linux-kernel - Re: [RFC PATCH 0/6] Do not call ->writepage[s] from direct reclaim and use a

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Message-ID: <20100615165423.GA16868@infradead.org>
Date:	Tue, 15 Jun 2010 12:54:23 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [RFC PATCH 0/6] Do not call ->writepage[s] from direct reclaim
 and use a_ops->writepages() where possible

On Tue, Jun 15, 2010 at 12:49:49PM -0400, Rik van Riel wrote:
> This is already in a filesystem.  Why does ->writepage get
> called a second time?  Shouldn't this have a gfp_mask
> without __GFP_FS set?

Why would it?  GFP_NOFS is not for all filesystem code, but only for
code where we can't re-enter the filesystem due to deadlock potential.

Except for a few filesystems that have transactions open inside
->aio_write no one uses GFP_NOFS from that path.
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