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

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Message-ID: <CAFTL4hwJsP9yBsw-05oajwRjLCnUQcy+QcZ2cLwZ70DcKgg8Vg@mail.gmail.com>
Date:   Fri, 27 Oct 2017 20:39:28 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     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, efault@....de, kernellwp@...il.com,
        paulmck@...ux.vnet.ibm.com, lcapitulino@...hat.com,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched/isolation: Document the isolcpus= flags

2017-10-27 20:21 UTC+02:00, Ingo Molnar <mingo@...nel.org>:
>
> * Frederic Weisbecker <frederic@...nel.org> wrote:
>
>> 2017-10-27 19:06 UTC+02:00, Ingo Molnar <mingo@...nel.org>:
>> >
>> > * Frederic Weisbecker <frederic@...nel.org> wrote:
>> >
>> >> 2017-10-27 15:58 UTC+02:00, Peter Zijlstra <peterz@...radead.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.
>> >
>> > Since it was the last commit in tip:sched/core that was pushed out just
>> > hours ago
>> > I zapped that last commit, please send an updated patch which we can
>> > apply
>> > and get
>> > a clean series.
>> >
>> > Thanks,
>>
>> Note the issue was there before that patch. But nevermind  I'll resend
>> an updated version of the patch.
>
> Yeah - so we get a single 'improve documentation' commit.

Ah ok I see. No problem I'll resend.

Thanks.