From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vk0-f71.google.com (mail-vk0-f71.google.com [209.85.213.71]) by kanga.kvack.org (Postfix) with ESMTP id AF6D56B007E for ; Tue, 19 Apr 2016 11:26:53 -0400 (EDT) Received: by mail-vk0-f71.google.com with SMTP id f185so36682796vkb.3 for ; Tue, 19 Apr 2016 08:26:53 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id k52si25354379qge.122.2016.04.19.08.26.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Apr 2016 08:26:53 -0700 (PDT) Message-ID: <1461079592.3200.9.camel@redhat.com> Subject: Re: [PATCH kernel 1/2] mm: add the related functions to build the free page bitmap From: Rik van Riel Date: Tue, 19 Apr 2016 11:26:32 -0400 In-Reply-To: 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> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: "Li, Liang Z" , "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" 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org