From patchwork Wed Jan 31 10:30:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Xu X-Patchwork-Id: 13539144 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 8E40BC47DDF for ; Wed, 31 Jan 2024 10:33:32 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rV7sU-00054y-58; Wed, 31 Jan 2024 05:31:34 -0500 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 1rV7sQ-00052L-FH for qemu-devel@nongnu.org; Wed, 31 Jan 2024 05:31:31 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rV7sO-0005Zy-3A for qemu-devel@nongnu.org; Wed, 31 Jan 2024 05:31:29 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1706697087; 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=qzb46DUZSTMJoNeVIqZsw/shF+U8HEgAIFp5xpwtBDY=; b=FpMSR3jH7HLKvU/LPpw9tU+RUi0hjc4ignY0D2Uc52fINLzO29W08LRmGrr66R45rA7L+g KENISHYf64qmf6RWPYAF83OH4xs6LW3euEFLFDYJ8QDynVQPy+XKEwMLDx1wX7TIow1pqL dy3rV82Vs7/Dzi8y10Su6mOirTRvQQE= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-461-B2wYEq4VNMWf3OzQbJOBHA-1; Wed, 31 Jan 2024 05:31:23 -0500 X-MC-Unique: B2wYEq4VNMWf3OzQbJOBHA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 379861C068D3; Wed, 31 Jan 2024 10:31:23 +0000 (UTC) Received: from x1n.redhat.com (unknown [10.72.116.11]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3695D1BDB1; Wed, 31 Jan 2024 10:31:18 +0000 (UTC) From: peterx@redhat.com To: qemu-devel@nongnu.org Cc: Bryan Zhang , Prasad Pandit , Fabiano Rosas , peterx@redhat.com, Yuan Liu , Avihai Horon , Hao Xiang Subject: [PATCH 01/14] migration/multifd: Drop stale comment for multifd zero copy Date: Wed, 31 Jan 2024 18:30:58 +0800 Message-ID: <20240131103111.306523-2-peterx@redhat.com> In-Reply-To: <20240131103111.306523-1-peterx@redhat.com> References: <20240131103111.306523-1-peterx@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 Received-SPF: pass client-ip=170.10.129.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.292, 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Peter Xu We've already done that with multifd_flush_after_each_section, for multifd in general. Drop the stale "TODO-like" comment. Reviewed-by: Fabiano Rosas Signed-off-by: Peter Xu --- migration/multifd.c | 11 ----------- 1 file changed, 11 deletions(-) diff --git a/migration/multifd.c b/migration/multifd.c index 25cbc6dc6b..eee2586770 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -598,17 +598,6 @@ int multifd_send_sync_main(void) } } - /* - * When using zero-copy, it's necessary to flush the pages before any of - * the pages can be sent again, so we'll make sure the new version of the - * pages will always arrive _later_ than the old pages. - * - * Currently we achieve this by flushing the zero-page requested writes - * per ram iteration, but in the future we could potentially optimize it - * to be less frequent, e.g. only after we finished one whole scanning of - * all the dirty bitmaps. - */ - flush_zero_copy = migrate_zero_copy_send(); for (i = 0; i < migrate_multifd_channels(); i++) {