linux-kernel - [PATCH 01/20] perf tools: Save evsel->pmu in parse

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Date:   Mon, 17 Oct 2022 19:02:08 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>, Andi Kleen <ak@...ux.intel.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        James Clark <james.clark@....com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>
Subject: [PATCH 01/20] perf tools: Save evsel->pmu in parse_events()

Now evsel has a pmu pointer, let's save the info and use it like in
evsel__find_pmu().  The missing feature check needs to be changed as
the pmu pointer can be set from the beginning.

Acked-by: Ian Rogers <irogers@...gle.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/evsel.c        | 20 ++++++++++----------
 tools/perf/util/parse-events.c |  1 +
 tools/perf/util/pmu.c          |  4 ++++
 3 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 76605fde3507..b7140beca970 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -467,6 +467,7 @@ struct evsel *evsel__clone(struct evsel *orig)
 	evsel->collect_stat = orig->collect_stat;
 	evsel->weak_group = orig->weak_group;
 	evsel->use_config_name = orig->use_config_name;
+	evsel->pmu = orig->pmu;
 
 	if (evsel__copy_config_terms(evsel, orig) < 0)
 		goto out_err;
@@ -1966,17 +1967,16 @@ bool evsel__detect_missing_features(struct evsel *evsel)
 		perf_missing_features.mmap2 = true;
 		pr_debug2_peo("switching off mmap2\n");
 		return true;
-	} else if ((evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) &&
-		   (evsel->pmu == NULL || evsel->pmu->missing_features.exclude_guest)) {
-		if (evsel->pmu == NULL) {
+	} else if (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) {
+		if (evsel->pmu == NULL)
 			evsel->pmu = evsel__find_pmu(evsel);
-			if (evsel->pmu)
-				evsel->pmu->missing_features.exclude_guest = true;
-			else {
-				/* we cannot find PMU, disable attrs now */
-				evsel->core.attr.exclude_host = false;
-				evsel->core.attr.exclude_guest = false;
-			}
+
+		if (evsel->pmu)
+			evsel->pmu->missing_features.exclude_guest = true;
+		else {
+			/* we cannot find PMU, disable attrs now */
+			evsel->core.attr.exclude_host = false;
+			evsel->core.attr.exclude_guest = false;
 		}
 
 		if (evsel->exclude_GH) {
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 5973f46c2375..6502cd679f57 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -266,6 +266,7 @@ __add_event(struct list_head *list, int *idx,
 	evsel->core.own_cpus = perf_cpu_map__get(cpus);
 	evsel->core.requires_cpu = pmu ? pmu->is_uncore : false;
 	evsel->auto_merge_stats = auto_merge_stats;
+	evsel->pmu = pmu;
 
 	if (name)
 		evsel->name = strdup(name);
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 03284059175f..6a86e6af0903 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1065,11 +1065,15 @@ struct perf_pmu *evsel__find_pmu(struct evsel *evsel)
 {
 	struct perf_pmu *pmu = NULL;
 
+	if (evsel->pmu)
+		return evsel->pmu;
+
 	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
 		if (pmu->type == evsel->core.attr.type)
 			break;
 	}
 
+	evsel->pmu = pmu;
 	return pmu;
 }
 
-- 
2.38.0.413.g74048e4d9e-goog