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