linux-kernel - Re: [RFC 5/8] Make writeout during reclaim cpuset aware

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Message-ID: <Pine.LNX.4.64.0701162021320.4849@schroedinger.engr.sgi.com>
Date:	Tue, 16 Jan 2007 20:23:04 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <ak@...e.de>
cc:	akpm@...l.org, Paul Menage <menage@...gle.com>,
	linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>, linux-mm@...ck.org,
	Paul Jackson <pj@....com>, Dave Chinner <dgc@....com>
Subject: Re: [RFC 5/8] Make writeout during reclaim cpuset aware

On Wed, 17 Jan 2007, Andi Kleen wrote:

> On Tuesday 16 January 2007 16:48, Christoph Lameter wrote:
> > Direct reclaim: cpuset aware writeout
> >
> > During direct reclaim we traverse down a zonelist and are carefully
> > checking each zone if its a member of the active cpuset. But then we call
> > pdflush without enforcing the same restrictions. In a larger system this
> > may have the effect of a massive amount of pages being dirtied and then
> > either
> 
> Is there a reason this can't be just done by node, ignoring the cpusets? 

We want to writeout dirty pages that help our situation. Those are located 
on the nodes of the cpuset.
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