Re: [PATCH v3 3/5] sched/fair: Switch to task based throttle model

[Aaron Lu <ziqianlu@bytedance.com>]

Hi Florian,

On Thu, Sep 04, 2025 at 07:33:03AM +0000, Bezdeka, Florian wrote:
> Hi Aaron,
> 
> On Wed, 2025-09-03 at 19:35 +0800, Aaron Lu wrote:
> > 
> > > [..snip..]
> > > > 
> > 
> > Just want to add that with the above diff applied, I also tested
> > songtang's stress test[0] and Jan's rt deadlock reproducer[1] and didn't
> > see any problem.
> 
> Thanks a lot for taking the reproducer into account. But: To trigger
> PREEMPT_RT needs to be enabled, otherwise the rwlock in the epoll
> infrastructure (that we highly stress) won't sleep. Just to be sure:
> PREEMPT_RT was enabled on your end?
>

Yes, understood.

I've PREEMPT_RT enabled when running Jan's rt deadlock reproducer. I
also run base and make sure there is hung happened in base before
testing this series. Normally, base would hung in 2 minutes and when
testing this series, I'll give it 5 minutes to see if anything abnormal
happened.

> > 
> > [0]: https://lore.kernel.org/lkml/20250715072218.GA304@bytedance/
> > [1]: https://lore.kernel.org/all/7483d3ae-5846-4067-b9f7-390a614ba408@siemens.com/