linux-kernel - Re: [PATCH 1/5] mm: compaction: Allow compaction to isolate dirty pages

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Message-ID: <4ECA8781.7090302@redhat.com>
Date:	Mon, 21 Nov 2011 12:16:49 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Linux-MM <linux-mm@...ck.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>, Jan Kara <jack@...e.cz>,
	Andy Isaacson <adi@...apodia.org>,
	Johannes Weiner <jweiner@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] mm: compaction: Allow compaction to isolate dirty
 pages

On 11/18/2011 11:58 AM, Mel Gorman wrote:
> Commit [39deaf85: mm: compaction: make isolate_lru_page() filter-aware]
> noted that compaction does not migrate dirty or writeback pages and
> that is was meaningless to pick the page and re-add it to the LRU list.
>
> What was missed during review is that asynchronous migration moves
> dirty pages if their ->migratepage callback is migrate_page() because
> these can be moved without blocking. This potentially impacted
> hugepage allocation success rates by a factor depending on how many
> dirty pages are in the system.
>
> This patch partially reverts 39deaf85 to allow migration to isolate
> dirty pages again. This increases how much compaction disrupts the
> LRU but that is addressed later in the series.
>
> Signed-off-by: Mel Gorman<mgorman@...e.de>

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

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