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Use tif_resched(NR_now) to do that. This path should be identical across preemption models which is borne out by comparing latency via perf bench sched pipe (5 runs): PREEMPT_AUTO: 4.430 usecs/op +- 0.080 ( +- 1.800% ) PREEMPT_DYNAMIC: 4.400 usecs/op +- 0.100 ( +- 2.270% ) Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Juri Lelli Cc: Vincent Guittot Originally-by: Thomas Gleixner Link: https://lore.kernel.org/lkml/87jzshhexi.ffs@tglx/ Signed-off-by: Ankur Arora --- kernel/sched/core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 6596b5e0b6c8..5e3dd95efb73 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1045,6 +1045,9 @@ static resched_t resched_opt_translate(struct task_struct *curr, if (!IS_ENABLED(CONFIG_PREEMPT_AUTO)) return NR_now; + if (is_idle_task(curr)) + return NR_now; + return NR_lazy; }