linux-kernel - Re: [PATCH 8/8] vmscan: Kick flusher threads to clean pages when reclaim is encountering dirty pages

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Message-ID: <4C44A098.1010806@redhat.com>
Date:	Mon, 19 Jul 2010 14:59:36 -0400
From:	Rik van Riel <riel@...hat.com>
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>,
	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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH 8/8] vmscan: Kick flusher threads to clean pages when
 reclaim is encountering dirty pages

On 07/19/2010 09:11 AM, Mel Gorman wrote:
> There are a number of cases where pages get cleaned but two of concern
> to this patch are;
>    o When dirtying pages, processes may be throttled to clean pages if
>      dirty_ratio is not met.
>    o Pages belonging to inodes dirtied longer than
>      dirty_writeback_centisecs get cleaned.
>
> The problem for reclaim is that dirty pages can reach the end of the LRU
> if pages are being dirtied slowly so that neither the throttling cleans
> them or a flusher thread waking periodically.

I can't see a better way to do this without creating
a way-too-big-to-merge patch series, and this patch
should result in the right behaviour, so ...

Acked-by: Rik van Riel <riel@...hat.com>

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