Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751396AbbERD30 (ORCPT ); Sun, 17 May 2015 23:29:26 -0400 Received: from mail-wi0-f172.google.com ([209.85.212.172]:34764 "EHLO mail-wi0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750981AbbERD3T (ORCPT ); Sun, 17 May 2015 23:29:19 -0400 Message-ID: <1431919756.2518.51.camel@gmail.com> Subject: Re: [PATCH 4/4] nohz: Set isolcpus when nohz_full is set From: Mike Galbraith To: Rik van Riel Cc: Sasha Levin , Frederic Weisbecker , Ingo Molnar , LKML , Chris Metcalf , "Rafael J . Wysocki" , Peter Zijlstra , Dave Jones , Thomas Gleixner , Oleg Nesterov , "Paul E . McKenney" , Ingo Molnar , Martin Schwidefsky Date: Mon, 18 May 2015 05:29:16 +0200 In-Reply-To: <55594BC0.9070005@redhat.com> References: <1430928266-24888-1-git-send-email-fweisbec@gmail.com> <1430928266-24888-5-git-send-email-fweisbec@gmail.com> <55579CE0.5060801@gmail.com> <1431840650.3222.78.camel@gmail.com> <55594BC0.9070005@redhat.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.11 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1070 Lines: 24 On Sun, 2015-05-17 at 22:17 -0400, Rik van Riel wrote: > On 05/17/2015 01:30 AM, Mike Galbraith wrote: > > > Given that kernel initiated association to isolcpus, a user turning > > NO_HZ_FULL_ALL on had better not have much generic load to manage. If > > he/she does not have CPUSETS enabled, or should Rik's patch rendering > > isolcpus immutable be merged, > > My patch does not aim to make isolcpus immutable, it aims to make > isolcpus resistent to system management tools (like libvirt) > automatically undoing isolcpus the instant a cpuset with the default > cpus (inherited from the root group) is created. Aim or not, if cpusets is the sole modifier, it'll render isolcpus immutable, no? Cpusets could grow an override to the override I suppose, to regain control of the resource it thinks it manages. -Mike -- 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/