From patchwork Thu Feb 8 03:04:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Xu X-Patchwork-Id: 1896406 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=bGD6v8Di; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4TVhk81BxKz23g7 for ; Thu, 8 Feb 2024 14:07:44 +1100 (AEDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rXujf-00068W-02; Wed, 07 Feb 2024 22:05:59 -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 1rXujT-0005xj-4X for qemu-devel@nongnu.org; Wed, 07 Feb 2024 22:05:47 -0500 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 1rXujR-0004J5-HS for qemu-devel@nongnu.org; Wed, 07 Feb 2024 22:05:46 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1707361544; 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=nDtOh6EyR1FRlMPetryL8BQxGR+uScxl+Gq8KTSlZg4=; b=bGD6v8DiXL7n0p9AElbLtfCpE9VfmKpCRo1/56s/4+QfTkSeBACxyTbfTrxOze6K6QXJRF ojBsn1jkZV+SBc9HuBAF7HhSaz+RL6WLN7SmCjYvH09NfsAhu+qXnCfL7Gg5kFjCEGjqZp C7tj5RIZo+we8EpI8/REyNT7UYAnsjo= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-638-ML1HRWBwNECzr6qH0ZDDdg-1; Wed, 07 Feb 2024 22:05:42 -0500 X-MC-Unique: ML1HRWBwNECzr6qH0ZDDdg-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (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 6D5E2870821; Thu, 8 Feb 2024 03:05:42 +0000 (UTC) Received: from x1n.redhat.com (unknown [10.72.116.45]) by smtp.corp.redhat.com (Postfix) with ESMTP id 23B08492BC7; Thu, 8 Feb 2024 03:05:39 +0000 (UTC) From: peterx@redhat.com To: Peter Maydell , qemu-devel@nongnu.org Cc: peterx@redhat.com, Fabiano Rosas Subject: [PULL 03/34] migration/multifd: multifd_send_kick_main() Date: Thu, 8 Feb 2024 11:04:57 +0800 Message-ID: <20240208030528.368214-4-peterx@redhat.com> In-Reply-To: <20240208030528.368214-1-peterx@redhat.com> References: <20240208030528.368214-1-peterx@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 Received-SPF: pass client-ip=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.106, 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_H5=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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Peter Xu When a multifd sender thread hit errors, it always needs to kick the main thread by kicking all the semaphores that it can be waiting upon. Provide a helper for it and deduplicate the code. Reviewed-by: Fabiano Rosas Link: https://lore.kernel.org/r/20240202102857.110210-3-peterx@redhat.com Signed-off-by: Peter Xu --- migration/multifd.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/migration/multifd.c b/migration/multifd.c index eee2586770..b8d2c96533 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -372,6 +372,18 @@ struct { MultiFDMethods *ops; } *multifd_send_state; +/* + * The migration thread can wait on either of the two semaphores. This + * function can be used to kick the main thread out of waiting on either of + * them. Should mostly only be called when something wrong happened with + * the current multifd send thread. + */ +static void multifd_send_kick_main(MultiFDSendParams *p) +{ + qemu_sem_post(&p->sem_sync); + qemu_sem_post(&multifd_send_state->channels_ready); +} + /* * How we use multifd_send_state->pages and channel->pages? * @@ -739,8 +751,7 @@ out: assert(local_err); trace_multifd_send_error(p->id); multifd_send_terminate_threads(local_err); - qemu_sem_post(&p->sem_sync); - qemu_sem_post(&multifd_send_state->channels_ready); + multifd_send_kick_main(p); error_free(local_err); } @@ -781,8 +792,7 @@ static void multifd_tls_outgoing_handshake(QIOTask *task, * is not created, and then tell who pay attention to me. */ p->quit = true; - qemu_sem_post(&multifd_send_state->channels_ready); - qemu_sem_post(&p->sem_sync); + multifd_send_kick_main(p); error_free(err); } @@ -852,8 +862,7 @@ static void multifd_new_send_channel_cleanup(MultiFDSendParams *p, { migrate_set_error(migrate_get_current(), err); /* Error happen, we need to tell who pay attention to me */ - qemu_sem_post(&multifd_send_state->channels_ready); - qemu_sem_post(&p->sem_sync); + multifd_send_kick_main(p); /* * Although multifd_send_thread is not created, but main migration * thread need to judge whether it is running, so we need to mark