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Commit 3bd01206 authored by Arjan van de Ven's avatar Arjan van de Ven
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hrtimer: make the nanosleep() syscall use the per process slack 



This patch makes the nanosleep() system call use the per process
slack value; with this users are able to externally control existing
applications to reduce the wakeup rate.

Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
parent 96d2ab48

kernel/hrtimer.c

+6 −1
Original line number Diff line number Diff line
@@ -1563,9 +1563,14 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, 
	struct restart_block *restart;

	struct hrtimer_sleeper t;

	int ret = 0;

	unsigned long slack;



	slack = current->timer_slack_ns;

	if (rt_task(current))

		slack = 0;



	hrtimer_init_on_stack(&t.timer, clockid, mode);

	hrtimer_set_expires(&t.timer, timespec_to_ktime(*rqtp));

	hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack);

	if (do_nanosleep(&t, mode))

		goto out;