linux-kernel - [PATCH V2 20/23] perf stat: Add requires

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Date:   Fri,  6 May 2022 15:25:58 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Ian Rogers <irogers@...gle.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Leo Yan <leo.yan@...aro.org>, linux-kernel@...r.kernel.org
Subject: [PATCH V2 20/23] perf stat: Add requires_cpu flag for uncore

Uncore events require a CPU i.e. it cannot be -1.

The evsel system_wide flag is intended for events that should be on every
CPU, which does not make sense for uncore events because uncore events do
not map one-to-one with CPUs.

These 2 requirements are not exactly the same, so introduce a new flag
'requires_cpu' for the uncore case.

Acked-by: Ian Rogers <irogers@...gle.com>
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/lib/perf/evlist.c                 | 4 +++-
 tools/lib/perf/include/internal/evsel.h | 1 +
 tools/perf/builtin-stat.c               | 5 +----
 tools/perf/util/evsel.c                 | 1 +
 tools/perf/util/parse-events.c          | 2 +-
 5 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index f51fdb899d19..1c801f8da44f 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -43,7 +43,9 @@ static void __perf_evlist__propagate_maps(struct perf_evlist *evlist,
 	if (!evsel->own_cpus || evlist->has_user_cpus) {
 		perf_cpu_map__put(evsel->cpus);
 		evsel->cpus = perf_cpu_map__get(evlist->user_requested_cpus);
-	} else if (!evsel->system_wide && perf_cpu_map__empty(evlist->user_requested_cpus)) {
+	} else if (!evsel->system_wide &&
+		   !evsel->requires_cpu &&
+		   perf_cpu_map__empty(evlist->user_requested_cpus)) {
 		perf_cpu_map__put(evsel->cpus);
 		evsel->cpus = perf_cpu_map__get(evlist->user_requested_cpus);
 	} else if (evsel->cpus != evsel->own_cpus) {
diff --git a/tools/lib/perf/include/internal/evsel.h b/tools/lib/perf/include/internal/evsel.h
index cfc9ebd7968e..77fbb8b97e5c 100644
--- a/tools/lib/perf/include/internal/evsel.h
+++ b/tools/lib/perf/include/internal/evsel.h
@@ -50,6 +50,7 @@ struct perf_evsel {
 	/* parse modifier helper */
 	int			 nr_members;
 	bool			 system_wide;
+	bool			 requires_cpu;
 	int			 idx;
 };
 
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 1b96636df01e..c049533f74e4 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -385,9 +385,6 @@ static int read_counter_cpu(struct evsel *counter, struct timespec *rs, int cpu_
 	if (!counter->supported)
 		return -ENOENT;
 
-	if (counter->core.system_wide)
-		nthreads = 1;
-
 	for (thread = 0; thread < nthreads; thread++) {
 		struct perf_counts_values *count;
 
@@ -2264,7 +2261,7 @@ static void setup_system_wide(int forks)
 		struct evsel *counter;
 
 		evlist__for_each_entry(evsel_list, counter) {
-			if (!counter->core.system_wide &&
+			if (!counter->core.requires_cpu &&
 			    strcmp(counter->name, "duration_time")) {
 				return;
 			}
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index d38722560e80..12346293706b 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -382,6 +382,7 @@ struct evsel *evsel__clone(struct evsel *orig)
 	evsel->core.threads = perf_thread_map__get(orig->core.threads);
 	evsel->core.nr_members = orig->core.nr_members;
 	evsel->core.system_wide = orig->core.system_wide;
+	evsel->core.requires_cpu = orig->core.requires_cpu;
 
 	if (orig->name) {
 		evsel->name = strdup(orig->name);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 937f6c9434a2..5227174099b5 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -365,7 +365,7 @@ __add_event(struct list_head *list, int *idx,
 	(*idx)++;
 	evsel->core.cpus = cpus;
 	evsel->core.own_cpus = perf_cpu_map__get(cpus);
-	evsel->core.system_wide = pmu ? pmu->is_uncore : false;
+	evsel->core.requires_cpu = pmu ? pmu->is_uncore : false;
 	evsel->auto_merge_stats = auto_merge_stats;
 
 	if (name)
-- 
2.25.1