linux-kernel - Re: [PATCH 7/9] sched: Add migrate

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Message-ID: <ba44b3fe-352c-384e-5bde-c26e3a03011d@redhat.com>
Date:   Wed, 23 Sep 2020 19:54:20 +0200
From:   Daniel Bristot de Oliveira <bristot@...hat.com>
To:     peterz@...radead.org, Thomas Gleixner <tglx@...utronix.de>
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org,
        bigeasy@...utronix.de, qais.yousef@....com, swood@...hat.com,
        valentin.schneider@....com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        vincent.donnefort@....com
Subject: Re: [PATCH 7/9] sched: Add migrate_disable()

On 9/23/20 7:08 PM, peterz@...radead.org wrote:
> On Wed, Sep 23, 2020 at 10:31:10AM +0200, Thomas Gleixner wrote:
>>    In practice migrate disable could be taken into account on placement
>>    decisions, but yes we don't have anything like that at the moment.
> I think at the very least we should do some of that.
> 
> The premise is wanting to run the M highest priority tasks, when a CPU
> drops priority, it tries to PULL a higher priority task towards itself.
> If this PULL selects a migrate_disable() tasks, it means the task is in
> the M highest prio tasks.
> 
> Since obviously that task cannot get pulled, we should then pull the
> current running task of that CPU, this would then allow the
> migrate_disable() task to resume execution.
> 
> I'll go try and cook up something along those lines...
> 

sounds promising...

-- Daniel