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Commit 4ce105d3 authored by Arjan van de Ven's avatar Arjan van de Ven
Browse files

hrtimer: incorporate feedback from Peter Zijlstra 



(based on  lkml review)
* use rt_task()
* task_nice() has a sign

Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
parent da8f2e17

fs/select.c

+2 −3
Original line number Original line Diff line number Diff line
@@ -46,7 +46,7 @@ static unsigned long __estimate_accuracy(struct timespec *tv) 
	unsigned long slack;

	unsigned long slack;

	int divfactor = 1000;

	int divfactor = 1000;





	if (task_nice(current))

	if (task_nice(current) > 0)

		divfactor = divfactor / 5;

		divfactor = divfactor / 5;





	slack = tv->tv_nsec / divfactor;

	slack = tv->tv_nsec / divfactor;
@@ -66,8 +66,7 @@ static unsigned long estimate_accuracy(struct timespec *tv) 
	 * Realtime tasks get a slack of 0 for obvious reasons.

	 * Realtime tasks get a slack of 0 for obvious reasons.

	 */

	 */





	if (current->policy == SCHED_FIFO ||

	if (rt_task(current))

		current->policy == SCHED_RR)

		return 0;

		return 0;





	ktime_get_ts(&now);

	ktime_get_ts(&now);

include/linux/hrtimer.h

+1 −1
Original line number Original line Diff line number Diff line
@@ -363,7 +363,7 @@ static inline int hrtimer_start_expires(struct hrtimer *timer, 
	soft = hrtimer_get_softexpires(timer);

	soft = hrtimer_get_softexpires(timer);

	hard = hrtimer_get_expires(timer);

	hard = hrtimer_get_expires(timer);

	delta = ktime_to_ns(ktime_sub(hard, soft));

	delta = ktime_to_ns(ktime_sub(hard, soft));

	return hrtimer_start_range_ns(timer, hrtimer_get_expires(timer), delta, mode);

	return hrtimer_start_range_ns(timer, soft, delta, mode);

}

}





static inline int hrtimer_restart(struct hrtimer *timer)

static inline int hrtimer_restart(struct hrtimer *timer)