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Add a new performance counter for measuring periodic/interval events.

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px4dev
2012-11-12 01:35:51 -08:00
parent 7d8d7a76b9
commit dca3bce1ca
2 changed files with 67 additions and 6 deletions
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apps/systemlib/perf_counter.c
+65 -5
View File
@@ -73,6 +73,20 @@ struct perf_ctr_elapsed {
uint64_t time_most; uint64_t time_most;
}; };
/**
* PC_INTERVAL counter.
*/
struct perf_ctr_interval {
struct perf_ctr_header hdr;
uint64_t event_count;
uint64_t time_event;
uint64_t time_first;
uint64_t time_last;
uint64_t time_least;
uint64_t time_most;
};
/** /**
* List of all known counters. * List of all known counters.
*/ */
@@ -93,6 +107,10 @@ perf_alloc(enum perf_counter_type type, const char *name)
ctr = (perf_counter_t)calloc(sizeof(struct perf_ctr_elapsed), 1); ctr = (perf_counter_t)calloc(sizeof(struct perf_ctr_elapsed), 1);
break; break;
case PC_INTERVAL:
ctr = (perf_counter_t)calloc(sizeof(struct perf_ctr_interval), 1);
break;
default: default:
break; break;
} }
@@ -127,6 +145,32 @@ perf_count(perf_counter_t handle)
((struct perf_ctr_count *)handle)->event_count++; ((struct perf_ctr_count *)handle)->event_count++;
break; break;
case PC_INTERVAL: {
struct perf_ctr_interval *pci = (struct perf_ctr_interval *)handle;
hrt_abstime now = hrt_absolute_time();
switch (pci->event_count) {
case 0:
pci->time_first = now;
break;
case 1:
pci->time_least = now - pci->time_last;
pci->time_most = now - pci->time_last;
break;
default: {
hrt_abstime interval = now - pci->time_last;
if (interval < pci->time_least)
pci->time_least = interval;
if (interval > pci->time_most)
pci->time_most = interval;
break;
}
}
pci->time_last = now;
pci->event_count++;
break;
}
default: default:
break; break;
} }
@@ -187,13 +231,29 @@ perf_print_counter(perf_counter_t handle)
((struct perf_ctr_count *)handle)->event_count); ((struct perf_ctr_count *)handle)->event_count);
break; break;
case PC_ELAPSED: case PC_ELAPSED: {
struct perf_ctr_elapsed *pce = (struct perf_ctr_elapsed *)handle;
printf("%s: %llu events, %lluus elapsed, min %lluus max %lluus\n", printf("%s: %llu events, %lluus elapsed, min %lluus max %lluus\n",
handle->name, handle->name,
((struct perf_ctr_elapsed *)handle)->event_count, pce->event_count,
((struct perf_ctr_elapsed *)handle)->time_total, pce->time_total,
((struct perf_ctr_elapsed *)handle)->time_least, pce->time_least,
((struct perf_ctr_elapsed *)handle)->time_most); pce->time_most);
break;
}
case PC_INTERVAL: {
struct perf_ctr_interval *pci = (struct perf_ctr_interval *)handle;
printf("%s: %llu events, %llu avg, min %lluus max %lluus\n",
handle->name,
pci->event_count,
(pci->time_last - pci->time_first) / pci->event_count,
pci->time_least,
pci->time_most);
break;
}
default: default:
break; break;
apps/systemlib/perf_counter.h
+2 -1
View File
@@ -44,7 +44,8 @@
*/ */
enum perf_counter_type { enum perf_counter_type {
PC_COUNT, /**< count the number of times an event occurs */ PC_COUNT, /**< count the number of times an event occurs */
PC_ELAPSED /**< measure the time elapsed performing an event */ PC_ELAPSED, /**< measure the time elapsed performing an event */
PC_INTERVAL /**< measure the interval between instances of an event */
}; };
struct perf_ctr_header; struct perf_ctr_header;