linux-kernel - Re: [PATCH 13/14] fs,btrfs: Allow kswapd to writeback pages

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Message-ID: <20100701095509.GF31741@csn.ul.ie>
Date:	Thu, 1 Jul 2010 10:55:10 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Chris Mason <chris.mason@...cle.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	Dave Chinner <david@...morbit.com>,
	Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Hellwig <hch@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH 13/14] fs,btrfs: Allow kswapd to writeback pages

On Wed, Jun 30, 2010 at 09:05:04AM -0400, Chris Mason wrote:
> On Tue, Jun 29, 2010 at 12:34:47PM +0100, Mel Gorman wrote:
> > As only kswapd and memcg are writing back pages, there should be no
> > danger of overflowing the stack. Allow the writing back of dirty pages
> > in btrfs from the VM.
> > 
> > Signed-off-by: Mel Gorman <mel@....ul.ie>
> 
> Signed-off-by: Chris Mason <chris.mason@...cle.com>
> 
> But, this is only the metadata writepage.  fs/btrfs/inode.c has another
> one for data pages.  (just look for PF_MEMALLOC).
> 

My bad, fixed now. Thanks.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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