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Date: Tue, 21 Aug 2007 03:13:13 +0200
From: Andi Kleen <andi@firstfloor.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <andi@firstfloor.org>, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org
Subject: Re: [RFC 7/7] Switch of PF_MEMALLOC during writeout
Message-ID: <20070821011313.GA23935@one.firstfloor.org>
References: <20070820215040.937296148@sgi.com> <20070820215317.441134723@sgi.com> <p73ps1hztwp.fsf@bingen.suse.de> <Pine.LNX.4.64.0708201618060.32662@schroedinger.engr.sgi.com>
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> Right. I am not sure exactly how to handle that. There is also the issue 
> of the writes being deferred. I thought maybe of using pdflush to writeout 
> the pages? Maybe increase priority of the pdflush so that it runs 
> immediately when notified. Shrink_page_list would gather the dirty pages 
> in pvecs and then forward to a pdflush. That may make the whole thing much 
> cleaner.

Not sure anything complicated is needed.

You could just add another process flag and set PF_MEMALLOC on the first
recursion?

-Andi