From patchwork Thu Oct 25 14:46:41 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emilio Cota X-Patchwork-Id: 10655941 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 153B813B5 for ; Thu, 25 Oct 2018 15:03:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F3DF82BA60 for ; Thu, 25 Oct 2018 15:03:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E535C2BA8C; Thu, 25 Oct 2018 15:03:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 58F062BA60 for ; Thu, 25 Oct 2018 15:03:17 +0000 (UTC) Received: from localhost ([::1]:55041 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gFhAK-00083G-KI for patchwork-qemu-devel@patchwork.kernel.org; Thu, 25 Oct 2018 11:03:16 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60142) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gFh5J-0003ub-AJ for qemu-devel@nongnu.org; Thu, 25 Oct 2018 10:58:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gFgvP-0008Pn-KP for qemu-devel@nongnu.org; Thu, 25 Oct 2018 10:47:52 -0400 Received: from out3-smtp.messagingengine.com ([66.111.4.27]:57789) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gFgvP-0008Bt-AG for qemu-devel@nongnu.org; Thu, 25 Oct 2018 10:47:51 -0400 Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailout.nyi.internal (Postfix) with ESMTP id C97FA221E2; Thu, 25 Oct 2018 10:47:06 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute4.internal (MEProxy); Thu, 25 Oct 2018 10:47:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=braap.org; h= from:to:cc:subject:date:message-id:in-reply-to:references; s= mesmtp; bh=PFmou4IxVyaAZsp/mAKDP2dcxcauquq0LkdpbM8yqi0=; b=GulST NlTUK566QCL7B48qev7dEaPwvg2b3h9luMZccT9N5Vp2YQcXBUG3ZEvUyDZK6jKj Nj0O+XlwxfQkDQPDI9sQOw+SqBg4gLv0a1FrnNuRFP5aUxyu3Wflud4d04jfO5OY FQ+WUeRlsJYRslCrMu3thwOgbky37rF4II+qvE= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:date:from:in-reply-to:message-id :references:subject:to:x-me-proxy:x-me-proxy:x-me-sender :x-me-sender:x-sasl-enc; s=fm1; bh=PFmou4IxVyaAZsp/mAKDP2dcxcauq uq0LkdpbM8yqi0=; b=OgwCpmbQOTjhVQ7vQNRthYJTnsR2zkbY9sDY82hHv/hAG h6P3yLqmDJke2XVuEqOsbfrWH+l7dG+z9kd5WESHp2NQYLuMqR9lD0VabVyi2Xon JxBCikZXvB9gGJRrBxOMoJ4NPaJiSigh64eCJSKGIBvFvIEM1GQMkj2/M3Iq5Bph 3uzVFPALCuqVEF92q5yV6Bh6QEUpFwkt/aho9MxMeN+RDeGBMISoeBTtOM2TaMz3 pdovSNLEOT9VHgisQp7FIPUIT0rhHorgVkdoufOpvQJDD/FwYnA5uEtFfnAH/FQt kmEQ1k6eDO2ODD5FE41se0V0hAfUmwZTjQ7jtfrgQ== X-ME-Sender: X-ME-Proxy: Received: from localhost (flamenco.cs.columbia.edu [128.59.20.216]) by mail.messagingengine.com (Postfix) with ESMTPA id 79309E421C; Thu, 25 Oct 2018 10:47:06 -0400 (EDT) From: "Emilio G. Cota" To: qemu-devel@nongnu.org Date: Thu, 25 Oct 2018 10:46:41 -0400 Message-Id: <20181025144644.15464-68-cota@braap.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181025144644.15464-1-cota@braap.org> References: <20181025144644.15464-1-cota@braap.org> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 66.111.4.27 Subject: [Qemu-devel] [RFC v4 68/71] cpu: add async_run_on_cpu_no_bql X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Some async jobs do not need the BQL. Signed-off-by: Emilio G. Cota Reviewed-by: Richard Henderson --- include/qom/cpu.h | 14 ++++++++++++++ cpus-common.c | 39 ++++++++++++++++++++++++++++++++++----- 2 files changed, 48 insertions(+), 5 deletions(-) diff --git a/include/qom/cpu.h b/include/qom/cpu.h index ed68e089c5..0e90d9d093 100644 --- a/include/qom/cpu.h +++ b/include/qom/cpu.h @@ -882,9 +882,23 @@ void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data); * @data: Data to pass to the function. * * Schedules the function @func for execution on the vCPU @cpu asynchronously. + * See also: async_run_on_cpu_no_bql() */ void async_run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data); +/** + * async_run_on_cpu_no_bql: + * @cpu: The vCPU to run on. + * @func: The function to be executed. + * @data: Data to pass to the function. + * + * Schedules the function @func for execution on the vCPU @cpu asynchronously. + * This function is run outside the BQL. + * See also: async_run_on_cpu() + */ +void async_run_on_cpu_no_bql(CPUState *cpu, run_on_cpu_func func, + run_on_cpu_data data); + /** * async_safe_run_on_cpu: * @cpu: The vCPU to run on. diff --git a/cpus-common.c b/cpus-common.c index 80d7e300eb..232cb12c46 100644 --- a/cpus-common.c +++ b/cpus-common.c @@ -109,6 +109,7 @@ struct qemu_work_item { run_on_cpu_func func; run_on_cpu_data data; bool free, exclusive, done; + bool bql; }; /* Called with the CPU's lock held */ @@ -155,6 +156,7 @@ void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data) wi.done = false; wi.free = false; wi.exclusive = false; + wi.bql = true; cpu_mutex_lock(cpu); queue_work_on_cpu_locked(cpu, &wi); @@ -179,6 +181,21 @@ void async_run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data) wi->func = func; wi->data = data; wi->free = true; + wi->bql = true; + + queue_work_on_cpu(cpu, wi); +} + +void async_run_on_cpu_no_bql(CPUState *cpu, run_on_cpu_func func, + run_on_cpu_data data) +{ + struct qemu_work_item *wi; + + wi = g_malloc0(sizeof(struct qemu_work_item)); + wi->func = func; + wi->data = data; + wi->free = true; + /* wi->bql initialized to false */ queue_work_on_cpu(cpu, wi); } @@ -323,6 +340,7 @@ void async_safe_run_on_cpu(CPUState *cpu, run_on_cpu_func func, wi->data = data; wi->free = true; wi->exclusive = true; + /* wi->bql initialized to false */ queue_work_on_cpu(cpu, wi); } @@ -347,6 +365,7 @@ static void process_queued_cpu_work_locked(CPUState *cpu) * BQL, so it goes to sleep; start_exclusive() is sleeping too, so * neither CPU can proceed. */ + g_assert(!wi->bql); if (has_bql) { qemu_mutex_unlock_iothread(); } @@ -357,12 +376,22 @@ static void process_queued_cpu_work_locked(CPUState *cpu) qemu_mutex_lock_iothread(); } } else { - if (has_bql) { - wi->func(cpu, wi->data); + if (wi->bql) { + if (has_bql) { + wi->func(cpu, wi->data); + } else { + qemu_mutex_lock_iothread(); + wi->func(cpu, wi->data); + qemu_mutex_unlock_iothread(); + } } else { - qemu_mutex_lock_iothread(); - wi->func(cpu, wi->data); - qemu_mutex_unlock_iothread(); + if (has_bql) { + qemu_mutex_unlock_iothread(); + wi->func(cpu, wi->data); + qemu_mutex_lock_iothread(); + } else { + wi->func(cpu, wi->data); + } } } cpu_mutex_lock(cpu);