linux-kernel - Re: [PATCH V2] MCE: fix an error of mce_bad

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Message-ID: <1355192071.1933.7.camel@kernel.cn.ibm.com>
Date:	Mon, 10 Dec 2012 20:14:31 -0600
From:	Simon Jeons <simon.jeons@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Xishi Qiu <qiuxishi@...wei.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	WuJianguo <wujianguo@...wei.com>,
	Liujiang <jiang.liu@...wei.com>, Vyacheslav.Dubeyko@...wei.com,
	Borislav Petkov <bp@...en8.de>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, wency@...fujitsu.com
Subject: Re: [PATCH V2] MCE: fix an error of mce_bad_pages statistics

On Tue, 2012-12-11 at 03:03 +0100, Andi Kleen wrote:
> > IIUC, soft offlining will isolate and migrate hwpoisoned page, and this
> > page will not be accessed by memory management subsystem until unpoison,
> > correct?
> 
> No, soft offlining can still allow accesses for some time. It'll never kill
> anything.

Oh, it will be putback to lru list during migration. So does your "some
time" mean before call check_new_page?

	               -Simon 

> 
> Hard tries much harder and will kill.
> 
> In some cases (unshrinkable kernel allocation) they end up doing the same
> because there isn't any other alternative though. However these are
> expected to only apply to a small percentage of pages in a typical
> system.
> 
> -Andi


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