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Tue, 5 Jul 2022 14:34:21 +0000 (UTC) Received: from redhat.com (unknown [10.33.36.72]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B77CE40CFD05; Tue, 5 Jul 2022 14:34:19 +0000 (UTC) Date: Tue, 5 Jul 2022 15:34:17 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: "Dr. David Alan Gilbert" Cc: Juan Quintela , qemu-devel@nongnu.org, Leonardo Bras , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Marcel Apfelbaum , Eduardo Habkost , Yanan Wang Subject: Re: [PATCH 5/5] multifd: Only sync once each full round of memory Message-ID: References: <20220621140507.1246-1-quintela@redhat.com> <20220621140507.1246-6-quintela@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.2.6 (2022-06-05) X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Jul 05, 2022 at 02:56:35PM +0100, Dr. David Alan Gilbert wrote: > * Juan Quintela (quintela@redhat.com) wrote: > > We need to add a new flag to mean to sync at that point. > > Notice that we still synchronize at the end of setup and at the end of > > complete stages. > > > > Signed-off-by: Juan Quintela > > --- > > migration/migration.c | 2 +- > > migration/ram.c | 42 ++++++++++++++++++++++++++++++------------ > > 2 files changed, 31 insertions(+), 13 deletions(-) > > > > diff --git a/migration/migration.c b/migration/migration.c > > index 3f79df0b70..6627787fc2 100644 > > --- a/migration/migration.c > > +++ b/migration/migration.c > > @@ -4283,7 +4283,7 @@ static Property migration_properties[] = { > > DEFAULT_MIGRATE_ANNOUNCE_STEP), > > /* We will change to false when we introduce the new mechanism */ > > DEFINE_PROP_BOOL("multifd-sync-each-iteration", MigrationState, > > - multifd_sync_each_iteration, true), > > + multifd_sync_each_iteration, false), > > > > /* Migration capabilities */ > > DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), > > diff --git a/migration/ram.c b/migration/ram.c > > index 2c7289edad..6792986565 100644 > > --- a/migration/ram.c > > +++ b/migration/ram.c > > @@ -81,6 +81,7 @@ > > #define RAM_SAVE_FLAG_XBZRLE 0x40 > > /* 0x80 is reserved in migration.h start with 0x100 next */ > > #define RAM_SAVE_FLAG_COMPRESS_PAGE 0x100 > > +#define RAM_SAVE_FLAG_MULTIFD_SYNC 0x200 > > Note this is the very last usable flag! > We could do with avoiding using them as flags where we dont need to. Before it is too late, shouldn't we do #define RAM_SAVE_FLAG_BIGGER_FLAGS 0x200 to indicate that this will be followed by another uint64 value giving us another 64 flags to play with ? With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|