Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754842AbcDSPDL (ORCPT ); Tue, 19 Apr 2016 11:03:11 -0400 Received: from mga01.intel.com ([192.55.52.88]:3598 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754742AbcDSPDI (ORCPT ); Tue, 19 Apr 2016 11:03:08 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,506,1455004800"; d="scan'208";a="961978055" 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+Q3AOAgACHhcA= Date: Tue, 19 Apr 2016 15:02:09 +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> In-Reply-To: <1461077659.3200.8.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: eyJDYXRlZ29yeUxhYmVscyI6IiIsIk1ldGFkYXRhIjp7Im5zIjoiaHR0cDpcL1wvd3d3LnRpdHVzLmNvbVwvbnNcL0ludGVsMyIsImlkIjoiMTFjNzBkYTAtOGRlZC00MTAwLTg0NGEtMWRmY2ZhY2NhZjY1IiwicHJvcHMiOlt7Im4iOiJDVFBDbGFzc2lmaWNhdGlvbiIsInZhbHMiOlt7InZhbHVlIjoiQ1RQX0lDIn1dfV19LCJTdWJqZWN0TGFiZWxzIjpbXSwiVE1DVmVyc2lvbiI6IjE1LjkuNi42IiwiVHJ1c3RlZExhYmVsSGFzaCI6IjBDd2JPXC9JRWFrMVNRSnZmOUhYNDBmQ1NyeFwveXE4MTU1UnRYanM5S00wUT0ifQ== 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 u3JF3F6Q027690 Content-Length: 626 Lines: 15 > 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 ... Liang