From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58646) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YaH8w-0000Fo-Cf for qemu-devel@nongnu.org; Tue, 24 Mar 2015 01:12:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YaH8p-0006mG-QR for qemu-devel@nongnu.org; Tue, 24 Mar 2015 01:12:46 -0400 Received: from ozlabs.org ([2401:3900:2:1::2]:60738) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YaH8p-0006ll-DB for qemu-devel@nongnu.org; Tue, 24 Mar 2015 01:12:39 -0400 Date: Tue, 24 Mar 2015 15:58:35 +1100 From: David Gibson Message-ID: <20150324045835.GC25043@voom.fritz.box> References: <1424883128-9841-1-git-send-email-dgilbert@redhat.com> <1424883128-9841-39-git-send-email-dgilbert@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="gVoQHMRaLt/xBMav" Content-Disposition: inline In-Reply-To: <1424883128-9841-39-git-send-email-dgilbert@redhat.com> Subject: Re: [Qemu-devel] [PATCH v5 38/45] Don't sync dirty bitmaps in postcopy List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Dr. David Alan Gilbert (git)" Cc: aarcange@redhat.com, yamahata@private.email.ne.jp, quintela@redhat.com, qemu-devel@nongnu.org, amit.shah@redhat.com, pbonzini@redhat.com, yanghy@cn.fujitsu.com --gVoQHMRaLt/xBMav Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Feb 25, 2015 at 04:52:01PM +0000, Dr. David Alan Gilbert (git) wrot= e: > From: "Dr. David Alan Gilbert" >=20 > Once we're in postcopy the source processors are stopped and memory > shouldn't change any more, so there's no need to look at the dirty > map. >=20 > There are two notes to this: > 1) If we do resync and a page had changed then the page would get > sent again, which the destination wouldn't allow (since it might > have also modified the page) I'm not quite sure what you mean by "resync" in this context. > 2) Before disabling this I'd seen very rare cases where a page had been > marked dirtied although the memory contents are apparently identical >=20 > Signed-off-by: Dr. David Alan Gilbert Reviewed-by: David Gibson --=20 David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson --gVoQHMRaLt/xBMav Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJVEO77AAoJEGw4ysog2bOSLggP/3rvPuTqDdJpB2hhPUA/KYxW 67GyX8si4+qZqjjvs213wFdR5pMtCB9dfVUSHOc8IqgaX2VCDw5xK2L9ckZls6iK lEbvyR2FG1lqsqKAGqyDeBfS9oFi42pOUWwh+Z7CIrt0qyxJ2MXic9Rea+JcLCXF W0n6BiFNHMK91pXhR7QrL8nFiWYvDMuc4D7uwnxQdww2C52TfvKDDBa+56QFmhwi ZFxcFW9DvFYRh9JHHHsZb3IVV9moj6iOPy/11mXSPMXl5g8BTckH+tYuMXpZxSwZ dEFNrwTanSHesAsq6/TNKYUGw62a1ed4HUoc+B39PVWRhKeIsUHu46CMkmUjX2H7 gPZ7CMs+AxvO7iVDVUxMWaR9hsRYVRzVpeVzUFNMZvs6sYYPpzNANfeCFsnv53Ui Ver6Z4DnKAu1PJUGm4vKOKhfIk3xIcS21+DwtLnUNmb4Xn8xo2VDpky0f6v0pA0L AcqoaVRwkE4b+tyPH6qlgQ35bLk84hjAyLmjVJZOY0t7xH+j5MbkYgc/iV9cloWo Wj1G7TOPQ4EtztGjZckgzhKNCxTdZ1S6YkoII1E56u0T+jSOYZJaYNpjJOWFsUhn /mIVia/0FgqFrzJYlj1AhQI2AtsKUKuRSel21Sl0KirxPX7lSuMfFsB1HEs8ofgI q1XmUl516xAkvJF8eKHE =UVln -----END PGP SIGNATURE----- --gVoQHMRaLt/xBMav--