linux-kernel - Re: [PATCH v3 -mm 3/3] mm: only defer compaction for failed order and higher

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Message-ID: <20120130104718.GC25268@csn.ul.ie>
Date:	Mon, 30 Jan 2012 10:47:18 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-mm@...ck.org, lkml <linux-kernel@...r.kernel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH v3 -mm 3/3] mm: only defer compaction for failed order
 and higher

On Thu, Jan 26, 2012 at 03:01:02PM -0500, Rik van Riel wrote:
> Currently a failed order-9 (transparent hugepage) compaction can
> lead to memory compaction being temporarily disabled for a memory
> zone.  Even if we only need compaction for an order 2 allocation,
> eg. for jumbo frames networking.
> 
> The fix is relatively straightforward: keep track of the highest
> order at which compaction is succeeding, and only defer compaction
> for orders at which compaction is failing.
> 
> Signed-off-by: Rik van Riel <riel@...hat.com>

Acked-by: Mel Gorman <mel@....ul.ie>

-- 
Mel Gorman
SUSE Labs
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