\u9762\u7684\u5185\u5b58\u91cf\u3002\u8fd9\u662f\u56e0\u4e3a\u8fd140M\u5927\u5c0f\u7684\u76f8\u540c\u9875\u9762\u88ab\u5408\u5e76\u5230\u4e00\u4e2a\u9875\u9762\uff0c\u800c\u8fd9\u4e2a\u9875\u9762\u5728PID\u4e3a2207\u7684\u8fdb\u7a0b\u4e2d\u3002\u53e6\u5916\uff0c\u4ece\u7cfb\u7edf\u5168\u5c40\u6765\u770b\uff0c\u7cfb\u7edf\u5360\u7528\u7684\u5185\u5b58\u4ece174.0MB\u51cf\u5c11\u5230134.1MB\uff0c\u5171\u51cf\u5c1139.9MB\uff0c\u975e\u5e38\u63a5\u8fd1\u51cf\u5c1140MB\u7684\u9884\u671f\u3002\u8fd90.1MB\u7684\u7ec6\u5fae\u5dee\u8ddd\u53d7\u5230\u7cfb\u7edf\u4e2d\u5176\u5b83\u8fdb\u7a0b\u7533\u8bf7\u548c\u91ca\u653e\u5185\u5b58\u7684\u5f71\u54cd\u3002<\/p>\n

 <\/p>\n

<\/p>\n

<\/p>\n

\u56fe5-2\u5408\u5e76\u9875\u9762\u540e\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u548ctest\u7a0b\u5e8f\u6d88\u8017\u7684\u5185\u5b58<\/p>\n

 <\/p>\n

\u6b64\u65f6\uff0c\u5982\u679c\u9700\u8981\u64a4\u6d88\u6240\u6709\u5408\u5e76\u7684\u9875\u9762\uff0c\u53ef\u7528\u547d\u4ee4# echo 2 > \/sys\/kernel\/mm\/ksm+\/run\u3002<\/p>\n

\u64a4\u6d88\u5408\u5e76\u9875\u9762\u540e\uff0c\u4e24\u4e2atest\u8fdb\u7a0b\u6d88\u8017\u7684\u5185\u5b58\u53c8\u56de\u5230\u540420MB\u3002<\/p>\n

      \u672c\u5c0f\u8282\u7684\u5b9e\u9a8c\u8bc1\u660eKSM+\u53ef\u4ee5\u8ba9\u7528\u6237\u65b9\u4fbf\u5730\u6307\u5b9a\u5408\u5e76\u67d0\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\uff0c\u5bf9\u4e8e\u6709\u5927\u91cf\u91cd\u590d\u9875\u9762\u7684\u7a0b\u5e8f\uff0c\u6539\u8fdb\u540e\u7684KSM+\u80fd\u663e\u8457\u5730\u51cf\u5c11\u5b83\u4eec\u7684\u5185\u5b58\u4f7f\u7528\u91cf\u3002<\/p>\n

5.1.2 \u9488\u5bf9Linux\u684c\u9762\u7684\u5e38\u7528\u7a0b\u5e8f<\/h3>\n

\u4e0a\u4e00\u5c0f\u8282\u662f\u5bf9\u5047\u60f3\u7a0b\u5e8f\u7684\u5b9e\u9a8c\u6548\u679c\uff0c\u800c\u672c\u8282\u5c06\u5728\u5b9e\u9645\u7684Linux\u684c\u9762\u5e94\u7528\u73af\u5883\u4e2d\u68c0\u9a8cKSM+\u3002
\n\t\t      \u5b9e\u9a8c\u4e00\u3002Okular\u662fLinux\u5e73\u53f0\u4e0b\u4e00\u4e2a\u5e38\u7528\u7684pdf\u9605\u8bfb\u8f6f\u4ef6\u3002\u672c\u6b21\u5b9e\u9a8c\u540c\u65f6\u8fd0\u884cokular\u7a0b\u5e8f\u7684\u56db\u4e2a\u8fdb\u7a0b\u5b9e\u4f8b\uff0c\u6bcf\u4e2a\u8fdb\u7a0b\u6253\u5f00\u4e0d\u540c\u7684pdf\u6587\u4ef6\u3002\u56db\u4e2aokular\u8fdb\u7a0b\u6240\u6d88\u8017\u7684\u5185\u5b58\u8d44\u6e90\u4ee5\u53ca\u7cfb\u7edf\u6d88\u8017\u7684\u603b\u5185\u5b58\u8d44\u6e90\u5982\u56fe5-3\u6240\u793a\u3002\u5728\u9ed8\u8ba4\u8bbe\u7f6e\u4e0b\uff0c\u7ecf\u8fc7\u5927\u7ea6\u4e24\u5206\u949f\uff0cKSM+\u57fa\u672c\u5b8c\u6210\u4e86\u5408\u5e76\u91cd\u590d\u9875\u9762\u3002\u6b64\u65f6\uff0c\u56db\u4e2aokular\u8fdb\u7a0b\u4ee5\u53ca\u6574\u4e2a\u7cfb\u7edf\u6240\u6d88\u8017\u7684\u5185\u5b58\u8d44\u6e90\u5982\u56fe5-4\u6240\u793a\u3002\u7ecf\u8ba1\u7b97\uff0c\u4e0e\u5408\u5e76\u524d\u76f8\u6bd4\uff0c\u56db\u4e2a\u8fdb\u7a0b\u5171\u8282\u7701\u5185\u5b5814.4MB\u3002\u6bd4\u8f83\u6574\u4e2a\u7cfb\u7edf\u5728\u5408\u5e76\u524d\u540e\u7684\u5185\u5b58\u4f7f\u7528\uff0c\u4e5f\u51cf\u5c11\u4e8613M\u5185\u5b58\u3002\u56e0\u4e3a\u6bd4\u8f83\u6574\u4e2a\u7cfb\u7edf\u7684\u5185\u5b58\u51cf\u5c11\u91cf\u65f6\u628aKSM+\u672c\u8eab\u7684\u5185\u5b58\u6d88\u8017\u8ba1\u7b97\u5728\u5185\uff0c\u6240\u4ee5\u6570\u503c\u4f1a\u6bd4\u5355\u72ec\u8003\u5bdf\u88ab\u5408\u5e76\u8fdb\u7a0b\u7684\u5185\u5b58\u51cf\u5c11\u91cf\u8981\u5c11\u4e00\u4e9b\uff0c\u4f46\u6bd4\u8f83\u6574\u4e2a\u7cfb\u7edf\u7684\u5185\u5b58\u53d8\u5316\u66f4\u5408\u7406\u3002\u53e6\u5916\uff0c\u67e5\u770b \/sys\/kernel\/mm\/ksm+\/pages_sharing\u6587\u4ef6\u53ef\u4ee5\u5f97\u5230\u5171\u8282\u7701\u4e86\u591a\u5c11\u4e2a\u9875\u9762\u3002\u53ef\u4f7f\u7528\u547d\u4ee4\uff1a # cat \/sys\/kernel\/mm\/ksm+\/pages_sharing\uff0c\u6b64\u65f6\u5f97\u5230\u8f93\u51fa3668\u3002\u56e0\u4e3a\u6bcf\u4e2a\u9875\u9762\u53604K\u5927\u5c0f\uff0c\u5373\u5171\u8282\u7701\u5185\u5b5814672K\uff0c\u975e\u5e38\u63a5\u8fd1\u4e4b\u524d\u8ba1\u7b97\u5f97\u5230\u768414.4MB\u3002\u5982\u679c\u5408\u5e76\u6548\u7387\u5b9a\u4e49\u4e3a\u8282\u7701\u7684\u5185\u5b58\u9664\u4ee5\u5408\u5e76\u524d\u7684\u5185\u5b58\u4e4b\u548c\u3002\u90a3\u4e48\u6b64\u6b21\u5185\u5b58\u5408\u5e76\u6548\u7387\u4e3a\uff1a14.4\/(22.8+21.4+19.9+15.3) = 18.14%\u3002 <\/p>\n

  <\/p>\n

<\/p>\n

\u56fe5-3\u5408\u5e76\u9875\u9762\u524d\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u548cokular\u7a0b\u5e8f\u6d88\u8017\u7684\u5185\u5b58<\/p>\n

 <\/p>\n

<\/p>\n

<\/p>\n

\u56fe5-4\u5408\u5e76\u9875\u9762\u540e\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u548cokular\u7a0b\u5e8f\u6d88\u8017\u7684\u5185\u5b58<\/p>\n

 <\/p>\n

\u5b9e\u9a8c\u4e8c\u3002Gimp\u662fLinux\u5e73\u53f0\u4e0b\u6700\u5e38\u7528\u7684\u56fe\u50cf\u7f16\u8f91\u8f6f\u4ef6\uff0c\u76f8\u5f53\u4e8eWindows\u5e73\u53f0\u4e0b\u7684Photoshop\u3002\u672c\u6b21\u5b9e\u9a8c\u7528gimp\u6253\u5f005\u5f20\u56fe\u7247\u3002\u5408\u5e76\u9875\u9762\u524d\u540e\uff0c\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u548cgimp\u5355\u72ec\u6d88\u8017\u7684\u5185\u5b58\u5206\u522b\u5982\u56fe5-5\u548c\u56fe5-6\u6240\u793a\u3002\u8ba1\u7b97\u5f97\u5230\u5408\u5e76\u9875\u9762\u524d\u540e\uff0c\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u51cf\u5c1113.7M\uff0c\u800cgimp\u8fdb\u7a0b\u6d88\u8017\u7684\u5185\u5b58\u51cf\u5c1114.7M\uff0c\u8fd9\u4e24\u4e2a\u6570\u503c\u975e\u5e38\u63a5\u8fd1\u3002\u5185\u5b58\u5408\u5e76\u6548\u7387\u4e3a14.7\/91.2 = 16.12%\u3002\u672c\u6b21\u5b9e\u9a8c\u8bf4\u660egimp\u7a0b\u5e8f\u4e5f\u6709\u53ef\u89c2\u7684\u91cd\u590d\u5185\u5b58\u7528\u6765\u5408\u5e76\u3002<\/p>\n

 <\/p>\n

<\/p>\n

<\/p>\n

\u56fe5-5\u5408\u5e76\u9875\u9762\u524d\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u548cgimp\u7a0b\u5e8f\u6d88\u8017\u7684\u5185\u5b58<\/p>\n

 <\/p>\n

<\/p>\n

<\/p>\n

\u56fe5-6\u5408\u5e76\u9875\u9762\u540e\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u548cgimp\u7a0b\u5e8f\u6d88\u8017\u7684\u5185\u5b58<\/p>\n

 <\/p>\n

\u5b9e\u9a8c\u4e09\u3002Epiphany\u662fLinux\u4e0bGNOME\u684c\u9762\u7684\u9ed8\u8ba4\u6d4f\u89c8\u5668\u3002\u4e3a\u4e86\u9632\u6b62\u6d4f\u89c8\u5668\u548cWEB\u670d\u52a1\u5668\u6301\u7eed\u4ea4\u4e92\u5f71\u54cd\u6d4b\u8bd5\u6548\u679c\uff0c\u672c\u6b21\u5b9e\u9a8c\u7528\u8be5\u6d4f\u89c8\u5668\u6253\u5f00\u56db\u4e2a\u5df2\u7ecf\u4e0b\u8f7d\u597d\u7684\u7f51\u9875\u5e76\u5de5\u4f5c\u5728\u8131\u673a\u72b6\u6001\u3002\u8fd9\u56db\u4e2a\u9875\u9762\u5206\u522b\u662f\uff1a\u817e\u8baf\u95e8\u6237\u7684\u9996\u9875\uff0c\u641c\u72d0\u95e8\u6237\u7684\u9996\u9875\uff0c\u4ee5\u53ca\u4e24\u4e2a\u65b0\u95fb\u9875\u9762\u3002<\/p>\n

\u5408\u5e76\u9875\u9762\u524d\u540e\uff0c\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u548c\u6d4f\u89c8\u5668\u5355\u72ec\u6d88\u8017\u7684\u5185\u5b58\u5206\u522b\u5982\u56fe5.7\u548c\u56fe5.8\u6240\u793a\u3002\u8ba1\u7b97\u5f97\u5230\u5408\u5e76\u9875\u9762\u524d\u540e\uff0c\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u51cf\u5c111.1M\uff0c\u800c\u6d4f\u89c8\u5668\u6d88\u8017\u7684\u5185\u5b58\u51cf\u5c113.6M\u3002\u5185\u5b58\u5408\u5e76\u6548\u7387\u4ec5\u4e3a3.6\/90.5 = 3.97%\u3002\u672c\u6b21\u5b9e\u9a8c\u8bf4\u660eepiphany\u6d4f\u89c8\u7f51\u9875\u65f6\u6ca1\u6709\u5f88\u591a\u7684\u53ef\u5408\u5e76\u9875\u9762\u3002<\/p>\n

 <\/p>\n

<\/p>\n

<\/p>\n

\u56fe5-7\u5408\u5e76\u9875\u9762\u524d\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u548c\u6d4f\u89c8\u5668\u7a0b\u5e8f\u6d88\u8017\u7684\u5185\u5b58<\/p>\n

 <\/p>\n

<\/p>\n

<\/p>\n

\u56fe5-8\u5408\u5e76\u9875\u9762\u540e\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u548c\u6d4f\u89c8\u5668\u7a0b\u5e8f\u6d88\u8017\u7684\u5185\u5b58<\/p>\n

 <\/p>\n

\u5b9e\u9a8c\u56db\u3002\u672c\u5b9e\u9a8c\u6a21\u62df\u5e38\u89c1\u7684Linux\u684c\u9762\u7528\u6237\u4f7f\u7528\u73af\u5883\uff0c\u6d4b\u8bd5\u589e\u5f3a\u540e\u7684KSM+\u5bf9\u6574\u4e2a\u7cfb\u7edf\u4f7f\u7528\u5185\u5b58\u7684\u5f71\u54cd\u3002\u5b9e\u9a8c\u5047\u8bbe\u7528\u6237\u6253\u5f00\u4e86\u4e00\u4e2aokular\u8fdb\u7a0b\u9605\u8bfbpdf\uff0c\u4e00\u4e2aepiphany\u6d4f\u89c8\u5668\u8fdb\u7a0b\u6d4f\u89c8\u7f51\u9875\uff0c\u4e00\u4e2aopenoffice\u8fdb\u7a0b\u5904\u7406\u6587\u6863\uff0c\u4ee5\u53ca\u4e00\u4e2a\u63a7\u5236\u53f0\u6253\u5f00\u56db\u4e2a\u6807\u7b7e(\u4e94\u4e2a\u8fdb\u7a0b)\u3002\u5b9e\u9a8c\u7528\u4e00\u4e2a\u7b80\u5355\u7684Bash\u811a\u672c\u63a7\u5236KSM+\u626b\u63cf\u8fd9\u51e0\u4e2a\u8fdb\u7a0b\u3002\u811a\u672c\u5982\u56fe5.9\u6240\u793a\u3002<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe5-9\u7528\u811a\u672c\u63a7\u5236KSM+\u5408\u5e76\u7a0b\u5e8f\u5185\u5b58<\/p>\n

 <\/p>\n

\u811a\u672c\u7684\u7b2c3\u884c\u8bbe\u7f6eKSM+\u5728sysfs\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u4f4d\u7f6e\uff0c\u7b2c4\u884c\u6307\u5b9a\u4e86KSM+\u63a5\u53d7\u7528\u6237\u6307\u793a\u626b\u63cf\u54ea\u4e9b\u8fdb\u7a0b\u7684\u6587\u4ef6\u8def\u5f84\uff0c\u7b2c5\u884c\u6307\u5b9a\u4e86\u5f00\u542f\u5173\u95edKSM+\u7684\u6587\u4ef6\u8def\u5f84\uff0c\u7b2c7\u5230\u7b2c11\u884c\u628a\u672c\u6b21\u5b9e\u9a8c\u8981\u6c42\u626b\u63cf\u7684\u8fdb\u7a0b\u540d\u901a\u77e5\u7ed9KSM+\uff0c\u7b2c12\u884c\u5f00\u542fKSM+\u8fdb\u884c\u5408\u5e76\u3002<\/p>\n

\u6bd4\u8f83\u672c\u6b21\u5b9e\u9a8c\u524d\u540e\u7cfb\u7edf\u5360\u7528\u7684\u603b\u5185\u5b58\u5982\u56fe5.10\u6240\u793a\u3002\u8ba1\u7b97\u53ef\u5f97\u7cfb\u7edf\u603b\u5360\u7528\u5185\u5b58\u5728KSM+\u5408\u5e76\u5185\u5b58\u540e\u51cf\u5c115.7MB\u3002<\/p>\n

 <\/p>\n

 <\/p>\n

\u56fe5-10 \u5408\u5e76\u5185\u5b58\u524d\u540e\u7cfb\u7edf\u5185\u5b58\u5360\u7528\u5bf9\u6bd4<\/p>\n

 <\/p>\n

\u672c\u6b21\u5b9e\u9a8c\u626b\u63cf\u7684\u516b\u4e2a\u8fdb\u7a0b\u5728\u5408\u5e76\u524d\u540e\u5360\u7528\u7684\u5185\u5b58\u5982\u88685.1\u6240\u793a\u3002\u4ece\u88685.1\u7684\u6570\u636e\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u5927\u591a\u6570Linux\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u5e76\u6ca1\u6709\u5927\u91cf\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\u3002\u5bf9\u6bd4\u4ece\u88685.1\u5f97\u5230\u7684\u8282\u7701\u5185\u5b58\u91cf\u7684\u6570\u636e\u4e3a11.7MB\uff0c\u800c\u4e0e\u4ece\u56fe5.10\u5f97\u5230\u7684\u6570\u636e\u4e3a5.7MB\uff0c\u5bfc\u81f4\u5b83\u4eec\u4e4b\u95f4\u67096MB\u7684\u5dee\u8ddd\u90e8\u5206\u56e0\u4e3a\u7cfb\u7edf\u4e2d\u5176\u5b83\u7a0b\u5e8f\u7684\u5f71\u54cd\uff0c\u90e8\u5206\u56e0\u4e3aKSM\u672c\u8eab\u6240\u6d88\u8017\u7684\u5185\u5b58\u3002<\/p>\n

 <\/p>\n

 <\/p>\n

\u88685-1 \u5185\u5b58\u5408\u5e76\u6548\u679c\u8868(\u5355\u4f4d\uff1aMB)<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

\u8fdb\u7a0b\u540d<\/p>\n<\/td>\n

\n

\u5408\u5e76\u524d<\/p>\n<\/td>\n

\n

\u5408\u5e76\u540e<\/p>\n<\/td>\n

\n

\u8282\u7701\u5185\u5b58<\/p>\n<\/td>\n

\n

\u5408\u5e76\u6548\u7387<\/p>\n<\/td>\n<\/tr>\n

\n

okular<\/p>\n<\/td>\n

\n

18.0<\/p>\n<\/td>\n

\n

13.4<\/p>\n<\/td>\n

\n

4.6<\/p>\n<\/td>\n

\n

25.56%<\/p>\n<\/td>\n<\/tr>\n

\n

epiphany<\/p>\n<\/td>\n

\n

42.1<\/p>\n<\/td>\n

\n

39.0<\/p>\n<\/td>\n

\n

3.1<\/p>\n<\/td>\n

\n

7.36%<\/p>\n<\/td>\n<\/tr>\n

\n

soffice.bin<\/p>\n<\/td>\n

\n

37.9<\/p>\n<\/td>\n

\n

37.7<\/p>\n<\/td>\n

\n

0.2<\/p>\n<\/td>\n

\n

0.53%<\/p>\n<\/td>\n<\/tr>\n

\n

terminal<\/p>\n<\/td>\n

\n

3.4<\/p>\n<\/td>\n

\n

3.3<\/p>\n<\/td>\n

\n

0.1<\/p>\n<\/td>\n

\n

2.94%<\/p>\n<\/td>\n<\/tr>\n

\n

bash<\/p>\n<\/td>\n

\n

2.5<\/p>\n<\/td>\n

\n

2.3<\/p>\n<\/td>\n

\n

0.2<\/p>\n<\/td>\n

\n

8.00%<\/p>\n<\/td>\n<\/tr>\n

\n

bash<\/p>\n<\/td>\n

\n

2.5<\/p>\n<\/td>\n

\n

2.4<\/p>\n<\/td>\n

\n

0.1<\/p>\n<\/td>\n

\n

4.00%<\/p>\n<\/td>\n<\/tr>\n

\n

bash<\/p>\n<\/td>\n

\n

2.5<\/p>\n<\/td>\n

\n

2.3<\/p>\n<\/td>\n

\n

0.2<\/p>\n<\/td>\n

\n

8.00%<\/p>\n<\/td>\n<\/tr>\n

\n

bash<\/p>\n<\/td>\n

\n

2.5<\/p>\n<\/td>\n

\n

2.3<\/p>\n<\/td>\n

\n

0.2<\/p>\n<\/td>\n

\n

8.00%<\/p>\n<\/td>\n<\/tr>\n

\n

\u5408\u8ba1<\/p>\n<\/td>\n

\n

111.4<\/p>\n<\/td>\n

\n

102.7<\/p>\n<\/td>\n

\n

11.7<\/p>\n<\/td>\n

\n

10.50%<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

\u672c\u5c0f\u8282\u7684\u56db\u4e2a\u5b9e\u9a8c\u8bf4\u660e\uff0cKSM+\u7b97\u6cd5\u5bf9\u4e8e\u90e8\u5206\u6709\u53ef\u89c2\u6570\u91cf\u7684\u91cd\u590d\u5185\u5b58\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u5982pdf\u9605\u8bfb\u5668okular\uff0c\u56fe\u50cf\u7f16\u8f91\u8f6f\u4ef6gimp\u6709\u660e\u663e\u7684\u8282\u7701\u5185\u5b58\u4f7f\u7528\u91cf\u7684\u4f5c\u7528\u3002\u4f46\u5bf9\u4e8e\u5185\u5b58\u4e2d\u91cd\u590d\u9875\u9762\u975e\u5e38\u5c11\u7684\u5e94\u7528\uff0c\u4e14\u672c\u8eab\u4f7f\u7528\u7684\u5185\u5b58\u91cf\u4e5f\u4e0d\u591a\u7684\u7a0b\u5e8f\uff0c\u5219\u6ca1\u6709\u592a\u5927\u7684\u610f\u4e49\u3002<\/p>\n

5.2 KSM\u4e0eKSM+\u7684\u5bf9\u6bd4 <\/h2>\n

    \u672c\u8282\u6bd4\u8f83\u4e86\u5728\u5b9e\u9645\u5b9e\u7528\u4e2dKSM\u548cKSM+\u7684\u5dee\u5f02\uff0c\u8bc1\u660eKSM+\u8fbe\u5230\u4e86\u5f53\u521d\u7684\u8bbe\u8ba1\u8981\u6c42\u3002<\/p>\n

5.2.1 \u81ea\u52a8\u91c7\u96c6\u4ee3\u66ff\u6e90\u4ee3\u7801\u7ea7\u663e\u5f0f\u6307\u5b9a<\/h3>\n

3.2.2\u5c0f\u8282\u53d9\u8ff0\u4e86\u6539\u8fdb\u524d\u7684KSM\u9700\u8981\u5728\u6e90\u4ee3\u7801\u7ea7\u663e\u5f0f\u8c03\u7528madvise\u901a\u77e5KSM\u6709\u54ea\u4e9b\u5408\u5e76\u533a\u57df\u3002\u8be5\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u9700\u7f6e\u4e3aMADV_MERGEABLE\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u5185\u5b58\u7684\u8d77\u59cb\u5730\u5740\uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u662f\u5185\u5b58\u533a\u57df\u7684\u957f\u5ea6\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4f20\u5165\u7684\u5185\u5b58\u5730\u5740\u5fc5\u987b\u6309\u9875\u9762\u7684\u5927\u5c0f\u5bf9\u9f50\uff0c\u5426\u5219madvise\u4f1a\u8fd4\u56de-1\uff0c\u9519\u8bef\u4fe1\u606f\u4e3a“Invalid argument”\u3002\u4e3a\u4fdd\u8bc1\u5185\u5b58\u5730\u5740\u6309\u9875\u9762\u5927\u5c0f\u5bf9\u9f50\uff0c\u53ef\u4f7f\u7528\u51fd\u6570posix_memalign\u3002\u8be5\u51fd\u6570\u5728\u5934\u6587\u4ef6sys\/mman.h\u4e2d\u58f0\u660e\uff0c\u5b83\u7684\u51fd\u6570\u539f\u578b\u4e3a\uff1a<\/p>\n

int posix_memalign(void **memptr, size_t alignment, size_t size);<\/p>\n

\u7b2c\u4e00\u4e2a\u53c2\u6570\u7528\u6765\u8fd4\u56de\u51fd\u6570\u6210\u529f\u65f6\u5185\u5b58\u8d77\u59cb\u5730\u5740\uff1b\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6307\u660e\u5bf9\u9f50\u8fb9\u754c\u7684\u503c\uff0c\u5b83\u5fc5\u987b\u662f2\u7684\u6574\u6570\u6b21\u65b9\uff1b\u7b2c\u4e09\u4e2a\u53c2\u6570\u6307\u660e\u5185\u5b58\u533a\u57df\u7684\u5927\u5c0f\u3002\u8be5\u51fd\u6570\u5728\u6210\u529f\u65f6\u8fd4\u56de0\u503c\uff0c\u5931\u8d25\u65f6\u8fd4\u56de\u9519\u8bef\u7801\uff0c\u4f46\u4e0d\u8bbe\u7f6e\u5168\u5c40\u9519\u8beferrno\u3002<\/p>\n

\u800c\u6539\u8fdb\u8fc7\u7684KSM+\u901a\u8fc7sysfs\u6587\u4ef6\u7cfb\u7edf\u6307\u5b9a\u7a0b\u5e8f\u540d\u5373\u53ef\uff0c\u7528\u6237\u4e0d\u5fc5\u8981\u4fee\u6539\u4ee3\u7801\uff0c\u4e5f\u4e0d\u5fc5\u8003\u8651\u6307\u5b9a\u5185\u5b58\u533a\u57df\uff0cKSM+\u81ea\u52a8\u5bfb\u627e\u53ef\u5408\u5e76\u7684\u5185\u5b58\u9875\u9762\u3002<\/p>\n

5.2.2 \u66f4\u7701\u5185\u5b58<\/h3>\n

KSM\u4e3a\u6307\u5b9a\u5185\u5b58\u533a\u57df\u7684\u6bcf\u4e00\u4e2a\u9875\u9762\u751f\u6210\u4e00\u4e2armap_item\uff0c\u800c\u6539\u8fdb\u540e\u4f1a\u5728\u5408\u5e76\u5931\u8d25\u65f6\u6536\u56dermap_item\uff0c\u91ca\u653e\u5b83\u5360\u7528\u7684\u5185\u5b58\u3002\u5728\u5185\u6838\u5bf9x86_64\u5904\u7406\u5668\u67b6\u6784\u7684\u5b9e\u73b0\u4ee3\u7801\u4e2d\uff0c\u4e00\u4e2armap_item\u536064\u5b57\u8282\u5927\u5c0f\u3002\u5982\u679c\u6539\u8fdb\u524d\u7684KSM\u626b\u63cf100MB\u5185\u5b58\u533a\u57df\u6ca1\u6709\u4e00\u4e2a\u9875\u9762\u80fd\u591f\u5408\u5e76\u6210\u529f\uff0c\u7406\u8bba\u4e0a\u8ba1\u7b97\uff0c\u90a3\u4e48KSM\u8981\u6d88\u80171600K\u5185\u5b58\u5206\u914d\u7ed9rmap_item\u3002KSM+\u5219\u6709\u6536\u56de\u5206\u914d\u7684rmap_item\u7684\u673a\u5236\uff0c\u5408\u5e76\u5931\u8d25\u7684\u9875\u9762\u53ef\u80fd\u4f1a\u88ab\u6536\u56dermap_item\uff0c\u4e14\u5f53\u67d0\u865a\u62df\u5185\u5b58\u533a\u57df\u88ab\u8ba4\u4e3a\u6ca1\u592a\u5927\u5e0c\u671b\u5b58\u5728\u91cd\u590d\u9875\u9762\u65f6\u5219\u4e0d\u4f1a\u518d\u5206\u914drmap_item\u5230\u6b64\u533a\u57df\u3002\u5177\u4f53\u7684\u6536\u56dermap_item\u7684\u7b97\u6cd5\u89c14.1.3\u5c0f\u8282\u6240\u793a\u3002\u4f46\u56e0\u4e3a\u7533\u8bf7\u548c\u56de\u6536rmap_item\u901a\u8fc7\u5185\u6838\u7684Slab\u5c42\u8fdb\u884c\uff0c\u6539\u8fdb\u7684KSM\u4ee3\u7801\u4e2d\u7528kmem_cache_free\u5185\u6838API\u56de\u6536rmap_item\u65f6\uff0c\u53d6\u51b3\u4e8eSlab\u80fd\u591f\u5bb9\u7eb3\u591a\u5c11\u7a7a\u95f2\u7684rmap_item\uff0c\u6536\u56de\u7684rmap_item\u53ef\u80fd\u88ab\u5f7b\u5e95\u91ca\u653e\u7ed9\u64cd\u4f5c\u7cfb\u7edf\uff0c\u4e5f\u6709\u53ef\u80fd\u5e76\u6ca1\u6709\u88ab\u64cd\u4f5c\u7cfb\u7edf\u5b8c\u5168\u56de\u6536\u4e14\u80fd\u5206\u914d\u7ed9\u5176\u5b83\u5185\u6838\u4ee3\u7801\u4f7f\u7528\uff0c\u800c\u53ea\u662f\u8fd4\u56de\u7ed9\u4e86\u539f\u5148\u7684Slab\uff0c\u7b49\u5f85\u4e0b\u4e00\u6b21\u5206\u914drmap_item\u65f6Slab\u80fd\u591f\u8fc5\u901f\u5730\u628a\u95f2\u7f6e\u5730rmap_item\u8fd4\u56de\u7ed9\u7533\u8bf7\u8005\u3002\u66f4\u8be6\u7ec6\u7684\u53d9\u8ff0\u89c12.1.5\u5c0f\u8282\u3002\u4f46\u901a\u8fc7\u6bd4\u8f83rmap_item\u7684\u6570\u91cf\uff0c\u53ef\u4ee5\u53d1\u73b0\u6539\u8fdb\u540eKSM\u4f7f\u7528\u66f4\u5c11\u7684rmap_item\u3002<\/p>\n

5.2.3 \u5b9e\u9a8c\u9a8c\u8bc1<\/h3>\n

\u4e0b\u9762\u7528\u4e00\u4e2a\u5b9e\u9a8c\u7a0b\u5e8f\u6bd4\u8f83KSM\u4e0eKSM+\u7684\u4e0d\u540c\u3002\u8be5\u7a0b\u5e8f\u53bb\u6389\u65e0\u5173\u4ee3\u7801\u548c\u51fa\u9519\u5904\u7406\u4ee3\u7801\u540e\u7684\u6838\u5fc3\u4ee3\u7801\u7247\u65ad\u5982\u56fe5-11\u6240\u793a\uff1a<\/p>\n

<\/p>\n

\u56fe5-11 KSM\u4e0eKSM+\u5bf9\u6bd4\u5b9e\u9a8c\u7528\u7a0b\u5e8f\u4ee3\u7801<\/p>\n

 <\/p>\n

\u7b2c1\u884c\u4ee3\u7801\u6307\u5b9a\u4e86\u4e00\u4e2a100MB\u5927\u5c0f\u7684\u6570\u503c\u3002\u7b2c3\u884c\u548c\u7b2c4\u884c\u5728\u5806\u4e0a\u5206\u914d\u4e86\u4e24\u5757\u5185\u5b58\uff0c\u5b83\u4eec\u7684\u8d77\u59cb\u5730\u5740\u90fd\u4ee5\u4e00\u4e2a\u9875\u9762\u7684\u5927\u5c0f\u5bf9\u9f50\uff1b\u7b2c9-12\u884c\u786e\u4fdd\u4e24\u5757\u5185\u5b58\u6ca1\u6709\u5185\u5bb9\u76f8\u540c\u7684\u9875\u9762\uff1b\u7b2c13\u884c\u8bbe\u7f6e\u7b2c\u4e00\u5757\u5185\u5b58\u7684\u524d1MB\u5168\u662f0xff\uff0c\u5373\u524d256\u4e2a\u9875\u9762\u90fd\u662f\u51681\u9875\u9762\uff1b\u7b2c14\u884c\u8bbe\u7f6e\u7b2c\u4e8c\u5757\u5185\u5b58\u7684\u524d256\u4e2a\u9875\u9762\u90fd\u662f\u51681\u9875\u9762\uff1b\u7b2c15\u884c\u901a\u77e5KSM\u9700\u8981\u5408\u5e76\u7b2c\u4e00\u4e2a\u5185\u5b58\u533a\u57df\u4e2d\u7684\u91cd\u590d\u5185\u5b58\u3002<\/p>\n

\u8fd9\u6bb5\u7a0b\u5e8f\u5206\u914d\u4e86\u4e24\u4e2a\u533f\u540d\u5185\u5b58\u533a\u57df\u3002\u5b83\u4eec\u90fd\u662f100MB\u5927\u5c0f\uff0c\u537321500\u4e2a\u9875\u9762\u3002\u4e24\u4e2a\u5185\u5b58\u533a\u57df\u52a0\u5728\u4e00\u8d77\u5171\u670951200\u4e2a\u9875\u9762\uff0c\u5176\u4e2d512\u4e2a\u9875\u9762\u662f\u51681\u9875\u9762\uff0c\u5176\u5b83\u7684\u9875\u9762\u90fd\u5404\u4e0d\u76f8\u540c\u3002\u53ef\u89c1\uff0c\u8fd9\u4e24\u4e2a\u5185\u5b58\u533a\u57df\u7684\u91cd\u590d\u9875\u9762\u5bc6\u5ea6\u90fd\u5f88\u4f4e\uff0c\u5e73\u5747\u4e00\u767e\u4e2a\u9875\u9762\u91cc\u624d\u6709\u4e00\u4e2a\u9875\u9762\u53ef\u4ee5\u88ab\u5408\u5e76\u3002\u672c\u5b9e\u9a8c\u7a0b\u5e8f\u7279\u610f\u53ea\u628a\u5176\u4e2d\u4e00\u4e2a\u5185\u5b58\u533a\u57df\u6ce8\u518c\u7ed9KSM\uff0c\u7528\u4ee5\u8bf4\u660eKSM\u53ea\u80fd\u5408\u5e76\u5728\u6e90\u4ee3\u7801\u7ea7\u522b\u88ab\u663e\u793a\u8981\u6c42\u5408\u5e76\u7684\u5185\u5b58\u533a\u57df\u3002\u53e6\u5916\uff0c\u672c\u5b9e\u9a8c\u8fd8\u65e8\u5728\u8bf4\u660eKSM+\u6bd4KSM\u66f4\u7701\u5185\u5b58\u3002\u6309\u7167\u524d\u4e24\u8282\u7684\u7406\u8bba\u5206\u6790\uff0c KSM\u53ea\u80fd\u5408\u5e76\u7b2c\u4e00\u4e2a\u5185\u5b58\u533a\u57df\u4e2d\u7684256\u4e2a\u91cd\u590d\u9875\u9762\uff0c\u5374\u6d88\u801725600\u4e2armap_item\uff0c\u6d6a\u8d39\u638964*(25600-256)\/1024\u5b57\u8282\uff0c\u53731584KB\u5185\u5b58\u3002\u800cKSM+\u80fd\u5408\u5e76\u4e24\u4e2a\u5185\u5b58\u533a\u95f4\u7684512\u4e2a\u51681\u9875\u9762\uff0c\u51e0\u8f6e\u626b\u63cf\u8fc7\u540e\uff0c\u6d88\u8017\u7684rmap_item\u4f1a\u8fdc\u6bd4KSM\u5c11\u3002KSM+\u9664\u4e86\u6709512\u4e2armap_item\u94fe\u63a5\u5728KSM+\u7a33\u5b9a\u6811\u7684\u7ed3\u70b9\u4e0a\uff0c\u8fd8\u9700\u8981\u4e00\u4e9brmap_item\u7528\u6765\u5468\u671f\u6027\u91c7\u6837\u5185\u5b58\u533a\u57df\uff0c\u4f46\u5e94\u8fdc\u8fdc\u5c0f\u4e8eKSM\u5206\u914d\u7684rmap_item\u7684\u6570\u91cf\u3002<\/p>\n

\u7531\u88685-2\u7684\u6570\u636e\u8bc1\u5b9e\u4e86\u4e4b\u524d\u7684\u7406\u8bba\u63a8\u5bfc\uff1a\uff081\uff09KSM\u53ea\u80fd\u5408\u5e761MB\u5185\u5b58\uff0c\u56e0\u4e3a\u53ea\u6709\u6ce8\u518c\u4e86\u7684\u5185\u5b58\u533a\u57df\u624d\u80fd\u6267\u884c\u5408\u5e76\u7684\u903b\u8f91\uff1b\u800cKSM+\u81ea\u52a8\u53d1\u73b0\u4e86\u6240\u6709\u6709\u91cd\u590d\u9875\u9762\u7684\u5185\u5b58\u533a\u57df\uff0c\u6240\u4ee5\u5408\u5e76\u4e862MB\u5185\u5b58\u3002\uff082\uff09 KSM\u626b\u63cf\u7684\u5185\u5b58\u533a\u57df\u7684\u5927\u5c0f\u53ea\u6709\u5927\u7ea6KSM+\u626b\u63cf\u7684\u5185\u5b58\u533a\u57df\u5927\u5c0f\u7684\u4e00\u534a\uff0c\u4f46KSM\u4f7f\u7528\u7684rmap_item\u5374\u6bd4KSM+\u8981\u591a\u5f97\u591a\uff0c\u76f4\u63a5\u5bfc\u81f4\u5408\u5e76\u540e\u7cfb\u7edf\u6d88\u8017\u7684\u5185\u5b58\u6570\u91cf\u6bd4\u5408\u5e76\u524d\u8fd8\u8981\u591a0.6MB\uff0c\u4f46KSM+\u4f7f\u5f97\u7cfb\u7edf\u603b\u6d88\u8017\u5185\u5b58\u67091.3MB\u7684\u4e0b\u964d\u3002\u7ecf\u7b80\u5355\u7684\u8ba1\u7b97\u53ef\u4ee5\u770b\u51faKSM+\u5408\u5e76\u4e862MB\u5927\u5c0f\u7684\u91cd\u590d\u9875\u9762\uff0c\u81ea\u8eab\u6d88\u8017\u4e86\u5927\u7ea60.7MB\u5185\u5b58\u7a7a\u95f4\u3002\u56e0\u6b64\uff0c\u53ef\u4ee5\u5f97\u51fa\u7ed3\u8bba\u662f\uff1aKSM+\u80fd\u81ea\u52a8\u627e\u5230\u53ef\u4ee5\u5408\u5e76\u7684\u5185\u5b58\u9875\u9762\uff0c\u5e76\u4e14\u5728\u5e94\u5bf9\u91cd\u590d\u9875\u9762\u975e\u5e38\u7a00\u5c11\u7684\u8fdb\u7a0b\u65f6\uff0c\u4ecd\u7136\u80fd\u51cf\u5c11\u7cfb\u7edf\u7684\u603b\u5185\u5b58\u4f7f\u7528\u91cf\u3002\u800cKSM\u53ea\u5408\u5e76\u5728\u6e90\u4ee3\u7801\u4e2d\u663e\u793a\u6307\u5b9a\u7684\u5185\u5b58\u533a\u57df\uff0c\u800c\u4e14\u5728\u5e94\u5bf9\u91cd\u590d\u9875\u9762\u975e\u5e38\u7a00\u5c11\u7684\u8fdb\u7a0b\u65f6\uff0c\u53ef\u80fd\u4e0d\u4ec5\u6ca1\u80fd\u964d\u4f4e\u5185\u5b58\u4f7f\u7528\uff0c\u76f8\u53cd\u8fd8\u4f1a\u589e\u52a0\u7cfb\u7edf\u7684\u5185\u5b58\u4f7f\u7528\u3002<\/p>\n

 <\/p>\n

\u88685-2 KSM\u548cKSM+\u7684\u6bd4\u8f83<\/p>\n\n\n\n\n\n
\n

 <\/p>\n<\/td>\n

\n

\u5408\u5e76\u524d\u7cfb\u7edf\u6240\u7528\u5185\u5b58<\/p>\n<\/td>\n

\n

\u5408\u5e76\u540e\u7cfb\u7edf\u6240\u7528\u5185\u5b58<\/p>\n<\/td>\n

\n

\u5408\u5e76\u524d\u7a0b\u5e8f\u6240\u7528\u5185\u5b58<\/p>\n<\/td>\n

\n

\u5408\u5e76\u540e\u7a0b\u5e8f\u6240\u7528\u5185\u5b58<\/p>\n<\/td>\n

\n

\u5408\u5e76\u540ermap_item\u6570\u91cf<\/p>\n<\/td>\n<\/tr>\n

\n

KSM<\/p>\n<\/td>\n

\n

334.4MB<\/p>\n<\/td>\n

\n

235.0MB<\/p>\n<\/td>\n

\n

200.1MB<\/p>\n<\/td>\n

\n

199.1MB<\/p>\n<\/td>\n

\n

25600<\/p>\n<\/td>\n<\/tr>\n

\n

KSM+<\/p>\n<\/td>\n

\n

325.8MB<\/p>\n<\/td>\n

\n

324.5MB<\/p>\n<\/td>\n

\n

200.1MB<\/p>\n<\/td>\n

\n

198.1MB<\/p>\n<\/td>\n

\n

1027<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

5.3 \u91cd\u590d\u9875\u9762\u7684\u7edf\u8ba1\u5206\u6790 <\/h2>\n

\u4e3a\u4e86\u80fd\u8fdb\u4e00\u6b65\u6539\u8fdbKSM+\uff0c\u540c\u65f6\u4e5f\u53ef\u9a8c\u8bc15.1.2\u5c0f\u8282\u7684\u5b9e\u9a8c\u7ed3\u679c\u3002\u672c\u8282\u7528\u4e00\u4e2a\u4e13\u95e8\u7684\u5185\u6838\u6a21\u5757\u6765\u7edf\u8ba1\u7a0b\u5e8f\u7684\u91cd\u590d\u9875\u9762\u7684\u6570\u91cf\u548c\u91cd\u590d\u9875\u9762\u7684\u5185\u5bb9\u3002\u901a\u8fc7\u5206\u6790\u7edf\u8ba1\u6570\u636e\uff0c\u53ef\u4ee5\u53d1\u73b0Linux\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u4e2d\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u4e00\u4e9b\u7279\u70b9\u3002<\/p>\n

5.3.1 \u7f16\u5199\u7edf\u8ba1\u91cd\u590d\u9875\u9762\u7684\u5185\u6838\u6a21\u5757<\/h3>\n

\u75315.1.2\u5c0f\u8282\u7684\u5b9e\u9a8c\u53ef\u77e5\u5404\u4e2a\u7a0b\u5e8f\u4e4b\u95f4\u5408\u5e76\u5185\u5b58\u9875\u7684\u6548\u679c\u6709\u8f83\u5927\u7684\u5dee\u5bfc\u3002\u4e3a\u4e86\u6301\u7eed\u6539\u8fdbKSM+\u7684\u5408\u5e76\u6548\u7387\uff0c\u53ef\u4ee5\u4ece\u5206\u6790\u8fd9\u4e9b\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u91cd\u590d\u9875\u9762\u7684\u7279\u70b9\u7740\u624b\u3002\u6bd4\u5982\uff0c\u91cd\u590d\u6b21\u6570\u6700\u591a\u7684\u662f\u54ea\u4e2a\u9875\u9762\uff0c\u91cd\u590d\u4e86\u591a\u5c11\u6b21\uff0c\u6bcf\u4e2a\u91cd\u590d\u9875\u9762\u7684\u5185\u5bb9\u662f\u4ec0\u4e48\uff0c\u54ea\u4e9b\u5e38\u7528\u5e94\u7528\u6709\u8f83\u591a\u7684\u91cd\u590d\u9875\u9762\u3002\u4e3a\u4e86\u7edf\u8ba1\u8fd9\u4e2a\u4fe1\u606f\uff0c\u53ef\u4ee5\u5728\u76ee\u524dKSM+\u4ee3\u7801\u7684\u57fa\u7840\u4e0a\u4fee\u6539\uff0c\u589e\u52a0\u7edf\u8ba1\u4fe1\u606f\u7684\u529f\u80fd\uff0c\u4f46\u8fd9\u6837\u4f1a\u8ba9KSM+\u7684\u4ee3\u7801\u53d8\u5f97\u66f4\u52a0\u590d\u6742\u3002\u8003\u8651\u5230\u5185\u6838\u4ee3\u7801\u96be\u4ee5\u8c03\u8bd5\u7684\u7279\u70b9\uff0c\u672c\u5de5\u7a0b\u628a\u7edf\u8ba1\u91cd\u590d\u9875\u9762\u7684\u529f\u80fd\u72ec\u7acb\u51fa\u6765\u4f5c\u4e3a\u4e00\u4e2a\u5355\u72ec\u7684\u6a21\u5757\u3002\u8fd9\u6837\u7684\u597d\u5904\u662f\uff1a\u7b2c\u4e00\uff0c\u72ec\u7acb\u7684\u6a21\u5757\u6613\u4e8e\u8c03\u8bd5\uff0c\u51fa\u9519\u51e0\u7387\u4f4e\uff1b\u7b2c\u4e8c\uff0c\u53ea\u4e13\u6ce8\u4e8e\u505a\u7edf\u8ba1\u4fe1\u606f\u8fd9\u4e00\u4e2a\u7b80\u5355\u7684\u529f\u80fd\uff0c\u4e0d\u5fc5\u50cfKSM+\u4e2d\u7684\u4ee3\u7801\u4e00\u6837\u5fc5\u987b\u9632\u6b62\u5206\u914d\u8fc7\u591a\u5185\u5b58\uff0c\u5f53\u6709\u8db3\u591f\u591a\u7684\u5185\u5b58\u53ef\u4f9b\u4f7f\u7528\u65f6\uff0c\u4ee3\u7801\u7f16\u5199\u7684\u96be\u5ea6\u5927\u5927\u964d\u4f4e\uff1b\u7b2c\u4e09\uff0c\u5355\u72ec\u6a21\u5757\u7684\u7edf\u8ba1\u7ed3\u679c\u53ef\u4ee5\u548cKSM+\u4ee3\u7801\u7684\u76f8\u5173\u7ed3\u679c\u4f5c\u5bf9\u6bd4\uff0c\u534f\u52a9\u6392\u9664\u7a0b\u5e8f\u7684\u9519\u8bef\u3002<\/p>\n

\u8be5\u7edf\u8ba1\u6a21\u5757\u8bbe\u8ba1\u7684\u76ee\u6807\u662f\u8ba9\u7528\u6237\u65b9\u4fbf\u5730\u6307\u5b9a\u7edf\u8ba1\u54ea\u4e9b\u7a0b\u5e8f\uff0c\u7edf\u8ba1\u6a21\u5757\u8f93\u51fa\u6240\u6709\u7684\u91cd\u590d\u9875\u9762\u7684\u91cd\u590d\u6b21\u6570\uff0c\u4ee5\u53ca\u6709\u591a\u5c11\u9875\u9762\u6ca1\u6709\u91cd\u590d\u9875\u9762\u3002\u8be5\u7edf\u8ba1\u6a21\u5757\u4e0e\u7528\u6237\u4ea4\u4e92\u7684\u90e8\u5206\u7684\u9700\u6c42\u548cKSM+\u7684\u7528\u6237\u4ea4\u4e92\u9700\u6c42\u4e00\u81f4\uff0c\u6240\u4ee5\u6cbf\u7528\u4e86\u8bbe\u8ba1KSM+\u65f6\u7684\u529e\u6cd5\uff1a\u8ba9\u7528\u6237\u901a\u8fc7sysfs\u6587\u4ef6\u7cfb\u7edf\u4e0e\u6a21\u5757\u4ea4\u4e92\uff0c\u6307\u5b9a\u7edf\u8ba1\u54ea\u4e9b\u7a0b\u5e8f\u3002\u7ea6\u5b9a\u7684\u683c\u5f0f\u4e5f\u4fdd\u6301\u4e00\u81f4\uff0c\u5373\u5199\u5165“+ \u7a0b\u5e8f\u540d”\u5373\u901a\u77e5\u6a21\u5757\u7edf\u8ba1\u54ea\u4e2a\u7a0b\u5e8f\uff0c\u5199\u5165“- \u7a0b\u5e8f\u540d”\u5373\u901a\u77e5\u6a21\u5757\u64a4\u6d88\u7edf\u8ba1\u54ea\u4e2a\u7a0b\u5e8f\u3002<\/p>\n

\u7edf\u8ba1\u90e8\u5206\u7684\u601d\u8def\u662f\uff1a\u521d\u5efa\u4e00\u68f5\u7ea2\u9ed1\u6811\u3002\u6bcf\u626b\u63cf\u4e00\u4e2a\u9875\u9762\uff0c\u8ba1\u7b97\u51fa\u8be5\u9875\u9762\u7684MD5\u503c\uff0c\u4ee5\u8be5MD5\u503c\u4e3a\u7d22\u5f15\u63d2\u5165\u7ea2\u9ed1\u6811\u3002\u5982\u679c\u6811\u4e2d\u6ca1\u6709\u8be5MD5\u503c\uff0c\u5219\u589e\u52a0\u4e00\u4e2a\u7ed3\u70b9\u63d2\u5165\u5230\u6811\u4e2d\uff0c\u7ed3\u70b9\u7684\u8ba1\u6570\u7f6e\u4e3a1\u3002\u5982\u679c\u6811\u4e2d\u5df2\u7ecf\u5b58\u5728\u8be5MD5\u503c\uff0c\u5219\u7ed9\u5bf9\u5e94\u7ed3\u70b9\u7684\u8ba1\u6570\u589e\u52a01\u3002\u8be5\u8ba1\u6570\u5219\u662f\u91cd\u590d\u9875\u9762\u7684\u8ba1\u6570\u3002<\/p>\n

\u867d\u7136\u7edf\u8ba1\u6a21\u5757\u548cKSM\u4e2d\u4e00\u6837\u90fd\u7528\u4e86\u7ea2\u9ed1\u6811\u7684\u6570\u636e\u7ed3\u6784\uff0c\u4f46KSM\u4e2d\u7684\u6811\u7684\u7d22\u5f15\u662f\u7528\u4e86\u9875\u9762\u7684\u5185\u5bb9\u3002\u5982\u679c\u9875\u9762\u7684\u5185\u5bb9\u53d1\u751f\u53d8\u5316\uff0c\u5219\u7ea2\u9ed1\u6811\u4f1a\u90e8\u5206\u65e0\u6548\u3002KSM\u4e2d\u7684\u4e0d\u7a33\u5b9a\u6811\u7684\u89e3\u51b3\u65b9\u6848\u662f\u6bcf\u8f6e\u626b\u63cf\u90fd\u91cd\u5efa\u4e0d\u7a33\u5b9a\u6811\u3002\u800c\u7a33\u5b9a\u6811\u7684\u89e3\u51b3\u65b9\u6848\u662f\u5199\u4fdd\u62a4\u7a33\u5b9a\u6811\u4e2d\u7684\u9875\u9762\u3002\u5728\u672c\u7edf\u8ba1\u6a21\u5757\u4e2d\uff0c\u4ee5\u626b\u63cf\u65f6\u8ba1\u7b97\u5f97\u5230\u7684MD5\u503c\u4e3a\u7d22\u5f15\uff0c\u5373\u4f7f\u5728\u626b\u63cf\u8fc7\u540e\uff0c\u9875\u9762\u7684\u503c\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u4f46\u4e4b\u524d\u626b\u63cf\u5f97\u5230\u7684MD5\u503c\u5e76\u4e0d\u4f1a\u88ab\u91cd\u65b0\u8ba1\u7b97\uff0c\u8fd9\u6837\u5c31\u4fdd\u8bc1\u4e86\u6811\u4ecd\u7136\u662f\u6709\u6548\u7684\u3002\u7406\u8bba\u4e0a\uff0c\u867d\u7136\u8fd9\u6837\u7684\u89e3\u51b3\u65b9\u6848\u5f97\u5230\u7684\u7edf\u8ba1\u7ed3\u679c\u4f1a\u548c\u771f\u5b9e\u60c5\u51b5\u6709\u5c0f\u5c0f\u7684\u5dee\u8ddd\uff0c\u4f46\u56e0\u4e3a\u6574\u4e2a\u7edf\u8ba1\u8fc7\u7a0b\u53d1\u751f\u5728\u6781\u77ed\u7684\u65f6\u95f4\u91cc\uff0c\u800c\u5728\u5f88\u77ed\u7684\u65f6\u95f4\u5185\u53d1\u751f\u53d8\u5316\u7684\u9875\u9762\u53ea\u662f\u6781\u5c11\u6570\uff0c\u5e76\u4e0d\u5f71\u54cd\u7edf\u8ba1\u6570\u636e\u7684\u4ee3\u8868\u6027\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u5982\u679cKSM\u4e2d\u7684\u7ea2\u9ed1\u6811\u7528MD5\u503c\u4f5c\u4e3a\u7d22\u5f15\uff0c\u5219\u4f1a\u7ed9\u6bcf\u4e2a\u9875\u9762\u5e26\u676516\u4e2a\u5b57\u8282\u7684\u989d\u5916\u5185\u5b58\u5f00\u9500\u3002\u6b64\u5916\uff0cMD5\u503c\u5b58\u5728\u5b89\u5168\u6027\u95ee\u9898[35]\u3002\u6240\u4ee5KSM\u4e2d\u7684\u7ea2\u9ed1\u6811\u548c\u7edf\u8ba1\u6a21\u5757\u4e2d\u7684\u7ea2\u9ed1\u6811\u91c7\u7528\u4e0d\u540c\u7684\u7d22\u5f15\u65b9\u6848\u3002<\/p>\n

\u5f53\u5168\u90e8\u9875\u9762\u626b\u63cf\u7ed3\u675f\u540e\uff0c\u7ea2\u9ed1\u6811\u4e0a\u7684\u6bcf\u4e00\u4e2a\u7ed3\u70b9\u5219\u8bb0\u5f55\u4e86\u5bf9\u5e94\u7684\u9875\u9762\u7684\u91cd\u590d\u6b21\u6570\u3002\u672c\u5de5\u7a0b\u4f7f\u7528\u5806\u6392\u5e8f\u7684\u65b9\u6cd5\u628a\u91cd\u590d\u7684\u9875\u9762\u6b21\u6570\u6309\u987a\u5e8f\u6392\u5217\u3002\u6267\u884c\u5806\u6392\u5e8f\u65f6\u9700\u8981\u4e00\u68f5\u5b8c\u5168\u4e8c\u53c9\u6811\uff0c\u800c\u7ea2\u9ed1\u6811\u5e76\u4e0d\u662f\u5b8c\u5168\u4e8c\u53c9\u6811\u3002\u672c\u5de5\u7a0b\u7684\u89e3\u51b3\u601d\u8def\u662f\uff1a\u8ba1\u7b97\u5f97\u5230\u7ea2\u9ed1\u6811\u5171\u6709n\u4e2a\u7ed3\u70b9\uff0c\u518d\u5206\u914d\u4e00\u4e2a\u6709n\u4e2a\u5143\u7d20\u7684\u4e00\u7ef4\u6570\u7ec4\uff0c\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u4e00\u4e2a\u6307\u9488\u3002\u904d\u5386\u7ea2\u9ed1\u6811\uff0c\u4f9d\u6b21\u628a\u4e00\u7ef4\u6570\u7ec4\u4e0a\u7684\u6bcf\u4e2a\u65e0\u7d20\u6307\u5411\u7ea2\u9ed1\u6811\u4e0a\u7684\u7ed3\u70b9\u3002\u81f3\u6b64\uff0c\u8fd9\u4e2a\u4e00\u7ef4\u6570\u7ec4\u5b58\u50a8\u4e86\u4e00\u68f5\u5b8c\u5168\u4e8c\u53c9\u6811\u3002\u4e8e\u662f\uff0c\u5bf9\u8be5\u5b8c\u5168\u4e8c\u53c9\u6811\u4f7f\u7528\u4e00\u6b21\u5806\u6392\u5e8f\u540e\uff0c\u8be5\u4e00\u7ef4\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u5373\u6309\u91cd\u590d\u9875\u9762\u6b21\u6570\u4ece\u5c0f\u5230\u5927\u6216\u4ece\u5927\u5230\u5c0f\u6392\u5217\u4e86\u3002<\/p>\n

\u8be5\u7edf\u8ba1\u6a21\u5757\u88ab\u547d\u540d\u4e3aparser.ko\u3002<\/p>\n

5.3.1\u91cd\u590d\u9875\u9762\u7684\u7edf\u8ba1\u5206\u6790<\/h3>\n

\u57285.1.2\u5c0f\u8282\u4e2d\uff0c\u5b9e\u9a8c\u53d1\u73b0pdf\u9605\u8bfb\u5de5\u5177okular\u548c\u56fe\u50cf\u7f16\u8f91\u5de5\u5177gimp\u6709\u6bd4\u8f83\u591a\u7684\u91cd\u590d\u5185\u5bb9\u9875\u9762\uff0cepiphany\u6d4f\u89c8\u5668\u6d4f\u89c8\u7f51\u9875\u65f6\u7684\u91cd\u590d\u9875\u9762\u4e5f\u6709\u4e00\u5b9a\u6570\u91cf\uff0copenoffice\u7684\u91cd\u590d\u9875\u9762\u8f83\u5c11\u3002\u672c\u5c0f\u8282\u7528\u7edf\u8ba1\u6a21\u5757\u5206\u6790\u57285.1.2\u5c0f\u8282\u7684\u5b9e\u9a8c\u4e2d\u6d4b\u8bd5\u8fc7\u7684\u7a0b\u5e8f\u3002<\/p>\n

\u5206\u6790\u4e00\u3002\u672c\u6b21\u6d4b\u8bd5\u4e5f\u8fd0\u884c\u7a0b\u5e8fokular\u7684\u56db\u4e2a\u8fdb\u7a0b\u5b9e\u4f8b\uff0c\u6253\u5f00\u56db\u4e2a\u4e0d\u540c\u7684pdf\u6587\u6863\uff0c\u5404\u968f\u673a\u9605\u8bfb\u4e00\u4e9b\u9875\u9762\u3002\u4e4b\u540e\u7528\u547d\u4ee4“insmod parser.ko”\u628a\u7edf\u8ba1\u6a21\u5757\u63d2\u5165\u5185\u6838\uff0c\u518d\u8f6c\u5230\/sys\/kernel\/mm\/parser\u76ee\u5f55\uff0c\u7528\u547d\u4ee4“echo + okular > processes_to_scan”\u901a\u77e5parser\u6a21\u5757\u91c7\u96c6\u7a0b\u5e8f\u540d\u4e3aokular\u7684\u8fdb\u7a0b\u7684\u9875\u9762\u4fe1\u606f\uff0c\u6700\u540e\u8bfb\u6587\u4ef6statistics\u5373\u5f97\u5230\u7edf\u8ba1\u4fe1\u606f\u3002\u672c\u6b21\u8f93\u51fa\u5982\u56fe5-12\u6240\u793a\u3002<\/p>\n

\u56fe5-12\u6240\u793a\u7684\u7b2c\u4e00\u680f\u662f\u91cd\u590d\u9875\u9762\u7684\u6b21\u6570\uff0c\u7b2c\u4e8c\u680f\u662f\u8be5\u91cd\u590d\u9875\u9762\u7684MD5\u503c\u3002\u53ef\u4ee5\u660e\u663e\u770b\u5230okular\u7684\u5185\u5b58\u4e2d\u7edd\u5927\u591a\u6570\u9875\u9762\u4e0d\u662f\u91cd\u590d\u7684\uff0c\u5373\u8be5\u56fe\u7684\u6700\u540e\u4e00\u884c\u6240\u793a13249\u4e2a\u9875\u9762\u6ca1\u6709\u91cd\u590d\uff0c\u800c\u91cd\u590d\u9875\u9762\u7684\u5206\u5e03\u975e\u5e38\u96c6\u4e2d\uff0c\u6392\u540d\u7b2c\u4e00\u7684\u91cd\u590d\u9875\u9762\u67092746\u9875\uff0c\u5360\u6240\u6709\u9875\u9762\u768416%\u3002\u800c\u5176\u5b83\u7684\u6240\u6709\u91cd\u590d\u9875\u9762\u5168\u90e8\u52a0\u4e0a\u4e5f\u53ea\u6709565\u4e2a\u9875\u9762\uff0c\u6570\u91cf\u4e0a\u53ea\u6709\u6392\u540d\u7b2c\u4e00\u768420.6%\u3002\u6392\u540d\u524d\u4e09\u7684\u91cd\u590d\u9875\u9762\u51713217\u9879\uff0c\u5360\u636e\u4e86\u6240\u6709\u91cd\u590d\u9875\u9762\u768497.2%\u3002\u7406\u8bba\u4e0a\u5408\u5e76\u8fd93311\u4e2a\u91cd\u590d\u9875\u9762\u53ef\u4ee5\u5408\u5e76\u523027\u4e2a\u9875\u9762\uff0c\u56e0\u6b64\u53ef\u8282\u7701(3311-27)*4KB\uff0c\u537313136KB\u5185\u5b58\uff0c\u4e0e\u5b9e\u9a8c\u4e00\u7684\u6570\u636e\u57fa\u672c\u4e00\u81f4\u3002<\/p>\n

\u56e0\u4e3a\u628a\u4e00\u4e2a\u9875\u9762\u7684\u5185\u5bb9\u6253\u5370\u5728\u5c4f\u5e55\u4e0a\u9700\u89818192\u4e2a\u5b57\u7b26\uff0c\u8fd9\u4e2a\u6570\u91cf\u975e\u5e38\u5927\uff0c\u6240\u4ee5\u7edf\u8ba1\u6a21\u5757\u628a\u9875\u9762\u7684\u5185\u5bb9\u6253\u5370\u5230\u4e86\u5185\u6838\u65e5\u5fd7\u6587\u4ef6\u4e2d\u3002\u67e5\u770b\/var\/log\/kern.log\u6587\u4ef6\uff0c\u53ef\u4ee5\u770b\u5230\uff0c\u6392\u540d\u7b2c\u4e00\u7684\u91cd\u590d\u9875\u9762\u662f\u6240\u6709\u6bd4\u7279\u4f4d\u88ab\u7f6e1\u7684\u9875\u9762\uff0c\u79f0\u4e3a\u51681\u9875\u9762\uff1b\u6392\u540d\u7b2c\u4e8c\u7684\u91cd\u590d\u9875\u9762\u662f\u6240\u6709\u6bd4\u7279\u4f4d\u88ab\u7f6e0\u7684\u9875\u9762\uff0c\u79f0\u4e3a\u51680\u9875\u9762\uff1b\u6392\u540d\u7b2c\u4e09\u7684\u91cd\u590d\u9875\u9762\u4ee532\u4e2a\u5b57\u8282\u7684\u957f\u5ea6\u4e3a\u5468\u671f\u5faa\u73af\uff0c\u6bcf\u4e2a\u5468\u671f\u4e3a\u4e00\u4e32\u5947\u602a\u7684\u5b57\u8282\u3002\u8054\u60f3\u5230\u767d\u8272\u7684RGB\u503c\u662f(255,255,255)\uff0c\u9ed1\u8272\u7684RGB\u503c\u662f(0,0,0)\uff0c\u800cpdf\u9605\u8bfb\u5668\u663e\u793a\u6587\u7ae0\u65f6\u6709\u5f88\u5927\u4e00\u90e8\u5206\u7684\u767d\u8272\u533a\u57df\uff0c\u4ee5\u6b64\u4e3a\u6839\u636e\u672c\u8bba\u6587\u8ba4\u4e3a\u6392\u540d\u7b2c\u4e00\u548c\u7b2c\u4e8c\u7684\u5927\u91cf\u7684\u91cd\u590d\u9875\u9762\u548c\u7a0b\u5e8f\u7684\u56fe\u5f62\u663e\u793a\u6709\u5173\u3002<\/p>\n

 <\/p>\n

<\/p>\n

\u56fe5-12 \u56db\u4e2aokular\u8fdb\u7a0b\u7684\u91cd\u590d\u9875\u9762\u7edf\u8ba1<\/p>\n

 <\/p>\n

\u5206\u6790\u4e8c\u3002\u6b64\u6b21\u6d4b\u8bd5\u4e0e5.1.2\u8282\u4e2d\u7684\u5b9e\u9a8c\u4e8c\u4e00\u6837\uff0c\u7528gimp\u6253\u5f00\u4e94\u5f20\u56fe\u7247\u3002\u5206\u6790\u7ed3\u679c\u663e\u793agimp\u4e2d\u7684\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\u5206\u5e03\u8f83\u4e4bokular\u8981\u5206\u6563\u5f97\u591a\u3002\u5171\u626b\u63cf\u4e8623012\u4e2a\u9875\u9762\uff0c\u5176\u4e2d3702\u4e2a\u9875\u9762\u662f\u91cd\u590d\u9875\u9762\u3002\u5728\u5206\u6790okular\u7a0b\u5e8f\u7684\u5206\u6790\u4e00\u4e2d\u6392\u540d\u7b2c\u4e00\uff0c\u5360\u636e\u4e86\u603b\u9875\u9762\u768416%\u7684\u51681\u9875\u9762\u5728\u5206\u6790gimp\u7684\u6d4b\u8bd5\u4e2d\u4ec5\u6709\u533a\u533a6\u4e2a\u91cd\u590d\u6b21\u6570\u3002\u539f\u6392\u540d\u7b2c\u4e8c\u7684\u51680\u9875\u9762\u5728\u6b64\u6b21\u6d4b\u8bd5\u4e2d\u6392\u540d\u7b2c\u4e00\u4f4d\uff0c\u9875\u9762\u603b\u5171\u91cd\u590d\u4e861029\u6b21\u3002\u6392\u540d\u7b2c\u4e8c\u4f4d\u7684\u9875\u9762\u91cd\u590d\u4e86796\u6b21\uff0c\u8fd9\u4e2a\u9875\u9762\u51e0\u4e4e\u662f\u51680\u9875\uff0c\u53ea\u6709\u5c11\u6570\u51e0\u4e2a\u5b57\u8282\u4e0d\u662f0\uff0c\u6392\u540d\u7b2c\u4e09\u5230\u7b2c\u4e94\u7684\u9875\u9762\u5747\u91cd\u590d\u4e86100\u6b21\u4ee5\u4e0a\uff0c\u9875\u9762\u7684\u5185\u5bb9\u662f\u4e00\u4e9b\u7279\u6b8a\u5185\u5bb9\u7684\u5b57\u8282\u5faa\u73af\u586b\u5145\u4e86\u6574\u4e2a\u9875\u9762\u3002\u6b64\u5916\uff0c\u91cd\u590d\u6b21\u6570\u572810\u6b21\u4ee5\u4e0a\uff0c100\u6b21\u4ee5\u4e0b\u7684\u9875\u9762\u670913\u4e2a\uff1b\u91cd\u590d\u6b21\u6570\u5728\u4e24\u6b21\u4ee5\u4e0a(\u5305\u62ec\u4e24\u6b21)\uff0c10\u6b21\u4ee5\u4e0b\u7684\u9875\u9762\u6709166\u4e2a\u3002\u7406\u8bba\u4e0a\u5408\u5e76\u8fd9\u4e9b\u91cd\u590d\u9875\u9762\u53ef\u4ee5\u8282\u7701(3702-5-13-166)*4KB\uff0c\u537314072KB\uff0c\u4e0e\u5b9e\u9a8c\u4e8c\u7684\u6570\u636e\u57fa\u672c\u4e00\u81f4\u3002<\/p>\n

\u5206\u6790\u4e09\u3002\u6b64\u6b21\u6d4b\u8bd5\u5bf9\u5e945.1.2\u8282\u4e2d\u7684\u5b9e\u9a8c\u4e09\uff0c\u7528epiphany\u4ee5\u8131\u673a\u72b6\u6001\u6253\u5f00\u56db\u4e2a\u7f51\u9875\u3002\u5206\u6790\u7ed3\u679c\u663e\u793a\u4e00\u5171\u626b\u63cf\u523021165\u4e2a\u9875\u9762\uff0c\u6709688\u4e2a\u91cd\u590d\u9875\u9762\uff0c\u5360\u603b\u9875\u9762\u6570\u76843.2%\u3002\u5360\u636e\u91cd\u590d\u9875\u9762\u6b21\u6570\u7b2c\u4e00\u4f4d\u7684\u662f\u51680\u9875\u9762\uff0c\u5171\u6709366\u4e2a\u51680\u9875\uff1b\u6392\u540d\u7b2c\u4e8c\u4f4d\u7684\u662f\u51681\u9875\u9762\uff0c\u517129\u4e2a\u51681\u9875\uff1b\u6392\u540d\u7b2c\u4e09\u4f4d\u7684\u5171\u670913\u4e2a\u91cd\u590d\u9875\uff0c\u8fd9\u4e2a\u91cd\u590d\u9875\u9762\u7684\u5185\u5bb9\u4e3a\u4ee5\u56db\u5b57\u8282\u4e3a\u5468\u671f\u4e0d\u65ad\u91cd\u590d“FFFFFF00”\uff1b\u5176\u5b83\u91cd\u590d\u9875\u9762\u7684\u91cd\u590d\u6b21\u6570\u90fd\u662f5\u6b21\u4ee5\u4e0b\uff0c\u91cd\u590d5\u6b21\u7684\u67091\u4e2a\uff0c\u91cd\u590d4\u6b21\u7684\u67093\u4e2a\uff0c\u91cd\u590d3\u6b21\u7684\u670953\u4e2a\uff0c\u91cd\u590d\u4e24\u6b21\u7684\u670952\u4e2a\u3002\u7406\u8bba\u4e0a\u5408\u5e76\u8fd9\u4e9b\u91cd\u590d\u9875\u9762\u53ef\u4ee5\u8282\u7701(688-3-1-3-53-52)*4KB\uff0c\u53732304KB\uff0c\u4e0e\u5b9e\u9a8c\u4e09\u7684\u6570\u636e\u57fa\u672c\u4e00\u81f4\u3002<\/p>\n

\u4ee5\u4e0a\u4e09\u4e2a\u5b9e\u4f8b\u5206\u6790\u9a8c\u8bc1\u4e865.1.2\u5c0f\u8282\u4e2d\u6539\u8fdb\u540e\u7684KSM\u7b97\u6cd5\u57fa\u672c\u4e0a\u5408\u5e76\u4e86\u6240\u6709\u7684\u91cd\u590d\u9875\u9762\u3002\u53e6\u5916\u4ece\u672c\u8282\u4e5f\u53ef\u4ee5\u770b\u5230\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u91cd\u590d\u9875\u9762\u7684\u4e00\u4e9b\u7279\u70b9\u30021.\u51680\u548c\u51681\u7684\u7279\u6b8a\u9875\u9762\u5360\u4e86\u91cd\u590d\u9875\u9762\u7684\u7edd\u5927\u90e8\u5206\u30022.\u5176\u5b83\u91cd\u590d\u9875\u9762\u4e5f\u591a\u6709\u5468\u671f\u89c4\u5f8b\uff0c\u662f\u4ee5\u4e00\u5b9a\u957f\u5ea6\u5185\u5bb9\u4e3a\u5468\u671f\u4e0d\u65ad\u91cd\u590d\u586b\u5145\u4e86\u6574\u4e2a\u9875\u9762\u30023.\u7a0b\u5e8f\u4e0e\u7a0b\u5e8f\u4e4b\u95f4\u91cd\u590d\u9875\u9762\u6240\u5360\u603b\u9875\u9762\u7684\u6bd4\u4f8b\u6709\u8f83\u5927\u53d8\u5316\u3002\u8fd9\u4e9b\u89c4\u5f8b\u4e3a\u8fdb\u4e00\u6b65\u6539\u8fdbKSM\u7684\u7b97\u6cd5\u63d0\u4f9b\u4e86\u90e8\u5206\u601d\u8def\u3002<\/p>\n

5.4 \u672c\u7ae0\u5c0f\u7ed3<\/h2>\n

\u672c\u7ae0\u901a\u8fc7\u5b9e\u9a8c\u9a8c\u8bc1\u4e86\u7528\u6237\u53ef\u4ee5\u65b9\u4fbf\u5730\u6307\u5b9aKSM+\u5408\u5e76\u7a0b\u5e8f\u7684\u76f8\u540c\u5185\u5b58\u9875\u9762\u3002\u5b9e\u9a8c\u7ed3\u679c\u663e\u793aKSM+\u5bf9\u90e8\u5206\u5b58\u5728\u6bd4\u8f83\u591a\u91cd\u590d\u5185\u5b58\u7684\u7a0b\u5e8f\u7684\u5408\u5e76\u6548\u679c\u660e\u663e\u3002\u7136\u540e\uff0c\u672c\u7ae0\u7528\u4e00\u4e2a\u5b9e\u9a8c\u5bf9KSM\u548cKSM+\u505a\u4e86\u6bd4\u8f83\u3002\u5b9e\u9a8c\u8bc1\u660eKSM+\u8fbe\u5230\u4e86\u8bbe\u8ba1\u7684\u76ee\u7684\uff0c\u5728\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u7684\u5e94\u7528\u573a\u666f\u4e0b\uff0cKSM+\u8f83\u4e4bKSM\u66f4\u65b9\u4fbf\u4e5f\u66f4\u7701\u5185\u5b58\u3002\u6700\u540e\uff0c\u8fd8\u7f16\u5199\u4e86\u4e00\u4e2a\u4e13\u95e8\u7edf\u8ba1\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u5185\u6838\u6a21\u5757\uff0c\u5bf9Linux\u684c\u9762\u73af\u5883\u4e0b\u7684\u5e38\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\u60c5\u51b5\u8fdb\u884c\u7edf\u8ba1\u5206\u6790\uff0c\u63ed\u793a\u4e86\u8fd9\u4e9b\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u4e00\u4e9b\u7279\u70b9\uff0c\u5bf9\u6301\u7eed\u6539\u8fdbKSM+\u63d0\u4f9b\u4e86\u4f9d\u636e\u3002<\/p>\n

 <\/p>\n

\u7b2c\u516d\u7ae0 \u603b\u7ed3\u4e0e\u5c55\u671b<\/h1>\n

6.1 \u5168\u6587\u603b\u7ed3    <\/h2>\n

 \u6d3b\u8dc3\u7684Linux\u793e\u533a\u4e3a\u987a\u5e94\u4e91\u8ba1\u7b97\uff0c\u865a\u62df\u5316\u7684\u5174\u8d77\uff0c\u5728\u5185\u6838\u4e3b\u5e72\u4ee3\u7801\u4e2d\u52a0\u5165\u4e86\u5185\u6838\u81ea\u5df1\u7684\u865a\u62df\u673a\u6a21\u5757KVM\u3002\u7d27\u63a5\u7740\uff0c\u4e3a\u89e3\u51b3\u865a\u62df\u673a\u4e4b\u95f4\u8fd0\u884c\u540c\u6837\u7684\u64cd\u4f5c\u7cfb\u7edf\u6216\u8005\u5927\u578b\u670d\u52a1\u5668\u7a0b\u5e8f\u5e26\u6765\u7684\u5927\u91cf\u91cd\u590d\u5185\u5b58\u7684\u95ee\u9898\uff0c\u5185\u6838\u4e2d\u53c8\u52a0\u5165\u5408\u5e76\u865a\u62df\u673a\u7a0b\u5e8f\u4e2d\u91cd\u590d\u9875\u9762\u7684\u6a21\u5757KSM\u3002\u76ee\u524d\u5927\u91cf\u5bf9KSM\u7684\u7814\u7a76\u96c6\u4e2d\u5728\u865a\u62df\u5316\u7684\u573a\u666f\uff0c\u5b9e\u9645\u4e0aKSM\u4e5f\u53ef\u4ee5\u5e94\u7528\u5728\u684c\u9762\u73af\u5883\u4e2d\u3002\u672c\u6587\u5728KSM\u7684\u57fa\u7840\u4e0a\u4e13\u95e8\u9488\u5bf9Linux\u684c\u9762\u73af\u5883\u8bbe\u8ba1\u5e76\u5b9e\u73b0\u4e86KSM+\uff0c\u80fd\u65b9\u4fbf\u6709\u6548\u5730\u5408\u5e76\u684c\u9762\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\u3002<\/p>\n

\u8bba\u6587\u7684\u4e3b\u8981\u5de5\u4f5c\u4f53\u73b0\u5728\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\uff1a<\/p>\n

\uff081\uff09\u8be6\u7ec6\u7814\u7a76\u4e86Linux\u5185\u6838\u7684\u5185\u5b58\u7ba1\u7406\u5b50\u7cfb\u7edf\u4ee5\u53caLinux\u5185\u6838\u5f00\u53d1\u7684\u76f8\u5173\u6280\u672f\u3002<\/p>\n

\uff082\uff09\u8be6\u7ec6\u5206\u6790\u4e86KSM\u6a21\u5757\u7684\u5b9e\u73b0\u539f\u7406\u548c\u9875\u9762\u5408\u5e76\u6280\u672f\u3002<\/p>\n

\uff083\uff09\u589e\u5f3a\u5e76\u6539\u8fdb\u4e86KSM\u5e94\u7528\u5728\u684c\u9762Linux\u73af\u5883\u4e0b\u7684\u529f\u80fd\u3002\u6539\u8fdb\u540e\u7684KSM+\u80fd\u8ba9\u7528\u6237\u65b9\u4fbf\u5730\u6307\u5b9a\u9700\u8981\u5408\u5e76\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u7a0b\u5e8f\u3002\u5e76\u4e14\uff0cKSM+\u6bd4\u6539\u8fdb\u524d\u66f4\u8282\u7701\u5185\u5b58\u3002\u8bba\u6587\u7528\u5927\u91cf\u7684\u5b9e\u9a8c\u9a8c\u8bc1\u4e86KSM+\u5408\u5e76\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\u7684\u5b9e\u9645\u6548\u679c\uff0c\u5e76\u8bbe\u8ba1\u5b9e\u9a8c\u6bd4\u8f83\u4e86KSM\u548cKSM+\u3002<\/p>\n

\uff084\uff09\u7f16\u5199\u4e86\u7528\u4e8e\u7edf\u8ba1\u5e94\u7528\u7a0b\u5e8f\u5185\u5b58\u4e2d\u91cd\u590d\u9875\u9762\u6570\u91cf\u7684\u5185\u6838\u6a21\u5757\u3002\u901a\u8fc7\u5bf9\u5e94\u7528\u7a0b\u5e8f\u4e2d\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u7edf\u8ba1\u5206\u6790\uff0c\u4e3a\u6301\u7eed\u6539\u8fdbKSM+\u63d0\u4f9b\u4e86\u4f9d\u636e\u548c\u7ebf\u7d22\u3002<\/p>\n

6.2 \u672a\u6765\u5c55\u671b<\/h2>\n

       KSM+\u5bf9\u7cfb\u7edf\u6027\u80fd\u7684\u5f71\u54cd\u6709\u5f85\u8fdb\u4e00\u6b65\u7814\u7a76\u3002\u6bd4\u5982\uff0c\u867d\u7136KSM+\u6d88\u8017\u7684\u5904\u7406\u5668\u8d44\u6e90\u548c\u914d\u7f6e\u53c2\u6570\u6709\u5173\uff0c\u4f46\u7a76\u7adf\u6d88\u8017\u5904\u7406\u5668\u8d44\u6e90\u7684\u60c5\u51b5\u5982\u4f55\uff0c\u56e0\u4e3a\u65f6\u95f4\u5173\u7cfb\uff0c\u672c\u8bba\u6587\u8fd8\u6ca1\u6709\u8fd9\u65b9\u9762\u7684\u5b9e\u9a8c\u6570\u636e\u3002\u53e6\u5916\uff0cKSM+\u5728\u5408\u5e76\u4e86\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u9875\u9762\u4e4b\u540e\u5bf9\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u6709\u591a\u5927\u7684\u5f71\u54cd\uff0c\u4e5f\u6ca1\u6709\u8fd9\u65b9\u9762\u7684\u5b9e\u9a8c\u6570\u636e\u3002<\/p>\n

KSM+\u8fd8\u6709\u5f88\u591a\u53ef\u4ee5\u7814\u7a76\u548c\u6539\u8fdb\u7684\u65b9\u5411\u3002\u6bd4\u5982\u901a\u8fc7\u94a9\u5b50\u6280\u672f\u76d1\u89c6\u865a\u62df\u5185\u5b58\u533a\u57df(VMA)\u7684\u521b\u5efa\uff0c\u9500\u6bc1\uff0c\u53d8\u52a8\uff0c\u53ef\u4ee5\u8ba9KSM+\u66f4\u5feb\u901f\u7684\u53d1\u73b0VMA\u7684\u53d8\u5316\u3002\u53e6\u5916\uff0cKSM+\u53ef\u4ee5\u4ece\u5355\u673a\u7a0b\u5e8f\u6269\u5c55\u5230\u6709\u670d\u52a1\u7aef\u7684\u7f51\u7edc\u7a0b\u5e8f\u3002\u670d\u52a1\u7aef\u901a\u8fc7\u6536\u96c6\u5927\u91cf\u5e38\u7528\u5e94\u7528\u7684\u91cd\u590d\u9875\u9762\u60c5\u51b5\uff0c\u6839\u636e\u8fd9\u4e9b\u91cd\u590d\u4fe1\u606f\u7cbe\u51c6\u5730\u901a\u77e5\u5ba2\u6237\u7aef\u5e94\u8be5\u5728\u54ea\u4e9b\u5e94\u7528\u7a0b\u5e8f\u7684VMA\u4e2d\u641c\u7d22\u91cd\u590d\u9875\u9762\uff0c\u4ece\u800c\u907f\u514d\u5728\u91cd\u590d\u5185\u5b58\u975e\u5e38\u5c11\u7684\u5185\u5b58\u533a\u57df\u6d88\u8017\u5927\u91cf\u7684\u5904\u7406\u5668\u8d44\u6e90\u3002<\/p>\n

\u867d\u7136\u8ba1\u7b97\u673a\u786c\u4ef6\u4e0d\u65ad\u98de\u901f\u53d1\u5c55\uff0c\u4f46\u8f6f\u4ef6\u4e5f\u8d8a\u6765\u8d8a\u5360\u7528\u66f4\u591a\u7684\u5185\u5b58\u3002\u5185\u5b58\u8d44\u6e90\u4ecd\u7136\u662f\u8ba1\u7b97\u673a\u7cfb\u7edf\u4e2d\u7a00\u7f3a\u7684\u8d44\u6e90\u3002\u53c8\u56e0\u4e3a\u5e94\u7528\u7a0b\u5e8f\u6d88\u8017\u7684\u5185\u5b58\u8d8a\u6765\u8d8a\u591a\uff0c\u7a0b\u5e8f\u4e4b\u95f4\u5b58\u5728\u76f8\u540c\u5185\u5bb9\u9875\u9762\u7684\u51e0\u7387\u4e5f\u968f\u4e4b\u589e\u5927\u3002\u5982\u679c\u80fd\u518d\u964d\u4f4eKSM+\u5728\u5408\u5e76\u76f8\u540c\u9875\u9762\u7684\u8fc7\u7a0b\u4e2d\u6d88\u8017\u7684\u5904\u7406\u5668\u8d44\u6e90\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u5728\u5360\u636e\u4e86\u6d88\u8d39\u7535\u5b50\u7c7b\u5e02\u573a\u76f8\u5f53\u5e02\u573a\u4efd\u989d\u7684Android\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u79fb\u690d\u8be5\u6280\u672f\uff0c\u5bf9\u4e8e\u5176\u5b83\u57fa\u4e8eLinux\u7684\u64cd\u4f5c\u7cfb\u7edf\u4e5f\u662f\u5982\u6b64\uff0c\u5bf9KSM+\u6280\u672f\u7684\u7814\u7a76\u6709\u7740\u5e7f\u6cdb\u7684\u5e94\u7528\u524d\u666f\u3002<\/p>\n

6.3 \u672c\u7ae0\u5c0f\u7ed3<\/h2>\n

\u672c\u7ae0\u603b\u7ed3\u4e86\u5168\u6587\u7684\u4e3b\u8981\u5185\u5bb9\uff0c\u5bf9\u4e3b\u8981\u5de5\u4f5c\u8fdb\u884c\u4e86\u5f52\u7eb3\uff0c\u5e76\u6307\u51fa\u4e86\u8fdb\u4e00\u6b65\u6539\u8fdbKSM+\u7684\u65b9\u5411\u548c\u672a\u6765\u7684\u5e94\u7528\u524d\u666f\u3002<\/p>\n<\/div>\n

\n

\u53c2\u8003\u6587\u732e<\/h1>\n

[1] \u4fde\u7532\u5b50\uff0c\u77f3\u51e1\uff0c\u6f58\u7231\u6c11.\u7a0b\u5e8f\u5458\u7684\u81ea\u6211\u4fee\u517b\uff0c\u94fe\u63a5\u3001\u88c5\u8f7d\u3001\u4e0e\u5e93.\u7535\u5b50\u5de5\u4e1a\u51fa\u7248\u793e\uff0c2010.<\/p>\n

[2] \u674e\u70e8. \u4e91\u8ba1\u7b97\u7684\u53d1\u5c55\u7814\u7a76. \u7855\u58eb\u8bba\u6587.\u5317\u4eac\u90ae\u7535\u5927\u5b66.3.2011<\/p>\n

[3] A. Binu, G. Santhosh Kumar. Virtualization Techniques: A Methodical Review of XEN and KVM.  Communications in Computer and Information Science, v 190 CCIS, n PART 1, p 399-410, 2011<\/p>\n

[4] Jin, Guohua1; Mellor-Crummey, John1.Improving performance by reducing the memory footprint of scientific applications. International Journal of High Performance Computing Applications,2005,19 433-451<\/p>\n

[5] Carl A. Waldspurger, Memory resource management in VMware ESX server, ACM SIGOPS Operating Systems Review, v.36 n.SI, Winter 2002 <\/a><\/p>\n

[6] Eto, Mikinon1 ; Umeno, Hidenori1.Design and implementation of content based page sharing method in Xen for the International Conference on Control, Automation and Systems (ICCAS) 2008<\/p>\n

[7] C.-R. Chang, J.-J. Wu, and P. Liu. An empirical study on memory sharing of virtual machines for server consolidation. In Proceedings of the 2011 IEEE Ninth International Symposium on Parallel and Distributed Processing with Applications, ISPA ’11, Washington, DC, USA, 2011. IEEE Computer Society.<\/p>\n

[8] Timothy Wood , Gabriel Tarasuk-Levin , Prashant Shenoy , Peter Desnoyers , Emmanuel Cecchet , Mark D. Corner, Memory buddies: exploiting page sharing for smart colocation in virtualized data centers, Proceedings of the 2009 ACM SIGPLAN\/SIGOPS international conference on Virtual execution environments, March 11-13, 2009, Washington, DC, USA<\/a><\/p>\n

[9] Prateek Sharma and Purushottam Kulkarni. Singleton: system-wide page deduplication in virtual environments. In Proceedings of the 21st international symposium on High-Performance Parallel and Distributed Computing, HPDC '12, pages 15-26. ACM, 2012.<\/p>\n

[10] Yagi, T., Artho, C., Suzaki, K., Iijima, K.: Effects of memory randomization, sanitization and page cache on memory deduplication. In: European Workshop on System Security, EuroSec 2012<\/p>\n

[11] Suzaki, K., Iijima, K., Yagi, T., Artho, C.: Memory deduplication as a threat to the guest os. In: Proceedings of the Fourth European Workshop on System Security, EUROSEC 2011, pp. 1:1–1:6. ACM, New York ,2011<\/p>\n

[12] K. Suzaki, K. Iijima, T. Yagi, and C. Artho. Software side channel attack on memory deduplication. SOSP POSTER, 2011.<\/p>\n

[13] Rauschmayr, Nathalie, and Achim Streit. Reducing the Memory Footprint of Parallel Applications with KSM. Facing the Multicore-Challenge III. Springer Berlin Heidelberg, 2013. 48-59.<\/p>\n

[14] International Data Corporation. Android and iOS Combine for 91.1% of the Worldwide Smartphone OS Market in 4Q12 and 87.6% for the Year. <\/p>\n

http:\/\/www.idc.com\/getdoc.jsp?containerId=prUS23946013<\/p>\n

[15] Bovet, Daniel P.\/ Cesati, Marco <\/a>.Understanding The Linux Kernel.3rd edition. Oreilly & Associates Inc.2005<\/p>\n

[16] \u8d75\u70af. Linux\u5185\u6838\u5b8c\u5168\u5256\u6790. \u673a\u68b0\u5de5\u4e1a\u51fa\u7248\u793e.2006<\/p>\n

[17] Jonathan Corbet: Transparent huge pages in 2.6.38 http:\/\/lwn.net\/Articles\/423584\/<\/a> 2011<\/p>\n

[18] \u5218\u7acb\u5706,\u4e8e\u677e\u6ce2,\u5415\u6653\u5a34. Linux \u865a\u62df\u5185\u5b58\u7ba1\u7406.\u6570\u5b57\u6280\u672f\u4e0e\u5e94\u7528.2011<\/p>\n

[19] \u6bdb\u5fb7\u64cd\uff0c\u80e1\u5e0c\u660e. Linux\u5185\u6838\u6e90\u4ee3\u7801\u60c5\u666f\u5206\u6790. \u6d59\u6c5f\u5927\u5b66\u51fa\u7248\u793e, 2001.<\/p>\n

[20] \u9648\u9e23\u6625,\u6f58\u91d1\u8d35<\/a>.\u4e00\u4e2a\u57fa\u4e8eIA-64\u4f53\u7cfb\u7684\u5185\u5b58\u7ba1\u7406\u5927\u9875\u9762\u7684\u5b9e\u73b0\u6a21\u578b.\u8ba1\u7b97\u673a\u79d1\u5b66.2007,4: 276\u2015278<\/p>\n

[21] Claudia Salzberg Rodriguez,Gordon Fischer,Steven Smolski <\/a>.  The Linux Kernel Primer : A Top-Down Approach for x86 and PowerPC Architectures<\/a>. Prentice Hall PTR<\/a>. 2006<\/p>\n

[22] \u674e\u6bc5.Slab\u5185\u5b58\u5206\u914d\u7b56\u7565\u4e0e\u79fb\u690d.\u8ba1\u7b97\u673a\u6280\u672f\u4e0e\u53d1\u5c55.2007.<\/p>\n

[23] Robert Love. Linux Kernel Development. 3rd Edition. <\/a>Addison-Wesley Professional<\/a>.2011<\/p>\n

[24] Wolfgang Mauerer <\/a>. Professional Linux Kernel Architecture<\/a>. Wrox<\/a>.2010<\/p>\n

[25] \u6d2a\u6c38\u5b66<\/a>,\u4f59\u7ea2\u82f1<\/a>,\u59dc\u4e16\u6770<\/a>,\u6797\u4e3d\u84c9<\/a>.Linux\u5185\u6838\u8c03\u8bd5\u6280\u672f\u7684\u65b9\u6cd5\u7814\u7a76.\u7535\u5b50\u6d4b\u8bd5.2012.<\/p>\n

[26]Jonathan Corbet,Alessandro Rubini,Greg Kroah-Hartman<\/a>.Linux Device Drivers.3rd edition. Oreilly & Associates Inc.2005<\/p>\n

[27] wikipedia: KGDB. http:\/\/en.wikipedia.org\/wiki\/KGDB<\/a><\/p>\n

[28] KIVITY, A., KAMAY, Y., LAOR, D., LUBLIN, U., AND LIGUORI, A. KVM: the linux virtual machine monitor. In Ottawa Linux Symposium (July 2007), pp. 225–230.<\/p>\n

[29]Jonathan Corbet: \/dev\/ksm: dynamic memory sharing. http:\/\/lwn.net\/Articles\/306704\/<\/a> 2008<\/p>\n

[30]  Jonathan Corbet: KSM tries again. http:\/\/lwn.net\/Articles\/330589\/<\/a> 2009<\/p>\n

[31] The Linux Kernel Organization, Inc. How to use the Kernel Samepage Merging feature. https:\/\/www.kernel.org\/doc\/Documentation\/vm\/ksm.txt<\/a> <\/p>\n

[32] Kerrisk, M.: Linux programmer’s manual. 2012<\/p>\n

http:\/\/man7.org\/linux\/man-pages\/man2\/madvise.2.html<\/a><\/p>\n

[33] Arcangeli, A., Eidus, I., Wright, C.: Increasing memory density by using KSM. In:<\/p>\n

OLS 2009: Proceedings of the Linux Symposium, pp. 19–28 (July 2009)<\/p>\n

[34] Bayer, R.: Symmetric binary b-trees: Data structure and maintenance algorithms.<\/p>\n

Acta Informatica 1, 290–306 ,1972<\/p>\n

[35] Sasaki, Y., Aoki, K.: Finding Preimages in Full MD5 Faster Than Exhaustive Search. In: Joux, A. (ed.) EUROCRYPT 2009. LNCS, vol. 5479, pp. 134–152.<\/p>\n

 <\/p>\n

\u81f4    \u8c22<\/h1>\n

      \u672c\u8bba\u6587\u662f\u5728\u5bfc\u5e08\u738b\u5e38\u5409\u526f\u6559\u6388\u7684\u6089\u5fc3\u6307\u5bfc\u4e0b\u5b8c\u6210\u7684\u3002\u4ece\u9009\u9898\u5230\u6700\u540e\u7684\u7ec8\u7a3f\uff0c\u738b\u8001\u5e08\u4e00\u4e1d\u4e0d\u82df\u5730\u5bf9\u6211\u7684\u8bba\u6587\u5de5\u4f5c\u8fdb\u884c\u6307\u5bfc\uff0c\u63d0\u51fa\u4e86\u5f88\u591a\u5b9d\u8d35\u7684\u610f\u89c1\u3002\u8c28\u5728\u6b64\u5411\u738b\u8001\u5e08\u8868\u793a\u8877\u5fc3\u7684\u611f\u8c22\u3002<\/p>\n

\u611f\u8c22\u963f\u91cc\u5df4\u5df4\u516c\u53f8\u7684\u5de5\u7a0b\u5e08\u674e\u51e1\u5e0c\uff0c\u548c\u91d1\u5c71\u5b89\u5168\u516c\u53f8\u7684\u5de5\u7a0b\u5e08\u9879\u67f1\u7ed9\u4e88\u7684\u6280\u672f\u4e0a\u7684\u5efa\u8bae\u548c\u610f\u89c1\u3002<\/p>\n

\u611f\u8c22Linux\u5185\u6838\u90ae\u4ef6\u5217\u8868\u7684\u5404\u4f4d\u4e0d\u77e5\u540d\u5f00\u53d1\u8005\u63d0\u4f9b\u7684\u5e2e\u52a9\u3002<\/p>\n

\u611f\u8c22\u7236\u6bcd\u5728\u6211\u8c03\u8bd5\u5185\u6838\u4ee3\u7801\u6700\u56f0\u96be\u65f6\u671f\u7ed9\u4e88\u7684\u7cbe\u795e\u4e0a\u548c\u540e\u52e4\u4e0a\u7684\u5927\u529b\u652f\u6301\u3002<\/p>\n

\u611f\u8c22\u5f90\u5929\u6c60\u540c\u5b66\uff0c\u97e6\u5b87\u540c\u5b66\uff0c\u848b\u6b63\u9633\u540c\u5b66\uff0c\u9ad8\u9759\u4f1f\u540c\u5b66\u7b49\u5404\u4f4d\u540c\u5b66\u63d0\u4f9b\u7684\u5404\u79cd\u5e2e\u52a9\u3002<\/p>\n<\/div>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

\u628a\u6211\u7684\u6bd5\u4e1a\u8bba\u6587\u653e\u4e0a\u6765\uff0c\u76f4\u63a5\u4eceword\u590d\u5236\uff0c\u6240\u4ee5\u56fe\u7247\u4f1a\u4e22\u5931\u3002 \u5728\u8fd9\u91cc\u53ef\u4ee5\u4e0b\u8f7d\u539f\u7a3f www.ykyi.net\/upload\/Research_and_Implementation_of_Memory_Deduplication_in_the_Linux_Desktop_Environment.pdf \u4e2d\u5c71\u5927\u5b66\u7855\u58eb\u5b66\u4f4d\u8bba\u6587 Linux\u684c\u9762\u73af\u5883\u4e0b\u5185\u5b58\u53bb\u91cd\u6280\u672f\u7684. based on KSM \u7814\u7a76\u4e0e\u5b9e\u73b0 Research and Implementation of Memory Deduplication in The Linux Desktop Environment   \u5b66\u4f4d\u7533\u8bf7\u4eba\uff1a \u5468\u9704 \u5bfc\u5e08\u59d3\u540d\u53ca\u804c\u79f0\uff1a \u738b\u5e38\u5409\u526f\u6559\u6388         \u8bba\u6587\u539f\u521b\u6027\u58f0\u660e \u672c\u4eba\u90d1\u91cd\u58f0\u660e\uff1a\u6240\u5448\u4ea4\u7684\u5b66\u4f4d\u8bba\u6587\uff0c\u662f\u672c\u4eba\u5728\u5bfc\u5e08\u7684\u6307\u5bfc\u4e0b\uff0c\u72ec\u7acb\u8fdb\u884c\u7814\u7a76\u5de5\u4f5c\u6240\u53d6\u5f97\u7684\u6210\u679c\u3002\u9664\u6587\u4e2d\u5df2\u7ecf\u6ce8\u660e\u5f15\u7528\u7684\u5185\u5bb9\u5916\uff0c\u672c\u8bba\u6587\u4e0d\u5305\u542b\u4efb\u4f55\u5176\u4ed6\u4e2a\u4eba\u6216\u96c6\u4f53\u5df2\u7ecf\u53d1\u8868\u6216\u64b0\u5199\u8fc7\u7684\u4f5c\u54c1\u6210\u679c\u3002\u5bf9\u672c\u6587\u7684\u7814\u7a76\u505a\u51fa\u91cd\u8981\u8d21\u732e\u7684\u4e2a\u4eba\u548c\u96c6\u4f53\uff0c\u5747\u5df2\u5728\u6587\u4e2d\u4ee5\u660e\u786e\u65b9\u5f0f\u6807\u660e\u3002\u672c\u4eba\u5b8c\u5168\u610f\u8bc6\u5230\u672c\u58f0\u660e\u7684\u6cd5\u5f8b\u7ed3\u679c\u7531\u672c\u4eba\u627f\u62c5\u3002   \u5b66\u4f4d\u8bba\u6587\u4f5c\u8005\u7b7e\u540d\uff1a \u65e5\u671f\uff1a \u5e74  \u6708  \u65e5       \u5b66\u4f4d\u8bba\u6587\u4f7f\u7528\u6388\u6743\u58f0\u660e \u672c\u4eba\u5b8c\u5168\u4e86\u89e3\u4e2d\u5c71\u5927\u5b66\u6709\u5173\u4fdd\u7559\u3001\u4f7f\u7528\u5b66\u4f4d\u8bba\u6587\u7684\u89c4\u5b9a\uff0c\u5373\uff1a\u5b66\u6821\u6709\u6743\u4fdd\u7559\u5b66\u4f4d\u8bba\u6587\u5e76\u5411\u56fd\u5bb6\u4e3b\u7ba1\u90e8\u95e8\u6216\u5176\u6307\u5b9a\u673a\u6784\u9001\u4ea4\u8bba\u6587\u7684\u7535\u5b50\u7248\u548c\u7eb8\u8d28\u7248\uff1b\u6709\u6743\u5c06\u5b66\u4f4d\u8bba\u6587\u7528\u4e8e\u975e\u8d62\u5229\u76ee\u7684\u7684\u5c11\u91cf\u590d\u5236\u5e76\u5141\u8bb8\u8bba\u6587\u8fdb\u5165\u5b66\u6821\u56fe\u4e66\u9986\u3001\u9662\u7cfb\u8d44\u6599\u5ba4\u88ab\u67e5\u9605\uff1b\u6709\u6743\u5c06\u5b66\u4f4d\u8bba\u6587\u7684\u5185\u5bb9\u7f16\u5165\u6709\u5173\u6570\u636e\u5e93\u8fdb\u884c\u68c0\u7d22\uff1b\u53ef\u4ee5\u91c7\u7528\u590d\u5370\u3001\u7f29\u5370\u6216\u5176\u4ed6\u65b9\u6cd5\u4fdd\u5b58\u5b66\u4f4d\u8bba\u6587\uff1b\u53ef\u4ee5\u4e3a\u5b58\u5728\u9986\u9645\u5408\u4f5c\u5173\u7cfb\u7684\u5144\u5f1f\u9ad8\u6821\u7528\u6237\u63d0\u4f9b\u6587\u732e\u4f20\u9012\u670d\u52a1\u548c\u4ea4\u6362\u670d\u52a1\u3002 \u4fdd\u5bc6\u8bba\u6587\u4fdd\u5bc6\u671f\u6ee1\u540e\uff0c\u9002\u7528\u672c\u58f0\u660e\u3002   \u5b66\u4f4d\u8bba\u6587\u4f5c\u8005\u7b7e\u540d\uff1a                       \u5bfc\u5e08\u7b7e\u540d\uff1a \u65e5\u671f\uff1a  \u5e74  \u6708  \u65e5                       \u65e5\u671f\uff1a  \u5e74  \u6708  \u65e5         \u8bba\u6587\u9898\u76ee\uff1a Linux\u684c\u9762\u73af\u5883\u4e0b\u5185\u5b58\u53bb\u91cd\u6280\u672f\u7684\u7814\u7a76\u4e0e\u5b9e\u73b0 \u4e13\u4e1a\uff1a\u8f6f\u4ef6\u5de5\u7a0b  \u7855\u58eb\u751f\uff1a\u5468\u9704 \u6307\u5bfc\u6559\u5e08\uff1a\u738b\u5e38\u5409  \u6458  \u8981 \u5185\u5b58\u7ba1\u7406\u662f\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u81f3\u5173\u91cd\u8981\u7684\u90e8\u5206\u3002\u4f18\u79c0\u7684\u64cd\u4f5c\u7cfb\u7edf\u9ad8\u6548\u5730\u7ba1\u7406\u6709\u9650\u7684\u5185\u5b58\u8d44\u6e90\u3002Linux\u5185\u6838\u7684\u5185\u6838\u540c\u9875\u5408\u5e76\uff08KSM\uff09\u6a21\u5757\u662f\u5728\u865a\u62df\u5316\u5174\u8d77\u540e\u4e3a\u8282\u7701\u865a\u62df\u673a\u4f7f\u7528\u7684\u5185\u5b58\u800c\u53d1\u5c55\u7684\u4e00\u79cd\u8282\u7ea6\u5185\u5b58\u7684\u6280\u672f\u3002KSM\u901a\u8fc7\u5408\u5e76\u76f8\u540c\u5185\u5bb9\u9875\u9762\u7684\u65b9\u5f0f\u663e\u8457\u5730\u964d\u4f4e\u4e86\u591a\u4e2a\u57fa\u4e8e\u5185\u6838\u865a\u62df\u673a\uff08KVM\uff09\u6280\u672f\u7684\u865a\u62df\u673a\u540c\u65f6\u8fd0\u884c\u65f6\u7cfb\u7edf\u4f7f\u7528\u7684\u5185\u5b58\u3002\u5b9e\u9645\u4e0a\uff0cKSM\u4e5f\u80fd\u5408\u5e76\u4e00\u822c\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u76f8\u540c\u5185\u5bb9\u9875\u9762\u3002\u4f46\u4e00\u822c\u5e94\u7528\u7a0b\u5e8f\u4e3a\u4e86\u4f7f\u7528KSM\u6280\u672f\u5408\u5e76\u5185\u5b58\uff0c\u9700\u8981\u5728\u6e90\u4ee3\u7801\u7ea7\u522b\u663e\u5f0f\u5730\u8c03\u7528\u76f8\u5e94\u7684\u7cfb\u7edf\u8c03\u7528\u6765\u544a\u77e5KSM\u9700\u8981\u626b\u63cf\u7684\u5185\u5b58\u533a\u57df\u3002\u5bf9\u4e8e\u4e00\u822c\u7528\u6237\u6765\u8bf4\uff0c\u9700\u8981\u4fee\u6539\u5e94\u7528\u7a0b\u5e8f\u7684\u6e90\u4ee3\u7801\u663e\u7136\u662f\u4e00\u4e2a\u592a\u9ad8\u7684\u95e8\u69db\u3002 \u672c\u8bba\u6587\u5728\u8ba4\u771f\u7814\u7a76\u4e86KSM\u6a21\u5757\u7684\u5b9e\u73b0\u7684\u57fa\u7840\u4e0a\uff0c\u589e\u5f3a\u4e86KSM\u7684\u529f\u80fd\u3002\u65b0\u8bbe\u8ba1\u5b9e\u73b0\u7684KSM+\u4f7f\u5f97\u7528\u6237\u53ef\u4ee5\u4e0d\u5fc5\u4fee\u6539\u5e94\u7528\u7a0b\u5e8f\u7684\u6e90\u4ee3\u7801\u5c31\u80fd\u5229\u7528KSM+\u5408\u5e76\u76f8\u540c\u5185\u5bb9\u7684\u5185\u5b58\u9875\u9762\u3002\u53e6\u5916\u539f\u6765\u7684KSM\u7b97\u6cd5\u4f9d\u8d56\u7a0b\u5e8f\u6307\u5b9a\u7684\u5185\u5b58\u533a\u57df\u6709\u5927\u91cf\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\uff0c\u800c\u5b9e\u9645\u4e0a\uff0c\u4e00\u822c\u5e94\u7528\u7a0b\u5e8f\u5e76\u6ca1\u6709\u5927\u91cf\u7684\u91cd\u590d\u5185\u5b58\u3002\u5728\u91cd\u590d\u5185\u5b58\u975e\u5e38\u5c11\u7684\u60c5\u51b5\u4e0b\uff0c\u5bf9\u8fd9\u4e9b\u7a0b\u5e8f\u5e94\u7528KSM\u6280\u672f\u975e\u4f46\u4e0d\u80fd\u964d\u4f4e\u5185\u5b58\u4f7f\u7528\uff0c\u800c\u4e14\u56e0\u4e3a\u8fd0\u884cKSM\u672c\u8eab\u6240\u9700\u5185\u5b58\u800c\u589e\u52a0\u4e86\u5185\u5b58\u5f00\u9500\u3002\u672c\u8bba\u6587\u9488\u5bf9\u8fd9\u4e00\u70b9\u5728KSM\u7684\u7b97\u6cd5\u4e0a\u505a\u4e86\u6539\u8fdb\uff0c\u51cf\u5c11\u4e86\u8fd0\u884cKSM+\u7b97\u6cd5\u672c\u8eab\u6240\u6d88\u8017\u7684\u5185\u5b58\u3002\u7136\u540e\u8bba\u6587\u7528Linux\u684c\u9762\u4e0b\u7684\u5e38\u7528\u5e94\u7528\u7a0b\u5e8f\u9a8c\u8bc1\u4e86KSM+\u7684\u5b9e\u9645\u6548\u679c\uff0c\u5e76\u6784\u9020\u4e86\u4e00\u4e2a\u5b9e\u9a8c\u6bd4\u8f83\u4e86KSM\u548cKSM+\u3002\u6700\u540e\uff0c\u4e3a\u4e86\u4e86\u89e3\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u5185\u5b58\u9875\u9762\u7684\u7279\u70b9\uff0c\u8fd8\u7f16\u5199\u4e86\u4e13\u95e8\u7edf\u8ba1\u91cd\u590d\u9875\u9762\u7684\u5185\u6838\u6a21\u5757\uff0c\u53d1\u73b0\u5e94\u7528\u7a0b\u5e8f\u7684\u91cd\u590d\u9875\u9762\u7684\u4e00\u4e9b\u89c4\u5f8b\uff0c\u4e3a\u6301\u7eed\u6539\u8fdbKSM+\u63d0\u4f9b\u4e86\u4f9d\u636e\u3002   \u5173\u952e\u8bcd\uff1aKSM\uff0c\u91cd\u590d\u5185\u5b58\u5408\u5e76 \uff0c\u5185\u5b58\u7ba1\u7406   Title: Research and Implementation of Memory Deduplication in The Linux Desktop Environment Major: Software Engineering Name: Zhou Xiao Supervisor: Wang Changji Abstract Memory management is one of the most important parts of the operating system. KSM (Kernel Samepage Merging) in Linux kernel is a kind of memory saving technology developed after the emerging of virtual machine. KSM can dramatically decrease the memory usage of the hypervisor running several virtual machines. Actually, KSM can also be applied to normal applications. But in order to use the KSM, application must explicitly evoke a system call in source code level to tell KSM the memory area where the KSM will scan. To normal users, modifying the source code is impossible at most of the time. Base on the full grasp of the implementation of KSM, a new implementation named KSM+ is created, which allows users to merge same-content pages on the specified applications without modifying corresponding source code. Moreover, the original KSM algorithm relies heavily on the specified area is rich in same-content pages, while normal applications have much less same-content pages compared to virtual machines. So, when KSM is applied to those applications, it is possible that memory usage will rise rather than decrease. To combat with this situation, KSM+ employs a new algorithm to decrease the memory usage for running itself. Several experiments prove that the KSM+ can be easily applied to specified applications and memory usage can be reduced. And a case is designed to compare the effect between KSM and KSM+, which shows KSM+ behaves better in deduplication when the same-content pages’ density is very low. At last, in order to inspect the characteristics of same-content pages from normal desktop applications, an ad-hoc kernel module is developed to do the statistics which supplies significant data for the further development of KSM+. Key Words\uff1a KSM, Deduplication, Memory Management … Continue reading “\u6211\u7684\u6bd5\u4e1a\u8bba\u6587.Linux\u684c\u9762\u73af\u5883\u4e0b\u5185\u5b58\u53bb\u91cd\u6280\u672f\u7684 \u7814\u7a76\u4e0e\u5b9e\u73b0”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,7],"tags":[47,51],"class_list":["post-979","post","type-post","status-publish","format-standard","hentry","category-tech_articles","category-unix_linux","tag-ksm","tag-linux-2"],"_links":{"self":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts\/979","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=979"}],"version-history":[{"count":0,"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts\/979\/revisions"}],"wp:attachment":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=979"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=979"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=979"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}