Re: [PATCH sched_ext/for-6.13-fixes] sched_ext: Fix dsq_local_on selftest

Andrea Righi
2025-01-23T09:40:59Z

On Wed, Jan 22, 2025 at 07:10:00PM +0000, Ihor Solodrai wrote:
>
> On Tuesday, January 21st, 2025 at 5:40 PM, Tejun Heo <tj@kernel.org> wrote:
>
> >
> >
> > Hello, sorry about the delay.
> >
> > On Wed, Jan 15, 2025 at 11:50:37PM +0000, Ihor Solodrai wrote:
> > ...
> >
> > > 2025-01-15T23:28:55.8238375Z [ 5.334631] sched_ext: BPF scheduler "dsp_local_on" disabled (runtime error)
> > > 2025-01-15T23:28:55.8243034Z [ 5.335420] sched_ext: dsp_local_on: SCX_DSQ_LOCAL[_ON] verdict target cpu 1 not allowed for kworker/u8:1[33]
> >
> >
> > That's a head scratcher. It's a single node 2 cpu instance and all unbound
> > kworkers should be allowed on all CPUs. I'll update the test to test the
> > actual cpumask but can you see whether this failure is consistent or flaky?
>
> I re-ran all the jobs, and all sched_ext jobs have failed (3/3).
> Previous time only 1 of 3 runs failed.
>
> https://github.com/kernel-patches/vmtest/actions/runs/12798804552/job/36016405680

Oh I see what happens, SCX_DSQ_LOCAL_ON is (incorrectly) resolved to 0.

More exactly, none of the enum values are being resolved correctly, likely
due to the CO:RE enum refactoring. There’s probably something broken in
tools/testing/selftests/sched_ext/Makefile, I’ll take a look.

Thanks,
-Andrea