linux-kernel - Re: [patch] cpusets: do not allow TIF

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Date:	Wed, 6 Jun 2007 00:39:20 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Paul Jackson <pj@....com>
Cc:	David Rientjes <rientjes@...gle.com>, peterz@...radead.org,
	ak@...e.de, clameter@...ulhu.engr.sgi.com,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] cpusets: do not allow TIF_MEMDIE tasks to allocate
 globally

On Wed, 6 Jun 2007 00:34:21 -0700 Paul Jackson <pj@....com> wrote:

> > a separate exclusive cpuset mlock'd a gigantic amount of 
> > memory and it could not reliably exit because the mlock continued to 
> > allocate outside its own cpuset and eventually OOM'd system-critical tasks 
> > or depleated all system memory.
> 
> Seems like that mlock code is able then to get great globs of memory
> without returning to user space ... perhaps that's where the fix
> should be ... that code should quit chewing up memory if it's
> marked MEMDIE or some such?

yup.  A fix for that is in the pipeline: bale from get_user_pages()
if TIF_MEMDIE is set.
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