linux-kernel - Re: [patch] mm, compaction: periodically schedule when freeing pages

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Message-ID: <5227C928.8080709@redhat.com>
Date:	Wed, 04 Sep 2013 19:58:32 -0400
From:	Rik van Riel <riel@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch] mm, compaction: periodically schedule when freeing pages

On 09/04/2013 07:25 PM, David Rientjes wrote:
> We've been getting warnings about an excessive amount of time spent
> allocating pages for migration during memory compaction without
> scheduling.  isolate_freepages_block() already periodically checks for
> contended locks or the need to schedule, but isolate_freepages() never
> does.
> 
> When a zone is massively long and no suitable targets can be found, this
> iteration can be quite expensive without ever doing cond_resched().
> 
> Check periodically for the need to reschedule while the compaction free
> scanner iterates.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>

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

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