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SubjectRe: [-mm patch] Show memcg information during OOM (v3)
On Wed, 4 Feb 2009 12:12:49 +0530
Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> [2009-02-04 14:24:55]:
>
> > On Wed, 4 Feb 2009 09:07:50 +0530
> > Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> >
> > > > > +}
> > > > > +
> > > > > #endif /* CONFIG_CGROUP_MEM_CONT */
> > > > >
> > > >
> > > > > +void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
> > > > > +{
> > > > > + struct cgroup *task_cgrp;
> > > > > + struct cgroup *mem_cgrp;
> > > > > + /*
> > > > > + * Need a buffer on stack, can't rely on allocations. The code relies
> > > >
> > > > I think it's in .bss section, but not on stack, and it's better to explain why
> > > > the static buffer is safe in the comment.
> > > >
> > >
> > > Yes, it is no longer on stack, in the original patch it was. I'll send
> > > an updated patch
> > >
> > In the newest mmotm, OOM kill message is following.
> > ==
> > Feb 4 13:16:28 localhost kernel: [ 249.338911] malloc2 invoked oom-killer: gfp_mask=0xd0, order=0, oomkilladj=0
> > Feb 4 13:16:28 localhost kernel: [ 249.339018] malloc2 cpuset=/ mems_allowed=0
> > Feb 4 13:16:28 localhost kernel: [ 249.339023] Pid: 3459, comm: malloc2 Not tainted 2.6.29-rc3-mm1 #1
> > Feb 4 13:16:28 localhost kernel: [ 249.339185] Call Trace:
> > Feb 4 13:16:28 localhost kernel: [ 249.339202] [<ffffffff8148dda6>] ? _spin_unlock+0x26/0x2a
> > Feb 4 13:16:28 localhost kernel: [ 249.339210] [<ffffffff8108d48d>] oom_kill_process+0x99/0x272
> > Feb 4 13:16:28 localhost kernel: [ 249.339214] [<ffffffff8108d918>] ? select_bad_process+0x9d/0xfa
> > Feb 4 13:16:28 localhost kernel: [ 249.339219] [<ffffffff8108dc8f>] mem_cgroup_out_of_memory+0x65/0x82
> > Feb 4 13:16:28 localhost kernel: [ 249.339224] [<ffffffff810bd457>] __mem_cgroup_try_charge+0x14c/0x196
> > Feb 4 13:16:28 localhost kernel: [ 249.339229] [<ffffffff810bdffa>] mem_cgroup_charge_common+0x47/0x72
> > Feb 4 13:16:28 localhost kernel: [ 249.339234] [<ffffffff810be063>] mem_cgroup_newpage_charge+0x3e/0x4f
> > Feb 4 13:16:28 localhost kernel: [ 249.339239] [<ffffffff810a05f9>] handle_mm_fault+0x214/0x761
> > Feb 4 13:16:28 localhost kernel: [ 249.339244] [<ffffffff8149062d>] do_page_fault+0x248/0x25f
> > Feb 4 13:16:28 localhost kernel: [ 249.339249] [<ffffffff8148e64f>] page_fault+0x1f/0x30
> > Feb 4 13:16:28 localhost kernel: [ 249.339260] Task in /group_A/01 killed as a result of limit of /group_A
> > Feb 4 13:16:28 localhost kernel: [ 249.339264] memory: usage 39168kB, limit 40960kB, failcnt 1
> > Feb 4 13:16:28 localhost kernel: [ 249.339266] memory+swap: usage 40960kB, limit 40960kB, failcnt 15
> > ==
> > Task in /group_A/01 is killed by mem+swap limit of /group_A.
> >
> > Yeah, very nice look :) thank you.
> >
>
> Welcome! Thanks for the good suggestion earlier.
>
> > BTW, I wonder can't we show the path of mount point ?
> > /group_A/01 is /cgroup/group_A/01 and /group_A/ is /cgroup/group_A/ on this system.
> > Very difficult ?
> >
>
> No, it is not very difficult, we just need to append the mount point.
> The reason for not doing it is consistency with output of
> /proc/<pid>/cgroup and other places where cgroup_path prints the path
> relative to the mount point. Since we are talking about memory, the
> administrator should know where it is mounted. Do you strongly feel
> the need to add mount point? My concern is consistency with other
> cgroup output (look at /proc/sched_debug) for example.
>
No. just curious :)

Thanks a lot. Consistency is more important.

-Kame



> --
> Balbir
>
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