[PATCH v5 0/2] perf list: Remove duplicate PMUs

[Ian Rogers]

When there are multiple PMUs, differing by ordered suffixes, by
default only display one. This avoids repeated listing of events, in
particular when there are 10s of uncore PMUs. If "-v" is passed to
"perf list" then still list all PMUs.

Listing fewer PMU/event combinations helps speed the all PMU event
tests.

Before:
```
$ perf list
...
  uncore_imc_free_running_0/data_read/               [Kernel PMU event]
  uncore_imc_free_running_0/data_total/              [Kernel PMU event]
  uncore_imc_free_running_0/data_write/              [Kernel PMU event]
  uncore_imc_free_running_1/data_read/               [Kernel PMU event]
  uncore_imc_free_running_1/data_total/              [Kernel PMU event]
  uncore_imc_free_running_1/data_write/              [Kernel PMU event]
```

After:
```
$ perf list
...
  uncore_imc_free_running/data_read/                 [Kernel PMU event]
  uncore_imc_free_running/data_total/                [Kernel PMU event]
  uncore_imc_free_running/data_write/                [Kernel PMU event]
...
$ perf list -v
...
  uncore_imc_free_running_0/data_read/               [Kernel PMU event]
  uncore_imc_free_running_0/data_total/              [Kernel PMU event]
  uncore_imc_free_running_0/data_write/              [Kernel PMU event]
  uncore_imc_free_running_1/data_read/               [Kernel PMU event]
  uncore_imc_free_running_1/data_total/              [Kernel PMU event]
  uncore_imc_free_running_1/data_write/              [Kernel PMU event]
...
```

The PMUs are sorted by name then suffix as a part of this change.

v5: Improved the 2nd patch's commit message and removed an unused
    variable as suggested by Kan Liang <kan.liang@xxxxxxxxxxxxxxx>.
v4: Rebase on top of lazy PMU changes. Ignore numeric ordering due to
    gaps, suggested by Kan Liang <kan.liang@xxxxxxxxxxxxxxx>. Fold
    patches 2 & 3 as suggested by John Garry <john.g.garry@xxxxxxxxxx>
    (done by accident as part of rebasing).
v3: Add detail to patch 1 sorting commit message about the suffix and
    why sorting is necessary.
v2: List all PMUs when "-v" is passed as suggested by John Garry
    <john.g.garry@xxxxxxxxxx>.

Ian Rogers (2):
  perf pmus: Sort pmus by name then suffix
  perf pmus: Skip duplicate PMUs and don't print list suffix by default

 tools/perf/builtin-list.c         |  8 +++
 tools/perf/util/pmu.c             | 17 ++++--
 tools/perf/util/pmu.h             |  3 +-
 tools/perf/util/pmus.c            | 99 ++++++++++++++++++++++++++++++-
 tools/perf/util/pmus.h            |  2 +
 tools/perf/util/print-events.h    |  1 +
 tools/perf/util/s390-sample-raw.c |  3 +-
 7 files changed, 123 insertions(+), 10 deletions(-)

-- 
2.42.0.rc2.253.gd59a3bf2b4-goog