Commit 6f87719b authored Jan 14, 2026 by James Clark Committed by Arnaldo Carvalho de Melo Jan 14, 2026

perf parse-events: Always track user config changes



Requiring the 'pmu->perf_event_attr_init_default' callback to be set to
track user changes is a bit of a trap to fall in. It's hard to see that
this is required when depending on the user change tracking.

It's possible to want all 0 defaults so not set it, but at the same time
still do some programmatic setting of configs with
evsel__set_config_if_unset(). Also if a PMU reverts to 0 defaults and
deletes its existing callback, it will silently break existing uses of
evsel__set_config_if_unset().

One way to fix this would be to assert in evsel__set_config_if_unset()
if the changes weren't tracked, but that would be a possibly untested
runtime failure. Instead, always track it as it's harmless and
simplifies testing too.

Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 34b4cfbe

tools/perf/util/parse-events.c

+2 −6

Original line number	Diff line number	Diff line
		@@ -1528,12 +1528,8 @@ static int parse_events_add_pmu(struct parse_events_state *parse_state,
		return -ENOMEM;
		}

		/*
		* When using default config, record which bits of attr->config were
		* changed by the user.
		*/
		if (pmu->perf_event_attr_init_default &&
		get_config_chgs(pmu, &parsed_terms, &config_terms)) {
		/* Record which bits of attr->config were changed by the user. */
		if (get_config_chgs(pmu, &parsed_terms, &config_terms)) {
		parse_events_terms__exit(&parsed_terms);
		return -ENOMEM;
		}