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 S1752606AbdJ0Ogi (ORCPT <rfc822;w@1wt.eu>);
        Fri, 27 Oct 2017 10:36:38 -0400
Received: from mail.kernel.org ([198.145.29.99]:53572 "EHLO mail.kernel.org"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1751516AbdJ0Ogf (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Fri, 27 Oct 2017 10:36:35 -0400
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BCFDF21942
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
X-Google-Smtp-Source: ABhQp+TUEi/9QyRSP3SZq0jRJOaDuwewO9p6WFDL7W0/RAEDqPWKrynxfHYSP+pz89UCmCRZTgrKVDr8jrssaWi5+PE=
MIME-Version: 1.0
In-Reply-To: <20171027135831.GZ3165@worktop.lehotels.local>
References: <1509072159-31808-13-git-send-email-frederic@kernel.org>
 <tip-98a06af93784a6ae541e9fc6292ef26177832543@git.kernel.org> <20171027135831.GZ3165@worktop.lehotels.local>
From: Frederic Weisbecker <frederic@kernel.org>
Date: Fri, 27 Oct 2017 16:36:33 +0200
X-Gmail-Original-Message-ID: <CAFTL4hxLPZGPgwVnoh9SrEicymA=XSVLuwCwLQiohWYOha93gQ@mail.gmail.com>
Message-ID: <CAFTL4hxLPZGPgwVnoh9SrEicymA=XSVLuwCwLQiohWYOha93gQ@mail.gmail.com>
Subject: Re: [tip:sched/core] sched/isolation: Document the isolcpus= flags
To: Peter Zijlstra <peterz@infradead.org>
Cc: cmetcalf@mellanox.com, linux-kernel@vger.kernel.org,
        tglx@linutronix.de, torvalds@linux-foundation.org, hpa@zytor.com,
        riel@redhat.com, cl@linux.com, mingo@kernel.org, efault@gmx.de,
        kernellwp@gmail.com, paulmck@linux.vnet.ibm.com,
        lcapitulino@redhat.com, linux-tip-commits@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

2017-10-27 15:58 UTC+02:00, Peter Zijlstra <peterz@infradead.org>:
> On Fri, Oct 27, 2017 at 05:06:25AM -0700, tip-bot for Frederic Weisbecker
> wrote:
>> +	isolcpus=	[KNL,SMP] Isolate a given set of CPUs from disturbance.
>> +			Format: [flag-list,]<cpu-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.
>
> I _strongly_ object to this statement, isolcpus is _not_ the preferred
> way, cpusets are.
>
> And yes, while cpusets suffers some problems, we _should_ really fix
> those and not promote this piece of shit isolcpus crap.

I definitely agree with that so your position is a relief :-) This
patch only indented the existing parameter documentation so fixing its
content was beyond its scope. I'll send a patch to correct the text.

Thanks.