From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1751587AbbERCSe (ORCPT <rfc822;w@1wt.eu>);
	Sun, 17 May 2015 22:18:34 -0400
Received: from mx1.redhat.com ([209.132.183.28]:45792 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1750765AbbERCSZ (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Sun, 17 May 2015 22:18:25 -0400
Message-ID: <55594BC0.9070005@redhat.com>
Date: Sun, 17 May 2015 22:17:36 -0400
From: Rik van Riel <riel@redhat.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0
MIME-Version: 1.0
To: Mike Galbraith <umgwanakikbuti@gmail.com>,
        Sasha Levin <levinsasha928@gmail.com>
CC: Frederic Weisbecker <fweisbec@gmail.com>, Ingo Molnar <mingo@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Chris Metcalf <cmetcalf@ezchip.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Peter Zijlstra <peterz@infradead.org>, Dave Jones <davej@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>, Oleg Nesterov <oleg@redhat.com>,
        "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
        Ingo Molnar <mingo@redhat.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Re: [PATCH 4/4] nohz: Set isolcpus when nohz_full is set
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>
In-Reply-To: <1431840650.3222.78.camel@gmail.com>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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.

-- 
All rights reversed