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Subject2.6.38-rc7, OOM behaviour?
From
Hi,

(please cc as not subscribed)

Ubuntu 10.10, 2.6.37-rc8, Core2Duo laptop, 6GB DDR2, Intel 160GB SSD.

I wanted to see what happens when I exhaust the memory of my system.
It's got 6GB ram and I created a 1GB swap with
http://code.google.com/p/compcache/ . To use more memory I launched
google-chrome processes, each with 25 tabs containing various sites
etc. When I reached 11 Google Chrome windows each with 25 tabs I maxed
out the memory, and things became real slow (sluggish mouse pointer,
system generally not responding) and the "HDD" activity light was
pretty constant.

I don't have any on disk swap.

I couldn't recovery the system at this point (it had stopped
responding, no HDD indicator, no mouse pointer movement), so I had to
reboot it using SysRq+b. This is what I saw in the kernel log after
reboot:

[snip]
Mar 2 18:34:26 hostname kernel: [22039.152074] [18915] 1000 18915
90784 7427 0 7 411 chrome
Mar 2 18:34:26 hostname kernel: [22039.152077] [19766] 1000 19766
63357 1196 0 0 0 gnome-terminal
Mar 2 18:34:26 hostname kernel: [22039.152081] [19777] 1000 19777
3634 41 0 0 0 gnome-pty-helpe
Mar 2 18:34:26 hostname kernel: [22039.152084] [19778] 1000 19778
5825 793 0 0 0 bash
Mar 2 18:34:26 hostname kernel: [22039.152087] [19840] 1000 19840
2871 131 0 0 0 watch
Mar 2 18:34:26 hostname kernel: [22039.152090] [20136] 1000 20136
93107 3997 0 10 588 chrome
Mar 2 18:34:26 hostname kernel: [22039.152093] Out of memory: Kill
process 20136 (chrome) score 590 or sacrifice child
Mar 2 18:34:26 hostname kernel: [22039.152097] Killed process 20136
(chrome) total-vm:372428kB, anon-rss:15556kB, file-rss:432kB
Mar 2 18:34:32 hostname kernel: [22042.872291] chrome invoked
oom-killer: gfp_mask=0x84d0, order=0, oom_adj=0, oom_score_adj=0
Mar 2 18:34:36 hostname kernel: [22042.872295] chrome cpuset=/ mems_allowed=0
Mar 2 18:34:38 hostname kernel: [22042.872298] Pid: 16321, comm:
chrome Tainted: P 2.6.38-rc7 #1
Mar 2 18:34:38 hostname kernel: [22042.872300] Call Trace:
Mar 2 18:34:38 hostname kernel: [22042.872308] [<ffffffff810b2ca2>]
? dump_header+0xa2/0x230
Mar 2 18:34:38 hostname kernel: [22042.872312] [<ffffffff81205f79>]
? apparmor_capable+0x29/0xa0
Mar 2 18:34:38 hostname kernel: [22042.872317] [<ffffffff811d40b6>]
? security_real_capable_noaudit+0x36/0x70
Mar 2 18:34:38 hostname kernel: [22042.872320] [<ffffffff810b31ce>]
? oom_kill_process+0x9e/0x290
Mar 2 18:34:38 hostname kernel: [22042.872323] [<ffffffff810b3678>]
? out_of_memory+0x2b8/0x3d0
Mar 2 18:34:38 hostname kernel: [22042.872325] [<ffffffff810b8028>]
? __alloc_pages_nodemask+0x848/0x860
Mar 2 18:34:38 hostname kernel: [22042.872330] [<ffffffff810e7e64>]
? alloc_pages_current+0x94/0x110
Mar 2 18:34:38 hostname kernel: [22042.872333] [<ffffffff8102ad9e>]
? pte_alloc_one+0xe/0x30
Mar 2 18:34:38 hostname kernel: [22042.872336] [<ffffffff810cb2f6>]
? __pte_alloc+0x26/0xd0
Mar 2 18:34:38 hostname kernel: [22042.872339] [<ffffffff810cec0e>]
? handle_mm_fault+0xee/0x1e0
Mar 2 18:34:38 hostname kernel: [22042.872342] [<ffffffff814b5227>]
? do_page_fault+0x1a7/0x4b0
Mar 2 18:34:38 hostname kernel: [22042.872346] [<ffffffff81138f21>]
? sys_epoll_wait+0xb1/0x420
Mar 2 18:34:38 hostname kernel: [22042.872350] [<ffffffff8103a970>]
? default_wake_function+0x0/0x20
Mar 2 18:34:38 hostname kernel: [22042.872354] [<ffffffff814b2a0f>]
? page_fault+0x1f/0x30
Mar 2 18:34:38 hostname kernel: [22042.872356] Mem-Info:
Mar 2 18:34:38 hostname kernel: [22042.872357] Node 0 DMA per-cpu:
Mar 2 18:34:38 hostname kernel: [22042.872359] CPU 0: hi: 0,
btch: 1 usd: 0
Mar 2 18:34:38 hostname kernel: [22042.872361] CPU 1: hi: 0,
btch: 1 usd: 0
Mar 2 18:34:38 hostname kernel: [22042.872362] Node 0 DMA32 per-cpu:
Mar 2 18:34:38 hostname kernel: [22042.872365] CPU 0: hi: 186,
btch: 31 usd: 30
Mar 2 18:34:38 hostname kernel: [22042.872366] CPU 1: hi: 186,
btch: 31 usd: 0
Mar 2 18:34:38 hostname kernel: [22042.872367] Node 0 Normal per-cpu:
Mar 2 18:34:38 hostname kernel: [22042.872369] CPU 0: hi: 186,
btch: 31 usd: 63
Mar 2 18:34:38 hostname kernel: [22042.872371] CPU 1: hi: 186,
btch: 31 usd: 0
Mar 2 18:34:38 hostname kernel: [22042.872375] active_anon:1116980
inactive_anon:242817 isolated_anon:0
Mar 2 18:34:38 hostname kernel: [22042.872376] active_file:507
inactive_file:689 isolated_file:11
Mar 2 18:34:38 hostname kernel: [22042.872377] unevictable:30
dirty:0 writeback:17 unstable:0
Mar 2 18:34:38 hostname kernel: [22042.872377] free:8848
slab_reclaimable:3286 slab_unreclaimable:8905
Mar 2 18:34:38 hostname kernel: [22042.872378] mapped:8639
shmem:6657 pagetables:15118 bounce:0
Mar 2 18:34:38 hostname kernel: [22042.872380] Node 0 DMA
free:15452kB min:24kB low:28kB high:36kB active_anon:0kB
inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB
isolated(anon):0kB isolated(file):0kB present:15684kB mlocked:0kB
dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB
slab_unreclaimable:424kB kernel_stack:0kB pagetables:0kB unstable:0kB
bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Mar 2 18:34:38 hostname kernel: [22042.872388] lowmem_reserve[]: 0
3510 6035 6035
Mar 2 18:34:38 hostname kernel: [22042.872391] Node 0 DMA32
free:15856kB min:5776kB low:7220kB high:8664kB active_anon:2916400kB
inactive_anon:583368kB active_file:792kB inactive_file:1192kB
unevictable:0kB isolated(anon):0kB isolated(file):44kB
present:3594900kB mlocked:0kB dirty:0kB writeback:24kB mapped:14068kB
shmem:14344kB slab_reclaimable:1576kB slab_unreclaimable:9256kB
kernel_stack:1112kB pagetables:26496kB unstable:0kB bounce:0kB
writeback_tmp:0kB pages_scanned:507 all_unreclaimable? no
Mar 2 18:34:38 hostname kernel: [22042.872399] lowmem_reserve[]: 0 0 2524 2524
Mar 2 18:34:38 hostname kernel: [22042.872402] Node 0 Normal
free:4084kB min:4152kB low:5188kB high:6228kB active_anon:1551520kB
inactive_anon:387900kB active_file:1236kB inactive_file:1564kB
unevictable:120kB isolated(anon):0kB isolated(file):0kB
present:2585592kB mlocked:112kB dirty:0kB writeback:44kB
mapped:20488kB shmem:12284kB slab_reclaimable:11568kB
slab_unreclaimable:25940kB kernel_stack:2864kB pagetables:33976kB
unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:400
all_unreclaimable? no
Mar 2 18:34:38 hostname kernel: [22042.872411] lowmem_reserve[]: 0 0 0 0
Mar 2 18:34:38 hostname kernel: [22042.872414] Node 0 DMA: 1*4kB
1*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB
3*4096kB = 15452kB
Mar 2 18:34:38 hostname kernel: [22042.872421] Node 0 DMA32: 126*4kB
103*8kB 78*16kB 29*32kB 11*64kB 9*128kB 9*256kB 4*512kB 2*1024kB
0*2048kB 1*4096kB = 15856kB
Mar 2 18:34:38 hostname kernel: [22042.872429] Node 0 Normal: 533*4kB
14*8kB 3*16kB 1*32kB 1*64kB 2*128kB 0*256kB 1*512kB 1*1024kB 0*2048kB
0*4096kB = 4180kB
Mar 2 18:34:38 hostname kernel: [22042.872436] 60090 total pagecache pages
Mar 2 18:34:38 hostname kernel: [22042.872437] 52166 pages in swap cache
Mar 2 18:34:38 hostname kernel: [22042.872439] Swap cache stats: add
753370, delete 701204, find 73773/125774
Mar 2 18:34:38 hostname kernel: [22042.872441] Free swap = 0kB
Mar 2 18:34:38 hostname kernel: [22042.872442] Total swap = 1048572kB
Mar 2 18:34:38 hostname kernel: [22042.898366] 1572848 pages RAM
Mar 2 18:34:38 hostname kernel: [22042.898368] 41030 pages reserved
Mar 2 18:34:38 hostname kernel: [22042.898369] 36046 pages shared
Mar 2 18:34:38 hostname kernel: [22042.898370] 1512687 pages non-shared
Mar 2 18:34:38 hostname kernel: [22042.898372] [ pid ] uid tgid
total_vm rss cpu oom_adj oom_score_adj name
Mar 2 18:34:38 hostname kernel: [22042.898382] [ 289] 0 289
4241 39 1 0 0 upstart-udev-br
Mar 2 18:34:38 hostname kernel: [22042.898386] [ 297] 0 297
4304 36 1 -17 -1000 udevd
Mar 2 18:34:38 hostname kernel: [22042.898391] [ 533] 0 533
2963 40 0 0 0 lt-ntfs
[snip]
Is this normal?

Regards,
// Mathias


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