On 28 Mar 2023 11:26:30 +0200 Peter Zijlstra <peterz@xxxxxxxxxxxxx>
>
> check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
> {
> - unsigned long ideal_runtime, delta_exec;
> + unsigned long delta_exec;
> struct sched_entity *se;
> s64 delta;
>
> - /*
> - * When many tasks blow up the sched_period; it is possible that
> - * sched_slice() reports unusually large results (when many tasks are
> - * very light for example). Therefore impose a maximum.
> - */
> - ideal_runtime = min_t(u64, sched_slice(cfs_rq, curr), sysctl_sched_latency);
> + if (sched_feat(EEVDF)) {
> + if (pick_eevdf(cfs_rq) != curr)
> + goto preempt;
> +
> + return;
> + }
Given deadline, the tick preempt can be replaced with a timer expiring at the EDL.
