linux-kernel - [PATCH v1 1/2] perf pmu: Only warn about unsupported configs once

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Date:   Wed, 31 May 2023 19:36:43 -0700
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>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Rob Herring <robh@...nel.org>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        James Clark <james.clark@....com>,
        Suzuki Poulouse <suzuki.poulose@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/2] perf pmu: Only warn about unsupported configs once

Avoid scanning format list for each event parsed.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/pmu.c | 5 +++++
 tools/perf/util/pmu.h | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 0520aa9fe991..204ce3f02e63 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -934,6 +934,11 @@ void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu)
 {
 	struct perf_pmu_format *format;
 
+	if (pmu->formats_checked)
+		return;
+
+	pmu->formats_checked = true;
+
 	/* fake pmu doesn't have format list */
 	if (pmu == &perf_pmu__fake)
 		return;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 287f593b15c7..7a1535dc1f12 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -76,6 +76,11 @@ struct perf_pmu {
 	 * specific code.
 	 */
 	bool auxtrace;
+	/**
+	 * @formats_checked: Only check PMU's formats are valid for
+	 * perf_event_attr once.
+	 */
+	bool formats_checked;
 	/**
 	 * @max_precise: Number of levels of :ppp precision supported by the
 	 * PMU, read from
-- 
2.41.0.rc0.172.g3f132b7071-goog