linux-ext4 - Re: [patch 1/4] mm: exclude reserved pages from dirtyable memory

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Date:	Tue, 20 Sep 2011 11:21:15 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Johannes Weiner <jweiner@...hat.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Minchan Kim <minchan.kim@...il.com>,
	Chris Mason <chris.mason@...cle.com>,
	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>, xfs@....sgi.com,
	linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] mm: exclude reserved pages from dirtyable memory

On 09/20/2011 09:45 AM, Johannes Weiner wrote:
> The amount of dirtyable pages should not include the total number of
> free pages: there is a number of reserved pages that the page
> allocator and kswapd always try to keep free.
>
> The closer (reclaimable pages - dirty pages) is to the number of
> reserved pages, the more likely it becomes for reclaim to run into
> dirty pages:

> Signed-off-by: Johannes Weiner<jweiner@...hat.com>

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