linux-kernel - Re: [PATCH v3] memory-hotplug: fix zone stat mismatch

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Message-ID: <20120920073719.GH13234@bbox>
Date:	Thu, 20 Sep 2012 16:37:19 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH v3] memory-hotplug: fix zone stat mismatch

Hi Yasuaki,

On Thu, Sep 20, 2012 at 04:21:13PM +0900, Yasuaki Ishimatsu wrote:
> Hi Minchan,
> 
> Sorry for late reply.
> 
> 2012/09/20 15:43, Minchan Kim wrote:
> > During memory-hotplug, I found NR_ISOLATED_[ANON|FILE]
> > are increasing so that kernel are hang out.
> 
> Why does your system hang out by increasing NR_ISOLATED_[ANON|FILE]?
> I cannot understand what has happened by your system.

If system doesn't have enough free page, it goes reclaim path and never
reclaim any pages by too_many_isolated and loop forever.

--
Kind regards,
Minchan Kim
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