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Date: Wed,  1 May 2024 21:01:06 -0700
Message-Id: <20240502040112.2111157-1-irogers@google.com>
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Subject: [PATCH v4 0/6] Assume sysfs event names are always the same case
From: Ian Rogers <irogers@google.com>
To: Kan Liang <kan.liang@linux.intel.com>, Thomas Richter <tmricht@linux.ibm.com>, 
	Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, 
	Arnaldo Carvalho de Melo <acme@kernel.org>, Namhyung Kim <namhyung@kernel.org>, 
	Mark Rutland <mark.rutland@arm.com>, 
	Alexander Shishkin <alexander.shishkin@linux.intel.com>, Jiri Olsa <jolsa@kernel.org>, 
	Bjorn Helgaas <bhelgaas@google.com>, Jonathan Corbet <corbet@lwn.net>, 
	Randy Dunlap <rdunlap@infradead.org>, Jing Zhang <renyu.zj@linux.alibaba.com>, 
	James Clark <james.clark@arm.com>, Ravi Bangoria <ravi.bangoria@amd.com>, 
	linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org
Cc: Ian Rogers <irogers@google.com>
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By assuming sysfs events are either upper or lower case, the case
insensitive event parsing can probe for the existence of files 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.

v3: incorporate feedback from Thomas Richter <tmricht@linux.ibm.com>
    that s390 event names are all upper case. Do a lower case probe
    then an upper case probe, make documentation and tests also agree.

v4: add checks to write (kernel test robot) and fix a typo.

Ian Rogers (6):
  perf test pmu-events: Make it clearer that pmu-events tests json
    events
  perf Document: Sysfs event names must be lower or upper 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 the same case
  perf pmu: Assume sysfs events are always the same case

 .../sysfs-bus-event_source-devices-events     |   6 +
 tools/perf/tests/pmu-events.c                 |   2 +-
 tools/perf/tests/pmu.c                        | 468 ++++++++++++------
 tools/perf/util/parse-events.c                |   2 +-
 tools/perf/util/parse-events.h                |   2 +-
 tools/perf/util/pmu.c                         | 111 +++--
 tools/perf/util/pmu.h                         |   4 +-
 tools/perf/util/pmus.c                        |  16 +-
 tools/perf/util/pmus.h                        |   2 +
 9 files changed, 416 insertions(+), 197 deletions(-)

-- 
2.45.0.rc0.197.gbae5840b3b-goog