From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755910Ab2DJKEU (ORCPT ); Tue, 10 Apr 2012 06:04:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:17094 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751294Ab2DJKES (ORCPT ); Tue, 10 Apr 2012 06:04:18 -0400 Message-ID: <4F84059D.80606@redhat.com> Date: Tue, 10 Apr 2012 13:04:13 +0300 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120316 Thunderbird/11.0 MIME-Version: 1.0 To: Marcelo Tosatti CC: Xiao Guangrong , Xiao Guangrong , LKML , KVM Subject: Re: [PATCH 00/13] KVM: MMU: fast page fault References: <4F742951.7080003@linux.vnet.ibm.com> <4F82E04E.6000900@redhat.com> <20120409175829.GB21894@amt.cnet> <4F8329D3.7000605@gmail.com> <20120409194614.GB23053@amt.cnet> In-Reply-To: <20120409194614.GB23053@amt.cnet> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/09/2012 10:46 PM, Marcelo Tosatti wrote: > Perhaps the mmu_lock hold times by get_dirty are a large component here? That's my concern, because it affects the scaling of migration for wider guests. > If that can be alleviated, not only RO->RW faults benefit. Those are the most common types of faults on modern hardware, no? -- error compiling committee.c: too many arguments to function