linux-kernel - Re: [patch 0/7] improve memcg oom killer robustness v2

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Date:	Wed, 4 Sep 2013 14:26:32 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	azurIt <azurit@...ox.sk>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, cgroups@...r.kernel.org, x86@...nel.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 0/7] improve memcg oom killer robustness v2

On Wed 04-09-13 14:10:00, azurIt wrote:
> >[...]
> >> My script has just detected (and killed) another freezed cgroup. I
> >> must say that i'm not 100% sure that cgroup was really freezed but it
> >> has 99% or more memory usage for at least 30 seconds (well, or it has
> >> 99% memory usage in both two cases the script was checking it). Here
> >> are stacks of processes inside it before they were killed:
> >[...]
> >> pid: 26536
> >> stack:
> >> [<ffffffff81080a45>] refrigerator+0x95/0x160
> >> [<ffffffff8106ac2b>] get_signal_to_deliver+0x1cb/0x540
> >> [<ffffffff8100188b>] do_signal+0x6b/0x750
> >> [<ffffffff81001fc5>] do_notify_resume+0x55/0x80
> >> [<ffffffff815cb662>] retint_signal+0x3d/0x7b
> >> [<ffffffffffffffff>] 0xffffffffffffffff
> >
> >[...]
> >
> >This task is sitting in the refigerator which means it has been frozen
> >by the freezer cgroup most probably. I am not familiar with the
> >implementation but my recollection is that you have to thaw that group
> >in order the killed process can pass away.
> 
> Yes, my script is freezing the cgroup before killing processes inside
> it. Stacks are taken after the freeze, it that problem?

I thought you had a problem to remove this particular group...
-- 
Michal Hocko
SUSE Labs
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