linux-kernel - Re: [patch v3 6/6] mm, compaction: terminate async compaction when rescheduling

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Date:	Wed, 7 May 2014 10:41:05 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Greg Thelen <gthelen@...gle.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch v3 6/6] mm, compaction: terminate async compaction when
 rescheduling

On Tue, May 06, 2014 at 07:22:52PM -0700, David Rientjes wrote:
> Async compaction terminates prematurely when need_resched(), see
> compact_checklock_irqsave().  This can never trigger, however, if the 
> cond_resched() in isolate_migratepages_range() always takes care of the 
> scheduling.
> 
> If the cond_resched() actually triggers, then terminate this pageblock scan for 
> async compaction as well.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Acked-by: Mel Gorman <mgorman@...e.de>

-- 
Mel Gorman
SUSE Labs
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