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Subject[PATCH v2 6/6] perf report: Print percentage of each event statistics
Date
It's sometimes useful to see how many samples vs other events in the
data file with percent values.

$ perf report --stat

Aggregated stats:
TOTAL events: 20064
MMAP events: 239 ( 1.2%)
COMM events: 1518 ( 7.6%)
EXIT events: 1 ( 0.0%)
FORK events: 1517 ( 7.6%)
SAMPLE events: 4015 (20.0%)
MMAP2 events: 12769 (63.6%)
FINISHED_ROUND events: 2 ( 0.0%)
THREAD_MAP events: 1 ( 0.0%)
CPU_MAP events: 1 ( 0.0%)
TIME_CONV events: 1 ( 0.0%)
cycles stats:
SAMPLE events: 2475
instructions stats:
SAMPLE events: 1540

Suggested-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/ui/stdio/hist.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index d9e634406175..f36270485168 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -902,6 +902,7 @@ size_t events_stats__fprintf(struct events_stats *stats, FILE *fp,
{
int i;
size_t ret = 0;
+ u32 total = stats->nr_events[0];

for (i = 0; i < PERF_RECORD_HEADER_MAX; ++i) {
const char *name;
@@ -912,7 +913,14 @@ size_t events_stats__fprintf(struct events_stats *stats, FILE *fp,
if (skip_empty && !stats->nr_events[i])
continue;

- ret += fprintf(fp, "%16s events: %10d\n", name, stats->nr_events[i]);
+ if (i && total) {
+ ret += fprintf(fp, "%16s events: %10d (%4.1f%%)\n",
+ name, stats->nr_events[i],
+ 100.0 * stats->nr_events[i] / total);
+ } else {
+ ret += fprintf(fp, "%16s events: %10d\n",
+ name, stats->nr_events[i]);
+ }
}

return ret;
--
2.31.1.527.g47e6f16901-goog
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