linux-kernel - Re: [RFC 0/8] Cpuset aware writeback

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Message-Id: <20070117015734.b74f8a6b.akpm@osdl.org>
Date:	Wed, 17 Jan 2007 01:57:34 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Paul Jackson <pj@....com>
Cc:	clameter@....com, menage@...gle.com, linux-kernel@...r.kernel.org,
	nickpiggin@...oo.com.au, linux-mm@...ck.org, ak@...e.de,
	dgc@....com
Subject: Re: [RFC 0/8] Cpuset aware writeback

> On Wed, 17 Jan 2007 00:01:58 -0800 Paul Jackson <pj@....com> wrote:
> Andrew wrote:
> > - consider going off-cpuset for critical allocations. 
> 
> We do ... in mm/page_alloc.c:
> 
>          * This is the last chance, in general, before the goto nopage.
>          * Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc.
>          * See also cpuset_zone_allowed() comment in kernel/cpuset.c.
>          */
>         page = get_page_from_freelist(gfp_mask, order, zonelist, alloc_flags);
> 
> We also allow GFP_KERNEL requests to escape the current cpuset, to the nearest
> enclosing mem_exclusive cpuset, which is typically a big cpuset covering most
> of the system.

hrm.   So how come NFS is getting oom-killings?

The oom-killer normally spews lots of useful stuff, including backtrace.  For some
reason that's not coming out for Christoph.  Log facility level, perhaps?
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