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

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Date:	Tue, 8 Jun 2010 05:08:11 -0400
From:	Christoph Hellwig <hch@...radead.org>
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>,
	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 08, 2010 at 10:02:19AM +0100, Mel Gorman wrote:
> seeky patterns.  The second is that direct reclaim calling the filesystem
> splices two potentially deep call paths together and potentially overflows
> the stack on complex storage or filesystems. This series is an early draft
> at tackling both of these problems and is in three stages.

Btw, one more thing came up when I discussed the issue again with Dave
recently:

 - we also need to care about ->releasepage.  At least for XFS it
   can end up in the same deep allocator chain as ->writepage because
   it does all the extent state conversions, even if it doesn't
   start I/O.  I haven't managed yet to decode the ext4/btrfs codepaths
   for ->releasepage yet to figure out how they release a page that
   covers a delayed allocated or unwritten range.

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