[PATCH v4 5/5] perf stat: Add topdown metrics in the default perf stat on the hybrid machine
From: zhengjun . xing
Date: Thu Jul 21 2022 - 02:56:58 EST
From: Zhengjun Xing <zhengjun.xing@xxxxxxxxxxxxxxx>
Topdown metrics are missed in the default perf stat on the hybrid machine,
add Topdown metrics in default perf stat for hybrid systems.
Currently, we support the perf metrics Topdown for the p-core PMU in the
perf stat default, the perf metrics Topdown support for e-core PMU will be
implemented later separately. Refactor the code adds two x86 specific
functions. Widen the size of the event name column by 7 chars, so that all
metrics after the "#" become aligned again.
The perf metrics topdown feature is supported on the cpu_core of ADL. The
dedicated perf metrics counter and the fixed counter 3 are used for the
topdown events. Adding the topdown metrics doesn't trigger multiplexing.
Before:
# ./perf stat -a true
Performance counter stats for 'system wide':
53.70 msec cpu-clock # 25.736 CPUs utilized
80 context-switches # 1.490 K/sec
24 cpu-migrations # 446.951 /sec
52 page-faults # 968.394 /sec
2,788,555 cpu_core/cycles/ # 51.931 M/sec
851,129 cpu_atom/cycles/ # 15.851 M/sec
2,974,030 cpu_core/instructions/ # 55.385 M/sec
416,919 cpu_atom/instructions/ # 7.764 M/sec
586,136 cpu_core/branches/ # 10.916 M/sec
79,872 cpu_atom/branches/ # 1.487 M/sec
14,220 cpu_core/branch-misses/ # 264.819 K/sec
7,691 cpu_atom/branch-misses/ # 143.229 K/sec
0.002086438 seconds time elapsed
After:
# ./perf stat -a true
Performance counter stats for 'system wide':
61.39 msec cpu-clock # 24.874 CPUs utilized
76 context-switches # 1.238 K/sec
24 cpu-migrations # 390.968 /sec
52 page-faults # 847.097 /sec
2,753,695 cpu_core/cycles/ # 44.859 M/sec
903,899 cpu_atom/cycles/ # 14.725 M/sec
2,927,529 cpu_core/instructions/ # 47.690 M/sec
428,498 cpu_atom/instructions/ # 6.980 M/sec
581,299 cpu_core/branches/ # 9.470 M/sec
83,409 cpu_atom/branches/ # 1.359 M/sec
13,641 cpu_core/branch-misses/ # 222.216 K/sec
8,008 cpu_atom/branch-misses/ # 130.453 K/sec
14,761,308 cpu_core/slots/ # 240.466 M/sec
3,288,625 cpu_core/topdown-retiring/ # 22.3% retiring
1,323,323 cpu_core/topdown-bad-spec/ # 9.0% bad speculation
5,477,470 cpu_core/topdown-fe-bound/ # 37.1% frontend bound
4,679,199 cpu_core/topdown-be-bound/ # 31.7% backend bound
646,194 cpu_core/topdown-heavy-ops/ # 4.4% heavy operations # 17.9% light operations
1,244,999 cpu_core/topdown-br-mispredict/ # 8.4% branch mispredict # 0.5% machine clears
3,891,800 cpu_core/topdown-fetch-lat/ # 26.4% fetch latency # 10.7% fetch bandwidth
1,879,034 cpu_core/topdown-mem-bound/ # 12.7% memory bound # 19.0% Core bound
0.002467839 seconds time elapsed
Signed-off-by: Zhengjun Xing <zhengjun.xing@xxxxxxxxxxxxxxx>
Reviewed-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
Change log:
v4:
* Adds Acked-by from Namhyung Kim <namhyung@xxxxxxxxxx>
v3:
* Make the pr_warning in one line.
v2:
* Refactor arch_get_topdown_pmu_name() as Namhyung's suggestion.
tools/perf/arch/x86/util/evlist.c | 13 ++------
tools/perf/arch/x86/util/topdown.c | 51 ++++++++++++++++++++++++++++++
tools/perf/arch/x86/util/topdown.h | 1 +
tools/perf/builtin-stat.c | 14 ++------
tools/perf/util/stat-display.c | 2 +-
tools/perf/util/topdown.c | 7 ++++
tools/perf/util/topdown.h | 3 +-
7 files changed, 66 insertions(+), 25 deletions(-)
diff --git a/tools/perf/arch/x86/util/evlist.c b/tools/perf/arch/x86/util/evlist.c
index c83f8c11735f..cb59ce9b9638 100644
--- a/tools/perf/arch/x86/util/evlist.c
+++ b/tools/perf/arch/x86/util/evlist.c
@@ -3,12 +3,9 @@
#include "util/pmu.h"
#include "util/evlist.h"
#include "util/parse-events.h"
-#include "topdown.h"
#include "util/event.h"
#include "util/pmu-hybrid.h"
-
-#define TOPDOWN_L1_EVENTS "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound}"
-#define TOPDOWN_L2_EVENTS "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound,topdown-heavy-ops,topdown-br-mispredict,topdown-fetch-lat,topdown-mem-bound}"
+#include "topdown.h"
static int ___evlist__add_default_attrs(struct evlist *evlist,
struct perf_event_attr *attrs,
@@ -65,13 +62,7 @@ int arch_evlist__add_default_attrs(struct evlist *evlist,
if (nr_attrs)
return ___evlist__add_default_attrs(evlist, attrs, nr_attrs);
- if (!pmu_have_event("cpu", "slots"))
- return 0;
-
- if (pmu_have_event("cpu", "topdown-heavy-ops"))
- return parse_events(evlist, TOPDOWN_L2_EVENTS, NULL);
- else
- return parse_events(evlist, TOPDOWN_L1_EVENTS, NULL);
+ return topdown_parse_events(evlist);
}
struct evsel *arch_evlist__leader(struct list_head *list)
diff --git a/tools/perf/arch/x86/util/topdown.c b/tools/perf/arch/x86/util/topdown.c
index f81a7cfe4d63..67c524324125 100644
--- a/tools/perf/arch/x86/util/topdown.c
+++ b/tools/perf/arch/x86/util/topdown.c
@@ -3,9 +3,17 @@
#include "api/fs/fs.h"
#include "util/pmu.h"
#include "util/topdown.h"
+#include "util/evlist.h"
+#include "util/debug.h"
+#include "util/pmu-hybrid.h"
#include "topdown.h"
#include "evsel.h"
+#define TOPDOWN_L1_EVENTS "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound}"
+#define TOPDOWN_L1_EVENTS_CORE "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/}"
+#define TOPDOWN_L2_EVENTS "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound,topdown-heavy-ops,topdown-br-mispredict,topdown-fetch-lat,topdown-mem-bound}"
+#define TOPDOWN_L2_EVENTS_CORE "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/,cpu_core/topdown-heavy-ops/,cpu_core/topdown-br-mispredict/,cpu_core/topdown-fetch-lat/,cpu_core/topdown-mem-bound/}"
+
/* Check whether there is a PMU which supports the perf metrics. */
bool topdown_sys_has_perf_metrics(void)
{
@@ -73,3 +81,46 @@ bool arch_topdown_sample_read(struct evsel *leader)
return false;
}
+
+const char *arch_get_topdown_pmu_name(struct evlist *evlist, bool warn)
+{
+ const char *pmu_name;
+
+ if (!perf_pmu__has_hybrid())
+ return "cpu";
+
+ if (!evlist->hybrid_pmu_name) {
+ if (warn)
+ pr_warning("WARNING: default to use cpu_core topdown events\n");
+ evlist->hybrid_pmu_name = perf_pmu__hybrid_type_to_pmu("core");
+ }
+
+ pmu_name = evlist->hybrid_pmu_name;
+
+ return pmu_name;
+}
+
+int topdown_parse_events(struct evlist *evlist)
+{
+ const char *topdown_events;
+ const char *pmu_name;
+
+ if (!topdown_sys_has_perf_metrics())
+ return 0;
+
+ pmu_name = arch_get_topdown_pmu_name(evlist, false);
+
+ if (pmu_have_event(pmu_name, "topdown-heavy-ops")) {
+ if (!strcmp(pmu_name, "cpu_core"))
+ topdown_events = TOPDOWN_L2_EVENTS_CORE;
+ else
+ topdown_events = TOPDOWN_L2_EVENTS;
+ } else {
+ if (!strcmp(pmu_name, "cpu_core"))
+ topdown_events = TOPDOWN_L1_EVENTS_CORE;
+ else
+ topdown_events = TOPDOWN_L1_EVENTS;
+ }
+
+ return parse_events(evlist, topdown_events, NULL);
+}
diff --git a/tools/perf/arch/x86/util/topdown.h b/tools/perf/arch/x86/util/topdown.h
index 46bf9273e572..7eb81f042838 100644
--- a/tools/perf/arch/x86/util/topdown.h
+++ b/tools/perf/arch/x86/util/topdown.h
@@ -3,5 +3,6 @@
#define _TOPDOWN_H 1
bool topdown_sys_has_perf_metrics(void);
+int topdown_parse_events(struct evlist *evlist);
#endif
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 837c3ca91af1..c6b68be78f8c 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -71,6 +71,7 @@
#include "util/bpf_counter.h"
#include "util/iostat.h"
#include "util/pmu-hybrid.h"
+ #include "util/topdown.h"
#include "asm/bug.h"
#include <linux/time64.h>
@@ -1858,22 +1859,11 @@ static int add_default_attributes(void)
unsigned int max_level = 1;
char *str = NULL;
bool warn = false;
- const char *pmu_name = "cpu";
+ const char *pmu_name = arch_get_topdown_pmu_name(evsel_list, true);
if (!force_metric_only)
stat_config.metric_only = true;
- if (perf_pmu__has_hybrid()) {
- if (!evsel_list->hybrid_pmu_name) {
- pr_warning("WARNING: default to use cpu_core topdown events\n");
- evsel_list->hybrid_pmu_name = perf_pmu__hybrid_type_to_pmu("core");
- }
-
- pmu_name = evsel_list->hybrid_pmu_name;
- if (!pmu_name)
- return -1;
- }
-
if (pmu_have_event(pmu_name, topdown_metric_L2_attrs[5])) {
metric_attrs = topdown_metric_L2_attrs;
max_level = 2;
diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index 606f09b09226..44045565c8f8 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -374,7 +374,7 @@ static void abs_printout(struct perf_stat_config *config,
config->csv_output ? 0 : config->unit_width,
evsel->unit, config->csv_sep);
- fprintf(output, "%-*s", config->csv_output ? 0 : 25, evsel__name(evsel));
+ fprintf(output, "%-*s", config->csv_output ? 0 : 32, evsel__name(evsel));
print_cgroup(config, evsel);
}
diff --git a/tools/perf/util/topdown.c b/tools/perf/util/topdown.c
index a369f84ceb6a..1090841550f7 100644
--- a/tools/perf/util/topdown.c
+++ b/tools/perf/util/topdown.c
@@ -65,3 +65,10 @@ __weak bool arch_topdown_sample_read(struct evsel *leader __maybe_unused)
{
return false;
}
+
+__weak const char *arch_get_topdown_pmu_name(struct evlist *evlist
+ __maybe_unused,
+ bool warn __maybe_unused)
+{
+ return "cpu";
+}
diff --git a/tools/perf/util/topdown.h b/tools/perf/util/topdown.h
index 118e75281f93..f9531528c559 100644
--- a/tools/perf/util/topdown.h
+++ b/tools/perf/util/topdown.h
@@ -2,11 +2,12 @@
#ifndef TOPDOWN_H
#define TOPDOWN_H 1
#include "evsel.h"
+#include "evlist.h"
bool arch_topdown_check_group(bool *warn);
void arch_topdown_group_warn(void);
bool arch_topdown_sample_read(struct evsel *leader);
-
+const char *arch_get_topdown_pmu_name(struct evlist *evlist, bool warn);
int topdown_filter_events(const char **attr, char **str, bool use_group,
const char *pmu_name);
--
2.25.1