perf parse-events: Move slots event for the hybrid platform too

The commit 94dbfd6781a0e87b ("perf parse-events: Architecture specific
leader override") introduced a feature to reorder the slots event to
fulfill the restriction of the perf metrics topdown group. But the
feature doesn't work on the hybrid machine.

  $ perf stat -e "{cpu_core/instructions/,cpu_core/slots/,cpu_core/topdown-retiring/}" -a sleep 1

   Performance counter stats for 'system wide':

       <not counted>      cpu_core/instructions/
       <not counted>      cpu_core/slots/
     <not supported>      cpu_core/topdown-retiring/

         1.002871801 seconds time elapsed

A hybrid platform has a different PMU name for the core PMUs, while
current perf hard code the PMU name "cpu".

Introduce a new function to check whether the system supports the perf
metrics feature. The result is cached for the future usage.

For X86, the core PMU name always has "cpu" prefix.

With the patch:

  $ perf stat -e "{cpu_core/instructions/,cpu_core/slots/,cpu_core/topdown-retiring/}" -a sleep 1

   Performance counter stats for 'system wide':

          76,337,010      cpu_core/slots/
          10,416,809      cpu_core/instructions/
          11,692,372      cpu_core/topdown-retiring/

         1.002805453 seconds time elapsed

Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: Kan Liang <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Xing Zhengjun <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions