linux-kernel - Re: [PATCH 1/5] x86: change_page_attr

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Date:	Thu, 31 Jan 2008 13:53:16 +0100
From:	Andi Kleen <ak@...e.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Huang, Ying" <ying.huang@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] x86: change_page_attr_clear fix

On Thursday 31 January 2008 13:38:45 Thomas Gleixner wrote:
> On Thu, 31 Jan 2008, Andi Kleen wrote:
> 
> > On Thursday 31 January 2008 08:35:59 Huang, Ying wrote:
> > > This patch replaces __change_page_attr_set_clr() with
> > > change_page_attr_set_clr() in change_page_attr_clear() to flush the
> > > TLB/cache properly.
> > 
> > Good catch :-) It actually only needs to flush TLBs not caches in this 
> > case.
> 
> That's one of the items on our optimizations todo list already. There
> are more low hanging fruits, but we need to make sure that the non
> optimized version is bullet proof first.

I actually ported it already forward from my old patchkit (together
with some other improvements). Will post later.

-Andi
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