From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH 1/1 v2] KVM: MMU: Optimize guest page table walk
Date: Sun, 24 Apr 2011 10:27:06 +0300
Message-ID: <4DB3D0CA.6050007@redhat.com>
References: <20110422003222.9d08aee3.takuya.yoshikawa@gmail.com> <20110422003444.5b3a876a.takuya.yoshikawa@gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: mtosatti@redhat.com, kvm@vger.kernel.org,
	yoshikawa.takuya@oss.ntt.co.jp, xiaoguangrong@cn.fujitsu.com,
	Joerg.Roedel@amd.com
To: Takuya Yoshikawa <takuya.yoshikawa@gmail.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from mx1.redhat.com ([209.132.183.28]:3447 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1750807Ab1DXH1V (ORCPT <rfc822;kvm@vger.kernel.org>);
	Sun, 24 Apr 2011 03:27:21 -0400
In-Reply-To: <20110422003444.5b3a876a.takuya.yoshikawa@gmail.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On 04/21/2011 06:34 PM, Takuya Yoshikawa wrote:
> From: Takuya Yoshikawa<yoshikawa.takuya@oss.ntt.co.jp>
>
> This patch optimizes the guest page table walk by using get_user()
> instead of copy_from_user().
>
> With this patch applied, paging64_walk_addr_generic() has become
> about 0.5us to 1.0us faster on my Phenom II machine with NPT on.

Applied, thanks.  Care to send a follow-on patch that makes 
cmpxchg_gpte() use ptep_user instead of calculating it by itself?

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.