perf stat: Do not fail on metrics on s390 z/VM systems

On s390 z/VM virtual machines command 'perf list' also displays metrics:

  # perf list | grep -A 20 'Metric Groups:'
  Metric Groups:

  No_group:
   cpi
        [Cycles per Instruction]
   est_cpi
        [Estimated Instruction Complexity CPI infinite Level 1]
   finite_cpi
        [Cycles per Instructions from Finite cache/memory]
   l1mp
        [Level One Miss per 100 Instructions]
   l2p
        [Percentage sourced from Level 2 cache]
   l3p
        [Percentage sourced from Level 3 on same chip cache]
   l4lp
        [Percentage sourced from Level 4 Local cache on same book]
   l4rp
        [Percentage sourced from Level 4 Remote cache on different book]
   memp
        [Percentage sourced from memory]
   ....
  #

The command

  # perf stat -M cpi -- true
  event syntax error: '{CPU_CYCLES/metric-id=CPU_CYCLES/.....'
                        \___ Bad event or PMU

  Unable to find PMU or event on a PMU of 'CPU_CYCLES'

   event syntax error: '{CPU_CYCLES/metric-id=CPU_CYCLES/...'
                        \___ Cannot find PMU `CPU_CYCLES'.
                             Missing kernel support?
 #

fails. 'perf stat' should not fail on metrics when the referenced CPU
Counter Measurement PMU is not available.

Output after:

  # perf stat -M est_cpi -- sleep 1

  Performance counter stats for 'sleep 1':

     1,000,887,494 ns   duration_time   #     0.00 est_cpi

       1.000887494 seconds time elapsed

       0.000143000 seconds user
       0.000662000 seconds sys

 #

Fixes: 7f76b31130680fb3 ("perf list: Add IBM z16 event description for s390")
Suggested-by: Ian Rogers <[email protected]>
Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: Thomas Richter <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Sumanth Korikkar <[email protected]>
Cc: Sven Schnelle <[email protected]>
Cc: Vasily Gorbik <[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