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Date:	Sun, 07 Apr 2013 11:23:06 -0400
From:	KOSAKI Motohiro <>
To:	Cody P Schafer <>
CC:	Andrew Morton <>,
	Mel Gorman <>, Linux MM <>,
	LKML <>,
Subject: Re: [PATCH 0/3] mm: fixup changers of per cpu pageset's ->high and

(4/5/13 4:33 PM), Cody P Schafer wrote:
> In one case while modifying the ->high and ->batch fields of per cpu pagesets
> we're unneededly using stop_machine() (patches 1 & 2), and in another we don't have any
> syncronization at all (patch 3).
> This patchset fixes both of them.
> Note that it results in a change to the behavior of zone_pcp_update(), which is
> used by memory_hotplug. I _think_ that I've diserned (and preserved) the
> essential behavior (changing ->high and ->batch), and only eliminated unneeded
> actions (draining the per cpu pages), but this may not be the case.

at least, memory hotplug need to drain.

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