linux-kernel - Re: [PATCH 9/9] writeback: Prioritise dirty inodes encountered by reclaim for background flushing

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Message-ID: <20100728110807.GB31360@infradead.org>
Date:	Wed, 28 Jul 2010 07:08:07 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.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>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Hellwig <hch@...radead.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH 9/9] writeback: Prioritise dirty inodes encountered by
 reclaim for background flushing

On Wed, Jul 28, 2010 at 11:27:23AM +0100, Mel Gorman wrote:
> It is preferable that as few dirty pages are dispatched for cleaning from
> the page reclaim path. When dirty pages are encountered by page reclaim,
> this patch marks the inodes that they should be dispatched immediately. When
> the background flusher runs, it moves such inodes immediately to the dispatch
> queue regardless of inode age.

Thus whole thing looks rather hacky to me.  Does it really give a large
enough benefit to be worth all the hacks?

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