linux-kernel - Re: [PATCH 09/63] mm: Account for a THP NUMA hinting update as one PTE update

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Message-ID: <5252BF13.7060103@redhat.com>
Date:	Mon, 07 Oct 2013 10:02:59 -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 09/63] mm: Account for a THP NUMA hinting update as one
 PTE update

On 10/07/2013 06:28 AM, Mel Gorman wrote:
> A THP PMD update is accounted for as 512 pages updated in vmstat.  This is
> large difference when estimating the cost of automatic NUMA balancing and
> can be misleading when comparing results that had collapsed versus split
> THP. This patch addresses the accounting issue.
> 
> Cc: stable <stable@...r.kernel.org>
> Signed-off-by: Mel Gorman <mgorman@...e.de>

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

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