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Date: Wed, 2 Mar 2011 19:33:06 +0000 From: Mathias Burén <mathias.buren@...il.com> To: linux-kernel@...r.kernel.org Subject: 2.6.38-rc7, OOM behaviour? 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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