linux-kernel - Re: [PATCH] memory-hotplug: fix zone stat mismatch

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Date:	Wed, 19 Sep 2012 14:05:20 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Shaohua Li <shli@...ionio.com>
Subject: Re: [PATCH] memory-hotplug: fix zone stat mismatch

On Wed, Sep 19, 2012 at 3:29 AM, Minchan Kim <minchan@...nel.org> wrote:
> During memory-hotplug stress test, I found NR_ISOLATED_[ANON|FILE]
> are increasing so that kernel are hang out.
>
> The cause is that when we do memory-hotadd after memory-remove,
> __zone_pcp_update clear out zone's ZONE_STAT_ITEMS in setup_pageset
> without draining vm_stat_diff of all CPU.
>
> This patch fixes it.

zone_pcp_update() is called from online pages path. but IMHO,
the statistics should be drained offline path. isn't it?

thanks.
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