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

from [Rik van Riel] [Permanent Link][Original]
To: Johannes Weiner <jweiner@xxxxxxxxxx>
Subject: Re: [patch 1/4] mm: exclude reserved pages from dirtyable memory
From: Rik van Riel <riel@xxxxxxxxxx>
Date: Tue, 20 Sep 2011 11:21:15 -0400
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Mel Gorman <mgorman@xxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Wu Fengguang <fengguang.wu@xxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Minchan Kim <minchan.kim@xxxxxxxxx>, Chris Mason <chris.mason@xxxxxxxxxx>, "Theodore Ts'o" <tytso@xxxxxxx>, Andreas Dilger <adilger.kernel@xxxxxxxxx>, xfs@xxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <1316526315-16801-2-git-send-email-jweiner@xxxxxxxxxx>
References: <1316526315-16801-1-git-send-email-jweiner@xxxxxxxxxx> <1316526315-16801-2-git-send-email-jweiner@xxxxxxxxxx>
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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@xxxxxxxxxx>


Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
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