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

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Message-Id: <20121210022038.E6570D37@pobox.sk>
Date:	Mon, 10 Dec 2012 02:20:38 +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

>There are no other callers AFAICS so I am getting clueless. Maybe more
>debugging will tell us something (the inlining has been reduced for thp
>paths which can reduce performance in thp page fault heavy workloads but
>this will give us better traces - I hope).


Michal,

this was printing so many debug messages to console that the whole server hangs and i had to hard reset it after several minutes :( Sorry but i cannot test such a things in production. There's no problem with one soft reset which takes 4 minutes but this hard reset creates about 20 minutes outage (mainly cos of disk quotas checking). Last logged message:

Dec 10 02:03:29 server01 kernel: [  220.366486] grsec: From 141.105.120.152: bruteforce prevention initiated for the next 30 minutes or until service restarted, stalling each fork 30 seconds.  Please investigate the crash report for /usr/lib/apache2/mpm-itk/apache2[apache2:3586] uid/euid:1258/1258 gid/egid:100/100, parent /usr/lib/apache2/mpm-itk/apache2[apache2:2142] uid/euid:0/0 gid/egid:0/0
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