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Date: Fri, 23 Nov 2012 09:09:09 +0000
From: Mel Gorman <mgorman@suse.de>
Subject: Re: [PATCH 02/40] x86: mm: drop TLB flush from ptep_set_access_flags
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, Andrea Arcangeli <aarcange@redhat.com>, Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>, Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, Hugh Dickins <hughd@google.com>, Thomas Gleixner <tglx@linutronix.de>, Paul Turner <pjt@google.com>, Lee Schermerhorn <Lee.Schermerhorn@hp.com>, Alex Shi <lkml.alex@gmail.com>, Srikar Dronamraju <srikar@linux.vnet.ibm.com>, Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>

On Thu, Nov 22, 2012 at 08:56:37PM +0000, Alan Cox wrote:
> On Thu, 22 Nov 2012 19:25:15 +0000
> Mel Gorman <mgorman@suse.de> wrote:
> 
> > From: Rik van Riel <riel@redhat.com>
> > 
> > Intel has an architectural guarantee that the TLB entry causing
> > a page fault gets invalidated automatically. This means
> > we should be able to drop the local TLB invalidation.
> 
> Can we get an AMD sign off on that ?
> 

Hi Alan,

You sortof can[1]. Borislav Petkov answered that they do
https://lkml.org/lkml/2012/11/17/85 and quoted the manual at
https://lkml.org/lkml/2012/10/29/414 saying that this should be ok.

[1] There is no delicate way of putting it. I've no idea what the
    current status of current and former AMD kernel developers is.

-- 
Mel Gorman
SUSE Labs

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