[PATCH v2 00/16] Intel TPEBS min/max/mean/last support

Ian Rogers
2025-04-07T05:01:09Z

The patches add support to computing the min, max, mean or last
retirement latency and then using that value as the basis for metrics.
When values aren't available, support is added to use the retirement
latency as recorded for an event in the perf json.

Support is added for reading the retirement latency from the forked
perf command more than once. To avoid killing the process commands are
sent through the control fd. Some name handling is changed to make it
more robust.

Rather than retirement latency events having issues with perf record,
make it so that the retirement latency modifier enables sample
weights.

v2: Addition of header cleanup patch originally posted:
https://lore.kernel.org/lkml/20241210191823.612631-1-irogers@google.com/
as there are no arch specific reasons not to build this code.
Fix bug in "perf pmu-events: Add retirement latency to JSON events
inside of perf" where "t->stats.n != 0" should have been
"t->stats.n == 0".
Add patch so that perf record of a retirement latency event
doesn't crash but instead enables sample weights for the event.

Ian Rogers (16):
perf intel-tpebs: Cleanup header
perf intel-tpebs: Simplify tpebs_cmd
perf intel-tpebs: Rename tpebs_start to evsel__tpebs_open
perf intel-tpebs: Separate evsel__tpebs_prepare out of
evsel__tpebs_open
perf intel-tpebs: Move cpumap_buf out of evsel__tpebs_open
perf intel-tpebs: Reduce scope of tpebs_events_size
perf intel-tpebs: Inline get_perf_record_args
perf intel-tpebs: Ensure events are opened, factor out finding
perf intel-tpebs: Refactor tpebs_results list
perf intel-tpebs: Add support for updating counts in evsel__tpebs_read
perf intel-tpebs: Add mutex for tpebs_results
perf intel-tpebs: Don't close record on read
perf intel-tpebs: Use stats for retirement latency statistics
perf stat: Add mean, min, max and last --tpebs-mode options
perf pmu-events: Add retirement latency to JSON events inside of perf
perf record: Retirement latency cleanup in evsel__config

tools/perf/Documentation/perf-stat.txt | 7 +
tools/perf/builtin-stat.c | 29 +-
tools/perf/pmu-events/empty-pmu-events.c | 216 ++++----
tools/perf/pmu-events/jevents.py | 6 +
tools/perf/pmu-events/pmu-events.h | 3 +
tools/perf/util/Build | 2 +-
tools/perf/util/evlist.c | 1 -
tools/perf/util/evsel.c | 22 +-
tools/perf/util/evsel.h | 6 +
tools/perf/util/intel-tpebs.c | 677 ++++++++++++++---------
tools/perf/util/intel-tpebs.h | 40 +-
tools/perf/util/parse-events.c | 4 +
tools/perf/util/pmu.c | 52 +-
tools/perf/util/pmu.h | 3 +
14 files changed, 662 insertions(+), 406 deletions(-)

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2.49.0.504.g3bcea36a83-goog