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确定被OOM-killer杀掉进程的VM大小

linuxlinux-kerneloperating-systemcentos5
3
有没有办法在Linux oom-killer杀死进程时确定该进程的虚拟内存大小。
我找不到任何文件/var/log/messages中的参数，可以告诉我被杀死的进程的总VM大小。虽然/var/log/messages中有许多其他信息，但没有进程的总VM大小。
这是一个Centos 5.7 x64机器。
以下是/var/log/messages的内容：
Mar  1 18:51:45 c42 kernel: NameService invoked oom-killer: gfp_mask=0x201d2, order=0, oomkilladj=0
Mar  1 18:51:45 c42 kernel: 
Mar  1 18:51:46 c42 kernel: Call Trace:
Mar  1 18:51:46 c42 kernel:  [<ffffffff800c9d3a>] out_of_memory+0x8e/0x2f3
Mar  1 18:51:46 c42 kernel:  [<ffffffff8002dfd7>] __wake_up+0x38/0x4f
Mar  1 18:51:46 c42 kernel:  [<ffffffff8000f677>] __alloc_pages+0x27f/0x308
Mar  1 18:51:46 c42 kernel:  [<ffffffff80013034>] __do_page_cache_readahead+0x96/0x17b
Mar  1 18:51:46 c42 kernel:  [<ffffffff80013971>] filemap_nopage+0x14c/0x360
Mar  1 18:51:46 c42 kernel:  [<ffffffff8000896c>] __handle_mm_fault+0x1fd/0x103b
Mar  1 18:51:46 c42 kernel:  [<ffffffff800671f2>] do_page_fault+0x499/0x842
Mar  1 18:51:46 c42 kernel:  [<ffffffff80031143>] do_fork+0x148/0x1c1
Mar  1 18:51:46 c42 kernel:  [<ffffffff8005dde9>] error_exit+0x0/0x84
Mar  1 18:51:46 c42 kernel: 
Mar  1 18:51:46 c42 kernel: Mem-info:
Mar  1 18:51:47 c42 kernel: Node 0 DMA per-cpu:
Mar  1 18:51:48 c42 kernel: cpu 0 hot: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 0 cold: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 1 hot: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 1 cold: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 2 hot: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 2 cold: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 3 hot: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 3 cold: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 4 hot: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 4 cold: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 5 hot: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 5 cold: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 6 hot: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 6 cold: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 7 hot: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 7 cold: high 0, batch 1 used:0
Mar  1 18:51:48 c42 kernel: cpu 8 hot: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 8 cold: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 9 hot: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 9 cold: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 10 hot: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 10 cold: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 11 hot: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 11 cold: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 12 hot: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 12 cold: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 13 hot: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 13 cold: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 14 hot: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 14 cold: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 15 hot: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: cpu 15 cold: high 0, batch 1 used:0
Mar  1 18:51:49 c42 kernel: Node 0 DMA32 per-cpu:
Mar  1 18:51:49 c42 kernel: cpu 0 hot: high 186, batch 31 used:31
Mar  1 18:51:49 c42 kernel: cpu 0 cold: high 62, batch 15 used:35

............

Mar  1 18:51:58 c42 kernel: cpu 14 cold: high 62, batch 15 used:18
Mar  1 18:51:58 c42 kernel: cpu 15 hot: high 186, batch 31 used:6
Mar  1 18:51:59 c42 kernel: cpu 15 cold: high 62, batch 15 used:14
Mar  1 18:51:59 c42 kernel: Node 1 HighMem per-cpu: empty
Mar  1 18:51:59 c42 kernel: Free pages:       50396kB (0kB HighMem)
Mar  1 18:51:59 c42 kernel: Active:1559270 inactive:2490421 dirty:0 writeback:0 unstable:0 free:12599 slab:8740 mapped-file:1186 mapped-anon:4051463 pagetables:16277
Mar  1 18:51:59 c42 kernel: Node 0 DMA free:10068kB min:8kB low:8kB high:12kB active:0kB inactive:0kB present:9660kB pages_scanned:0 all_unreclaimable? yes
Mar  1 18:51:59 c42 kernel: lowmem_reserve[]: 0 1965 8025 8025
Mar  1 18:51:59 c42 kernel: Node 0 DMA32 free:26176kB min:1980kB low:2472kB high:2968kB active:1020328kB inactive:922224kB present:2012496kB pages_scanned:4075359 all_unreclaimable? yes
Mar  1 18:51:59 c42 kernel: lowmem_reserve[]: 0 0 6060 6060
Mar  1 18:51:59 c42 kernel: Node 0 Normal free:6060kB min:6108kB low:7632kB high:9160kB active:490800kB inactive:5569172kB present:6205440kB pages_scanned:21679912 all_unreclaimable? yes
Mar  1 18:51:59 c42 kernel: lowmem_reserve[]: 0 0 0 0
Mar  1 18:51:59 c42 kernel: Node 0 HighMem free:0kB min:128kB low:128kB high:128kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Mar  1 18:52:00 c42 kernel: lowmem_reserve[]: 0 0 0 0
Mar  1 18:52:00 c42 kernel: Node 1 DMA free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Mar  1 18:52:00 c42 kernel: lowmem_reserve[]: 0 0 8080 8080
Mar  1 18:52:00 c42 kernel: Node 1 DMA32 free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Mar  1 18:52:00 c42 kernel: lowmem_reserve[]: 0 0 8080 8080
Mar  1 18:52:00 c42 kernel: Node 1 Normal free:8092kB min:8144kB low:10180kB high:12216kB active:4725952kB inactive:3470288kB present:8273920kB pages_scanned:15611005 all_unreclaimable? yes
Mar  1 18:52:00 c42 kernel: lowmem_reserve[]: 0 0 0 0
Mar  1 18:52:00 c42 kernel: Node 1 HighMem free:0kB min:128kB low:128kB high:128kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Mar  1 18:52:01 c42 kernel: lowmem_reserve[]: 0 0 0 0
Mar  1 18:52:02 c42 kernel: Node 0 DMA: 5*4kB 2*8kB 5*16kB 5*32kB 5*64kB 2*128kB 0*256kB 0*512kB 1*1024kB 0*2048kB 2*4096kB = 10068kB
Mar  1 18:52:02 c42 kernel: Node 0 DMA32: 30*4kB 1*8kB 0*16kB 0*32kB 1*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 0*2048kB 6*4096kB = 26176kB
Mar  1 18:52:02 c42 kernel: Node 0 Normal: 9*4kB 7*8kB 3*16kB 1*32kB 0*64kB 0*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB 1*4096kB = 6060kB
Mar  1 18:52:02 c42 kernel: Node 0 HighMem: empty
Mar  1 18:52:03 c42 kernel: Node 1 DMA: empty
Mar  1 18:52:03 c42 kernel: Node 1 DMA32: empty
Mar  1 18:52:03 c42 kernel: Node 1 Normal: 49*4kB 3*8kB 0*16kB 0*32kB 1*64kB 1*128kB 0*256kB 1*512kB 1*1024kB 1*2048kB 1*4096kB = 8092kB
Mar  1 18:52:03 c42 kernel: Node 1 HighMem: empty
Mar  1 18:52:03 c42 kernel: 1624 pagecache pages
Mar  1 18:52:04 c42 kernel: Swap cache: add 2581210, delete 2580953, find 6957/9192, race 0+16
Mar  1 18:52:04 c42 kernel: Free swap  = 0kB
Mar  1 18:52:04 c42 kernel: Total swap = 10241428kB
Mar  1 18:52:04 c42 kernel: Free swap:            0kB
Mar  1 18:52:06 c42 kernel: 4718592 pages of RAM
Mar  1 18:52:06 c42 kernel: 616057 reserved pages
Mar  1 18:52:07 c42 kernel: 17381 pages shared
Mar  1 18:52:08 c42 kernel: 260 pages swap cached
Mar  1 18:52:09 c42 kernel: Out of memory: Killed process 16727, UID 501, (ApplicationMoni).
这篇文章可能与之相关。 - Sam Protsenko
@SamProtsenko 上面的链接没有提到虚拟机的大小。 - Arpit Aggarwal
@ArpitAggarwal，您的意思是，这个进程被杀死时所占用的内存是多少，对吗？ - Ravipati Praveen
我指的是进程被 OOM killer 杀死时的虚拟内存总大小。我的进程被 OOM killer 杀死了，我想看看它的总虚拟内存大小以及程序的总住址内存使用情况。 - Arpit Aggarwal
根据Linux，总虚拟内存是物理内存加虚拟内存，即RAM+SWAP。 - Ravipati Praveen
2个回答
3
根据Linux的说法，总内存是物理内存和虚拟内存的总和，即RAM+SWAP。
当您的进程被杀死时，您将在内核日志中获得被杀死的进程的分数。
通过观察top命令和进程的oom_score，我发现： oom_score <= 总内存使用百分比 例如：我的系统有16GB的RAM和1GB的SWAP，所以总内存为17GB。Tomcat进程的oom分数为“602”，那么tomcat的使用量大于或等于总内存的60.2％，即tomcat占用了10.23+ GB的RAM。
以下是另一个示例： enter image description here enter image description here 得分是249，即内存使用量为24.9％。
3
但是OOM Killer在杀死进程时不会打印出该进程的oom_score。我该如何知道呢？ - Arpit Aggarwal
2
在导致崩溃的堆栈跟踪之后（通常是内存分配请求），这将在dmesg中报告。
有没有一种方法可以随意获取dmesg记录的输出？（以监视内容）？ - Rob Audenaerde
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