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

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Message-ID: <20100630130504.GT1993@think>
Date:	Wed, 30 Jun 2010 09:05:04 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	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 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).

-chris
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