From patchwork Fri May 5 11:33:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liu Jian X-Patchwork-Id: 13232466 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61670C77B7F for ; Fri, 5 May 2023 11:24:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231864AbjEELYd (ORCPT ); Fri, 5 May 2023 07:24:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33646 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231637AbjEELYc (ORCPT ); Fri, 5 May 2023 07:24:32 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F03F1A498; Fri, 5 May 2023 04:24:31 -0700 (PDT) Received: from canpemm500010.china.huawei.com (unknown [172.30.72.53]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4QCSrt3jlczTjxM; Fri, 5 May 2023 19:19:58 +0800 (CST) Received: from huawei.com (10.175.101.6) by canpemm500010.china.huawei.com (7.192.105.118) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Fri, 5 May 2023 19:24:28 +0800 From: Liu Jian To: , , , , , , , , , , , , , , , , , , , , CC: , , , , Subject: [PATCH 4/9] softirq: Allow early break Date: Fri, 5 May 2023 19:33:10 +0800 Message-ID: <20230505113315.3307723-5-liujian56@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230505113315.3307723-1-liujian56@huawei.com> References: <20230505113315.3307723-1-liujian56@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To canpemm500010.china.huawei.com (7.192.105.118) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: Peter Zijlstra Allow terminating the softirq processing loop without finishing the vectors. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Liu Jian --- kernel/softirq.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/kernel/softirq.c b/kernel/softirq.c index 48a81d8ae49a..e2cad5d108c8 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -582,6 +582,9 @@ asmlinkage __visible void __softirq_entry __do_softirq(void) prev_count, preempt_count()); preempt_count_set(prev_count); } + + if (pending && __softirq_needs_break(start)) + break; } if (!IS_ENABLED(CONFIG_PREEMPT_RT) && @@ -590,13 +593,14 @@ asmlinkage __visible void __softirq_entry __do_softirq(void) local_irq_disable(); - pending = local_softirq_pending(); - if (pending) { - if (!__softirq_needs_break(start) && --max_restart) - goto restart; + if (pending) + or_softirq_pending(pending); + else if ((pending = local_softirq_pending()) && + !__softirq_needs_break(start) && + --max_restart) + goto restart; - wakeup_softirqd(); - } + wakeup_softirqd(); account_softirq_exit(current); lockdep_softirq_end(in_hardirq);