linux-kernel - Re: Misleading OOM messages

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Date:	Fri, 15 May 2009 15:26:43 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
cc:	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,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: Misleading OOM messages

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.

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