C++ (Cpp) trace_itimer_state Examples

Example #1

File: itimer.c Project: AlexShiLucky/linux

static void set_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
			   const struct itimerval *const value,
			   struct itimerval *const ovalue)
{
	u64 oval, nval, ointerval, ninterval;
	struct cpu_itimer *it = &tsk->signal->it[clock_id];

	/*
	 * Use the to_ktime conversion because that clamps the maximum
	 * value to KTIME_MAX and avoid multiplication overflows.
	 */
	nval = ktime_to_ns(timeval_to_ktime(value->it_value));
	ninterval = ktime_to_ns(timeval_to_ktime(value->it_interval));

	spin_lock_irq(&tsk->sighand->siglock);

	oval = it->expires;
	ointerval = it->incr;
	if (oval || nval) {
		if (nval > 0)
			nval += TICK_NSEC;
		set_process_cpu_timer(tsk, clock_id, &nval, &oval);
	}
	it->expires = nval;
	it->incr = ninterval;
	trace_itimer_state(clock_id == CPUCLOCK_VIRT ?
			   ITIMER_VIRTUAL : ITIMER_PROF, value, nval);

	spin_unlock_irq(&tsk->sighand->siglock);

	if (ovalue) {
		ovalue->it_value = ns_to_timeval(oval);
		ovalue->it_interval = ns_to_timeval(ointerval);
	}
}

Example #2

File: itimer.c Project: MuMu360121/jordan-kernel

int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
{
	struct task_struct *tsk = current;
	struct hrtimer *timer;
	ktime_t expires;

	/*
	 * Validate the timevals in value.
	 */
	if (!timeval_valid(&value->it_value) ||
	    !timeval_valid(&value->it_interval))
		return -EINVAL;

	trace_timer_itimer_set(which, value);

	switch (which) {
	case ITIMER_REAL:
again:
		spin_lock_irq(&tsk->sighand->siglock);
		timer = &tsk->signal->real_timer;
		if (ovalue) {
			ovalue->it_value = itimer_get_remtime(timer);
			ovalue->it_interval
				= ktime_to_timeval(tsk->signal->it_real_incr);
		}
		/* We are sharing ->siglock with it_real_fn() */
		if (hrtimer_try_to_cancel(timer) < 0) {
			spin_unlock_irq(&tsk->sighand->siglock);
			goto again;
		}
		expires = timeval_to_ktime(value->it_value);
		if (expires.tv64 != 0) {
			tsk->signal->it_real_incr =
				timeval_to_ktime(value->it_interval);
			hrtimer_start(timer, expires, HRTIMER_MODE_REL);
		} else
			tsk->signal->it_real_incr.tv64 = 0;

		trace_itimer_state(ITIMER_REAL, value, 0);
		spin_unlock_irq(&tsk->sighand->siglock);
		break;
	case ITIMER_VIRTUAL:
		set_cpu_itimer(tsk, CPUCLOCK_VIRT, value, ovalue);
		break;
	case ITIMER_PROF:
		set_cpu_itimer(tsk, CPUCLOCK_PROF, value, ovalue);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

Example #3

File: itimer.c Project: CSCLOG/beaglebone

static void set_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
			   const struct itimerval *const value,
			   struct itimerval *const ovalue)
{
	cputime_t cval, nval, cinterval, ninterval;
	s64 ns_ninterval, ns_nval;
	u32 error, incr_error;
	struct cpu_itimer *it = &tsk->signal->it[clock_id];

	nval = timeval_to_cputime(&value->it_value);
	ns_nval = timeval_to_ns(&value->it_value);
	ninterval = timeval_to_cputime(&value->it_interval);
	ns_ninterval = timeval_to_ns(&value->it_interval);

	error = cputime_sub_ns(nval, ns_nval);
	incr_error = cputime_sub_ns(ninterval, ns_ninterval);

	spin_lock_irq(&tsk->sighand->siglock);

	cval = it->expires;
	cinterval = it->incr;
	if (!cputime_eq(cval, cputime_zero) ||
	    !cputime_eq(nval, cputime_zero)) {
		if (cputime_gt(nval, cputime_zero))
			nval = cputime_add(nval, cputime_one_jiffy);
		set_process_cpu_timer(tsk, clock_id, &nval, &cval);
	}
	it->expires = nval;
	it->incr = ninterval;
	it->error = error;
	it->incr_error = incr_error;
	trace_itimer_state(clock_id == CPUCLOCK_VIRT ?
			   ITIMER_VIRTUAL : ITIMER_PROF, value, nval);

	spin_unlock_irq(&tsk->sighand->siglock);

	if (ovalue) {
		cputime_to_timeval(cval, &ovalue->it_value);
		cputime_to_timeval(cinterval, &ovalue->it_interval);
	}
}