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

[Liang, Kan]

On 2023-08-25 9:52 a.m., Ian Rogers wrote:
> 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


Reviewed-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

Thanks,
Kan

> 
>  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(-)
>