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=-12.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 1BEE7C433E0 for ; Wed, 20 Jan 2021 04:32:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C5C912313F for ; Wed, 20 Jan 2021 04:32:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727630AbhATEc3 (ORCPT ); Tue, 19 Jan 2021 23:32:29 -0500 Received: from mail.kernel.org ([198.145.29.99]:52934 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726491AbhATEcZ (ORCPT ); Tue, 19 Jan 2021 23:32:25 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id BD50523138; Wed, 20 Jan 2021 04:31:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611117104; bh=Yo6Rl/X65irlG0tJBG8sFBy+6ANz0e/RhHYaD+X8Hxk=; h=Date:From:To:Cc:Subject:Reply-To:From; b=tuxlr6q9Ik8XFxclFMMtvvnLv+MwgYuOZ3zb5z+aFJMDNeZmMqIqSN3a3XiwyhpY0 65DSyHESf0l9vqELswf9/+K8dVhLsX3ISJgxZi966uAeJ0gKXZjt23zuJ/+Z4YtPAA SFMTNnaJS1T7Nh4NCoOGyCwherW+uAKs/9J3wreRwVkV+l6FrdL5nGGwuYiydfcfPv AOSLDTP5OawvsePKNTiAoRQSxLr+O2tIa76o0hG7jhRrQ/P7qpPYX8RORi1pnVLoJe A2nxcLUsWYC9nQd5OU9vws6eGGAZK3PVEFgXSqyuqsR/3gZRQ6IAdxY8c2h6o91r/m SHOobmWpq3ENg== Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 7926F35215BE; Tue, 19 Jan 2021 20:31:44 -0800 (PST) Date: Tue, 19 Jan 2021 20:31:44 -0800 From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, mingo@kernel.org, jiangshanlai@gmail.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, bigeasy@linutronix.de, swood@redhat.com Subject: [PATCH tip/core/rcu 0/4] Fix RCU priority boosting Message-ID: <20210120043144.GA7045@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This series fixes a bug in which an RCU-priority-boosted task can stay boosted for some time after it has exited its RCU read-side critical section. This bug arose during the RCU flavor consolidation effort. The patches are as follows: 1. Expedite deboost in case of deferred quiescent state. 2. Make TREE03 use real-time tree.use_softirq setting. 3. Run rcuo kthreads at elevated priority in CONFIG_RCU_BOOST kernels. 4. Fix testing of RCU priority boosting. Thanx, Paul ------------------------------------------------------------------------ kernel/rcu/rcutorture.c | 36 +++++++------ kernel/rcu/tree_plugin.h | 28 +++++----- tools/testing/selftests/rcutorture/configs/rcu/TREE03.boot | 1 3 files changed, 39 insertions(+), 26 deletions(-)