linux-kernel - Re: [PATCH 02/40] x86: mm: drop TLB flush from ptep_set_access

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Date:	Fri, 23 Nov 2012 09:09:09 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Alex Shi <lkml.alex@...il.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/40] x86: mm: drop TLB flush from ptep_set_access_flags

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@...e.de> wrote:
> 
> > From: Rik van Riel <riel@...hat.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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