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timekeeping: Distangle resume and clock-was-set events

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Resuming timekeeping is a clock-was-set event and uses the clock-was-set
notification mechanism. This is in the way of making the clock-was-set
update for hrtimers selective so unnecessary IPIs are avoided when a CPU
base does not have timers queued which are affected by the clock setting.

Distangle it by invoking hrtimer_resume() on each unfreezing CPU and invoke
the new timerfd_resume() function from timekeeping_resume() which is the
only place where this is needed.

Rename hrtimer_resume() to hrtimer_resume_local() to reflect the change.

With this the clock_was_set*() functions are not longer required to IPI all
CPUs unconditionally and can get some smarts to avoid them.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210713135158.488853478@linutronix.de
This commit is contained in:
Thomas Gleixner
2021-07-13 15:39:51 +02:00
parent 66f7b0c8aa
commit a761a67f59
5 changed files with 18 additions and 11 deletions
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1
include/linux/hrtimer.h
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@@ -354,7 +354,6 @@ extern void timerfd_resume(void);
static inline void timerfd_clock_was_set(void) { }
static inline void timerfd_resume(void) { }
#endif
extern void hrtimers_resume(void);
DECLARE_PER_CPU(struct tick_device, tick_cpu_device);