Anon-rss 和 total-vm 是什么意思

最近，我的 Linux 机器上的 tomcat 进程突然被终止了。经过调查，我在/var/log/message 文件中发现了以下错误消息:

kernel: [1799319.246494] Out of memory: Kill process 28536 (java) score 673 or sacrifice childSep
kernel: [1799319.246506] Killed process 28536 (java) total-vm:1271568kB, anon-rss:426528kB, file-rss:0kB

现在，谁能告诉我 total-vm包含了什么，anon-rss和 rss有什么不同？

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As I understand, the size of the virtual memory that a process uses is listed as "total-vm". Part of it is really mapped into the RAM itself (allocated and used). This is "RSS".

Part of the RSS is allocated in real memory blocks (other than mapped into a file or device). This is anonymous memory ("anon-rss") and there is also RSS memory blocks that are mapped into devices and files ("file-rss").

So, if you open a huge file in vim, the file-rss would be high, on the other side, if you malloc() a lot of memory and really use it, your anon-rss would be high also.

On the other side, if you allocate a lot of space (with malloc()), but nevers use it, the total-vm would be higher, but no real memory would be used (due to the memory overcommit), so, the rss values would be low.


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