linux-kernel - Re: [PATCH 1 of 4] mm: add a ptep_modify

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Message-Id: <1213835971.8011.54.camel@pasglop>
Date:	Thu, 19 Jun 2008 10:39:31 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel <xen-devel@...ts.xensource.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel <kvm-devel@...ts.sourceforge.net>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Hugh Dickins <hugh@...itas.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction
	abstraction

On Wed, 2008-06-18 at 17:24 -0700, Linus Torvalds wrote:
> 
> On Wed, 18 Jun 2008, Jeremy Fitzhardinge wrote:
> >
> > Along the lines of:
> 
> Hell no. There's a reason we have a special set_wrprotect() thing. We can 
> do it more efficiently on native hardware by just clearing the bit 
> atomically. No need to do the cmpxchg games.

But we can't batch ... 

Ben.


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