linux-kernel - [PATCH v2 07/23] perf pmu: Add is

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Date:   Sun, 21 May 2023 23:43:14 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        John Garry <john.g.garry@...cle.com>,
        Will Deacon <will@...nel.org>,
        James Clark <james.clark@....com>,
        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>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Jing Zhang <renyu.zj@...ux.alibaba.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Ming Wang <wangming01@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>,
        Sandipan Das <sandipan.das@....com>,
        Dmitrii Dolgov <9erthalion6@...il.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Ali Saidi <alisaidi@...zon.com>, Rob Herring <robh@...nel.org>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Kang Minchul <tegongkang@...il.com>,
        linux-kernel@...r.kernel.org, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org
Subject: [PATCH v2 07/23] perf pmu: Add is_core to pmu

Cache is_pmu_core in the pmu to avoid recomputation.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/pmu.c | 7 ++++---
 tools/perf/util/pmu.h | 7 +++++++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 0fa451c60c77..930ec3786964 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -954,6 +954,7 @@ static struct perf_pmu *pmu_lookup(int dirfd, const char *lookup_name)
 	}
 
 	pmu->type = type;
+	pmu->is_core = is_pmu_core(name);
 	pmu->is_uncore = pmu_is_uncore(dirfd, name);
 	if (pmu->is_uncore)
 		pmu->id = pmu_id(name);
@@ -1661,12 +1662,12 @@ bool is_pmu_hybrid(const char *name)
 
 bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu)
 {
-	return is_pmu_core(pmu->name);
+	return pmu->is_core;
 }
 
 bool perf_pmu__supports_wildcard_numeric(const struct perf_pmu *pmu)
 {
-	return is_pmu_core(pmu->name);
+	return pmu->is_core;
 }
 
 bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu)
@@ -1725,7 +1726,7 @@ void print_pmu_events(const struct print_callbacks *print_cb, void *print_state)
 	pmu = NULL;
 	j = 0;
 	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
-		bool is_cpu = is_pmu_core(pmu->name);
+		bool is_cpu = pmu->is_core;
 
 		list_for_each_entry(event, &pmu->aliases, list) {
 			aliases[j].event = event;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 99e0273027bf..af10d137e2b5 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -59,6 +59,13 @@ struct perf_pmu {
 	 * @selectable: Can the PMU name be selected as if it were an event?
 	 */
 	bool selectable;
+	/**
+	 * @is_core: Is the PMU the core CPU PMU? Determined by the name being
+	 * "cpu" or by the presence of
+	 * <sysfs>/bus/event_source/devices/<name>/cpus. There may be >1 core
+	 * PMU on systems like Intel hybrid.
+	 */
+	bool is_core;
 	/**
 	 * @is_uncore: Is the PMU not within the CPU core? Determined by the
 	 * presence of <sysfs>/bus/event_source/devices/<name>/cpumask.
-- 
2.40.1.698.g37aff9b760-goog