Re: [PATCH 1/2] sched_ext: Fix idle state tracking across idle repicks

[Tejun Heo]

Hello, Andrea.

On Tue, Sep 15, 2026 at 08:23:51AM +0200, Andrea Righi wrote:
> We discussed essentially the same behavior here:
> https://lore.kernel.org/r/Zw5_FlXfbLXDLCPG@xxxxxxxxxxxxxxx
...
> The unused-reservation case can already be handled by restoring the cid's idle
> state at the end of ops.dispatch() when no task was selected for dispatch. For
> example, scx_cidland does this:
> https://github.com/sched-ext/scx/blob/6c54f4f664bb8e9cc445c8333128b4ba17b93608/scheds/experimental/scx_cidland/src/bpf/main.bpf.c#L2960

I completely forgot about that discussion. You're right, restoring the
claim from ops.dispatch() is the way to go. Dropping this patch. I'll
update scx_qmap to do that and document the pattern in ops.update_idle()
instead.

Thanks.

--
tejun