linux-kernel - Re: [PATCH 28/63] sched: Remove check that skips small VMAs

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Date:	Mon, 07 Oct 2013 14:44:24 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 28/63] sched: Remove check that skips small VMAs

On 10/07/2013 06:29 AM, Mel Gorman wrote:
> task_numa_work skips small VMAs. At the time the logic was to reduce the
> scanning overhead which was considerable. It is a dubious hack at best.
> It would make much more sense to cache where faults have been observed
> and only rescan those regions during subsequent PTE scans. Remove this
> hack as motivation to do it properly in the future.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>

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

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