Linux anon-rss 和 total-vm 是什么意思
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what does anon-rss and total-vm mean
提问by UW20989
Recently, tomcat process on my Linux machine was killed abruptly. After investigation I found below error message in /var/log/messages file:
最近，我的 Linux 机器上的 tomcat 进程突然被杀死了。经过调查，我在 /var/log/messages 文件中发现以下错误消息：
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
Now, can someone please tell me that what all is included in total-vmand how is anon-rssdifferent from rss?
现在，有人可以告诉我所有都包含在其中total-vm以及与它们有何anon-rss不同rss吗？
回答by Breno Leit?o
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".
据我了解，进程使用的虚拟内存的大小被列为“total-vm”。它的一部分真正映射到 RAM 本身（已分配和使用）。这是“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").
RSS 的一部分分配在实内存块中（而不是映射到文件或设备中）。这是匿名内存（“anon-rss”），还有映射到设备和文件中的 RSS 内存块（“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.
所以，如果你在 vim 中打开一个大文件，file-rss 会很高，另一方面，如果你 malloc() 大量内存并真正使用它，你的 anon-rss 也会很高。
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.
另一方面，如果您分配了大量空间（使用 malloc()），但从不使用它，则总 vm 会更高，但不会使用实际内存（由于内存过量使用），因此， rss 值会很低。
