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Message-ID: <20130125163130.GF4721@dhcp22.suse.cz> Date: Fri, 25 Jan 2013 17:31:30 +0100 From: Michal Hocko <mhocko@...e.cz> To: azurIt <azurit@...ox.sk> Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, cgroups mailinglist <cgroups@...r.kernel.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Johannes Weiner <hannes@...xchg.org> Subject: Re: [PATCH for 3.2.34] memcg: do not trigger OOM from add_to_page_cache_locked On Fri 25-01-13 16:07:23, azurIt wrote: > Any news? Thnx! Sorry, but I didn't get to this one yet. > > azur > > > > ______________________________________________________________ > > Od: "Michal Hocko" <mhocko@...e.cz> > > Komu: azurIt <azurit@...ox.sk> > > Dátum: 30.12.2012 12:08 > > Predmet: Re: [PATCH for 3.2.34] memcg: do not trigger OOM from add_to_page_cache_locked > > > > CC: linux-kernel@...r.kernel.org, linux-mm@...ck.org, "cgroups mailinglist" <cgroups@...r.kernel.org>, "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>, "Johannes Weiner" <hannes@...xchg.org> > >On Sun 30-12-12 02:09:47, azurIt wrote: > >> >which suggests that the patch is incomplete and that I am blind :/ > >> >mem_cgroup_cache_charge calls __mem_cgroup_try_charge for the page cache > >> >and that one doesn't check GFP_MEMCG_NO_OOM. So you need the following > >> >follow-up patch on top of the one you already have (which should catch > >> >all the remaining cases). > >> >Sorry about that... > >> > >> > >> This was, again, killing my MySQL server (search for "(mysqld)"): > >> http://www.watchdog.sk/lkml/oom_mysqld5 > > > >grep "Kill process" oom_mysqld5 > >Dec 30 01:53:34 server01 kernel: [ 367.061801] Memory cgroup out of memory: Kill process 5512 (apache2) score 716 or sacrifice child > >Dec 30 01:53:35 server01 kernel: [ 367.338024] Memory cgroup out of memory: Kill process 5517 (apache2) score 718 or sacrifice child > >Dec 30 01:53:35 server01 kernel: [ 367.747888] Memory cgroup out of memory: Kill process 5513 (apache2) score 721 or sacrifice child > >Dec 30 01:53:36 server01 kernel: [ 368.159860] Memory cgroup out of memory: Kill process 5516 (apache2) score 726 or sacrifice child > >Dec 30 01:53:36 server01 kernel: [ 368.665606] Memory cgroup out of memory: Kill process 5520 (apache2) score 733 or sacrifice child > >Dec 30 01:53:36 server01 kernel: [ 368.765652] Out of memory: Kill process 1778 (mysqld) score 39 or sacrifice child > >Dec 30 01:53:36 server01 kernel: [ 369.101753] Memory cgroup out of memory: Kill process 5519 (apache2) score 754 or sacrifice child > >Dec 30 01:53:37 server01 kernel: [ 369.464262] Memory cgroup out of memory: Kill process 5583 (apache2) score 762 or sacrifice child > >Dec 30 01:53:37 server01 kernel: [ 369.465017] Out of memory: Kill process 5506 (apache2) score 18 or sacrifice child > >Dec 30 01:53:37 server01 kernel: [ 369.574932] Memory cgroup out of memory: Kill process 5523 (apache2) score 759 or sacrifice child > > > >So your mysqld has been killed by the global OOM not memcg. But why when > >you seem to be perfectly fine regarding memory? I guess the following > >backtrace is relevant: > >Dec 30 01:53:36 server01 kernel: [ 368.569720] DMA: 0*4kB 1*8kB 0*16kB 1*32kB 2*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15912kB > >Dec 30 01:53:36 server01 kernel: [ 368.570447] DMA32: 9*4kB 10*8kB 8*16kB 6*32kB 5*64kB 6*128kB 4*256kB 2*512kB 3*1024kB 3*2048kB 613*4096kB = 2523636kB > >Dec 30 01:53:36 server01 kernel: [ 368.571175] Normal: 5*4kB 2060*8kB 4122*16kB 2550*32kB 2667*64kB 722*128kB 197*256kB 68*512kB 15*1024kB 4*2048kB 1855*4096kB = 8134036kB > >Dec 30 01:53:36 server01 kernel: [ 368.571906] 308964 total pagecache pages > >Dec 30 01:53:36 server01 kernel: [ 368.572023] 0 pages in swap cache > >Dec 30 01:53:36 server01 kernel: [ 368.572140] Swap cache stats: add 0, delete 0, find 0/0 > >Dec 30 01:53:36 server01 kernel: [ 368.572260] Free swap = 0kB > >Dec 30 01:53:36 server01 kernel: [ 368.572375] Total swap = 0kB > >Dec 30 01:53:36 server01 kernel: [ 368.597836] apache2 invoked oom-killer: gfp_mask=0x0, order=0, oom_adj=0, oom_score_adj=0 > >Dec 30 01:53:36 server01 kernel: [ 368.598034] apache2 cpuset=uid mems_allowed=0 > >Dec 30 01:53:36 server01 kernel: [ 368.598152] Pid: 5385, comm: apache2 Not tainted 3.2.35-grsec #1 > >Dec 30 01:53:36 server01 kernel: [ 368.598273] Call Trace: > >Dec 30 01:53:36 server01 kernel: [ 368.598396] [<ffffffff810cc89e>] dump_header+0x7e/0x1e0 > >Dec 30 01:53:36 server01 kernel: [ 368.598516] [<ffffffff810cc79f>] ? find_lock_task_mm+0x2f/0x70 > >Dec 30 01:53:36 server01 kernel: [ 368.598638] [<ffffffff810ccd65>] oom_kill_process+0x85/0x2a0 > >Dec 30 01:53:36 server01 kernel: [ 368.598759] [<ffffffff810cd415>] out_of_memory+0xe5/0x200 > >Dec 30 01:53:36 server01 kernel: [ 368.598880] [<ffffffff810cd5ed>] pagefault_out_of_memory+0xbd/0x110 > >Dec 30 01:53:36 server01 kernel: [ 368.599006] [<ffffffff81026e96>] mm_fault_error+0xb6/0x1a0 > >Dec 30 01:53:36 server01 kernel: [ 368.599127] [<ffffffff8102736e>] do_page_fault+0x3ee/0x460 > >Dec 30 01:53:36 server01 kernel: [ 368.599250] [<ffffffff81131ccf>] ? mntput+0x1f/0x30 > >Dec 30 01:53:36 server01 kernel: [ 368.599371] [<ffffffff811134e6>] ? fput+0x156/0x200 > >Dec 30 01:53:36 server01 kernel: [ 368.599496] [<ffffffff815b567f>] page_fault+0x1f/0x30 > > > >This would suggest that an unexpected ENOMEM leaked during page fault > >path. I do not see which one could that be because you said THP > >(CONFIG_TRANSPARENT_HUGEPAGE) are disabled (and the other patch I have > >mentioned in the thread should fix that issue - btw. the patch is > >already scheduled for stable tree). > > __do_fault, do_anonymous_page and do_wp_page call > >mem_cgroup_newpage_charge with GFP_KERNEL which means that > >we do memcg OOM and never return ENOMEM. do_swap_page calls > >mem_cgroup_try_charge_swapin with GFP_KERNEL as well. > > > >I might have missed something but I will not get to look closer before > >2nd January. > >-- > >Michal Hocko > >SUSE Labs > > > -- > To unsubscribe from this list: send the line "unsubscribe cgroups" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Michal Hocko SUSE Labs -- 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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