linux-kernel - Re: Misleading OOM messages

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Message-ID: <20090515203122.GM4451@balbir.in.ibm.com>
Date:	Sat, 16 May 2009 02:01:22 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Dave Hansen <dave@...ux.vnet.ibm.com>, Pavel Machek <pavel@....cz>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Nick Piggin <npiggin@...e.de>, Mel Gorman <mel@....ul.ie>,
	Peter Ziljstra <a.p.ziljstra@...llo.nl>,
	San Mehat <san@...roid.com>, Arve Hj?nnev?g <arve@...roid.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Misleading OOM messages

* Christoph Lameter <cl@...ux-foundation.org> [2009-05-15 15:26:43]:

> On Fri, 15 May 2009, Dave Hansen wrote:
> 
> > On Fri, 2009-05-15 at 13:57 -0400, Christoph Lameter wrote:
> > > > If you misconfigured cgroups, you give more memory to them.
> > >
> > > If you do not have enough memory in a cgroup then your application should
> > > slow down (because of page evictions) but the system should not OOM.
> > > Are cgroups broken or why are you getting OOMs when using them?
> >
> > See mm/oom_kill.c::mem_cgroup_out_of_memory().  A group itself can have
> > an OOM done on it.  It's not a system-wide oom.  We just need to ensure
> > that we continue to differentiate the cgroup-specific oom message from
> > the general one.  Maybe also include some more cgroup info in the debug
> > outbut.
> 
> But that is a resource control isssue. Should also not say out of memory
> but state that the cgroup memory limit was reached.
>

But we are out of memory for the cgroup under consideration. 

-- 
	Balbir
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