[PATCH 33/47] perf stat record: Write stat events on record

Jiri Olsa
2015-07-21T12:37:21Z

Writing stat events on 'perf stat record' at the time
we read counter values from kernel.

Link: http://lkml.kernel.org/n/tip-ojc826gy0x9jj74elbjfccej@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/builtin-stat.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index d6ba710e7358..49948be5680f 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -204,6 +204,18 @@ static int process_synthesized_event(struct perf_tool *tool __maybe_unused,
return 0;
}

+#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
+
+static int
+perf_evsel__write_stat_event(struct perf_evsel *counter, u32 cpu, u32 thread,
+ struct perf_counts_values *count)
+{
+ struct perf_sample_id *sid = SID(counter, cpu, thread);
+
+ return perf_event__synthesize_stat(NULL, cpu, thread, sid->id, count,
+ process_synthesized_event, NULL);
+}
+
/*
* Read out the results of a single counter:
* do not aggregate counts across CPUs in system-wide mode
@@ -227,6 +239,13 @@ static int read_counter(struct perf_evsel *counter)
count = perf_counts(counter->counts, cpu, thread);
if (perf_evsel__read(counter, cpu, thread, count))
return -1;
+
+ if (STAT_RECORD) {
+ if (perf_evsel__write_stat_event(counter, cpu, thread, count)) {
+ pr_err("failed to write stat event\n");
+ return -1;
+ }
+ }
}
}

--
2.4.3