linux-kernel - Re: [PATCH 0/3] mm: fixup changers of per cpu pageset's ->high and ->batch

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Date:	Sun, 07 Apr 2013 09:32:04 +0800
From:	Simon Jeons <simon.jeons@...il.com>
To:	Cody P Schafer <cody@...ux.vnet.ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] mm: fixup changers of per cpu pageset's ->high and
 ->batch

Hi Cody,
On 04/06/2013 04:33 AM, 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).

Do you mean stop_machine() is used for syncronization between each 
online cpu?

>
> 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.
>
> --
>   mm/page_alloc.c | 63 +++++++++++++++++++++++++++------------------------------
>   1 file changed, 30 insertions(+), 33 deletions(-)
>
> --
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