Date: Tue, 15 Jun 2010 13:43:53 -0400
From: Christoph Hellwig <hch@infradead.org>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>, Christoph Hellwig <hch@infradead.org>,
       linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
       linux-mm@kvack.org, Dave Chinner <david@fromorbit.com>,
       Chris Mason <chris.mason@oracle.com>, Nick Piggin <npiggin@suse.de>,
       Rik van Riel <riel@redhat.com>
Subject: Re: [RFC PATCH 0/6] Do not call ->writepage[s] from direct reclaim
 and use a_ops->writepages() where possible
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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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