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Message-Id: <20240626145448.896746-2-james.clark@arm.com>
Date: Wed, 26 Jun 2024 15:54:45 +0100
From: James Clark <james.clark@....com>
To: linux-perf-users@...r.kernel.org,
irogers@...gle.com,
namhyung@...nel.org
Cc: robin.murphy@....com,
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>,
Adrian Hunter <adrian.hunter@...el.com>,
"Liang, Kan" <kan.liang@...ux.intel.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] perf pmu: Restore full PMU name wildcard support
Commit b2b9d3a3f021 ("perf pmu: Support wildcards on pmu name in dynamic
pmu events") gives the following example for wildcarding a subset of
PMUs:
E.g., in a system with the following dynamic pmus:
mypmu_0
mypmu_1
mypmu_2
mypmu_4
perf stat -e mypmu_[01]/<config>/
Since commit f91fa2ae6360 ("perf pmu: Refactor perf_pmu__match()"), only
"*" has been supported, removing the ability to subset PMUs, even though
parse-events.l still supports ? and [] characters.
Fix it by using fnmatch() when any glob character is detected and add a
test which covers that and other scenarios of
perf_pmu__match_ignoring_suffix().
Fixes: f91fa2ae6360 ("perf pmu: Refactor perf_pmu__match()")
Signed-off-by: James Clark <james.clark@....com>
---
tools/perf/tests/pmu.c | 78 ++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/pmu.c | 2 +-
2 files changed, 79 insertions(+), 1 deletion(-)
diff --git a/tools/perf/tests/pmu.c b/tools/perf/tests/pmu.c
index 201df4446f7c..40132655ccd1 100644
--- a/tools/perf/tests/pmu.c
+++ b/tools/perf/tests/pmu.c
@@ -453,12 +453,90 @@ static int test__name_cmp(struct test_suite *test __maybe_unused, int subtest __
return TEST_OK;
}
+/**
+ * Test perf_pmu__match() that's used to search for a PMU given a name passed
+ * on the command line. The name that's passed may also be a filename type glob
+ * match.
+ */
+static int test__pmu_match(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
+{
+ struct perf_pmu test_pmu;
+
+ test_pmu.name = "pmuname";
+ TEST_ASSERT_EQUAL("Exact match", perf_pmu__match(&test_pmu, "pmuname"), true);
+ TEST_ASSERT_EQUAL("Longer token", perf_pmu__match(&test_pmu, "longertoken"), false);
+ TEST_ASSERT_EQUAL("Shorter token", perf_pmu__match(&test_pmu, "pmu"), false);
+
+ test_pmu.name = "pmuname_10";
+ TEST_ASSERT_EQUAL("Diff suffix_", perf_pmu__match(&test_pmu, "pmuname_2"), false);
+ TEST_ASSERT_EQUAL("Sub suffix_", perf_pmu__match(&test_pmu, "pmuname_1"), true);
+ TEST_ASSERT_EQUAL("Same suffix_", perf_pmu__match(&test_pmu, "pmuname_10"), true);
+ TEST_ASSERT_EQUAL("No suffix_", perf_pmu__match(&test_pmu, "pmuname"), true);
+ TEST_ASSERT_EQUAL("Underscore_", perf_pmu__match(&test_pmu, "pmuname_"), true);
+ TEST_ASSERT_EQUAL("Substring_", perf_pmu__match(&test_pmu, "pmuna"), false);
+
+ test_pmu.name = "pmuname_ab23";
+ TEST_ASSERT_EQUAL("Diff suffix hex_", perf_pmu__match(&test_pmu, "pmuname_2"), false);
+ TEST_ASSERT_EQUAL("Sub suffix hex_", perf_pmu__match(&test_pmu, "pmuname_ab"), true);
+ TEST_ASSERT_EQUAL("Same suffix hex_", perf_pmu__match(&test_pmu, "pmuname_ab23"), true);
+ TEST_ASSERT_EQUAL("No suffix hex_", perf_pmu__match(&test_pmu, "pmuname"), true);
+ TEST_ASSERT_EQUAL("Underscore hex_", perf_pmu__match(&test_pmu, "pmuname_"), true);
+ TEST_ASSERT_EQUAL("Substring hex_", perf_pmu__match(&test_pmu, "pmuna"), false);
+
+ test_pmu.name = "pmuname10";
+ TEST_ASSERT_EQUAL("Diff suffix", perf_pmu__match(&test_pmu, "pmuname2"), false);
+ TEST_ASSERT_EQUAL("Sub suffix", perf_pmu__match(&test_pmu, "pmuname1"), true);
+ TEST_ASSERT_EQUAL("Same suffix", perf_pmu__match(&test_pmu, "pmuname10"), true);
+ TEST_ASSERT_EQUAL("No suffix", perf_pmu__match(&test_pmu, "pmuname"), true);
+ TEST_ASSERT_EQUAL("Underscore", perf_pmu__match(&test_pmu, "pmuname_"), false);
+ TEST_ASSERT_EQUAL("Substring", perf_pmu__match(&test_pmu, "pmuna"), false);
+
+ test_pmu.name = "pmunameab23";
+ TEST_ASSERT_EQUAL("Diff suffix hex", perf_pmu__match(&test_pmu, "pmuname2"), false);
+ TEST_ASSERT_EQUAL("Sub suffix hex", perf_pmu__match(&test_pmu, "pmunameab"), true);
+ TEST_ASSERT_EQUAL("Same suffix hex", perf_pmu__match(&test_pmu, "pmunameab23"), true);
+ TEST_ASSERT_EQUAL("No suffix hex", perf_pmu__match(&test_pmu, "pmuname"), true);
+ TEST_ASSERT_EQUAL("Underscore hex", perf_pmu__match(&test_pmu, "pmuname_"), false);
+ TEST_ASSERT_EQUAL("Substring hex", perf_pmu__match(&test_pmu, "pmuna"), false);
+
+ /*
+ * 2 hex chars or less are not considered suffixes so it shouldn't be
+ * possible to wildcard by skipping the suffix. Therefore there are more
+ * false results here than above.
+ */
+ test_pmu.name = "pmuname_a3";
+ TEST_ASSERT_EQUAL("Diff suffix 2 hex_", perf_pmu__match(&test_pmu, "pmuname_2"), false);
+ /*
+ * This one should be false, but because pmuname_a3 ends in 3 which is
+ * decimal, it's not possible to determine if it's a short hex suffix or
+ * a normal decimal suffix following text. And we want to match on any
+ * length of decimal suffix. Run the test anyway and expect the wrong
+ * result. And slightly fuzzy matching shouldn't do too much harm.
+ */
+ TEST_ASSERT_EQUAL("Sub suffix 2 hex_", perf_pmu__match(&test_pmu, "pmuname_a"), true);
+ TEST_ASSERT_EQUAL("Same suffix 2 hex_", perf_pmu__match(&test_pmu, "pmuname_a3"), true);
+ TEST_ASSERT_EQUAL("No suffix 2 hex_", perf_pmu__match(&test_pmu, "pmuname"), false);
+ TEST_ASSERT_EQUAL("Underscore 2 hex_", perf_pmu__match(&test_pmu, "pmuname_"), false);
+ TEST_ASSERT_EQUAL("Substring 2 hex_", perf_pmu__match(&test_pmu, "pmuna"), false);
+
+ test_pmu.name = "pmuname_5";
+ TEST_ASSERT_EQUAL("Glob 1", perf_pmu__match(&test_pmu, "pmu*"), true);
+ TEST_ASSERT_EQUAL("Glob 2", perf_pmu__match(&test_pmu, "nomatch*"), false);
+ TEST_ASSERT_EQUAL("Seq 1", perf_pmu__match(&test_pmu, "pmuname_[12345]"), true);
+ TEST_ASSERT_EQUAL("Seq 2", perf_pmu__match(&test_pmu, "pmuname_[67890]"), false);
+ TEST_ASSERT_EQUAL("? 1", perf_pmu__match(&test_pmu, "pmuname_?"), true);
+ TEST_ASSERT_EQUAL("? 2", perf_pmu__match(&test_pmu, "pmuname_1?"), false);
+
+ return TEST_OK;
+}
+
static struct test_case tests__pmu[] = {
TEST_CASE("Parsing with PMU format directory", pmu_format),
TEST_CASE("Parsing with PMU event", pmu_events),
TEST_CASE("PMU event names", pmu_event_names),
TEST_CASE("PMU name combining", name_len),
TEST_CASE("PMU name comparison", name_cmp),
+ TEST_CASE("PMU cmdline match", pmu_match),
{ .name = NULL, }
};
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index c94a91645b21..97d74fe6d816 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -2150,7 +2150,7 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
bool perf_pmu__match(const struct perf_pmu *pmu, const char *tok)
{
const char *name = pmu->name;
- bool need_fnmatch = strchr(tok, '*') != NULL;
+ bool need_fnmatch = strisglob(tok);
if (!strncmp(tok, "uncore_", 7))
tok += 7;
--
2.34.1
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