[PATCH 11/11] perf stat: Add support for snapshot counters

From: Jiri Olsa
Date: Fri Nov 21 2014 - 04:32:52 EST

The .snapshot file indicates that the provided event value is a
snapshot value. Bypassing the delta computation logic for such

Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Matt Fleming <matt.fleming@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
tools/perf/builtin-stat.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 860e8ad06616..891086376381 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -443,7 +443,8 @@ static int read_cb(struct perf_evsel *evsel, int cpu, int thread __maybe_unused,
- perf_evsel__compute_deltas(evsel, cpu, count);
+ if (!evsel->snapshot)
+ perf_evsel__compute_deltas(evsel, cpu, count);
perf_counts_values__scale(count, scale, NULL);
evsel->counts->cpu[cpu] = *count;
update_shadow_stats(evsel, count->values);
@@ -479,7 +480,8 @@ static int read_counter_aggr(struct perf_evsel *counter)
if (read_counter(counter))
return -1;

- perf_evsel__compute_deltas(counter, -1, aggr);
+ if (!counter->snapshot)
+ perf_evsel__compute_deltas(counter, -1, aggr);
perf_counts_values__scale(aggr, scale, &counter->counts->scaled);

for (i = 0; i < 3; i++)

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