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

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Message-ID: <20100615174353.GA14429@infradead.org>
Date:	Tue, 15 Jun 2010 13:43:53 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Mel Gorman <mel@....ul.ie>, Christoph Hellwig <hch@...radead.org>,
	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>, Rik van Riel <riel@...hat.com>
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 06:37:47PM +0200, Andrea Arcangeli wrote:
> It'd be interesting to verify that things don't fall apart with
> current xfs if you swapon ./file_on_xfs instead of /dev/something.

I can give it a try, but I don't see why it would make any difference.
Swap files bypass the filesystem completely during the I/O phase as the
swap code builts an extent map during swapon and then submits bios
by itself.  That also means no allocator calls or other forms of
metadata updates.
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