[PATCH v2 0/6] Assume sysfs event names are always lowercase

Ian Rogers
2024-04-23T03:17:38Z

By assuming sysfs events are lower case, the case insensitive event
parsing can probe for the existence of a file rather then loading all
events in a directory. When the event is a json event like
inst_retired.any on Intel, this reduces the number of openat calls on
a Tigerlake laptop from 325 down to 255.

v1 sent as an RFC:
https://lore.kernel.org/lkml/20240413040812.4042051-1-irogers@google.com/

v2: addresses review feedback from Kan Liang, by updating
documentation and adding tests.

Ian Rogers (6):
perf test pmu-events: Make it clearer that pmu-events tests json
events
perf Document: Capture that sysfs event names must be lower case
perf test pmu: Refactor format test and exposed test APIs
perf test pmu: Add an eagerly loaded event test
perf test pmu: Test all sysfs PMU event names are lowercase
perf pmu: Assume sysfs events are always lowercase

.../sysfs-bus-event_source-devices-events | 6 +
tools/perf/tests/pmu-events.c | 2 +-
tools/perf/tests/pmu.c | 444 +++++++++++-------
tools/perf/util/parse-events.c | 2 +-
tools/perf/util/parse-events.h | 2 +-
tools/perf/util/pmu.c | 97 ++--
tools/perf/util/pmu.h | 4 +-
tools/perf/util/pmus.c | 16 +-
tools/perf/util/pmus.h | 2 +
9 files changed, 377 insertions(+), 198 deletions(-)

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2.44.0.769.g3c40516874-goog