linux-kernel - Re: [PATCH 15/63] Revert "mm: sched: numa: Delay PTE scanning until a task is scheduled on a new node"

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Message-ID: <5252F2A1.4040204@redhat.com>
Date:	Mon, 07 Oct 2013 13:42:57 -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 15/63] Revert "mm: sched: numa: Delay PTE scanning until
 a task is scheduled on a new node"

On 10/07/2013 06:28 AM, Mel Gorman wrote:
> PTE scanning and NUMA hinting fault handling is expensive so commit
> 5bca2303 ("mm: sched: numa: Delay PTE scanning until a task is scheduled
> on a new node") deferred the PTE scan until a task had been scheduled on
> another node. The problem is that in the purely shared memory case that
> this may never happen and no NUMA hinting fault information will be
> captured. We are not ruling out the possibility that something better
> can be done here but for now, this patch needs to be reverted and depend
> entirely on the scan_delay to avoid punishing short-lived processes.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>

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


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