Commit-ID: ffe4f3c0d109dc53e1b3448ac457052107f34a84
Gitweb: http://git.kernel.org/tip/ffe4f3c0d109dc53e1b3448ac457052107f34a84
Author: David Ahern <dsahern@xxxxxxxxx>
AuthorDate: Fri, 2 Aug 2013 14:05:40 -0600
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 7 Aug 2013 17:35:26 -0300
perf stats: Add max and min stats
Need an initialization function to set min to -1 to
differentiate from an actual min of 0.
Signed-off-by: David Ahern <dsahern@xxxxxxxxx>
Reviewed-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Runzhen Wang <runzhen@xxxxxxxxxxxxxxxxxx>
Cc: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1375473947-64285-3-git-send-email-dsahern@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/stat.c | 6 ++++++
tools/perf/util/stat.h | 9 +++++++++
2 files changed, 15 insertions(+)
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 7c59c28..6506b3d 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -10,6 +10,12 @@ void update_stats(struct stats *stats, u64 val)
delta = val - stats->mean;
stats->mean += delta / stats->n;
stats->M2 += delta*(val - stats->mean);
+
+ if (val > stats->max)
+ stats->max = val;
+
+ if (val < stats->min)
+ stats->min = val;
}
double avg_stats(struct stats *stats)
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index 588367c..ae8ccd7 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -6,6 +6,7 @@
struct stats
{
double n, mean, M2;
+ u64 max, min;
};
void update_stats(struct stats *stats, u64 val);
@@ -13,4 +14,12 @@ 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
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