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=-10.1 required=3.0 tests=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=unavailable 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 AB8F8C35242 for ; Sat, 15 Feb 2020 00:37:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7301D206CC for ; Sat, 15 Feb 2020 00:37:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581727064; bh=64QHb1k1b5l5Sao9tVo4racHv6KhnJTPOsWRA6w8thg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kQ031W3gZZTh4JXFQSFbi2ulHJZGUtuNY1k0vydf0hsdpo33PCwwIUW9/+Tg234+a zGTT/mm9t+dK1iH4wJsEB1m+LbD/pZOTn77GvLZxZk22EOAoTdExiCVQDaorI+LKMb CJfai/yOKRCqI5JMzwsGZWVggSjkckmVtB39UDDA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728077AbgBOAhn (ORCPT ); Fri, 14 Feb 2020 19:37:43 -0500 Received: from mail.kernel.org ([198.145.29.99]:47680 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728023AbgBOAhg (ORCPT ); Fri, 14 Feb 2020 19:37:36 -0500 Received: from paulmck-ThinkPad-P72.c.hoisthospitality.com (unknown [62.84.152.189]) (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 69C6924650; Sat, 15 Feb 2020 00:37:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581727056; bh=64QHb1k1b5l5Sao9tVo4racHv6KhnJTPOsWRA6w8thg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qTBWVpTOkKxFSaECtTDAAmlsNIBBPJSz5RbeCZjh2wzWztrEG0Qnqe+Z/LwJtevpS +UapSsP7YRAYjJBXlAbGaEFVS5fGb/Xn4aUYtCrhA1ME9D4bTtvSj8go8pYerwP5ii c5oZ0Fkph232pabMAd+ZO0AXD/pIRIWFLA8UHfsQ= 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 06/18] rcutorture: Suppress boottime bad-sequence warnings Date: Fri, 14 Feb 2020 16:36:59 -0800 Message-Id: <20200215003711.16463-6-paulmck@kernel.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20200215003634.GA16227@paulmck-ThinkPad-P72> References: <20200215003634.GA16227@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" In normal production, an excessively long wait on a grace period (synchronize_rcu(), for example) at boottime is often just as bad as at any other time. In fact, given the desire for fast boot, any sort of long wait at boot is a bad idea. However, heavy rcutorture testing on large hyperthreaded systems can generate such long waits during boot as a matter of course. This commit therefore causes the rcupdate.rcu_cpu_stall_suppress_at_boot kernel boot parameter to suppress reporting of bootime bad-sequence warning due to excessively long grace-period waits. Signed-off-by: Paul E. McKenney --- kernel/rcu/rcutorture.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 16c84ec..5efd950 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1423,7 +1423,8 @@ rcu_torture_stats_print(void) pr_alert("%s%s ", torture_type, TORTURE_FLAG); pr_cont("rtc: %p %s: %lu tfle: %d rta: %d rtaf: %d rtf: %d ", rcu_torture_current, - rcu_torture_current ? "ver" : "VER", + rcu_torture_current && !rcu_stall_is_suppressed_at_boot() + ? "ver" : "VER", rcu_torture_current_version, list_empty(&rcu_torture_freelist), atomic_read(&n_rcu_torture_alloc), -- 2.9.5