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bh=uJg/WFGZVTtU9gkUoEDGA71eYp5/Sv32u/ewLvjUnxA=; b=Otm7FdKMfM4cJ1HftubTqkn9uTyCg/ehjnGS8laaQ0EjxRr56jDxPaUbjVgCvH3ib640FO ZWLqVz3i6bYwsLdOqnc/dxreSzT+0hnvvSiIX++UIDKqJtGX84C2vlUvAEoMSDpLUXab4X eqyjA07WbubkELqLGOC9e0bEwcP7xqc= X-MC-Unique: vGX8YB88O_CZ-pbxGFXSAQ-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 5/5] multifd: Only sync once each full round of memory Date: Tue, 21 Jun 2022 16:05:07 +0200 Message-Id: <20220621140507.1246-6-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=170.10.129.124; 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: 1655820720156100001 Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Dr. David Alan Gilbert --- 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[] =3D { 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), =20 /* 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 =20 XBZRLECacheStats xbzrle_counters; =20 @@ -1482,6 +1483,7 @@ retry: * associated with the search process. * * Returns: + * <0: An error happened * 0: no page found, give up * 1: no page found, retry * 2: page found @@ -1510,6 +1512,13 @@ static int find_dirty_block(RAMState *rs, PageSearch= Status *pss) pss->page =3D 0; pss->block =3D QLIST_NEXT_RCU(pss->block, next); if (!pss->block) { + if (!migrate_multifd_sync_each_iteration()) { + int ret =3D multifd_send_sync_main(rs->f); + if (ret < 0) { + return ret; + } + qemu_put_be64(rs->f, RAM_SAVE_FLAG_MULTIFD_SYNC); + } /* * If memory migration starts over, we will meet a dirtied page * which may still exists in compression threads's ring, so we @@ -2273,7 +2282,8 @@ static int ram_find_and_save_block(RAMState *rs) if (!get_queued_page(rs, &pss)) { /* priority queue empty, so just search for something dirty */ int res =3D find_dirty_block(rs, &pss); - if (res =3D=3D 0) { + if (res <=3D 0) { + pages =3D res; break; } else if (res =3D=3D 1) continue; @@ -2943,11 +2953,13 @@ static int ram_save_setup(QEMUFile *f, void *opaque) ram_control_before_iterate(f, RAM_CONTROL_SETUP); ram_control_after_iterate(f, RAM_CONTROL_SETUP); =20 - if (migrate_multifd_sync_each_iteration()) { - ret =3D multifd_send_sync_main(f); - if (ret < 0) { - return ret; - } + ret =3D multifd_send_sync_main(f); + if (ret < 0) { + return ret; + } + + if (!migrate_multifd_sync_each_iteration()) { + qemu_put_be64(f, RAM_SAVE_FLAG_MULTIFD_SYNC); } qemu_put_be64(f, RAM_SAVE_FLAG_EOS); qemu_fflush(f); @@ -3127,13 +3139,14 @@ static int ram_save_complete(QEMUFile *f, void *opa= que) return ret; } =20 - if (migrate_multifd_sync_each_iteration()) { - ret =3D multifd_send_sync_main(rs->f); - if (ret < 0) { - return ret; - } + ret =3D multifd_send_sync_main(rs->f); + if (ret < 0) { + return ret; } =20 + if (migrate_multifd_sync_each_iteration()) { + qemu_put_be64(f, RAM_SAVE_FLAG_MULTIFD_SYNC); + } qemu_put_be64(f, RAM_SAVE_FLAG_EOS); qemu_fflush(f); =20 @@ -3800,7 +3813,9 @@ int ram_load_postcopy(QEMUFile *f) } decompress_data_with_multi_threads(f, page_buffer, len); break; - + case RAM_SAVE_FLAG_MULTIFD_SYNC: + multifd_recv_sync_main(); + break; case RAM_SAVE_FLAG_EOS: /* normal exit */ if (migrate_multifd_sync_each_iteration()) { @@ -4079,6 +4094,9 @@ static int ram_load_precopy(QEMUFile *f) break; } break; + case RAM_SAVE_FLAG_MULTIFD_SYNC: + multifd_recv_sync_main(); + break; case RAM_SAVE_FLAG_EOS: /* normal exit */ if (migrate_multifd_sync_each_iteration()) { --=20 2.34.1