Re: [PATCH] perf test: Speed up some tests using perf list

[James Clark]

On 16/10/2024 7:56 am, Namhyung Kim wrote:
> On my system, perf list is very slow to print the whole events.  I think
> there's a performance issue in SDT and uprobes event listing.  I noticed
> this issue while running perf test on x86 but it takes long to check
> some CoreSight event which should be skipped quickly.
>
> Anyway, some test uses perf list to check whether the required event is
> available before running the test.  The perf list command can take an
> argument to specify event class or (glob) pattern.  But glob pattern is
> only to suppress output for unmatched ones after checking all events.
>
> In this case, specifying event class is better to reduce the number of
> events it checks and to avoid buggy subsystems entirely.
>
> No functional changes intended.
>
> Cc: German Gomez <german.gomez@xxxxxxx>
> Cc: Carsten Haitzler <carsten.haitzler@xxxxxxx>
> Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
> ---

Reviewed-by: James Clark <james.clark@xxxxxxxxxx>