From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH v2 1/7] KVM: MMU: optimize pte write path if don't have
 protected sp
Date: Wed, 18 May 2011 16:20:03 +0300
Message-ID: <4DD3C783.8090003@redhat.com>
References: <4DCFEF3B.5060806@cn.fujitsu.com> <4DD1098E.2070701@redhat.com> <20110518131247.GA10833@amt.cnet>
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Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>,
	LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
To: Marcelo Tosatti <mtosatti@redhat.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <20110518131247.GA10833@amt.cnet>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

On 05/18/2011 04:12 PM, Marcelo Tosatti wrote:
> On Mon, May 16, 2011 at 02:25:02PM +0300, Avi Kivity wrote:
> >  On 05/15/2011 06:20 PM, Xiao Guangrong wrote:
> >  >Simply return from kvm_mmu_pte_write path if no shadow page is
> >  >write-protected, then we can avoid to walk all shadow pages and hold
> >  >mmu-lock
> >
> >  Patchset looks like a very good cleanup (plus the nice optimization
> >  in patch 1).
>
> What case is patch 1 optimizing for?
>

Say, kvmclock updates.

-- 
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