linux-kernel - Re: [PATCH v3 9/9] memory-hotplug: allocate zone's pcp before onlining pages

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Date:	Fri, 19 Oct 2012 03:07:24 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	wency@...fujitsu.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	rientjes@...gle.com, liuj97@...il.com, len.brown@...el.com,
	benh@...nel.crashing.org, paulus@...ba.org, minchan.kim@...il.com,
	akpm@...ux-foundation.org, isimatu.yasuaki@...fujitsu.com,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH v3 9/9] memory-hotplug: allocate zone's pcp before
 onlining pages

On Fri, Oct 19, 2012 at 2:46 AM,  <wency@...fujitsu.com> wrote:
> From: Wen Congyang <wency@...fujitsu.com>
>
> We use __free_page() to put a page to buddy system when onlining pages.
> __free_page() will store NR_FREE_PAGES in zone's pcp.vm_stat_diff, so we
> should allocate zone's pcp before onlining pages, otherwise we will lose
> some free pages.
>
> CC: David Rientjes <rientjes@...gle.com>
> CC: Jiang Liu <liuj97@...il.com>
> CC: Len Brown <len.brown@...el.com>
> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> CC: Paul Mackerras <paulus@...ba.org>
> CC: Christoph Lameter <cl@...ux.com>
> Cc: Minchan Kim <minchan.kim@...il.com>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> CC: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> Signed-off-by: Wen Congyang <wency@...fujitsu.com>

Looks good.

Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
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