Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754273AbcDTA5i (ORCPT ); Tue, 19 Apr 2016 20:57:38 -0400 Received: from mga02.intel.com ([134.134.136.20]:13596 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753601AbcDTA5f (ORCPT ); Tue, 19 Apr 2016 20:57:35 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,507,1455004800"; d="scan'208";a="936038939" From: "Li, Liang Z" To: Rik van Riel , "mst@redhat.com" , "viro@zeniv.linux.org.uk" , "linux-kernel@vger.kernel.org" , "quintela@redhat.com" , "amit.shah@redhat.com" , "pbonzini@redhat.com" , "dgilbert@redhat.com" CC: "linux-mm@kvack.org" , "kvm@vger.kernel.org" , "qemu-devel@nongnu.org" , "agraf@suse.de" , "borntraeger@de.ibm.com" Subject: RE: [PATCH kernel 1/2] mm: add the related functions to build the free page bitmap Thread-Topic: [PATCH kernel 1/2] mm: add the related functions to build the free page bitmap Thread-Index: AQHRmknpgl1kdv1qZESOs9NZnESE3J+Q3AOAgACHhcD//4F7AIABJUAQ Date: Wed, 20 Apr 2016 00:57:27 +0000 Message-ID: References: <1461076474-3864-1-git-send-email-liang.z.li@intel.com> <1461076474-3864-2-git-send-email-liang.z.li@intel.com> <1461077659.3200.8.camel@redhat.com> <1461079592.3200.9.camel@redhat.com> In-Reply-To: <1461079592.3200.9.camel@redhat.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-titus-metadata-40: eyJDYXRlZ29yeUxhYmVscyI6IiIsIk1ldGFkYXRhIjp7Im5zIjoiaHR0cDpcL1wvd3d3LnRpdHVzLmNvbVwvbnNcL0ludGVsMyIsImlkIjoiMjJkOWEyMzItZWQzMS00MDdkLThkZmItYjVhYjNiNzRhYmFlIiwicHJvcHMiOlt7Im4iOiJDVFBDbGFzc2lmaWNhdGlvbiIsInZhbHMiOlt7InZhbHVlIjoiQ1RQX0lDIn1dfV19LCJTdWJqZWN0TGFiZWxzIjpbXSwiVE1DVmVyc2lvbiI6IjE1LjkuNi42IiwiVHJ1c3RlZExhYmVsSGFzaCI6IlNPWDhCNkRRY2dWTHl6OWwzYnQ3Zm1SaEp1VHNcL2RxZnJQXC90Z2Noek5IUT0ifQ== x-ctpclassification: CTP_IC x-originating-ip: [10.239.127.40] Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id u3K0vij4030804 Content-Length: 843 Lines: 23 > On Tue, 2016-04-19 at 15:02 +0000, Li, Liang Z wrote: > > > > > > On Tue, 2016-04-19 at 22:34 +0800, Liang Li wrote: > > > > > > > > The free page bitmap will be sent to QEMU through virtio interface > > > > and used for live migration optimization. > > > > Drop the cache before building the free page bitmap can get more > > > > free pages. Whether dropping the cache is decided by user. > > > > > > > How do you prevent the guest from using those recently-freed pages > > > for something else, between when you build the bitmap and the live > > > migration completes? > > Because the dirty page logging is enabled before building the bitmap, > > there is no need to prevent the guest from using the recently-freed > > pages ... > > Fair enough. > > It would be good to have that mentioned in the changelog. Yes, I will. Thanks! Liang