LT_PROBE_DEFINE(sched_waking, struct task_struct *p, int success)
#endif
{
struct schedkey key;
int i;
enum latency_tracker_event_in_ret ret;
if (!latency_tracker_get_tracking_on(tracker))
return;
if (!p || !p->pid)
return;
/*
* Make sure we won't wait for a process already running on another CPU.
*/
for (i = 0; i < NR_CPUS; i++)
if (current_pid[i] == p->pid)
return;
key.pid = p->pid;
ret = latency_tracker_event_in(tracker, &key, sizeof(key),
1, latency_tracker_get_priv(tracker));
if (ret == LATENCY_TRACKER_FULL) {
// printk("latency_tracker sched: no more free events, consider "
// "increasing the max_events parameter\n");
} else if (ret) {
// printk("latency_tracker sched: error adding event\n");
}
}
static
void probe_sched_wakeup(void *ignore, struct task_struct *p, int success)
{
struct schedkey key;
u64 thresh, timeout;
int i;
enum latency_tracker_event_in_ret ret;
if (!p || !p->pid)
return;
/*
* Make sure we won't wait for a process already running on another CPU.
*/
for (i = 0; i < NR_CPUS; i++)
if (current_pid[i] == p->pid)
return;
key.pid = p->pid;
thresh = usec_threshold * 1000;
timeout = usec_timeout * 1000;
ret = latency_tracker_event_in(tracker, &key, sizeof(key),
thresh, wakeup_cb, timeout, 1,
latency_tracker_get_priv(tracker));
if (ret == LATENCY_TRACKER_FULL) {
// printk("latency_tracker sched: no more free events, consider "
// "increasing the max_events parameter\n");
} else if (ret) {
printk("latency_tracker sched: error adding event\n");
}
}
static
void __exit wakeup_latency_exit(void)
{
uint64_t skipped;
struct wakeup_tracker *wakeup_priv;
lttng_wrapper_tracepoint_probe_unregister("sched_waking",
probe_sched_waking, NULL);
lttng_wrapper_tracepoint_probe_unregister("sched_switch",
probe_sched_switch, NULL);
tracepoint_synchronize_unregister();
skipped = latency_tracker_skipped_count(tracker);
wakeup_priv = latency_tracker_get_priv(tracker);
wakeup_destroy_priv(wakeup_priv);
latency_tracker_destroy(tracker);
printk("Missed events : %llu\n", skipped);
printk("Total wakeup alerts : %d\n", cnt);
}