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Re: [RFC PATCH 0/5] Reduce filesystem writeback from page reclaim (again

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [RFC PATCH 0/5] Reduce filesystem writeback from page reclaim (again)
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 14 Jul 2011 00:51:23 -0400
Cc: Mel Gorman <mgorman@xxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, XFS <xfs@xxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Johannes Weiner <jweiner@xxxxxxxxxx>, Wu Fengguang <fengguang.wu@xxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Minchan Kim <minchan.kim@xxxxxxxxx>
In-reply-to: <20110714003340.GZ23038@dastard>
References: <1310567487-15367-1-git-send-email-mgorman@xxxxxxx> <20110714003340.GZ23038@dastard>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Jul 14, 2011 at 10:33:40AM +1000, Dave Chinner wrote:
> patchset. After all, that's what I keep asking for (so we can get
> rid of .writepage altogether), and if the numbers don't add up, then
> I'll shut up about it. ;)

Unfortunately there's a few more users of ->writepage in addition to
memory reclaim.  The most visible on is page migration, but there's also
a write_one_page helper used by a few filesystems that would either
need to get a writepage-like callback or a bigger rewrite.

I agree that killing of ->writepage would be a worthwhile goal, though.

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