linux-kernel - [PATCH v1 01/31] perf test: Avoid sysfs state affecting fake events

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Message-Id: <20220722223240.1618013-2-irogers@google.com>
Date:   Fri, 22 Jul 2022 15:32:10 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     perry.taylor@...el.com, caleb.biggers@...el.com,
        kshipra.bopardikar@...el.com,
        Kan Liang <kan.liang@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.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@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Andi Kleen <ak@...ux.intel.com>,
        James Clark <james.clark@....com>,
        John Garry <john.garry@...wei.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Sedat Dilek <sedat.dilek@...il.com>
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v1 01/31] perf test: Avoid sysfs state affecting fake events

Icelake has a slots event, on my Skylakex I have CPU events in sysfs
of topdown-slots-issued and topdown-total-slots. Legacy event parsing
would try to use '-' to separate parts of an event and so
perf_pmu__parse_init sets 'slots' to be a PMU_EVENT_SYMBOL_SUFFIX2. As
such parsing the slots event for a fake PMU fails as a
PMU_EVENT_SYMBOL_SUFFIX2 isn't made into the PE_PMU_EVENT_FAKE token.
Resolve this issue by test initializing the PMU parsing state before
every parse. This must be done every parse as the state is removes after
each parse_events.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/tests/pmu-events.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c
index 478b33825790..263cbb67c861 100644
--- a/tools/perf/tests/pmu-events.c
+++ b/tools/perf/tests/pmu-events.c
@@ -812,6 +812,15 @@ static int check_parse_id(const char *id, struct parse_events_error *error,
 	for (cur = strchr(dup, '@') ; cur; cur = strchr(++cur, '@'))
 		*cur = '/';
 
+	if (fake_pmu) {
+		/*
+		 * Every call to __parse_events will try to initialize the PMU
+		 * state from sysfs and then clean it up at the end. Reset the
+		 * PMU events to the test state so that we don't pick up
+		 * erroneous prefixes and suffixes.
+		 */
+		perf_pmu__test_parse_init();
+	}
 	ret = __parse_events(evlist, dup, error, fake_pmu);
 	free(dup);
 
-- 
2.37.1.359.gd136c6c3e2-goog