Re: selftests/sched_ext: testing on BPF CI

Andrea Righi
2025-01-29T07:27:18Z

Hi Ihor,

On Wed, Jan 29, 2025 at 12:21:43AM +0000, Ihor Solodrai wrote:
> Hi Tejun, Andrea.
>
> I tested a couple of variants of bpf-next + sched_ext source tree,
> just sharing the results.

Thanks for testing!

>
> I found a working state: BPF CI pipeline ran successfully twice
> (that's 8 build + run of selftests/sched_ext/runner in total).

Ok.

>
> Working state requires most patches between sched_ext/master and
> sched_ext/for-6.14-fixes [1], and also the patch
> "tools/sched_ext: Receive updates from SCX repo" [2]
>
> On plain bpf-next the dsp_local_on test fails [3].
> Without the patch [2] there is a build error [4]: missing
> SCX_ENUM_INIT definition.

We definitely need all the patches in sched_ext/for-6.14-fixes. I think
once Tejun sends the PR and we land the for-6.14-fixes upstream we should
reach a stable state with the sched_ext selftests. I don't have any other
additional pending fix at the moment.

>
> We probably don't want to enable selftests/sched_ext on BPF CI with
> that many "temporary" patches. I suggest to wait until all of this is
> merged upstream.

Sounds reasonable to me. Tejun?

>
> You can check the full list of patches here:
> https://github.com/kernel-patches/vmtest/pull/332/files
>
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git/log/?h=for-6.14-fixes
> [2] https://lore.kernel.org/all/Z1ucTqJP8IeIXZql@slm.duckdns.org/
> [3] https://github.com/kernel-patches/vmtest/actions/runs/13019837022
> [4] https://github.com/kernel-patches/vmtest/actions/runs/13020458479

Thanks,
-Andrea