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Message-ID: <20250918063944.16331-2-namhyung@kernel.org>
Date: Wed, 17 Sep 2025 23:39:44 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Kan Liang <kan.liang@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>,
linux-perf-users@...r.kernel.org
Subject: [RFC/PATCH 2/2] perf check: Add 'pmu' subcommand
The 'perf check pmu' command will show information about PMUs in the
system like below:
$ perf check pmu | head
cpu_atom: type = 10
core PMU: cpus = 16-27
caps: branches = 32
caps: max_precise = 3
caps: pmu_name = alderlake_hybrid
cpu_core: type = 4
core PMU: cpus = 0-15
caps: branches = 32
caps: max_precise = 3
caps: pmu_name = alderlake_hybrid
The -q option will make it print the name and type of PMUs only. It
also takes arguments to show matching PMUs only.
$ perf check pmu -q uncore
uncore_arb_0: type = 27
uncore_arb_1: type = 28
uncore_cbox_0: type = 15
uncore_cbox_1: type = 16
uncore_cbox_2: type = 17
uncore_cbox_3: type = 18
uncore_cbox_4: type = 19
uncore_cbox_5: type = 20
uncore_cbox_6: type = 21
uncore_cbox_7: type = 22
uncore_cbox_8: type = 23
uncore_cbox_9: type = 24
uncore_cbox_10: type = 25
uncore_cbox_11: type = 26
uncore_clock: type = 29
uncore_imc_free_running_0: type = 32
uncore_imc_free_running_1: type = 33
uncore_imc_0: type = 30
uncore_imc_1: type = 31
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/perf/Documentation/perf-check.txt | 12 +++++
tools/perf/builtin-check.c | 60 ++++++++++++++++++++++++-
2 files changed, 71 insertions(+), 1 deletion(-)
diff --git a/tools/perf/Documentation/perf-check.txt b/tools/perf/Documentation/perf-check.txt
index 34dccc29d90d2fdf..2fa007698c0f0814 100644
--- a/tools/perf/Documentation/perf-check.txt
+++ b/tools/perf/Documentation/perf-check.txt
@@ -11,6 +11,7 @@ SYNOPSIS
'perf check' [<options>]
'perf check' {feature <feature_list>} [<options>]
'perf check' {system <setting_list>} [<options>]
+'perf check' {pmu <name_list>} [<options>]
DESCRIPTION
-----------
@@ -26,6 +27,9 @@ is built-in, otherwise returns with exit status 1.
If the subcommand 'system' is used, then system settins are printed on
the standard output with explanation.
+If the subcommand 'pmu' is used, then available PMU information is printed
+on the standard output with explanation.
+
SUBCOMMANDS
-----------
@@ -88,6 +92,14 @@ SUBCOMMANDS
nmi_watchdog
kptr_restrict
+pmu::
+
+ Print PMU information available in the system.
+
+ Example Usage:
+ perf check pmu
+ perf check pmu <name>
+
OPTIONS
-------
diff --git a/tools/perf/builtin-check.c b/tools/perf/builtin-check.c
index 1c7c6bb5da5ccbf2..f3d034a94b1227c7 100644
--- a/tools/perf/builtin-check.c
+++ b/tools/perf/builtin-check.c
@@ -3,6 +3,8 @@
#include "color.h"
#include "util/debug.h"
#include "util/header.h"
+#include "util/pmu.h"
+#include "util/pmus.h"
#include <api/fs/fs.h>
#include <tools/config.h>
#include <stdbool.h>
@@ -10,13 +12,14 @@
#include <string.h>
#include <subcmd/parse-options.h>
-static const char * const check_subcommands[] = { "feature", "system", NULL };
+static const char * const check_subcommands[] = { "feature", "system", "pmu", NULL };
static struct option check_options[] = {
OPT_BOOLEAN('q', "quiet", &quiet, "do not show any warnings or messages"),
OPT_END()
};
static struct option check_feature_options[] = { OPT_PARENT(check_options) };
static struct option check_system_options[] = { OPT_PARENT(check_options) };
+static struct option check_pmu_options[] = { OPT_PARENT(check_options) };
static const char *check_usage[] = { NULL, NULL };
static const char *check_feature_usage[] = {
@@ -27,6 +30,10 @@ static const char *check_system_usage[] = {
"perf check system",
NULL
};
+static const char *check_pmu_usage[] = {
+ "perf check pmu",
+ NULL
+};
#define FEATURE_STATUS(name_, macro_) { \
.name = name_, \
@@ -278,6 +285,55 @@ static int subcommand_system(int argc, const char **argv)
return 0;
}
+/**
+ * Usage: 'perf check pmu <names>'
+ *
+ * Show PMU information.
+ */
+static int subcommand_pmu(int argc, const char **argv)
+{
+ struct perf_pmu *pmu = NULL;
+ struct perf_pmu_caps *caps;
+
+ argc = parse_options(argc, argv, check_pmu_options, check_pmu_usage, 0);
+
+ while ((pmu = perf_pmus__scan(pmu)) != NULL) {
+ if (argc) {
+ bool found = false;
+
+ /* only show entries match to command line arguments */
+ for (int k = 0; k < argc; k++) {
+ if (strstr(pmu->name, argv[k])) {
+ found = true;
+ break;
+ }
+ }
+ if (!found)
+ continue;
+ }
+
+ printf("%s: type = %u\n", pmu->name, pmu->type);
+ if (quiet)
+ continue;
+
+ if (pmu->is_core || pmu->is_uncore) {
+ printf(" %score PMU", pmu->is_uncore ? "un" : "");
+ if (!perf_cpu_map__is_empty(pmu->cpus)) {
+ printf(": %s = ", pmu->is_core ? "cpus" : "cpumask");
+ cpu_map__fprintf(pmu->cpus, stdout);
+ } else {
+ printf("\n");
+ }
+ }
+
+ perf_pmu__caps_parse(pmu);
+ list_for_each_entry(caps, &pmu->caps, list) {
+ printf(" caps: %s = %s\n", caps->name, caps->value);
+ }
+ }
+ return 0;
+}
+
int cmd_check(int argc, const char **argv)
{
argc = parse_options_subcommand(argc, argv, check_options,
@@ -290,6 +346,8 @@ int cmd_check(int argc, const char **argv)
return subcommand_feature(argc, argv);
if (strcmp(argv[0], "system") == 0)
return subcommand_system(argc, argv);
+ if (strcmp(argv[0], "pmu") == 0)
+ return subcommand_pmu(argc, argv);
/* If no subcommand matched above, print usage help */
pr_err("Unknown subcommand: %s\n", argv[0]);
--
2.51.0
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