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

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Date: Mon, 22 Apr 2024 20:17:13 -0700
From: Ian Rogers <irogers@...gle.com>
To: Kan Liang <kan.liang@...ux.intel.com>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Jonathan Corbet <corbet@....net>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Randy Dunlap <rdunlap@...radead.org>, Jing Zhang <renyu.zj@...ux.alibaba.com>, 
	James Clark <james.clark@....com>, Ravi Bangoria <ravi.bangoria@....com>, 
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH v2 0/6] Assume sysfs event names are always lowercase

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(-)

-- 
2.44.0.769.g3c40516874-goog