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Subject: Re: Regression: x86/mm: new _PTE_SWP_SOFT_DIRTY bit conflicts with existing use
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Wed, 21 Aug 2013 16:22:21 +0200
To: Cyrill Gorcunov <gorcunov@gmail.com>
CC: David Vrabel <david.vrabel@citrix.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Pavel Emelyanov <xemul@parallels.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Ingo Molnar <mingo@redhat.com>, Xen-devel@lists.xen.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Jan Beulich <jbeulich@suse.com>
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OK now I'm confused.  I guess I shouldn't comment while on vacation and cache cold on everything.

Cyrill Gorcunov <gorcunov@gmail.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).

-- 
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