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bh=8TdNZZXtj2QIM3kSedxEwP9rkjospgZwtmzzqjlIALQ=; b=T/gQhfGiynIVVjrTu/uMCrnaxoyjEIDulLmUCQSwhQe8khm2Lvez82hZ6y9nf+7d0FoQWi zku/ie3RIlWaqgKhu+wekQCWZ0lyv27qOCl5CyqOXbxfXzmwG1wpRAC4D0wrXOqDno1zHP 89tqeWjYYHyg8I6NFHycHwC8eFQb/qM= X-MC-Unique: 68PDCP9uNDO3Tm4f0SWk3A-1 From: Juan Quintela To: qemu-devel@nongnu.org Cc: Juan Quintela , Leonardo Bras , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Marcel Apfelbaum , Eduardo Habkost , "Dr. David Alan Gilbert" , Yanan Wang Subject: [PATCH 1/5] multifd: Create property multifd-sync-each-iteration Date: Tue, 21 Jun 2022 16:05:03 +0200 Message-Id: <20220621140507.1246-2-quintela@redhat.com> In-Reply-To: <20220621140507.1246-1-quintela@redhat.com> References: <20220621140507.1246-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=quintela@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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1655820441015100001 Content-Type: text/plain; charset="utf-8" We used to synchronize all channels at the end of each RAM section sent. That is not needed, so preparing to only synchronize once every full round in latests patches. Notice that we initialize the property as true. We will change the default when we introduce the new mechanism. Signed-off-by: Juan Quintela Reviewed-by: Dr. David Alan Gilbert --- migration/migration.h | 6 ++++++ hw/core/machine.c | 1 + migration/migration.c | 10 ++++++++++ 3 files changed, 17 insertions(+) diff --git a/migration/migration.h b/migration/migration.h index 485d58b95f..70dae24516 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -332,6 +332,11 @@ struct MigrationState { * This save hostname when out-going migration starts */ char *hostname; + /* + * Synchronize channels after each iteration. + * We used to do that on the past, but it is suboptimal. + */ + bool multifd_sync_each_iteration; }; =20 void migrate_set_state(int *state, int old_state, int new_state); @@ -374,6 +379,7 @@ int migrate_multifd_channels(void); MultiFDCompression migrate_multifd_compression(void); int migrate_multifd_zlib_level(void); int migrate_multifd_zstd_level(void); +bool migrate_multifd_sync_each_iteration(void); =20 #ifdef CONFIG_LINUX bool migrate_use_zero_copy_send(void); diff --git a/hw/core/machine.c b/hw/core/machine.c index a673302cce..c8a60917e0 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -43,6 +43,7 @@ GlobalProperty hw_compat_7_0[] =3D { { "arm-gicv3-common", "force-8-bit-prio", "on" }, { "nvme-ns", "eui64-default", "on"}, + { "migration", "multifd-sync-each-iteration", "on"}, }; const size_t hw_compat_7_0_len =3D G_N_ELEMENTS(hw_compat_7_0); =20 diff --git a/migration/migration.c b/migration/migration.c index 31739b2af9..3f79df0b70 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -2540,6 +2540,13 @@ bool migrate_use_multifd(void) return s->enabled_capabilities[MIGRATION_CAPABILITY_MULTIFD]; } =20 +bool migrate_multifd_sync_each_iteration(void) +{ + MigrationState *s =3D migrate_get_current(); + + return s->multifd_sync_each_iteration; +} + bool migrate_pause_before_switchover(void) { MigrationState *s; @@ -4274,6 +4281,9 @@ static Property migration_properties[] =3D { DEFINE_PROP_SIZE("announce-step", MigrationState, parameters.announce_step, 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), =20 /* Migration capabilities */ DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), --=20 2.34.1