From mboxrd@z Thu Jan  1 00:00:00 1970
From: Glauber Costa <glommer@parallels.com>
Subject: Re: [patch 18/18] KVM: x86: update pvclock area conditionally, on
 cpu migration
Date: Thu, 15 Nov 2012 16:34:14 +0400
Message-ID: <50A4E146.3000008@parallels.com>
References: <20121115000823.285102321@redhat.com> <20121115000944.772253863@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
Cc: <kvm@vger.kernel.org>, <johnstul@us.ibm.com>, <jeremy@goop.org>,
	<zamsden@gmail.com>, <gleb@redhat.com>, <avi@redhat.com>,
	<pbonzini@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from mx2.parallels.com ([64.131.90.16]:48649 "EHLO mx2.parallels.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S2993283Ab2KOMeV (ORCPT <rfc822;kvm@vger.kernel.org>);
	Thu, 15 Nov 2012 07:34:21 -0500
In-Reply-To: <20121115000944.772253863@redhat.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On 11/15/2012 04:08 AM, Marcelo Tosatti wrote:
> As requested by Glauber, do not update kvmclock area on vcpu->pcpu 
> migration, in case the host has stable TSC. 
> 
> This is to reduce cacheline bouncing.
> 
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This looks fine, but it can always get tricky...
Assuming you tested this change in at least one stable tsc and one
unstable tsc system:

Acked-by: Glauber Costa <glommer@parallels.com>