linux-kernel - Re: [tip:sched/core] sched/isolation: Document the isolcpus= flags

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Message-ID: <1509115109.6780.8.camel@gmx.de>
Date:   Fri, 27 Oct 2017 16:38:29 +0200
From:   Mike Galbraith <efault@....de>
To:     Peter Zijlstra <peterz@...radead.org>, cmetcalf@...lanox.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        torvalds@...ux-foundation.org, hpa@...or.com, riel@...hat.com,
        cl@...ux.com, mingo@...nel.org, frederic@...nel.org,
        kernellwp@...il.com, paulmck@...ux.vnet.ibm.com,
        lcapitulino@...hat.com
Cc:     linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched/isolation: Document the isolcpus= flags

On Fri, 2017-10-27 at 15:58 +0200, Peter Zijlstra wrote:
> 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.

+1, isolcpus is the dinosaur that just won't frickn' die.

	-Mike