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kernel: sched: sleep: Use value returned by z_add_timeout

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z_tick_sleep function needs to calculate expected wakeup tick. It
required reading current system clock tick. It can be costly since
it is a register access. When timeout is added this value is
calculated and z_add_timeout returns it. It can be used instead to
optimize sleep performance.

Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
This commit is contained in:
Krzysztof Chruściński 2025-03-28 09:42:04 +01:00 • committed by Benjamin Cabé
commit 66daaf6ba3
1 changed files with 1 additions and 7 deletions
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8
kernel/sched.c
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@ -1091,19 +1091,13 @@ static int32_t z_tick_sleep(k_timeout_t timeout)
return 0;
}
if (Z_IS_TIMEOUT_RELATIVE(timeout)) {
expected_wakeup_ticks = timeout.ticks + sys_clock_tick_get_32();
} else {
expected_wakeup_ticks = Z_TICK_ABS(timeout.ticks);
}
k_spinlock_key_t key = k_spin_lock(&_sched_spinlock);
#if defined(CONFIG_TIMESLICING) && defined(CONFIG_SWAP_NONATOMIC)
pending_current = _current;
#endif /* CONFIG_TIMESLICING && CONFIG_SWAP_NONATOMIC */
unready_thread(_current);
z_add_thread_timeout(_current, timeout);
expected_wakeup_ticks = (uint32_t)z_add_thread_timeout(_current, timeout);
z_mark_thread_as_sleeping(_current);
(void)z_swap(&_sched_spinlock, key);