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Commit ffe4f3c0 authored by David Ahern's avatar David Ahern Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarDavid Ahern <dsahern@gmail.com>
Reviewed-by: default avatarXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com>
Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1375473947-64285-3-git-send-email-dsahern@gmail.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 42ee8c61

tools/perf/util/stat.c

+6 −0
Original line number Diff line number Diff line
@@ -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)

tools/perf/util/stat.h

+9 −0
Original line number Diff line number Diff line
@@ -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