From: Rik van Riel <riel@redhat.com>
Subject: Re: [patch 1/4] mm: exclude reserved pages from dirtyable memory
Date: Tue, 20 Sep 2011 11:21:15 -0400
Message-ID: <4E78AF6B.5010502@redhat.com>
References: <1316526315-16801-1-git-send-email-jweiner@redhat.com> <1316526315-16801-2-git-send-email-jweiner@redhat.com>
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Cc: Andrew Morton <akpm@linux-foundation.org>, Mel Gorman <mgorman@suse.de>,
        Christoph Hellwig <hch@infradead.org>,
        Dave Chinner <david@fromorbit.com>,
        Wu Fengguang <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz>,
        Minchan Kim <minchan.kim@gmail.com>,
        Chris Mason <chris.mason@oracle.com>, "Theodore Ts'o" <tytso@mit.edu>,
        Andreas Dilger <adilger.kernel@dilger.ca>, xfs@oss.sgi.com,
        linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org,
        linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org
To: Johannes Weiner <jweiner@redhat.com>
Return-path: <owner-linux-mm@kvack.org>
In-Reply-To: <1316526315-16801-2-git-send-email-jweiner@redhat.com>
Sender: owner-linux-mm@kvack.org
List-Id: linux-ext4.vger.kernel.org

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@redhat.com>

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

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