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Commit e2787630 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

[hrtimer] Change resolution storage to ktime_t format 



Change the storage format of the per base resolution to ktime_t to
make it easier accessible in the hrtimers code.

Change the resolution from (NSEC_PER_SEC/HZ) to TICK_NSEC as Roman
pointed out. TICK_NSEC is closer to the real resolution.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 288867ec

include/linux/hrtimer.h

+1 −1
Original line number Diff line number Diff line
@@ -85,7 +85,7 @@ struct hrtimer_base { 
	spinlock_t		lock;

	struct rb_root		active;

	struct rb_node		*first;

	unsigned long		resolution;

	ktime_t			resolution;

	ktime_t			(*get_time)(void);

	struct hrtimer		*curr_timer;

};

include/linux/ktime.h

+2 −2
Original line number Diff line number Diff line
@@ -272,8 +272,8 @@ static inline u64 ktime_to_ns(const ktime_t kt) 
 * idea of the (in)accuracy of timers. Timer values are rounded up to

 * this resolution values.

 */

#define KTIME_REALTIME_RES	(NSEC_PER_SEC/HZ)

#define KTIME_MONOTONIC_RES	(NSEC_PER_SEC/HZ)

#define KTIME_REALTIME_RES	(ktime_t){ .tv64 = TICK_NSEC }

#define KTIME_MONOTONIC_RES	(ktime_t){ .tv64 = TICK_NSEC }



/* Get the monotonic time in timespec format: */

extern void ktime_get_ts(struct timespec *ts);

kernel/hrtimer.c

+1 −2
Original line number Diff line number Diff line
@@ -518,9 +518,8 @@ int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp) 
{

	struct hrtimer_base *bases;



	tp->tv_sec = 0;

	bases = per_cpu(hrtimer_bases, raw_smp_processor_id());

	tp->tv_nsec = bases[which_clock].resolution;

	*tp = ktime_to_timespec(bases[which_clock].resolution);



	return 0;

}