Linux oom-killer 로그 이해
내 앱이 oom-killer에 의해 죽었습니다. 스왑없이 라이브 USB에서 실행되는 Ubuntu 11.10이며 PC에는 1GB의 RAM이 있습니다. 실행중인 유일한 앱 (우분투에 내장 된 모든 것 제외)은 내 프로그램 flasherav입니다. / tmp는 메모리 매핑이며 충돌 당시 약 200MB의 파일이 포함되어 있습니다 (따라서 ~ 200MB의 RAM을 차지함).
나는 정확히 모든 메모리가 사용되는 곳을 이해할 수 있도록 om-killer 로그를 분석하는 방법을 이해하려고합니다. 에? 이를 이해하면 위반자의 사용량을 줄여 앱이 1GB의 램이있는 컴퓨터에서 실행되도록 할 수 있습니다. 내 구체적인 질문은 다음과 같습니다.
상황을 분석하기 위해 "total_vm"열을 요약했는데 609342KB (/ tmp의 200MB에 추가 할 때 여전히 809MB에 불과 함) 만 얻습니다. "total_vm"열이 무엇인지 잘못 알고있을 수 있습니다. 할당되었지만 사용되지 않은 메모리와 공유 메모리가 포함되어 있습니까? 그렇다면 실제로 사용 된 메모리를 과장하지 않아야합니다 (따라서 메모리가 부족하면 안됩니다). 아래 목록에 설명되지 않은 다른 메모리 덩어리가 사용 중입니까?
[11686.040460] flasherav invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0
[11686.040467] flasherav cpuset=/ mems_allowed=0
[11686.040472] Pid: 2859, comm: flasherav Not tainted 3.0.0-12-generic #20-Ubuntu
[11686.040476] Call Trace:
[11686.040488] [<c10e1c15>] dump_header.isra.7+0x85/0xc0
[11686.040493] [<c10e1e6c>] oom_kill_process+0x5c/0x80
[11686.040498] [<c10e225f>] out_of_memory+0xbf/0x1d0
[11686.040503] [<c10e6123>] __alloc_pages_nodemask+0x6c3/0x6e0
[11686.040509] [<c10e78d3>] ? __do_page_cache_readahead+0xe3/0x170
[11686.040514] [<c10e0fc8>] filemap_fault+0x218/0x390
[11686.040519] [<c1001c24>] ? __switch_to+0x94/0x1a0
[11686.040525] [<c10fb5ee>] __do_fault+0x3e/0x4b0
[11686.040530] [<c1069971>] ? enqueue_hrtimer+0x21/0x80
[11686.040535] [<c10fec2c>] handle_pte_fault+0xec/0x220
[11686.040540] [<c10fee68>] handle_mm_fault+0x108/0x210
[11686.040546] [<c152fa00>] ? vmalloc_fault+0xee/0xee
[11686.040551] [<c152fb5b>] do_page_fault+0x15b/0x4a0
[11686.040555] [<c1069a90>] ? update_rmtp+0x80/0x80
[11686.040560] [<c106a7b6>] ? hrtimer_start_range_ns+0x26/0x30
[11686.040565] [<c106aeaf>] ? sys_nanosleep+0x4f/0x60
[11686.040569] [<c152fa00>] ? vmalloc_fault+0xee/0xee
[11686.040574] [<c152cfcf>] error_code+0x67/0x6c
[11686.040580] [<c1520000>] ? reserve_backup_gdb.isra.11+0x26d/0x2c0
[11686.040583] Mem-Info:
[11686.040585] DMA per-cpu:
[11686.040588] CPU 0: hi: 0, btch: 1 usd: 0
[11686.040592] CPU 1: hi: 0, btch: 1 usd: 0
[11686.040594] Normal per-cpu:
[11686.040597] CPU 0: hi: 186, btch: 31 usd: 5
[11686.040600] CPU 1: hi: 186, btch: 31 usd: 30
[11686.040603] HighMem per-cpu:
[11686.040605] CPU 0: hi: 42, btch: 7 usd: 7
[11686.040608] CPU 1: hi: 42, btch: 7 usd: 22
[11686.040613] active_anon:113150 inactive_anon:113378 isolated_anon:0
[11686.040615] active_file:86 inactive_file:1964 isolated_file:0
[11686.040616] unevictable:0 dirty:0 writeback:0 unstable:0
[11686.040618] free:13274 slab_reclaimable:2239 slab_unreclaimable:2594
[11686.040619] mapped:1387 shmem:4380 pagetables:1375 bounce:0
[11686.040627] DMA free:4776kB min:784kB low:980kB high:1176kB active_anon:5116kB inactive_anon:5472kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15804kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:80kB slab_unreclaimable:168kB kernel_stack:96kB pagetables:64kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:6 all_unreclaimable? yes
[11686.040634] lowmem_reserve[]: 0 865 1000 1000
[11686.040644] Normal free:48212kB min:44012kB low:55012kB high:66016kB active_anon:383196kB inactive_anon:383704kB active_file:344kB inactive_file:7884kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:885944kB mlocked:0kB dirty:0kB writeback:0kB mapped:5548kB shmem:17520kB slab_reclaimable:8876kB slab_unreclaimable:10208kB kernel_stack:1960kB pagetables:3976kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:930 all_unreclaimable? yes
[11686.040652] lowmem_reserve[]: 0 0 1078 1078
[11686.040662] HighMem free:108kB min:132kB low:1844kB high:3560kB active_anon:64288kB inactive_anon:64336kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:138072kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:1460kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:61 all_unreclaimable? yes
[11686.040669] lowmem_reserve[]: 0 0 0 0
[11686.040675] DMA: 20*4kB 24*8kB 34*16kB 26*32kB 19*64kB 13*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 4784kB
[11686.040690] Normal: 819*4kB 607*8kB 357*16kB 176*32kB 99*64kB 49*128kB 23*256kB 4*512kB 0*1024kB 0*2048kB 2*4096kB = 48212kB
[11686.040704] HighMem: 16*4kB 0*8kB 1*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 80kB
[11686.040718] 14680 total pagecache pages
[11686.040721] 8202 pages in swap cache
[11686.040724] Swap cache stats: add 2191074, delete 2182872, find 1247325/1327415
[11686.040727] Free swap = 0kB
[11686.040729] Total swap = 524284kB
[11686.043240] 262100 pages RAM
[11686.043244] 34790 pages HighMem
[11686.043246] 5610 pages reserved
[11686.043248] 2335 pages shared
[11686.043250] 240875 pages non-shared
[11686.043253] [ pid ] uid tgid total_vm rss cpu oom_adj oom_score_adj name
[11686.043266] [ 1084] 0 1084 662 1 0 0 0 upstart-udev-br
[11686.043271] [ 1094] 0 1094 743 79 0 -17 -1000 udevd
[11686.043276] [ 1104] 101 1104 7232 42 0 0 0 rsyslogd
[11686.043281] [ 1149] 103 1149 1066 188 1 0 0 dbus-daemon
[11686.043286] [ 1165] 0 1165 1716 66 0 0 0 modem-manager
[11686.043291] [ 1220] 106 1220 861 42 0 0 0 avahi-daemon
[11686.043296] [ 1221] 106 1221 829 0 1 0 0 avahi-daemon
[11686.043301] [ 1255] 0 1255 6880 117 0 0 0 NetworkManager
[11686.043306] [ 1308] 0 1308 5988 144 0 0 0 polkitd
[11686.043311] [ 1334] 0 1334 723 85 0 -17 -1000 udevd
[11686.043316] [ 1335] 0 1335 730 108 0 -17 -1000 udevd
[11686.043320] [ 1375] 0 1375 663 37 0 0 0 upstart-socket-
[11686.043325] [ 1464] 0 1464 1333 120 1 0 0 login
[11686.043330] [ 1467] 0 1467 1333 135 1 0 0 login
[11686.043335] [ 1486] 0 1486 1333 135 1 0 0 login
[11686.043339] [ 1487] 0 1487 1333 136 1 0 0 login
[11686.043344] [ 1493] 0 1493 1333 134 1 0 0 login
[11686.043349] [ 1528] 0 1528 496 45 0 0 0 acpid
[11686.043354] [ 1529] 0 1529 607 46 1 0 0 cron
[11686.043359] [ 1549] 0 1549 10660 100 0 0 0 lightdm
[11686.043363] [ 1550] 0 1550 570 28 0 0 0 atd
[11686.043368] [ 1584] 0 1584 855 35 0 0 0 irqbalance
[11686.043373] [ 1703] 0 1703 17939 9653 0 0 0 Xorg
[11686.043378] [ 1874] 0 1874 7013 174 0 0 0 console-kit-dae
[11686.043382] [ 1958] 0 1958 1124 52 1 0 0 bluetoothd
[11686.043388] [ 2048] 999 2048 2435 641 1 0 0 bash
[11686.043392] [ 2049] 999 2049 2435 595 0 0 0 bash
[11686.043397] [ 2050] 999 2050 2435 587 1 0 0 bash
[11686.043402] [ 2051] 999 2051 2435 634 1 0 0 bash
[11686.043406] [ 2054] 999 2054 2435 569 0 0 0 bash
[11686.043411] [ 2155] 0 2155 1333 128 0 0 0 login
[11686.043416] [ 2222] 0 2222 684 67 1 0 0 dhclient
[11686.043420] [ 2240] 999 2240 2435 415 0 0 0 bash
[11686.043425] [ 2244] 0 2244 3631 58 0 0 0 accounts-daemon
[11686.043430] [ 2258] 999 2258 11683 277 0 0 0 gnome-session
[11686.043435] [ 2407] 999 2407 964 24 0 0 0 ssh-agent
[11686.043440] [ 2410] 999 2410 937 53 0 0 0 dbus-launch
[11686.043444] [ 2411] 999 2411 1319 300 1 0 0 dbus-daemon
[11686.043449] [ 2413] 999 2413 2287 88 0 0 0 gvfsd
[11686.043454] [ 2418] 999 2418 7867 123 1 0 0 gvfs-fuse-daemo
[11686.043459] [ 2427] 999 2427 32720 804 0 0 0 gnome-settings-
[11686.043463] [ 2437] 999 2437 10750 124 0 0 0 gnome-keyring-d
[11686.043468] [ 2442] 999 2442 2321 244 1 0 0 gconfd-2
[11686.043473] [ 2447] 0 2447 6490 156 0 0 0 upowerd
[11686.043478] [ 2467] 999 2467 7590 87 0 0 0 dconf-service
[11686.043482] [ 2529] 999 2529 11807 211 0 0 0 gsd-printer
[11686.043487] [ 2531] 999 2531 12162 587 0 0 0 metacity
[11686.043492] [ 2535] 999 2535 19175 960 0 0 0 unity-2d-panel
[11686.043496] [ 2536] 999 2536 19408 1012 0 0 0 unity-2d-launch
[11686.043502] [ 2539] 999 2539 16154 1120 1 0 0 nautilus
[11686.043506] [ 2540] 999 2540 17888 534 0 0 0 nm-applet
[11686.043511] [ 2541] 999 2541 7005 253 0 0 0 polkit-gnome-au
[11686.043516] [ 2544] 999 2544 8930 430 0 0 0 bamfdaemon
[11686.043521] [ 2545] 999 2545 11217 442 1 0 0 bluetooth-apple
[11686.043525] [ 2547] 999 2547 510 16 0 0 0 sh
[11686.043530] [ 2548] 999 2548 11205 301 1 0 0 gnome-fallback-
[11686.043535] [ 2565] 999 2565 6614 179 1 0 0 gvfs-gdu-volume
[11686.043539] [ 2567] 0 2567 5812 164 1 0 0 udisks-daemon
[11686.043544] [ 2571] 0 2571 1580 69 0 0 0 udisks-daemon
[11686.043549] [ 2579] 999 2579 16354 1035 0 0 0 unity-panel-ser
[11686.043554] [ 2602] 0 2602 1188 47 0 0 0 sudo
[11686.043559] [ 2603] 0 2603 374634 181503 0 0 0 flasherav
[11686.043564] [ 2607] 999 2607 12673 189 0 0 0 indicator-appli
[11686.043569] [ 2609] 999 2609 19313 311 1 0 0 indicator-datet
[11686.043573] [ 2611] 999 2611 15738 225 0 0 0 indicator-messa
[11686.043578] [ 2615] 999 2615 17433 237 1 0 0 indicator-sessi
[11686.043583] [ 2627] 999 2627 2393 132 0 0 0 gvfsd-trash
[11686.043588] [ 2640] 999 2640 1933 85 0 0 0 geoclue-master
[11686.043592] [ 2650] 0 2650 2498 1136 1 0 0 mount.ntfs
[11686.043598] [ 2657] 999 2657 6624 128 1 0 0 telepathy-indic
[11686.043602] [ 2659] 999 2659 2246 112 0 0 0 mission-control
[11686.043607] [ 2662] 999 2662 5431 346 1 0 0 gdu-notificatio
[11686.043612] [ 2664] 0 2664 3716 2392 0 0 0 mount.ntfs
[11686.043617] [ 2679] 999 2679 12453 197 1 0 0 zeitgeist-datah
[11686.043621] [ 2685] 999 2685 5196 1581 1 0 0 zeitgeist-daemo
[11686.043626] [ 2934] 999 2934 16305 710 0 0 0 gnome-terminal
[11686.043631] [ 2938] 999 2938 553 0 0 0 0 gnome-pty-helpe
[11686.043636] [ 2939] 999 2939 1814 406 0 0 0 bash
[11686.043641] Out of memory: Kill process 2603 (flasherav) score 761 or sacrifice child
[11686.043647] Killed process 2603 (flasherav) total-vm:1498536kB, anon-rss:721784kB, file-rss:4228kB
Linux의 메모리 관리는 이해하기가 약간 까다 롭고 아직 완전히 이해했다고 말할 수는 없지만 제 경험과 지식을 조금 공유하려고합니다.
질문에 대한 간단한 대답 : 예, 목록에있는 것 외에 다른 내용이 포함되어 있습니다.
What's being shown in your list is applications run in userspace. The kernel uses memory for itself and modules, on top of that it also has a lower limit of free memory that you can't go under. When you've reached that level it will try to free up resources, and when it can't do that anymore, you end up with an OOM problem.
From the last line of your list you can read that the kernel reports a total-vm usage of: 1498536kB (1,5GB), where the total-vm includes both your physical RAM and swap space. You stated you don't have any swap but the kernel seems to think otherwise since your swap space is reported to be full (Total swap = 524284kB, Free swap = 0kB) and it reports a total vmem size of 1,5GB.
Another thing that can complicate things further is memory fragmentation. You can hit the OOM killer when the kernel tries to allocate lets say 4096kB of continous memory, but there are no free ones availible.
Now that alone probably won't help you solve the actual problem. I don't know if it's normal for your program to require that amount of memory, but I would recommend to try a static code analyzer like cppcheck to check for memory leaks or file descriptor leaks. You could also try to run it through Valgrind to get a bit more information out about memory usage.
Sum of total_vm is 847170 and sum of rss is 214726, these two values are counted in 4kB pages, which means when oom-killer was running, you had used 214726*4kB=858904kB physical memory and swap space.
Since your physical memory is 1GB and ~200MB was used for memory mapping, it's reasonable for invoking oom-killer when 858904kB was used.
rss for process 2603 is 181503, which means 181503*4KB=726012 rss, was equal to sum of anon-rss and file-rss.
[11686.043647] Killed process 2603 (flasherav) total-vm:1498536kB, anon-rss:721784kB, file-rss:4228kB
This webpage have an explanation and a solution.
The solution is:
To fix this problem the behavior of the kernel has to be changed, so it will no longer overcommit the memory for application requests. Finally I have included those mentioned values into the /etc/sysctl.conf file, so they get automatically applied on start-up:
vm.overcommit_memory = 2
vm.overcommit_ratio = 80
참고URL : https://stackoverflow.com/questions/9199731/understanding-the-linux-oom-killers-logs
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