Re: [PATCH v2 0/4] sched/fair: Active balancer RT/DL preemption fix

[Valentin Schneider]

Hi Juri,

On 01/10/2019 14:31, Juri Lelli wrote:
> Hi Valentin,
> 
> On 01/10/19 11:29, Valentin Schneider wrote:
>> (expanded the Cc list)
>> RT/DL folks, any thought on the thing?
> 
> Even if I like your idea and it looks theoretically the right thing to
> do, I'm not sure we want it in practice if it adds complexity to CFS.
> 
> I personally never noticed this kind of interference from CFS, but, at
> the same time, for RT we usually like more to be safe than sorry.
> However, since this doesn't seem to be bullet-proof (as you also say), I
> guess it all boils down again to complexity vs. practical benefits.
> 

Thanks for having a look.

IMO worst part is the local detach_one_task() thing, I added that after v1
following Qais' comments but perhaps it doesn't gain us much.

I'll try to cook something up with rt-app and see if I can get sensible
numbers.

> Best,
> 
> Juri
>