diff options
| author | Thomas Gleixner <tglx@kernel.org> | 2026-02-24 17:35:42 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-02-27 16:40:04 +0100 |
| commit | 0a93d30861617ecf207dcc4c6c736435fac36dae (patch) | |
| tree | 0f4a976d147de5687b07f04616fae29dc10217ea /include/linux | |
| parent | d19ff16c11db38f3ee179d72751fb9b340174330 (diff) | |
hrtimer: Provide a static branch based hrtimer_hres_enabled()
The scheduler evaluates this via hrtimer_is_hres_active() every time it has
to update HRTICK. This needs to follow three pointers, which is expensive.
Provide a static branch based mechanism to avoid that.
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260224163429.136503358@kernel.org
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/hrtimer.h | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h index 74adbd4e7003..c9ca105ba009 100644 --- a/include/linux/hrtimer.h +++ b/include/linux/hrtimer.h @@ -153,17 +153,22 @@ static inline int hrtimer_is_hres_active(struct hrtimer *timer) } #ifdef CONFIG_HIGH_RES_TIMERS +extern unsigned int hrtimer_resolution; struct clock_event_device; extern void hrtimer_interrupt(struct clock_event_device *dev); -extern unsigned int hrtimer_resolution; +extern struct static_key_false hrtimer_highres_enabled_key; -#else +static inline bool hrtimer_highres_enabled(void) +{ + return static_branch_likely(&hrtimer_highres_enabled_key); +} +#else /* CONFIG_HIGH_RES_TIMERS */ #define hrtimer_resolution (unsigned int)LOW_RES_NSEC - -#endif +static inline bool hrtimer_highres_enabled(void) { return false; } +#endif /* !CONFIG_HIGH_RES_TIMERS */ static inline ktime_t __hrtimer_expires_remaining_adjusted(const struct hrtimer *timer, ktime_t now) |