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

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Message-Id: <20130904141000.0F910EFA@pobox.sk>
Date:	Wed, 04 Sep 2013 14:10:00 +0200
From:	"azurIt" <azurit@...ox.sk>
To:	Michal Hocko <mhocko@...e.cz>
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

>[...]
>> 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.
>-- 
>Michal Hocko
>SUSE Labs
>



Yes, my script is freezing the cgroup before killing processes inside it. Stacks are taken after the freeze, it that problem?

azur
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