From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752732AbdJ0MLT (ORCPT ); Fri, 27 Oct 2017 08:11:19 -0400 Received: from terminus.zytor.com ([65.50.211.136]:50121 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752326AbdJ0MLM (ORCPT ); Fri, 27 Oct 2017 08:11:12 -0400 Date: Fri, 27 Oct 2017 05:06:25 -0700 From: tip-bot for Frederic Weisbecker Message-ID: Cc: peterz@infradead.org, hpa@zytor.com, riel@redhat.com, tglx@linutronix.de, linux-kernel@vger.kernel.org, cmetcalf@mellanox.com, torvalds@linux-foundation.org, kernellwp@gmail.com, paulmck@linux.vnet.ibm.com, lcapitulino@redhat.com, mingo@kernel.org, cl@linux.com, frederic@kernel.org, efault@gmx.de Reply-To: cmetcalf@mellanox.com, linux-kernel@vger.kernel.org, tglx@linutronix.de, torvalds@linux-foundation.org, peterz@infradead.org, hpa@zytor.com, riel@redhat.com, cl@linux.com, mingo@kernel.org, efault@gmx.de, frederic@kernel.org, kernellwp@gmail.com, paulmck@linux.vnet.ibm.com, lcapitulino@redhat.com In-Reply-To: <1509072159-31808-13-git-send-email-frederic@kernel.org> References: <1509072159-31808-13-git-send-email-frederic@kernel.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched/isolation: Document the isolcpus= flags Git-Commit-ID: 98a06af93784a6ae541e9fc6292ef26177832543 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 Commit-ID: 98a06af93784a6ae541e9fc6292ef26177832543 Gitweb: https://git.kernel.org/tip/98a06af93784a6ae541e9fc6292ef26177832543 Author: Frederic Weisbecker AuthorDate: Fri, 27 Oct 2017 04:42:39 +0200 Committer: Ingo Molnar CommitDate: Fri, 27 Oct 2017 09:55:32 +0200 sched/isolation: Document the isolcpus= flags Signed-off-by: Frederic Weisbecker Acked-by: Thomas Gleixner Cc: Chris Metcalf Cc: Christoph Lameter Cc: Linus Torvalds Cc: Luiz Capitulino Cc: Mike Galbraith Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Rik van Riel Cc: Wanpeng Li Link: http://lkml.kernel.org/r/1509072159-31808-13-git-send-email-frederic@kernel.org Signed-off-by: Ingo Molnar --- Documentation/admin-guide/kernel-parameters.txt | 33 +++++++++++++++---------- 1 file changed, 20 insertions(+), 13 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 6b99c8b..5853618 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1727,20 +1727,27 @@ isapnp= [ISAPNP] Format: ,,, - isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. - The argument is a cpu list, as described above. + isolcpus= [KNL,SMP] Isolate a given set of CPUs from disturbance. + Format: [flag-list,] + + Specify one or more CPUs to isolate from disturbances + specified in the flag list (default: domain): + + nohz + Disable the tick when a single task runs. + domain + Isolate from the general SMP balancing and scheduling + algorithms. This option is the preferred way to isolate + CPUs from tasks. The alternative -- manually setting the + CPU mask of all tasks in the system, can cause problems + and suboptimal load balancer performance. You can move a + process onto or off an "isolated" CPU via the CPU + affinity syscalls or cpuset. begins at 0 + and the maximum value is "number of CPUs in system - 1". + + The format of is described above. + - This option can be used to specify one or more CPUs - to isolate from the general SMP balancing and scheduling - algorithms. You can move a process onto or off an - "isolated" CPU via the CPU affinity syscalls or cpuset. - begins at 0 and the maximum value is - "number of CPUs in system - 1". - - This option is the preferred way to isolate CPUs. The - alternative -- manually setting the CPU mask of all - tasks in the system -- can cause problems and - suboptimal load balancer performance. iucv= [HW,NET]