From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A3B82C7EE25 for ; Thu, 27 Apr 2023 15:27:27 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ps3Wh-0001ZN-Av; Thu, 27 Apr 2023 11:27:19 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ps3WY-0001Nl-Ci for qemu-devel@nongnu.org; Thu, 27 Apr 2023 11:27:12 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ps3WW-0000yM-0n for qemu-devel@nongnu.org; Thu, 27 Apr 2023 11:27:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1682609221; 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=dy1LT4y8A/6RjhKEZRZXKNwPiEwkx5zgEeXLHA5wj5w=; b=Cl1FaXcsT3Rtur5lyv9dyGP+4RtTvu1gG/PZD9bjKYecLYosDFXtKP2VnBwbSgLejqMwJG jWS+PKvjf+brbeHgi/m1TvZccUdDRnbK1HBllb5ODBAeeEQl9mQ0vLqL22VB2PHVIUMCY1 dV9XqPeYh7yF+1uJwmcjhIheTcbgZUw= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-384-XvNiFx8gPpOQ-TY2OzLorA-1; Thu, 27 Apr 2023 11:26:04 -0400 X-MC-Unique: XvNiFx8gPpOQ-TY2OzLorA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 3903F38294DB; Thu, 27 Apr 2023 15:23:22 +0000 (UTC) Received: from secure.mitica (unknown [10.39.193.238]) by smtp.corp.redhat.com (Postfix) with ESMTP id C2B5940C201F; Thu, 27 Apr 2023 15:23:19 +0000 (UTC) From: Juan Quintela To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, Marcel Apfelbaum , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Eric Blake , Juan Quintela , Peter Xu , John Snow , Yanan Wang , Stefan Hajnoczi , Leonardo Bras , Fam Zheng , Eduardo Habkost , Vladimir Sementsov-Ogievskiy Subject: [PULL 15/18] multifd: Only flush once each full round of memory Date: Thu, 27 Apr 2023 17:22:31 +0200 Message-Id: <20230427152234.25400-16-quintela@redhat.com> In-Reply-To: <20230427152234.25400-1-quintela@redhat.com> References: <20230427152234.25400-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 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: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.171, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org We need to add a new flag to mean to flush at that point. Notice that we still flush at the end of setup and at the end of complete stages. Signed-off-by: Juan Quintela Acked-by: Peter Xu --- Add missing qemu_fflush(), now it passes all tests always. In the previous version, the check that changes the default value to false got lost in some rebase. Get it back. --- migration/migration.h | 3 +-- migration/options.c | 8 ++------ migration/ram.c | 28 +++++++++++++++++++++++++++- 3 files changed, 30 insertions(+), 9 deletions(-) diff --git a/migration/migration.h b/migration/migration.h index e2247d708f..3a918514e7 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -412,8 +412,7 @@ struct MigrationState { * only need to do this flush after we have go through all the * dirty pages. For historical reasons, we do that after each * section. This is suboptimal (we flush too many times). - * Default value is false. Setting this property has no effect - * until the patch that removes this comment. (since 8.1) + * Default value is false. (since 8.1) */ bool multifd_flush_after_each_section; /* diff --git a/migration/options.c b/migration/options.c index 690c8f718e..53b7fc5d5d 100644 --- a/migration/options.c +++ b/migration/options.c @@ -89,7 +89,7 @@ Property migration_properties[] = { DEFINE_PROP_BOOL("decompress-error-check", MigrationState, decompress_error_check, true), DEFINE_PROP_BOOL("multifd-flush-after-each-section", MigrationState, - multifd_flush_after_each_section, true), + multifd_flush_after_each_section, false), DEFINE_PROP_UINT8("x-clear-bitmap-shift", MigrationState, clear_bitmap_shift, CLEAR_BITMAP_SHIFT_DEFAULT), DEFINE_PROP_BOOL("x-preempt-pre-7-2", MigrationState, @@ -341,11 +341,7 @@ bool migrate_multifd_flush_after_each_section(void) { MigrationState *s = migrate_get_current(); - /* - * Until the patch that remove this comment, we always return that - * the property is enabled. - */ - return true || s->multifd_flush_after_each_section; + return s->multifd_flush_after_each_section; } bool migrate_postcopy(void) diff --git a/migration/ram.c b/migration/ram.c index 1e2414d681..e9dcda8b9d 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -86,6 +86,7 @@ #define RAM_SAVE_FLAG_XBZRLE 0x40 /* 0x80 is reserved in qemu-file.h for RAM_SAVE_FLAG_HOOK */ #define RAM_SAVE_FLAG_COMPRESS_PAGE 0x100 +#define RAM_SAVE_FLAG_MULTIFD_FLUSH 0x200 /* We can't use any flag that is bigger than 0x200 */ int (*xbzrle_encode_buffer_func)(uint8_t *, uint8_t *, int, @@ -1581,6 +1582,7 @@ 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 @@ -1608,6 +1610,15 @@ static int find_dirty_block(RAMState *rs, PageSearchStatus *pss) pss->page = 0; pss->block = QLIST_NEXT_RCU(pss->block, next); if (!pss->block) { + if (!migrate_multifd_flush_after_each_section()) { + QEMUFile *f = rs->pss[RAM_CHANNEL_PRECOPY].pss_channel; + int ret = multifd_send_sync_main(f); + if (ret < 0) { + return ret; + } + qemu_put_be64(f, RAM_SAVE_FLAG_MULTIFD_FLUSH); + qemu_fflush(f); + } /* * If memory migration starts over, we will meet a dirtied page * which may still exists in compression threads's ring, so we @@ -2600,6 +2611,9 @@ static int ram_find_and_save_block(RAMState *rs) break; } else if (res == PAGE_TRY_AGAIN) { continue; + } else if (res < 0) { + pages = res; + break; } } } @@ -3286,6 +3300,10 @@ static int ram_save_setup(QEMUFile *f, void *opaque) return ret; } + if (!migrate_multifd_flush_after_each_section()) { + qemu_put_be64(f, RAM_SAVE_FLAG_MULTIFD_FLUSH); + } + qemu_put_be64(f, RAM_SAVE_FLAG_EOS); qemu_fflush(f); @@ -3471,6 +3489,9 @@ static int ram_save_complete(QEMUFile *f, void *opaque) return ret; } + if (!migrate_multifd_flush_after_each_section()) { + qemu_put_be64(f, RAM_SAVE_FLAG_MULTIFD_FLUSH); + } qemu_put_be64(f, RAM_SAVE_FLAG_EOS); qemu_fflush(f); @@ -4152,7 +4173,9 @@ int ram_load_postcopy(QEMUFile *f, int channel) } decompress_data_with_multi_threads(f, page_buffer, len); break; - + case RAM_SAVE_FLAG_MULTIFD_FLUSH: + multifd_recv_sync_main(); + break; case RAM_SAVE_FLAG_EOS: /* normal exit */ if (migrate_multifd_flush_after_each_section()) { @@ -4426,6 +4449,9 @@ static int ram_load_precopy(QEMUFile *f) break; } break; + case RAM_SAVE_FLAG_MULTIFD_FLUSH: + multifd_recv_sync_main(); + break; case RAM_SAVE_FLAG_EOS: /* normal exit */ if (migrate_multifd_flush_after_each_section()) { -- 2.40.0