linux-kernel - Re: [PATCH 33/63] sched: Retry migration of tasks to CPU on a preferred node

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Message-ID: <5253044C.9090000@redhat.com>
Date:	Mon, 07 Oct 2013 14:58:20 -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 33/63] sched: Retry migration of tasks to CPU on a preferred
 node

On 10/07/2013 06:29 AM, Mel Gorman wrote:
> When a preferred node is selected for a tasks there is an attempt to migrate
> the task to a CPU there. This may fail in which case the task will only
> migrate if the active load balancer takes action. This may never happen if
> the conditions are not right. This patch will check at NUMA hinting fault
> time if another attempt should be made to migrate the task. It will only
> make an attempt once every five seconds.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>
> Signed-off-by: Peter Zijlstra <peterz@...radead.org>

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

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