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 22B09C54EAA for ; Mon, 30 Jan 2023 08:11:26 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pMPFK-0000rC-Pm; Mon, 30 Jan 2023 03:10:34 -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 1pMPFE-0000l6-Hp for qemu-devel@nongnu.org; Mon, 30 Jan 2023 03:10:33 -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 1pMPFD-0002J9-2O for qemu-devel@nongnu.org; Mon, 30 Jan 2023 03:10:28 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1675066226; 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=jsrXu9wL6HcpTtqw1FtRK4iQ5uaKV2xOq9pWRRptEL8=; b=CzmQQrkKgHDHN3U7qZDSzB+sXYHDj4UCiMIRPFp7mAtQyBI0sTGtWOb87vzFwaWUacT7TO 42WncNale9q6hnnGSom3OqeG+cFUJ7fSfLSvHnxpQuvfQmG/5/FEQCnsy6ZAh46kAYNVn1 MyAi2UIZXuLMQxhWKKXBRKuIjHQIIAM= 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-457-j1CYt137MTmZ5Tzto6LhuQ-1; Mon, 30 Jan 2023 03:10:23 -0500 X-MC-Unique: j1CYt137MTmZ5Tzto6LhuQ-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 8ADC32A5955C; Mon, 30 Jan 2023 08:10:22 +0000 (UTC) Received: from secure.mitica (unknown [10.39.192.57]) by smtp.corp.redhat.com (Postfix) with ESMTP id C319140C2064; Mon, 30 Jan 2023 08:10:15 +0000 (UTC) From: Juan Quintela To: qemu-devel@nongnu.org Cc: Juan Quintela , Marcel Apfelbaum , Yanan Wang , Markus Armbruster , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , "Dr. David Alan Gilbert" , Eduardo Habkost , Eric Blake Subject: [PATCH v2 07/11] multifd: Prepare to send a packet without the mutex held Date: Mon, 30 Jan 2023 09:09:52 +0100 Message-Id: <20230130080956.3047-8-quintela@redhat.com> In-Reply-To: <20230130080956.3047-1-quintela@redhat.com> References: <20230130080956.3047-1-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=170.10.129.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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 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 We do the send_prepare() and the fill of the head packet without the mutex held. It will help a lot for compression and later in the series for zero pages. Notice that we can use p->pages without holding p->mutex because p->pending_job == 1. Signed-off-by: Juan Quintela --- migration/multifd.h | 2 ++ migration/multifd.c | 12 ++++++------ 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/migration/multifd.h b/migration/multifd.h index a67cefc0a2..cd389d18d2 100644 --- a/migration/multifd.h +++ b/migration/multifd.h @@ -109,7 +109,9 @@ typedef struct { /* array of pages to sent. * The owner of 'pages' depends of 'pending_job' value: * pending_job == 0 -> migration_thread can use it. + * No need for mutex lock. * pending_job != 0 -> multifd_channel can use it. + * No need for mutex lock. */ MultiFDPages_t *pages; diff --git a/migration/multifd.c b/migration/multifd.c index 77196a55b4..7ebaca6e55 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -672,6 +672,8 @@ static void *multifd_send_thread(void *opaque) p->flags |= MULTIFD_FLAG_SYNC; p->sync_needed = false; } + qemu_mutex_unlock(&p->mutex); + p->normal_num = 0; if (use_zero_copy_send) { @@ -688,16 +690,10 @@ static void *multifd_send_thread(void *opaque) if (p->normal_num) { ret = multifd_send_state->ops->send_prepare(p, &local_err); if (ret != 0) { - qemu_mutex_unlock(&p->mutex); break; } } multifd_send_fill_packet(p); - p->num_packets++; - p->total_normal_pages += p->normal_num; - p->pages->num = 0; - p->pages->block = NULL; - qemu_mutex_unlock(&p->mutex); trace_multifd_send(p->id, packet_num, p->normal_num, p->flags, p->next_packet_size); @@ -722,6 +718,10 @@ static void *multifd_send_thread(void *opaque) } qemu_mutex_lock(&p->mutex); + p->num_packets++; + p->total_normal_pages += p->normal_num; + p->pages->num = 0; + p->pages->block = NULL; p->sent_bytes += p->packet_len; p->sent_bytes += p->next_packet_size; p->pending_job--; -- 2.39.1