Will be used for testing the module.
Signed-off-by: Jakub Sitnicki <[email protected]>
---
lib/performance.c | 34 ++++++++++++++++++++++++++++++++++
lib/performance.h | 13 +++++++++++++
2 files changed, 47 insertions(+)
diff --git a/lib/performance.c b/lib/performance.c
index e37dcd169..8af124d1d 100644
--- a/lib/performance.c
+++ b/lib/performance.c
@@ -215,6 +215,40 @@ add_sample(struct performance *perf, double new_sample)
calc_average(&perf->long_term, new_sample);
}
+static bool
+performance_get_stats_protected(const char *name,
+ struct performance_stats *stats)
+{
+ struct performance *perf;
+
+ perf = shash_find_data(&performances, name);
+ if (!perf) {
+ return false;
+ }
+
+ stats->count = perf->samples;
+ stats->unit = perf->units;
+ stats->max = perf->max;
+ stats->min = perf->min;
+ stats->pctl_95 = perf->pctl.percentile;
+ stats->ewma_50 = perf->short_term.average;
+ stats->ewma_1 = perf->long_term.average;
+
+ return true;
+}
+
+bool
+performance_get_stats(const char *name, struct performance_stats *stats)
+{
+ bool found = false;
+
+ ovs_mutex_lock(&performances_lock);
+ found = performance_get_stats_protected(name, stats);
+ ovs_mutex_unlock(&performances_lock);
+
+ return found;
+}
+
static void
performance_print(struct performance *perf, const char *name,
struct ds *s)
diff --git a/lib/performance.h b/lib/performance.h
index f039689e8..09ca844b9 100644
--- a/lib/performance.h
+++ b/lib/performance.h
@@ -24,6 +24,16 @@ enum performance_units {
PERF_NS,
};
+struct performance_stats {
+ unsigned long long count; /* Total number of samples. */
+ enum performance_units unit; /* Unit of following values. */
+ unsigned long long max; /* Maximum value. */
+ unsigned long long min; /* Minimum value. */
+ double pctl_95; /* 95th percentile. */
+ double ewma_50; /* Exponentially weighted moving average
(alpha 0.50). */
+ double ewma_1; /* Exponentially weighted moving average
(alpha 0.01). */
+};
+
/* Create a new performance measurement.
* The "units" are not used for any calculations but are printed when
* statistics are requested.
@@ -39,4 +49,7 @@ bool performance_start_sample(const char *name, unsigned long
long ts);
*/
bool performance_end_sample(const char *name, unsigned long long ts);
+/* Retrieve statistics calculated from collected samples */
+bool performance_get_stats(const char *name, struct performance_stats *stats);
+
#endif /* performance.h */
--
2.14.3
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