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Thu, 28 Jul 2022 08:00:18 -0400 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-665-6E4Jy28mNCSdoVZ_IESdOw-1; Thu, 28 Jul 2022 08:00:11 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7DECF811E76; Thu, 28 Jul 2022 12:00:10 +0000 (UTC) Received: from secure.mitica (unknown [10.39.192.136]) by smtp.corp.redhat.com (Postfix) with ESMTP id F1BF594561; Thu, 28 Jul 2022 12:00:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1659009616; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fuYKXod9meK5/3kuBVMs3EAPF/cb5AdSc/xEpwKg5J0=; b=OlHOykj+Nwiv61g5N7cc6fKJ1fzw9WYFZhxohIHgD49h77eP8K1XRV1RTDVVq1Ac2T1Dz6 V+7tqkBx6lnEroZ+6S3dkD7bhOs/AMgz7oorKz7fK6/TzWXWkethYJTDFkNvaMg/WXABiO WGnZTTB2kRxjaqDfSnt/xPt8fwotxoU= X-MC-Unique: 6E4Jy28mNCSdoVZ_IESdOw-1 From: Juan Quintela To: qemu-devel@nongnu.org Cc: Marcel Apfelbaum , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Juan Quintela , "Dr. David Alan Gilbert" , Eduardo Habkost , Yanan Wang Subject: [PATCH v2 5/6] multifd: Only sync once each full round of memory Date: Thu, 28 Jul 2022 13:59:56 +0200 Message-Id: <20220728115957.5554-6-quintela@redhat.com> In-Reply-To: <20220728115957.5554-1-quintela@redhat.com> References: <20220728115957.5554-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 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: 1659010110659100001 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 --- Add missing qemu_fflush(), now it passes all tests always. --- migration/migration.c | 2 +- migration/ram.c | 27 ++++++++++++++++++++++++++- 2 files changed, 27 insertions(+), 2 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index ebca4f2d8a..7905145d7d 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -4393,7 +4393,7 @@ static Property migration_properties[] =3D { DEFINE_PROP_STRING("tls-authz", MigrationState, parameters.tls_authz), /* We will change to false when we introduce the new mechanism */ DEFINE_PROP_BOOL("multifd-sync-after-each-section", MigrationState, - multifd_sync_after_each_section, true), + multifd_sync_after_each_section, false), /* Migration capabilities */ DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_AL= L), diff --git a/migration/ram.c b/migration/ram.c index 1507ba1991..234603ee4f 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -82,6 +82,7 @@ #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 @@ -1540,6 +1541,7 @@ retry: * associated with the search process. * * Returns: + * <0: An error happened * PAGE_ALL_CLEAN: no dirty page found, give up * PAGE_TRY_AGAIN: no dirty page found, retry for next block * PAGE_DIRTY_FOUND: dirty page found @@ -1572,6 +1574,14 @@ 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_after_each_section()) { + int ret =3D multifd_send_sync_main(rs->f); + if (ret < 0) { + return ret; + } + qemu_put_be64(rs->f, RAM_SAVE_FLAG_MULTIFD_SYNC); + qemu_fflush(rs->f); + } /* * If memory migration starts over, we will meet a dirtied page * which may still exists in compression threads's ring, so we @@ -2556,6 +2566,9 @@ static int ram_find_and_save_block(RAMState *rs) break; } else if (res =3D=3D PAGE_TRY_AGAIN) { continue; + } else if (res < 0) { + pages =3D res; + break; } } } @@ -3232,6 +3245,10 @@ static int ram_save_setup(QEMUFile *f, void *opaque) return ret; } =20 + if (!migrate_multifd_sync_after_each_section()) { + qemu_put_be64(f, RAM_SAVE_FLAG_MULTIFD_SYNC); + } + qemu_put_be64(f, RAM_SAVE_FLAG_EOS); qemu_fflush(f); =20 @@ -3419,6 +3436,9 @@ static int ram_save_complete(QEMUFile *f, void *opaqu= e) return ret; } =20 + if (!migrate_multifd_sync_after_each_section()) { + qemu_put_be64(f, RAM_SAVE_FLAG_MULTIFD_SYNC); + } qemu_put_be64(f, RAM_SAVE_FLAG_EOS); qemu_fflush(f); =20 @@ -4087,7 +4107,9 @@ int ram_load_postcopy(QEMUFile *f, int channel) } 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_after_each_section()) { @@ -4367,6 +4389,9 @@ 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_after_each_section()) { --=20 2.37.1