[v3,00/13] Tool and hwmon PMUs

Message

Ian Rogers Oct. 2, 2024, 3:20 a.m. UTC

Rather than have fake and tool PMUs being special flags in an evsel,
create special PMUs. This allows, for example, duration_time to also
be tool/duration_time/. Once adding events to the tools PMU is just
adding to an array, add events for nearly all the expr literals like
num_cpus_online. Rather than create custom logic for finding and
describing the tool events use json and add a notion of common json
for the tool events.

Following the convention of the tool PMU, create a hwmon PMU that
exposes hwmon data for reading. For example, the following shows
reading the CPU temperature and 2 fan speeds alongside the uncore
frequency:
```
$ perf stat -e temp_cpu,fan1,hwmon_thinkpad/fan2/,tool/num_cpus_online/ -M UNCORE_FREQ -I 1000
     1.001153138              52.00 'C   temp_cpu
     1.001153138              2,588 rpm  fan1
     1.001153138              2,482 rpm  hwmon_thinkpad/fan2/
     1.001153138                  8      tool/num_cpus_online/
     1.001153138      1,077,101,397      UNC_CLOCK.SOCKET                 #     1.08 UNCORE_FREQ
     1.001153138      1,012,773,595      duration_time
...
```

Additional data on the hwmon events is in perf list:
```
$ perf list
...
hwmon:
...
  temp_core_0 OR temp2
       [Temperature in unit coretemp named Core 0. crit=100'C,max=100'C crit_alarm=0'C. Unit:
        hwmon_coretemp]
...
```

v3: Rebase, add Namhyung's acked-by to patches 1 to 10.
v2: Address Namhyung's review feedback. Rebase dropping 4 patches
    applied by Arnaldo, fix build breakage reported by Arnaldo.

Ian Rogers (13):
  perf pmu: Simplify an asprintf error message
  perf pmu: Allow hardcoded terms to be applied to attributes
  perf parse-events: Expose/rename config_term_name
  perf tool_pmu: Factor tool events into their own PMU
  perf tool_pmu: Rename enum perf_tool_event to tool_pmu_event
  perf tool_pmu: Rename perf_tool_event__* to tool_pmu__*
  perf tool_pmu: Move expr literals to tool_pmu
  perf jevents: Add tool event json under a common architecture
  perf tool_pmu: Switch to standard pmu functions and json descriptions
  perf tests: Add tool PMU test
  perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs
  perf test: Add hwmon "PMU" test
  perf docs: Document tool and hwmon events

 tools/perf/Documentation/perf-list.txt        |  15 +
 tools/perf/arch/arm64/util/pmu.c              |   5 +-
 tools/perf/arch/x86/util/intel-pt.c           |   3 +-
 tools/perf/arch/x86/util/tsc.c                |  18 +-
 tools/perf/builtin-list.c                     |  13 +-
 tools/perf/builtin-stat.c                     |   7 +-
 .../pmu-events/arch/common/common/tool.json   |  74 ++
 tools/perf/pmu-events/empty-pmu-events.c      | 208 +++--
 tools/perf/pmu-events/jevents.py              |  16 +-
 tools/perf/tests/Build                        |   2 +
 tools/perf/tests/builtin-test.c               |   2 +
 tools/perf/tests/hwmon_pmu.c                  | 243 ++++++
 tools/perf/tests/pmu.c                        |   3 +-
 tools/perf/tests/tests.h                      |   2 +
 tools/perf/tests/tool_pmu.c                   | 111 +++
 tools/perf/util/Build                         |   2 +
 tools/perf/util/evsel.c                       | 287 +-----
 tools/perf/util/evsel.h                       |  28 +-
 tools/perf/util/expr.c                        |  93 +-
 tools/perf/util/hwmon_pmu.c                   | 818 ++++++++++++++++++
 tools/perf/util/hwmon_pmu.h                   | 154 ++++
 tools/perf/util/metricgroup.c                 |  35 +-
 tools/perf/util/parse-events.c                |  63 +-
 tools/perf/util/parse-events.h                |   5 +-
 tools/perf/util/parse-events.l                |  11 -
 tools/perf/util/parse-events.y                |  16 -
 tools/perf/util/pmu.c                         | 104 ++-
 tools/perf/util/pmu.h                         |   9 +-
 tools/perf/util/pmus.c                        |  16 +
 tools/perf/util/pmus.h                        |   3 +
 tools/perf/util/print-events.c                |  36 +-
 tools/perf/util/print-events.h                |   1 -
 tools/perf/util/stat-display.c                |  14 +-
 tools/perf/util/stat-shadow.c                 |  22 +-
 tools/perf/util/tool_pmu.c                    | 506 +++++++++++
 tools/perf/util/tool_pmu.h                    |  56 ++
 tools/perf/util/tsc.h                         |   2 +-
 37 files changed, 2374 insertions(+), 629 deletions(-)
 create mode 100644 tools/perf/pmu-events/arch/common/common/tool.json
 create mode 100644 tools/perf/tests/hwmon_pmu.c
 create mode 100644 tools/perf/tests/tool_pmu.c
 create mode 100644 tools/perf/util/hwmon_pmu.c
 create mode 100644 tools/perf/util/hwmon_pmu.h
 create mode 100644 tools/perf/util/tool_pmu.c
 create mode 100644 tools/perf/util/tool_pmu.h