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Message-ID: <20250627192417.1157736-2-irogers@google.com>
Date: Fri, 27 Jun 2025 12:24:06 -0700
From: Ian Rogers <irogers@...gle.com>
To: Thomas Falcon <thomas.falcon@...el.com>, Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>, Ben Gainey <ben.gainey@....com>,
James Clark <james.clark@...aro.org>, Howard Chu <howardchu95@...il.com>,
Weilin Wang <weilin.wang@...el.com>, Levi Yun <yeoreum.yun@....com>,
"Dr. David Alan Gilbert" <linux@...blig.org>, Zhongqiu Han <quic_zhonhan@...cinc.com>,
Blake Jones <blakejones@...gle.com>, Yicong Yang <yangyicong@...ilicon.com>,
Anubhav Shelat <ashelat@...hat.com>, Thomas Richter <tmricht@...ux.ibm.com>,
Jean-Philippe Romain <jean-philippe.romain@...s.st.com>, Song Liu <song@...nel.org>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 01/12] perf parse-events: Warn if a cpu term is unsupported
by a CPU
Factor requested CPU warning out of evlist and into evsel. At the end
of adding an event, perform the warning check. To avoid repeatedly
testing if the cpu_list is empty, add a local variable.
```
$ perf stat -e cpu_atom/cycles,cpu=1/ -a true
WARNING: A requested CPU in '1' is not supported by PMU 'cpu_atom' (CPUs 16-27) for event 'cpu_atom/cycles/'
Performance counter stats for 'system wide':
<not supported> cpu_atom/cycles/
0.000781511 seconds time elapsed
```
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/util/evlist.c | 15 +--------------
tools/perf/util/evsel.c | 24 ++++++++++++++++++++++++
tools/perf/util/evsel.h | 2 ++
tools/perf/util/parse-events.c | 12 ++++++++----
4 files changed, 35 insertions(+), 18 deletions(-)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 5664ebf6bbc6..a3c4d8558d29 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -2546,20 +2546,7 @@ void evlist__warn_user_requested_cpus(struct evlist *evlist, const char *cpu_lis
return;
evlist__for_each_entry(evlist, pos) {
- struct perf_cpu_map *intersect, *to_test, *online = cpu_map__online();
- const struct perf_pmu *pmu = evsel__find_pmu(pos);
-
- to_test = pmu && pmu->is_core ? pmu->cpus : online;
- intersect = perf_cpu_map__intersect(to_test, user_requested_cpus);
- if (!perf_cpu_map__equal(intersect, user_requested_cpus)) {
- char buf[128];
-
- cpu_map__snprint(to_test, buf, sizeof(buf));
- pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n",
- cpu_list, pmu ? pmu->name : "cpu", buf, evsel__name(pos));
- }
- perf_cpu_map__put(intersect);
- perf_cpu_map__put(online);
+ evsel__warn_user_requested_cpus(pos, user_requested_cpus);
}
perf_cpu_map__put(user_requested_cpus);
}
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index d55482f094bf..0208d999da24 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -4071,3 +4071,27 @@ void evsel__uniquify_counter(struct evsel *counter)
counter->uniquified_name = false;
}
}
+
+void evsel__warn_user_requested_cpus(struct evsel *evsel, struct perf_cpu_map *user_requested_cpus)
+{
+ struct perf_cpu_map *intersect, *online = NULL;
+ const struct perf_pmu *pmu = evsel__find_pmu(evsel);
+
+ if (pmu && pmu->is_core) {
+ intersect = perf_cpu_map__intersect(pmu->cpus, user_requested_cpus);
+ } else {
+ online = cpu_map__online();
+ intersect = perf_cpu_map__intersect(online, user_requested_cpus);
+ }
+ if (!perf_cpu_map__equal(intersect, user_requested_cpus)) {
+ char buf1[128];
+ char buf2[128];
+
+ cpu_map__snprint(user_requested_cpus, buf1, sizeof(buf1));
+ cpu_map__snprint(online ?: pmu->cpus, buf2, sizeof(buf2));
+ pr_warning("WARNING: A requested CPU in '%s' is not supported by PMU '%s' (CPUs %s) for event '%s'\n",
+ buf1, pmu ? pmu->name : "cpu", buf2, evsel__name(evsel));
+ }
+ perf_cpu_map__put(intersect);
+ perf_cpu_map__put(online);
+}
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 6dbc9690e0c9..8b5962a1e814 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -572,4 +572,6 @@ void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel,
bool evsel__is_offcpu_event(struct evsel *evsel);
+void evsel__warn_user_requested_cpus(struct evsel *evsel, struct perf_cpu_map *user_requested_cpus);
+
#endif /* __PERF_EVSEL_H */
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index d1965a7b97ed..7a32d5234a64 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -257,6 +257,7 @@ __add_event(struct list_head *list, int *idx,
struct evsel *evsel;
bool is_pmu_core;
struct perf_cpu_map *cpus;
+ bool has_cpu_list = !perf_cpu_map__is_empty(cpu_list);
/*
* Ensure the first_wildcard_match's PMU matches that of the new event
@@ -281,7 +282,7 @@ __add_event(struct list_head *list, int *idx,
if (pmu) {
is_pmu_core = pmu->is_core;
- cpus = perf_cpu_map__get(perf_cpu_map__is_empty(cpu_list) ? pmu->cpus : cpu_list);
+ cpus = perf_cpu_map__get(has_cpu_list ? cpu_list : pmu->cpus);
perf_pmu__warn_invalid_formats(pmu);
if (attr->type == PERF_TYPE_RAW || attr->type >= PERF_TYPE_MAX) {
perf_pmu__warn_invalid_config(pmu, attr->config, name,
@@ -296,10 +297,10 @@ __add_event(struct list_head *list, int *idx,
} else {
is_pmu_core = (attr->type == PERF_TYPE_HARDWARE ||
attr->type == PERF_TYPE_HW_CACHE);
- if (perf_cpu_map__is_empty(cpu_list))
- cpus = is_pmu_core ? perf_cpu_map__new_online_cpus() : NULL;
- else
+ if (has_cpu_list)
cpus = perf_cpu_map__get(cpu_list);
+ else
+ cpus = is_pmu_core ? cpu_map__online() : NULL;
}
if (init_attr)
event_attr_init(attr);
@@ -331,6 +332,9 @@ __add_event(struct list_head *list, int *idx,
if (list)
list_add_tail(&evsel->core.node, list);
+ if (has_cpu_list)
+ evsel__warn_user_requested_cpus(evsel, cpu_list);
+
return evsel;
}
--
2.50.0.727.gbf7dc18ff4-goog
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