linux-kernel - Re: [PATCH 2/3] compaction: compact unevictable page

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Date:	Tue, 30 Aug 2011 21:09:55 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>
Subject: Re: [PATCH 2/3] compaction: compact unevictable page

On 11/12/2011 11:37 AM, Minchan Kim wrote:
> Now compaction doesn't handle mlocked page as it uses __isolate_lru_page
> which doesn't consider unevicatable page. It has been used by just lumpy so
> it was pointless that it isolates unevictable page. But the situation is
> changed. Compaction could handle unevictable page and it can help getting
> big contiguos pages in fragment memory by many pinned page with mlock.
>
> I tested this patch with following scenario.
>
> 1. A : allocate 80% anon pages in system
> 2. B : allocate 20% mlocked page in system
> /* Maybe, mlocked pages are located in low pfn address */
> 3. kill A /* high pfn address are free */
> 4. echo 1>  /proc/sys/vm/compact_memory
>
> old:
>
> compact_blocks_moved 251
> compact_pages_moved 44
>
> new:
>
> compact_blocks_moved 258
> compact_pages_moved 412
>
> CC: Mel Gorman<mgorman@...e.de>
> CC: Johannes Weiner<jweiner@...hat.com>
> CC: Rik van Riel<riel@...hat.com>
> Signed-off-by: Minchan Kim<minchan.kim@...il.com>

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


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