Re: [PATCH] sched_ext: Invalidate dispatch decisions on CPU affinity changes

[Tejun Heo]

Hello,

On Wed, Feb 04, 2026 at 01:31:35PM -1000, Tejun Heo wrote:
...
> I wonder whether we should define an invalid qseq and use that instead. The
> queueing instance really is invalid after this and it would help catching
> cases where BPF scheduler makes mistakes w/ synchronization. Also, wouldn't
> dequeue_task_scx() or ops_dequeue() be a better place to shoot down the
> enqueued instances? While the symptom we most immediately see are through
> cpumask changes, the underlying problem is dequeue not shooting down
> existing enqueued tasks.

Hmmm... in fact, this is all happening already, right? Isn't all that's
missing the BPF scheduler's ops.dequeue() synchronizing against
scx_bpf_dsq_insert()?

Thanks.

-- 
tejun