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

Ian Rogers
2023-08-25T13:53:51Z

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@linux.intel.com>.
v4: Rebase on top of lazy PMU changes. Ignore numeric ordering due to
gaps, suggested by Kan Liang <kan.liang@linux.intel.com>. Fold
patches 2 & 3 as suggested by John Garry <john.g.garry@oracle.com>
(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@oracle.com>.

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(-)

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2.42.0.rc2.253.gd59a3bf2b4-goog