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

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Message-Id: <20070117000158.a2e7016e.pj@sgi.com>
Date:	Wed, 17 Jan 2007 00:01:58 -0800
From:	Paul Jackson <pj@....com>
To:	Andrew Morton <akpm@...l.org>
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

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.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.925.600.0401
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