linux-kernel - Re: [PATCH 5/5] mm: writeback: Prioritise dirty inodes encountered by direct reclaim for background flushing

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Message-ID: <20110714150959.GA30936@infradead.org>
Date:	Thu, 14 Jul 2011 11:09:59 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	XFS <xfs@....sgi.com>, Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	Johannes Weiner <jweiner@...hat.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH 5/5] mm: writeback: Prioritise dirty inodes encountered
 by direct reclaim for background flushing

On Wed, Jul 13, 2011 at 03:31:27PM +0100, Mel Gorman wrote:
> It is preferable that no dirty pages are dispatched from the page
> reclaim path. If reclaim is encountering dirty pages, it implies that
> either reclaim is getting ahead of writeback or use-once logic has
> prioritise pages for reclaiming that are young relative to when the
> inode was dirtied.

what does this buy us?  If at all we should prioritize by a zone,
e.g. tell write_cache_pages only to bother with writing things out
if the dirty page is in a given zone.   We'd probably still cluster
around it to make sure we get good I/O patterns, but would only start
I/O if it has a page we actually care about.

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