lwn.git/tools/perf/tests/parse-events.c, branch docs-fixes

perf test: Fix ratio_to_prev event parsing test

2026-04-02T19:51:10+00:00

test__ratio_to_prev() assumed the first event in a group is the leader, which is not the case when the event is expanded into two event groups on hybrid PMU's with auto counter reload support. Instead, iterate over the event group generated for each core PMU. Also update "wrong leader" test to check that the subordinate event has the correct leader instead of checking that it is not the group leader. Finally, do not exit immediately if a PMU without auto counter reload support is found. Signed-off-by: Thomas Falcon Reviewed-by: Dapeng Mi Reviewed-by: Ian Rogers Fixes: 56be0fe5f62c ("perf record: Add auto counter reload parse and regression tests") Signed-off-by: Namhyung Kim

perf test: Add missing newlines in debug messages

2026-01-20T20:34:51+00:00

These debug messages bleed into the next log line. Fix it by adding the missing newlines. Reviewed-by: Ian Rogers Signed-off-by: James Clark Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: Leo Yan Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Use const for variables receiving str{str,r?chr}() returns

2025-12-17T12:30:37+00:00

Newer glibc versions return const char for str{str,chr}() where the haystack/s is const so to avoid warnings like these on fedora 44 change some variables to const: 36 8.17 fedora:44 : FAIL gcc version 15.2.1 20251111 (Red Hat 15.2.1-4) (GCC) libbpf.c: In function 'kallsyms_cb': libbpf.c:8489:13: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers] 8489 | res = strstr(sym_name, ".llvm."); Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20251211221756.96294-4-acme@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Add support for perf_event_attr::config4

2025-11-24T20:20:06+00:00

perf_event_attr has gained a new field, config4, so add support for it extending the existing configN support. Reviewed-by: Leo Yan Reviewed-by: Ian Rogers Tested-by: Leo Yan Signed-off-by: James Clark Acked-by: Peter Zijlstra (Intel) Signed-off-by: Namhyung Kim

perf test parse-events: Add evsel test helper

2025-10-15T14:59:12+00:00

Add TEST_ASSERT_EVSEL to dump the failing evsel in the event of a failure. Signed-off-by: Ian Rogers Tested-by: James Clark Signed-off-by: Namhyung Kim

perf test parse-events: Add evlist test helper

2025-10-15T14:59:12+00:00

Add TEST_ASSERT_EVLIST to dump the failing evlist in the event of a failure. Add the macro to a number of tests not currently checking the evlist length. Signed-off-by: Ian Rogers Tested-by: James Clark Signed-off-by: Namhyung Kim

perf test: Clean up test_..config helpers

2025-10-15T14:59:12+00:00

Just have a single test_hw_config helper that strips extended type information in the case of hardware and hardware cache events. Signed-off-by: Ian Rogers Tested-by: James Clark Signed-off-by: Namhyung Kim

perf test parse-events: Remove cpu PMU requirement

2025-10-15T14:59:11+00:00

In the event parse string, switch "cpu" to "default_core" and then rewrite this to the first core PMU name prior to parsing. This enables testing with a PMU on hybrid x86 and other systems that don't use "cpu" for the core PMU name. The name "default_core" is already used by jevents. Update test expectations to match. Signed-off-by: Ian Rogers Tested-by: James Clark Signed-off-by: Namhyung Kim

perf test parse-events: Without a PMU use cpu-cycles rather than cycles

2025-10-15T14:59:11+00:00

Without a PMU perf matches an event against any PMU with the event. Unfortunately some PMU drivers advertise a "cycles" event which is typically just a core event. Switch to using "cpu-cycles" which is an indentical legacy event but avoids the multiple PMU confusion introduced by the PMU drivers. Note, on x86 cpu-cycles is also a sysfs event but cycles isn't. Signed-off-by: Ian Rogers Tested-by: James Clark Signed-off-by: Namhyung Kim

perf test parse-events: Use evsel__match for legacy events

2025-10-15T14:59:11+00:00

Switch from the test's assert_hw/test_config to the common evsel__match code that appropriately handles events with both legacy and sysfs/json encoding. For tests asserting that a config value matches that placed in the perf_event_attr just directly compare the config values. Signed-off-by: Ian Rogers Tested-by: James Clark Signed-off-by: Namhyung Kim