linux-kernel - [PATCH v1 07/10] perf evsel: Add function to compute pmu

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Date:   Wed,  1 Mar 2023 20:12:08 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "Steinar H. Gunderson" <sesse@...gle.com>,
        Qi Liu <liuqi115@...wei.com>,
        Kim Phillips <kim.phillips@....com>,
        Florian Fischer <florian.fischer@...q.space>,
        James Clark <james.clark@....com>,
        Suzuki Poulouse <suzuki.poulose@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Leo Yan <leo.yan@...aro.org>,
        John Garry <john.g.garry@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v1 07/10] perf evsel: Add function to compute pmu_name

The computed pmu_name respects software events and aux event groups,
such that the pmu_name is changed to be that of the aux event leader
or group leader for software events. This is done as a later change
will split events that are in different PMUs into different groups.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/evsel.c | 24 ++++++++++++++++++++++++
 tools/perf/util/evsel.h |  1 +
 2 files changed, 25 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 2dc2c24252bb..9c6b486f8bd4 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -821,6 +821,30 @@ const char *evsel__name(struct evsel *evsel)
 	return "unknown";
 }
 
+const char *evsel__pmu_name(const struct evsel *evsel)
+{
+	const struct evsel *leader;
+
+	/* If the pmu_name is set use it. pmu_name isn't set for CPU and software events. */
+	if (evsel->pmu_name)
+		return evsel->pmu_name;
+	/*
+	 * Software events may be in a group with other uncore PMU events. Use
+	 * the pmu_name of the group leader to avoid breaking the software event
+	 * out of the group.
+	 *
+	 * Aux event leaders, like intel_pt, expect a group with events from
+	 * other PMUs, so substitute the AUX event's PMU in this case.
+	 */
+	leader  = evsel__leader(evsel);
+	if ((evsel->core.attr.type == PERF_TYPE_SOFTWARE || evsel__is_aux_event(leader)) &&
+	    leader->pmu_name) {
+		return leader->pmu_name;
+	}
+
+	return "cpu";
+}
+
 const char *evsel__metric_id(const struct evsel *evsel)
 {
 	if (evsel->metric_id)
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 676c499323e9..72121194d3b1 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -280,6 +280,7 @@ int arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size);
 
 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size);
 const char *evsel__name(struct evsel *evsel);
+const char *evsel__pmu_name(const struct evsel *evsel);
 const char *evsel__metric_id(const struct evsel *evsel);
 
 static inline bool evsel__is_tool(const struct evsel *evsel)
-- 
2.39.2.722.g9855ee24e9-goog