Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753404AbbEGLdJ (ORCPT ); Thu, 7 May 2015 07:33:09 -0400 Received: from terminus.zytor.com ([198.137.202.10]:57420 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751820AbbEGLdG (ORCPT ); Thu, 7 May 2015 07:33:06 -0400 Date: Thu, 7 May 2015 04:32:05 -0700 From: tip-bot for Chris Metcalf Message-ID: Cc: schwidefsky@de.ibm.com, fweisbec@gmail.com, umgwanakikbuti@gmail.com, davej@redhat.com, hpa@zytor.com, bp@alien8.de, peterz@infradead.org, cmetcalf@ezchip.com, paulmck@linux.vnet.ibm.com, tglx@linutronix.de, riel@redhat.com, rafael.j.wysocki@intel.com, oleg@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org Reply-To: davej@redhat.com, schwidefsky@de.ibm.com, umgwanakikbuti@gmail.com, fweisbec@gmail.com, cmetcalf@ezchip.com, paulmck@linux.vnet.ibm.com, tglx@linutronix.de, bp@alien8.de, hpa@zytor.com, peterz@infradead.org, oleg@redhat.com, linux-kernel@vger.kernel.org, riel@redhat.com, rafael.j.wysocki@intel.com, mingo@kernel.org In-Reply-To: <1430928266-24888-5-git-send-email-fweisbec@gmail.com> References: <1430928266-24888-5-git-send-email-fweisbec@gmail.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:timers/nohz] nohz: Set isolcpus when nohz_full is set Git-Commit-ID: 8cb9764fc88b41db11f251e8b2a0d006578b7eb4 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2168 Lines: 55 Commit-ID: 8cb9764fc88b41db11f251e8b2a0d006578b7eb4 Gitweb: http://git.kernel.org/tip/8cb9764fc88b41db11f251e8b2a0d006578b7eb4 Author: Chris Metcalf AuthorDate: Wed, 6 May 2015 18:04:26 +0200 Committer: Ingo Molnar CommitDate: Thu, 7 May 2015 12:02:51 +0200 nohz: Set isolcpus when nohz_full is set nohz_full is only useful with isolcpus are also set, since otherwise the scheduler has to run periodically to try to determine whether to steal work from other cores. Accordingly, when booting with nohz_full=xxx on the command line, we should act as if isolcpus=xxx was also set, and set (or extend) the isolcpus set to include the nohz_full cpus. Signed-off-by: Chris Metcalf Signed-off-by: Frederic Weisbecker Acked-by: Rik van Riel Acked-by: Mike Galbraith Acked-by: Peter Zijlstra (Intel) Cc: Borislav Petkov Cc: Dave Jones Cc: H. Peter Anvin Cc: Martin Schwidefsky Cc: Oleg Nesterov Cc: Paul E. McKenney Cc: Rafael J. Wysocki Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1430928266-24888-5-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 54f032c..b8f4876 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -7036,6 +7036,9 @@ void __init sched_init_smp(void) alloc_cpumask_var(&non_isolated_cpus, GFP_KERNEL); alloc_cpumask_var(&fallback_doms, GFP_KERNEL); + /* nohz_full won't take effect without isolating the cpus. */ + tick_nohz_full_add_cpus_to(cpu_isolated_map); + sched_init_numa(); /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/