linux-kernel - [PATCH v5 0/6] Assume sysfs event names are always the same case

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Message-Id: <20240502213507.2339733-1-irogers@google.com>
Date: Thu,  2 May 2024 14:35:01 -0700
From: Ian Rogers <irogers@...gle.com>
To: Kan Liang <kan.liang@...ux.intel.com>, Thomas Richter <tmricht@...ux.ibm.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>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Jonathan Corbet <corbet@....net>, 
	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
Cc: Ian Rogers <irogers@...gle.com>
Subject: [PATCH v5 0/6] Assume sysfs event names are always the same case

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@...ux.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.

v5: Add reviewed-by: Kan Liang and fix potential uninitialized use.

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                        | 467 ++++++++++++------
 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, 415 insertions(+), 197 deletions(-)

-- 
2.45.0.rc1.225.g2a3ae87e7f-goog