From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933530AbdJXNdp (ORCPT ); Tue, 24 Oct 2017 09:33:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:38754 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933092AbdJXNHo (ORCPT ); Tue, 24 Oct 2017 09:07:44 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1460821908 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=frederic@kernel.org From: Frederic Weisbecker To: Ingo Molnar Cc: LKML , Frederic Weisbecker , Peter Zijlstra , Chris Metcalf , Thomas Gleixner , Luiz Capitulino , Christoph Lameter , "Paul E . McKenney" , Mike Galbraith , Rik van Riel , Wanpeng Li Subject: [PATCH 12/12] housekeeping: Document isolcpus flags Date: Tue, 24 Oct 2017 15:07:01 +0200 Message-Id: <1508850421-10058-13-git-send-email-frederic@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1508850421-10058-1-git-send-email-frederic@kernel.org> References: <1508850421-10058-1-git-send-email-frederic@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Rik van Riel Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Mike Galbraith Cc: Ingo Molnar Cc: Christoph Lameter Cc: Paul E. McKenney Cc: Wanpeng Li Cc: Luiz Capitulino --- Documentation/admin-guide/kernel-parameters.txt | 35 +++++++++++++++---------- 1 file changed, 21 insertions(+), 14 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 0549662..34ea914 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. - - 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. + 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. + + iucv= [HW,NET] -- 2.7.4