Re: [PATCH 7/9] sched: Add migrate_disable()

[Daniel Bristot de Oliveira]

On 9/23/20 7:08 PM, peterz@xxxxxxxxxxxxx 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