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

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Message-ID: <1355190540.1933.4.camel@kernel.cn.ibm.com>
Date:	Mon, 10 Dec 2012 19:49:00 -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 Mon, 2012-12-10 at 16:38 +0100, Andi Kleen wrote:
> > It is another topic, I mean since the page is poisoned, so why not isolate it
> > from page buddy alocator in soft_offline_page() rather than in check_new_page().
> > I find soft_offline_page() only migrate the page and mark HWPoison, the poisoned
> > page is still managed by page buddy alocator.
> 
> Doing it in check_new_page is the only way if the page is currently
> allocated by someone. Since that's not uncommon it's simplest to always
> do it this way.

Hi Andi,

IIUC, soft offlining will isolate and migrate hwpoisoned page, and this
page will not be accessed by memory management subsystem until unpoison,
correct?

                             -Simon

> 
> -Andi
> 


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