[PATCH 15/19] perf stat: Add perf_stat_process_percore()

From: Namhyung Kim
Date: Mon Oct 10 2022 - 01:37:31 EST


The perf_stat_process_percore() is to aggregate counts for an event per-core
even if the aggr_mode is AGGR_NONE. This is enabled when user requested it
on the command line.

To handle that, it keeps the per-cpu counts at first. And then it aggregates
the counts that have the same core id in the aggr->counts and updates the
values for each cpu back.

Later, per-core events will skip one of the CPUs unless percore-show-thread
option is given. In that case, it can simply print all cpu stats with the
updated (per-core) values.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
tools/perf/builtin-stat.c | 1 +
tools/perf/util/stat.c | 71 +++++++++++++++++++++++++++++++++++++++
tools/perf/util/stat.h | 2 ++
3 files changed, 74 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index f90e8f29cb23..c127e784a7be 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -488,6 +488,7 @@ static void process_counters(void)
}

perf_stat_merge_counters(&stat_config, evsel_list);
+ perf_stat_process_percore(&stat_config, evsel_list);
}

static void process_interval(void)
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 1bb197782a34..d788d0e85204 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -671,6 +671,77 @@ void perf_stat_merge_counters(struct perf_stat_config *config, struct evlist *ev
evsel__merge_stats(evsel, config);
}

+static void evsel__update_percore_stats(struct evsel *evsel, struct aggr_cpu_id *core_id)
+{
+ struct perf_stat_evsel *ps = evsel->stats;
+ struct perf_counts_values counts = { 0, };
+ struct aggr_cpu_id id;
+ struct perf_cpu cpu;
+ int idx;
+
+ /* collect per-core counts */
+ perf_cpu_map__for_each_cpu(cpu, idx, evsel->core.cpus) {
+ struct perf_stat_aggr *aggr = &ps->aggr[idx];
+
+ id = aggr_cpu_id__core(cpu, NULL);
+ if (!aggr_cpu_id__equal(core_id, &id))
+ continue;
+
+ counts.val += aggr->counts.val;
+ counts.ena += aggr->counts.ena;
+ counts.run += aggr->counts.run;
+ }
+
+ /* update aggregated per-core counts for each CPU */
+ perf_cpu_map__for_each_cpu(cpu, idx, evsel->core.cpus) {
+ struct perf_stat_aggr *aggr = &ps->aggr[idx];
+
+ id = aggr_cpu_id__core(cpu, NULL);
+ if (!aggr_cpu_id__equal(core_id, &id))
+ continue;
+
+ aggr->counts.val = counts.val;
+ aggr->counts.ena = counts.ena;
+ aggr->counts.run = counts.run;
+
+ aggr->used = true;
+ }
+}
+
+/* we have an aggr_map for cpu, but want to aggregate the counters per-core */
+static void evsel__process_percore(struct evsel *evsel)
+{
+ struct perf_stat_evsel *ps = evsel->stats;
+ struct aggr_cpu_id core_id;
+ struct perf_cpu cpu;
+ int idx;
+
+ if (!evsel->percore)
+ return;
+
+ perf_cpu_map__for_each_cpu(cpu, idx, evsel->core.cpus) {
+ struct perf_stat_aggr *aggr = &ps->aggr[idx];
+
+ if (aggr->used)
+ continue;
+
+ core_id = aggr_cpu_id__core(cpu, NULL);
+ evsel__update_percore_stats(evsel, &core_id);
+ }
+}
+
+/* process cpu stats on per-core events */
+void perf_stat_process_percore(struct perf_stat_config *config, struct evlist *evlist)
+{
+ struct evsel *evsel;
+
+ if (config->aggr_mode != AGGR_NONE)
+ return;
+
+ evlist__for_each_entry(evlist, evsel)
+ evsel__process_percore(evsel);
+}
+
int perf_event__process_stat_event(struct perf_session *session,
union perf_event *event)
{
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index 12cc60ab04e4..ac85ed46aa59 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -46,6 +46,7 @@ enum perf_stat_evsel_id {
struct perf_stat_aggr {
struct perf_counts_values counts;
int nr;
+ bool used;
bool failed;
};

@@ -271,6 +272,7 @@ void evlist__reset_aggr_stats(struct evlist *evlist);
int perf_stat_process_counter(struct perf_stat_config *config,
struct evsel *counter);
void perf_stat_merge_counters(struct perf_stat_config *config, struct evlist *evlist);
+void perf_stat_process_percore(struct perf_stat_config *config, struct evlist *evlist);

struct perf_tool;
union perf_event;
--
2.38.0.rc1.362.ged0d419d3c-goog