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 X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3539DC433E6 for ; Mon, 31 Aug 2020 18:08:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0998020866 for ; Mon, 31 Aug 2020 18:08:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598897287; bh=aMf8/AiYFYSLrVdWssiu4XGuFOl8wGjwU1yeTOTTWr0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FGh0pCctY3NYQGUHhffZivy/T03zGqn5fzepvCLXtk2xE+kUOFkBFRy8smRfkLrfO Z7YPIoB7f1WnJMgE2zY0QTf8dAa6AC1IheffLMQ+Co0K6T72A1Ub9fE36WoMPC0cZ9 NgVfwwFlLC5RN5s6zjZPyq64E4HODRfahbkmel6E= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729413AbgHaSIG (ORCPT ); Mon, 31 Aug 2020 14:08:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:55374 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729314AbgHaSH6 (ORCPT ); Mon, 31 Aug 2020 14:07:58 -0400 Received: from paulmck-ThinkPad-P72.home (unknown [50.45.173.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 858B62176B; Mon, 31 Aug 2020 18:07:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598897275; bh=aMf8/AiYFYSLrVdWssiu4XGuFOl8wGjwU1yeTOTTWr0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mBQ9LEqvA4AgAcyC3bC96HbtfJ8mIMb68CRwZ+i5pDF9CjkWqLzkDtJmKxdTPCx6G def7ef8w9gMNny/C/w4UJ+d1J5sxX5fGKe3y4IHK4wP6vZOEJFNE8L9p4dYYA6pI2b X6geUy05VtTQJWH/ogleE9NpsrujMB/UIumhQB1g= From: paulmck@kernel.org To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, "Paul E. McKenney" Subject: [PATCH tip/core/rcu 18/19] scftorture: Add cond_resched() to test loop Date: Mon, 31 Aug 2020 11:07:48 -0700 Message-Id: <20200831180749.843-18-paulmck@kernel.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20200831180731.GA582@paulmck-ThinkPad-P72> References: <20200831180731.GA582@paulmck-ThinkPad-P72> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Paul E. McKenney" Although the test loop does randomly delay, which would provide quiescent states and so forth, it is possible for there to be a series of long smp_call_function*() handler runtimes with no delays, which results in softlockup and RCU CPU stall warning messages. This commit therefore inserts a cond_resched() into the main test loop. Signed-off-by: Paul E. McKenney --- kernel/scftorture.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/scftorture.c b/kernel/scftorture.c index fc22bcc..554a521 100644 --- a/kernel/scftorture.c +++ b/kernel/scftorture.c @@ -420,6 +420,7 @@ static int scftorture_invoker(void *arg) set_cpus_allowed_ptr(current, cpumask_of(cpu)); was_offline = false; } + cond_resched(); } while (!torture_must_stop()); VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); -- 2.9.5