/* turn on all the timers */
extern int
kperf_timer_go(void)
{
unsigned i;
uint64_t now = mach_absolute_time();
for( i = 0; i < timerc; i++ )
{
if( timerv[i].period == 0 )
continue;
kperf_timer_schedule( &timerv[i], now );
}
return 0;
}
/* turn on all the timers */
void
kperf_timer_go(void)
{
/* get the PET thread going */
if (pet_timer_id < kperf_timerc) {
kperf_pet_config(kperf_timerv[pet_timer_id].actionid);
}
uint64_t now = mach_absolute_time();
for (unsigned int i = 0; i < kperf_timerc; i++) {
if (kperf_timerv[i].period == 0) {
continue;
}
kperf_timer_schedule(&(kperf_timerv[i]), now);
}
}
static void
kperf_timer_handler(void *param0, __unused void *param1)
{
struct kperf_timer *timer = param0;
unsigned int ntimer = (unsigned int)(timer - kperf_timerv);
unsigned int ncpus = machine_info.logical_cpu_max;
timer->active = 1;
/* along the lines of do not ipi if we are all shutting down */
if (kperf_sampling_status() == KPERF_SAMPLING_SHUTDOWN) {
goto deactivate;
}
BUF_DATA(PERF_TM_FIRE, ntimer, ntimer == pet_timer_id, timer->period,
timer->actionid);
if (ntimer == pet_timer_id) {
kperf_pet_fire_before();
/* clean-up the thread-on-CPUs cache */
bzero(kperf_thread_on_cpus, ncpus * sizeof(*kperf_thread_on_cpus));
}
/* ping all CPUs */
kperf_mp_broadcast_running(timer);
/* release the pet thread? */
if (ntimer == pet_timer_id) {
/* PET mode is responsible for rearming the timer */
kperf_pet_fire_after();
} else {
/*
* FIXME: Get the current time from elsewhere. The next
* timer's period now includes the time taken to reach this
* point. This causes a bias towards longer sampling periods
* than requested.
*/
kperf_timer_schedule(timer, mach_absolute_time());
}
deactivate:
timer->active = 0;
}
static void
kperf_timer_handler( void *param0, __unused void *param1 )
{
struct time_trigger *trigger = param0;
unsigned ntimer = (unsigned)(trigger - timerv);
unsigned ncpus = machine_info.logical_cpu_max;
trigger->active = 1;
/* along the lines of do not ipi if we are all shutting down */
if( kperf_sampling_status() == KPERF_SAMPLING_SHUTDOWN )
goto deactivate;
/* clean-up the thread-on-CPUs cache */
bzero(kperf_thread_on_cpus, ncpus * sizeof(*kperf_thread_on_cpus));
/* ping all CPUs */
#ifndef USE_SIMPLE_SIGNALS
kperf_mp_broadcast( kperf_ipi_handler, trigger );
#else
trigger->fire_count++;
OSMemoryBarrier();
kperf_mp_signal();
#endif
/* release the pet thread? */
if( ntimer == pet_timer )
{
/* timer re-enabled when thread done */
kperf_pet_thread_go();
}
else
{
/* re-enable the timer
* FIXME: get the current time from elsewhere
*/
uint64_t now = mach_absolute_time();
kperf_timer_schedule( trigger, now );
}
deactivate:
trigger->active = 0;
}
