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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /tools/perf/util/stat.h
Initial import
Diffstat (limited to 'tools/perf/util/stat.h')
-rw-r--r--tools/perf/util/stat.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
new file mode 100644
index 000000000..5667fc3e3
--- /dev/null
+++ b/tools/perf/util/stat.h
@@ -0,0 +1,25 @@
+#ifndef __PERF_STATS_H
+#define __PERF_STATS_H
+
+#include <linux/types.h>
+
+struct stats
+{
+ double n, mean, M2;
+ u64 max, min;
+};
+
+void update_stats(struct stats *stats, u64 val);
+double avg_stats(struct stats *stats);
+double stddev_stats(struct stats *stats);
+double rel_stddev_stats(double stddev, double avg);
+
+static inline void init_stats(struct stats *stats)
+{
+ stats->n = 0.0;
+ stats->mean = 0.0;
+ stats->M2 = 0.0;
+ stats->min = (u64) -1;
+ stats->max = 0;
+}
+#endif