linux-kernel - Re: [PATCH v4 2/4] sched/isolation: Extend nohz

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Message-ID: <804569ba-a980-a4e7-59a7-3ef4ac8660de@redhat.com>
Date:   Fri, 23 Oct 2020 09:57:53 -0400
From:   Nitesh Narayan Lal <nitesh@...hat.com>
To:     Frederic Weisbecker <frederic@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-pci@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
        mtosatti@...hat.com, sassmann@...hat.com,
        jesse.brandeburg@...el.com, lihong.yang@...el.com,
        helgaas@...nel.org, jeffrey.t.kirsher@...el.com,
        jacob.e.keller@...el.com, jlelli@...hat.com, hch@...radead.org,
        bhelgaas@...gle.com, mike.marciniszyn@...el.com,
        dennis.dalessandro@...el.com, thomas.lendacky@....com,
        jiri@...dia.com, mingo@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, lgoncalv@...hat.com,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v4 2/4] sched/isolation: Extend nohz_full to isolate
 managed IRQs


On 10/23/20 9:29 AM, Frederic Weisbecker wrote:
> On Fri, Oct 23, 2020 at 03:25:05PM +0200, Peter Zijlstra wrote:
>> On Mon, Sep 28, 2020 at 02:35:27PM -0400, Nitesh Narayan Lal wrote:
>>> Extend nohz_full feature set to include isolation from managed IRQS. This
>> So you say it's for managed-irqs, the feature is actually called
>> MANAGED_IRQ, but, AFAICT, it does *NOT* in fact affect managed IRQs.
>>
>> Also, as per Thomas' earlier points, managed-irqs are in fact perfectly
>> fine and don't need help at at...
>>
>>> is required specifically for setups that only uses nohz_full and still
>>> requires isolation for maintaining lower latency for the listed CPUs.
>>>
>>> Suggested-by: Frederic Weisbecker <frederic@...nel.org>
> Ah and yes there is this tag :-p
>
> So that's my bad, I really thought this thing was about managed IRQ.
> The problem is that I can't find a single documentation about them so I'm
> too clueless on that matter.

I am also confused with this terminology.
So my bad for not taking care of this.

-- 
Thanks
Nitesh



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