linux-kernel - Re: [PATCH 2/2] mm: compaction: add /proc/vmstat entry for rescued MIGRATE

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Message-ID: <4FDA0F82.2030708@gmail.com>
Date:	Thu, 14 Jun 2012 12:21:22 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Dave Jones <davej@...hat.com>, Cong Wang <amwang@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH 2/2] mm: compaction: add /proc/vmstat entry for rescued
 MIGRATE_UNMOVABLE pageblocks

(6/14/12 12:02 PM), Bartlomiej Zolnierkiewicz wrote:
> From: Bartlomiej Zolnierkiewicz<b.zolnierkie@...sung.com>
> Subject: [PATCH] mm: compaction: add /proc/vmstat entry for rescued MIGRATE_UNMOVABLE pageblocks
>
> compact_rescued_unmovable_blocks shows the number of MIGRATE_UNMOVABLE
> pageblocks converted back to MIGRATE_MOVABLE type by the memory compaction
> code.  Non-zero values indicate that large kernel-originated allocations
> of MIGRATE_UNMOVABLE type happen in the system and need special handling
> from the memory compaction code.
>
> This new vmstat entry is optional but useful for development and understanding
> the system.

This description don't describe why admin need this stat and how to use it.


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