linux-kernel - Re: Regression: x86/mm: new _PTE_SWP_SOFT_DIRTY bit conflicts with existing use

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Message-ID: <4455be44-7daf-41f0-add6-087cf992868f@email.android.com>
Date:	Wed, 21 Aug 2013 16:22:21 +0200
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	David Vrabel <david.vrabel@...rix.com>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Emelyanov <xemul@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, Xen-devel@...ts.xen.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Jan Beulich <jbeulich@...e.com>
Subject: Re: Regression: x86/mm: new _PTE_SWP_SOFT_DIRTY bit conflicts with existing use

OK now I'm confused.  I guess I shouldn't comment while on vacation and cache cold on everything.

Cyrill Gorcunov <gorcunov@...il.com> wrote:
>On Wed, Aug 21, 2013 at 04:11:25PM +0200, H. Peter Anvin wrote:
>>
>> Eep.  This should be reverted, indeed.  This isn't a manifest bug on
>!Xen but we
>> have gotten requests for WT support which would mean adding in the
>PAT but again.
>
>Please no, letme fix it. That's what I'm having in mind: don't use pse
>bit in swap
>entry but always mark page read from swap as dirty one (it's better
>than having
>no tracker at all and  will be the case on old machines with 32bit ptes
>only).

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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