linux-kernel - Re: [PATCH for 3.2.34] memcg: do not trigger OOM from add_to_page_cache

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Date:	Fri, 30 Nov 2012 13:53:30 +0100
From:	"azurIt" <azurit@...ox.sk>
To:	Michal Hocko <mhocko@...e.cz>
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

>Anyway your system is under both global and local memory pressure. You
>didn't see apache going down previously because it was probably the one
>which was stuck and could be killed.
>Anyway you need to setup your system more carefully.


No, it wasn't, i'm 1000% sure (i was on SSH). Here is the memory usage graph from that system on that time:
http://www.watchdog.sk/lkml/memory.png

The blank part is rebooting into new kernel. MySQL server was killed several times, then i rebooted into previous kernel and problem was gone (not a single MySQL kill). You can see two MySQL kills there on 03:54 and 03:04:30.


>
>> Maybe i should mention that MySQL server has it's own cgroup (called
>> 'mysql') but with no limits to any resources.
>
>Where is that group in the hierarchy?



In root.
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