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

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Date:	Mon, 16 Sep 2013 16:13:16 +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

> 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
>On Mon 16-09-13 16:01:19, azurIt wrote:
>> > 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
>> >On Sat 14-09-13 12:48:31, azurIt wrote:
>> >[...]
>> >> Here is the first occurence, this night between 5:15 and 5:25:
>> >>  - this time i kept opened terminal from other server to this problematic one with htop running
>> >>  - when server went down i opened it and saw one process of one user running at the top and taking 97% of CPU (cgroup 1304)
>> >
>> >I guess you do not have a stack trace(s) for that process? That would be
>> >extremely helpful.
>> 
>> I'm afraid it won't be possible as server is completely not responding
>> when it happens. Anyway, i don't think it was a fault of one process
>> or one user.
>
>You can use sysrq+l via serial console to see tasks hogging the CPU or
>sysrq+t to see all the existing tasks.


Doesn't work here, it just prints 'l' resp. 't'.

azur
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