[PATCH v6 3/5] perf stat: Copy counts from prev_raw_counts to evsel->counts

Jin Yao
2020-05-20T04:29:55Z

It would be useful to support the overall statistics for perf-stat
interval mode. For example, report the summary at the end of
"perf-stat -I" output.

But since perf-stat can support many aggregation modes, such as
--per-thread, --per-socket, -M and etc, we need a solution which
doesn't bring much complexity.

The idea is to use 'evsel->prev_raw_counts' which is updated in
each interval and it's saved with the latest counts. Before reporting
the summary, we copy the counts from evsel->prev_raw_counts to
evsel->counts, and next we just follow non-interval processing.

v5:
---
Don't save the previous aggr value to the member of [cpu0,thread0]
in perf_counts. Originally that was a trick because the
perf_stat_process_counter would create aggr values from per cpu
values. But we don't need to do that all the time. We will
handle it in next patch.

v4:
---
Change the commit message.
No functional change.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/util/stat.c | 24 ++++++++++++++++++++++++
tools/perf/util/stat.h | 1 +
2 files changed, 25 insertions(+)

diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index e397815f0dfb..aadc723ce871 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -225,6 +225,30 @@ void perf_evlist__reset_prev_raw_counts(struct evlist *evlist)
evsel__reset_prev_raw_counts(evsel);
}

+static void perf_evsel__copy_prev_raw_counts(struct evsel *evsel)
+{
+ int ncpus = evsel__nr_cpus(evsel);
+ int nthreads = perf_thread_map__nr(evsel->core.threads);
+
+ for (int thread = 0; thread < nthreads; thread++) {
+ for (int cpu = 0; cpu < ncpus; cpu++) {
+ *perf_counts(evsel->counts, cpu, thread) =
+ *perf_counts(evsel->prev_raw_counts, cpu,
+ thread);
+ }
+ }
+
+ evsel->counts->aggr = evsel->prev_raw_counts->aggr;
+}
+
+void perf_evlist__copy_prev_raw_counts(struct evlist *evlist)
+{
+ struct evsel *evsel;
+
+ evlist__for_each_entry(evlist, evsel)
+ perf_evsel__copy_prev_raw_counts(evsel);
+}
+
static void zero_per_pkg(struct evsel *counter)
{
if (counter->per_pkg_mask)
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index b4fdfaa7f2c0..62cf72c71869 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -198,6 +198,7 @@ int perf_evlist__alloc_stats(struct evlist *evlist, bool alloc_raw);
void perf_evlist__free_stats(struct evlist *evlist);
void perf_evlist__reset_stats(struct evlist *evlist);
void perf_evlist__reset_prev_raw_counts(struct evlist *evlist);
+void perf_evlist__copy_prev_raw_counts(struct evlist *evlist);

int perf_stat_process_counter(struct perf_stat_config *config,
struct evsel *counter);
--
2.17.1