linux-kernel - Re: [PATCH] [1/16] HWPOISON: Add page flag for poisoned pages

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Message-ID: <4A2008F0.1070304@redhat.com>
Date:	Fri, 29 May 2009 12:10:24 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	fengguang.wu@...el.com
Subject: Re: [PATCH] [1/16] HWPOISON: Add page flag for poisoned pages

Andi Kleen wrote:
> On Wed, May 27, 2009 at 10:15:10PM +0100, Alan Cox wrote:
>> On Wed, 27 May 2009 22:12:26 +0200 (CEST)
>> Andi Kleen <andi@...stfloor.org> wrote:
>>
>>> Hardware poisoned pages need special handling in the VM and shouldn't be 
>>> touched again. This requires a new page flag. Define it here.
>> Why can't you use PG_reserved ? That already indicates the page may not
>> even be present (which is effectively your situation at that point).
> 
> Right now a page must be present with PG_reserved, otherwise /dev/mem, /proc/kcore
> lots of other things will explode.

Could we use a combination of, say PG_reserved and
PG_writeback to keep /dev/mem and /proc/kcore from
exploding ?

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