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: <20100719142349.GE12510@infradead.org>
Date:	Mon, 19 Jul 2010 10:23:49 -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>,
	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 Mon, Jul 19, 2010 at 02:11:30PM +0100, Mel Gorman wrote:
> +	/*
> +	 * If reclaim is encountering dirty pages, it may be because
> +	 * dirty pages are reaching the end of the LRU even though
> +	 * the dirty_ratio may be satisified. In this case, wake
> +	 * flusher threads to pro-actively clean some pages
> +	 */
> +	wakeup_flusher_threads(laptop_mode ? 0 : nr_dirty + nr_dirty / 2);
> +

Where is the laptop-mode magic coming from?

And btw, at least currently wakeup_flusher_threads writes back nr_pages
for each BDI, which might not be what you want.  Then again probably
no caller wants it, but I don't see an easy way to fix it.

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