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sched/hrtimer: workaround for SCHED_RR in tickless mode.

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This commit provided workaround for incorrect SCHED_RR behavior in
tickless mode.

Signed-off-by: ouyangxiangzhen <ouyangxiangzhen@xiaomi.com>
This commit is contained in:
ouyangxiangzhen
2026-01-29 11:00:18 +08:00
committed by Donny(董九柱)
parent b685d97199
commit 5b978a7f9b
1 changed files with 21 additions and 8 deletions
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sched/sched/sched_processtickless.c
+21 -8
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@@ -351,22 +351,40 @@ static void nxsched_timer_start(clock_t ticks, clock_t interval)
* Name: nxsched_process_timer
*
* Description:
* if CONFIG_SCHED_TICKLESS is defined, then this function is provided by
* If CONFIG_SCHED_TICKLESS is defined, then this function is provided by
* the RTOS base code and called from platform-specific code when the
* interval timer used to implement the tick-less OS expires.
*
* Input Parameters:
* None.
*
* Returned Value:
* Base code implementation assumes that this function is called from
* interrupt handling logic with interrupts disabled.
*
* Note:
* The current SCHED_RR implementation has an issue: if a round-robin task
* is preempted, its timeslice counter does not decrement properly.
* Therefore, we must trigger the scheduler on each timer expiration to
* minimize the occurrence of this problem.
* This workaround can be removed once the SCHED_RR behavior is fixed.
*
****************************************************************************/
void nxsched_process_timer(void)
{
#ifdef CONFIG_HRTIMER
hrtimer_process(clock_systime_nsec());
uint64_t nsec = clock_systime_nsec();
hrtimer_process(nsec);
# if CONFIG_RR_INTERVAL > 0
/* Workaround for SCHED_RR, see the note. */
irqstate_t flags = enter_critical_section();
nxsched_process_event(div_const(nsec, (uint32_t)NSEC_PER_TICK), true);
leave_critical_section(flags);
# endif
#else
irqstate_t flags;
clock_t ticks;
@@ -380,12 +398,7 @@ void nxsched_process_timer(void)
up_timer_gettick(&ticks);
#if CONFIG_RR_INTERVAL > 0
/* The current SCHED_RR implementation has an issue: if a round-robin task
* is preempted, its timeslice counter does not decrement properly.
* Therefore, we must trigger the scheduler on each timer expiration to
* minimize the occurrence of this problem.
* This workaround can be removed once the SCHED_RR behavior is fixed.
*/
/* Workaround for SCHED_RR, see the note. */
nxsched_process_event(ticks, true);
#endif