Пример #1
0
void
count_syscall(struct tcb *tcp, const struct timeval *syscall_exiting_tv)
{
	struct timeval wtv;
	struct timeval *tv = &wtv;
	struct call_counts *cc;
	unsigned long scno = tcp->scno;

	if (!SCNO_IN_RANGE(scno))
		return;

	if (!counts)
		counts = xcalloc(nsyscalls, sizeof(*counts));
	cc = &counts[scno];

	cc->calls++;
	if (tcp->u_error)
		cc->errors++;

	/* tv = wall clock time spent while in syscall */
	tv_sub(tv, syscall_exiting_tv, &tcp->etime);

	/* Spent more wall clock time than spent system time? (usually yes) */
	if (tv_cmp(tv, &tcp->dtime) > 0) {
		static struct timeval one_tick = { -1, 0 };

		if (one_tick.tv_sec == -1) {
			/* Initialize it.  */
			struct itimerval it;

			memset(&it, 0, sizeof it);
			it.it_interval.tv_usec = 1;
			setitimer(ITIMER_REAL, &it, NULL);
			getitimer(ITIMER_REAL, &it);
			one_tick = it.it_interval;
//FIXME: this hack doesn't work (tested on linux-3.6.11): one_tick = 0.000000
//tprintf(" one_tick.tv_usec:%u\n", (unsigned)one_tick.tv_usec);
		}

		if (tv_nz(&tcp->dtime))
			/* tv = system time spent, if it isn't 0 */
			tv = &tcp->dtime;
		else if (tv_cmp(tv, &one_tick) > 0) {
			/* tv = smallest "sane" time interval */
			if (tv_cmp(&shortest, &one_tick) < 0)
				tv = &shortest;
			else
				tv = &one_tick;
		}
	}
	if (tv_cmp(tv, &shortest) < 0)
		shortest = *tv;
	tv_add(&cc->time, &cc->time, count_wallclock ? &wtv : tv);
}
Пример #2
0
void
count_syscall(struct tcb *tcp, struct timeval *tv)
{
	if (!SCNO_IN_RANGE(tcp->scno))
		return;

	if (!counts) {
		counts = calloc(nsyscalls, sizeof(*counts));
		if (!counts)
			die_out_of_memory();
	}

	counts[tcp->scno].calls++;
	if (tcp->u_error)
		counts[tcp->scno].errors++;

	tv_sub(tv, tv, &tcp->etime);
	if (tv_cmp(tv, &tcp->dtime) > 0) {
		static struct timeval one_tick;

		if (one_tick.tv_usec == 0) {
			/* Initialize it.  */
			struct itimerval it;

			memset(&it, 0, sizeof it);
			it.it_interval.tv_usec = 1;
			setitimer(ITIMER_REAL, &it, NULL);
			getitimer(ITIMER_REAL, &it);
			one_tick = it.it_interval;
		}

		if (tv_nz(&tcp->dtime))
			*tv = tcp->dtime;
		else if (tv_cmp(tv, &one_tick) > 0) {
			if (tv_cmp(&shortest, &one_tick) < 0)
				*tv = shortest;
			else
				*tv = one_tick;
		}
	}
	if (tv_cmp(tv, &shortest) < 0)
		shortest = *tv;
	tv_add(&counts[tcp->scno].time, &counts[tcp->scno].time, tv);
}