[PATCH 31/49] perf stat: Hybrid evsel uses its own cpus

From: kan . liang
Date: Mon Feb 08 2021 - 13:21:41 EST

From: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>

On hybrid platform, atom events can be only enabled on atom CPUs. Core
events can be only enabled on core CPUs. So for a hybrid event, it can
be only enabled on it's own CPUs.

But what the problem for current perf is, the cpus for evsel
(via PMU sysfs) have been merged to evsel_list->core.all_cpus.
It might be all CPUs.

So we need to figure out one way to let the hybrid event only use it's
own CPUs.

The idea is to create a new evlist__invalidate_all_cpus to invalidate
the evsel_list->core.all_cpus then evlist__for_each_cpu returns cpu -1
for hybrid evsel. If cpu is -1, hybrid evsel will use it's own cpus.

We will see following code piece in patch.

if (cpu == -1 && !evlist->thread_mode)
evsel__enable_cpus(pos);

It lets the event be only enabled on event's own cpus.

Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
---
tools/perf/builtin-stat.c | 37 ++++++++++++++++++++++--
tools/perf/util/evlist.c | 72 ++++++++++++++++++++++++++++++++++++++++++++---
tools/perf/util/evlist.h | 4 +++
tools/perf/util/evsel.h | 8 ++++++
4 files changed, 115 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index bc84b31..afb8789 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -392,6 +392,18 @@ static int read_counter_cpu(struct evsel *counter, struct timespec *rs, int cpu)
return 0;
}

+static int read_counter_cpus(struct evsel *counter, struct timespec *rs)
+{
+ int cpu, nr_cpus, err = 0;
+ struct perf_cpu_map *cpus = evsel__cpus(counter);
+
+ nr_cpus = cpus ? cpus->nr : 1;
+ for (cpu = 0; cpu < nr_cpus; cpu++)
+ err = read_counter_cpu(counter, rs, cpu);
+
+ return err;
+}
+
static int read_affinity_counters(struct timespec *rs)
{
struct evsel *counter;
@@ -413,8 +425,14 @@ static int read_affinity_counters(struct timespec *rs)
if (evsel__cpu_iter_skip(counter, cpu))
continue;
if (!counter->err) {
- counter->err = read_counter_cpu(counter, rs,
- counter->cpu_iter - 1);
+ if (cpu == -1 && !evsel_list->thread_mode) {
+ counter->err = read_counter_cpus(counter, rs);
+ } else if (evsel_list->thread_mode) {
+ counter->err = read_counter_cpu(counter, rs, 0);
+ } else {
+ counter->err = read_counter_cpu(counter, rs,
+ counter->cpu_iter - 1);
+ }
}
}
}
@@ -747,6 +765,21 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
if (group)
evlist__set_leader(evsel_list);

+ /*
+ * On hybrid platform, the cpus for evsel (via PMU sysfs) have been
+ * merged to evsel_list->core.all_cpus. We use evlist__invalidate_all_cpus
+ * to invalidate the evsel_list->core.all_cpus then evlist__for_each_cpu
+ * returns cpu -1 for hybrid evsel. If cpu is -1, hybrid evsel will
+ * use it's own cpus.
+ */
+ if (evlist__has_hybrid_events(evsel_list)) {
+ evlist__invalidate_all_cpus(evsel_list);
+ if (!target__has_cpu(&target) ||
+ target__has_per_thread(&target)) {
+ evsel_list->thread_mode = true;
+ }
+ }
+
if (affinity__setup(&affinity) < 0)
return -1;

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 05363a7..626a0e7 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -375,7 +375,8 @@ bool evsel__cpu_iter_skip_no_inc(struct evsel *ev, int cpu)
bool evsel__cpu_iter_skip(struct evsel *ev, int cpu)
{
if (!evsel__cpu_iter_skip_no_inc(ev, cpu)) {
- ev->cpu_iter++;
+ if (cpu != -1)
+ ev->cpu_iter++;
return false;
}
return true;
@@ -404,6 +405,16 @@ static int evlist__is_enabled(struct evlist *evlist)
return false;
}

+static void evsel__disable_cpus(struct evsel *evsel)
+{
+ int cpu, nr_cpus;
+ struct perf_cpu_map *cpus = evsel__cpus(evsel);
+
+ nr_cpus = cpus ? cpus->nr : 1;
+ for (cpu = 0; cpu < nr_cpus; cpu++)
+ evsel__disable_cpu(evsel, cpu);
+}
+
static void __evlist__disable(struct evlist *evlist, char *evsel_name)
{
struct evsel *pos;
@@ -430,7 +441,12 @@ static void __evlist__disable(struct evlist *evlist, char *evsel_name)
has_imm = true;
if (pos->immediate != imm)
continue;
- evsel__disable_cpu(pos, pos->cpu_iter - 1);
+ if (cpu == -1 && !evlist->thread_mode)
+ evsel__disable_cpus(pos);
+ else if (evlist->thread_mode)
+ evsel__disable_cpu(pos, 0);
+ else
+ evsel__disable_cpu(pos, pos->cpu_iter - 1);
}
}
if (!has_imm)
@@ -466,6 +482,15 @@ void evlist__disable_evsel(struct evlist *evlist, char *evsel_name)
__evlist__disable(evlist, evsel_name);
}

+static void evsel__enable_cpus(struct evsel *evsel)
+{
+ int cpu, nr_cpus;
+ struct perf_cpu_map *cpus = evsel__cpus(evsel);
+
+ nr_cpus = cpus ? cpus->nr : 1;
+ for (cpu = 0; cpu < nr_cpus; cpu++)
+ evsel__enable_cpu(evsel, cpu);
+}
static void __evlist__enable(struct evlist *evlist, char *evsel_name)
{
struct evsel *pos;
@@ -485,7 +510,12 @@ static void __evlist__enable(struct evlist *evlist, char *evsel_name)
continue;
if (!evsel__is_group_leader(pos) || !pos->core.fd)
continue;
- evsel__enable_cpu(pos, pos->cpu_iter - 1);
+ if (cpu == -1 && !evlist->thread_mode)
+ evsel__enable_cpus(pos);
+ else if (evlist->thread_mode)
+ evsel__enable_cpu(pos, 0);
+ else
+ evsel__enable_cpu(pos, pos->cpu_iter - 1);
}
}
affinity__cleanup(&affinity);
@@ -1260,6 +1290,16 @@ void evlist__set_selected(struct evlist *evlist, struct evsel *evsel)
evlist->selected = evsel;
}

+static void evsel__close_cpus(struct evsel *evsel)
+{
+ int cpu, nr_cpus;
+ struct perf_cpu_map *cpus = evsel__cpus(evsel);
+
+ nr_cpus = cpus ? cpus->nr : 1;
+ for (cpu = 0; cpu < nr_cpus; cpu++)
+ perf_evsel__close_cpu(&evsel->core, cpu);
+}
+
void evlist__close(struct evlist *evlist)
{
struct evsel *evsel;
@@ -1284,7 +1324,13 @@ void evlist__close(struct evlist *evlist)
evlist__for_each_entry_reverse(evlist, evsel) {
if (evsel__cpu_iter_skip(evsel, cpu))
continue;
- perf_evsel__close_cpu(&evsel->core, evsel->cpu_iter - 1);
+
+ if (cpu == -1 && !evlist->thread_mode)
+ evsel__close_cpus(evsel);
+ else if (evlist->thread_mode)
+ perf_evsel__close_cpu(&evsel->core, 0);
+ else
+ perf_evsel__close_cpu(&evsel->core, evsel->cpu_iter - 1);
}
}
affinity__cleanup(&affinity);
@@ -2010,3 +2056,21 @@ struct evsel *evlist__find_evsel(struct evlist *evlist, int idx)
}
return NULL;
}
+
+bool evlist__has_hybrid_events(struct evlist *evlist)
+{
+ struct evsel *evsel;
+
+ evlist__for_each_entry(evlist, evsel) {
+ if (evsel__is_hybrid_event(evsel))
+ return true;
+ }
+
+ return false;
+}
+
+void evlist__invalidate_all_cpus(struct evlist *evlist)
+{
+ perf_cpu_map__put(evlist->core.all_cpus);
+ evlist->core.all_cpus = perf_cpu_map__empty_new(1);
+}
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 1aae758..9741df4 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -52,6 +52,7 @@ struct evlist {
struct perf_evlist core;
int nr_groups;
bool enabled;
+ bool thread_mode;
int id_pos;
int is_pos;
u64 combined_sample_type;
@@ -353,4 +354,7 @@ int evlist__ctlfd_ack(struct evlist *evlist);
#define EVLIST_DISABLED_MSG "Events disabled\n"

struct evsel *evlist__find_evsel(struct evlist *evlist, int idx);
+void evlist__invalidate_all_cpus(struct evlist *evlist);
+
+bool evlist__has_hybrid_events(struct evlist *evlist);
#endif /* __PERF_EVLIST_H */
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 5c161a2..4eb054a 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -7,9 +7,11 @@
#include <sys/types.h>
#include <linux/perf_event.h>
#include <linux/types.h>
+#include <string.h>
#include <internal/evsel.h>
#include <perf/evsel.h>
#include "symbol_conf.h"
+#include "pmu.h"
#include <internal/cpumap.h>

struct bpf_object;
@@ -427,4 +429,10 @@ static inline bool evsel__is_dummy_event(struct evsel *evsel)
struct perf_env *evsel__env(struct evsel *evsel);

int evsel__store_ids(struct evsel *evsel, struct evlist *evlist);
+
+static inline bool evsel__is_hybrid_event(struct evsel *evsel)
+{
+ return evsel->pmu_name && perf_pmu__is_hybrid(evsel->pmu_name);
+}
+
#endif /* __PERF_EVSEL_H */
--
2.7.4