perf test: Fix "perf stat CSV output linter" test on s390

perf test: Fix "perf stat CSV output linter" test on s390

perf test -F 83 ("perf stat CSV output linter") fails on s390.

Reason is the wrong number of fields for certain CPU core/die/socket
related output.

On x84_64 the output of command:

  # ./perf stat -x, -A -a --no-merge true
  CPU0,1.50,msec,cpu-clock,1502781,100.00,1.052,CPUs utilized
  CPU1,1.48,msec,cpu-clock,1476113,100.00,1.034,CPUs utilized
  ...

results in 8 fields with 7 comma separators.

On s390 the output of command:

  #  ./perf stat -x, -A -a --no-merge -- true
  0.95,msec,cpu-clock,949800,100.00,1.060,CPUs utilized
  ...

results in 7 fields with 6 comma separators. Therefore this tests
fails on s390. Similar issues exist for per-die and per-socket output
which is not supported on s390.

I have rewritten the python program to count commas in each output line
into a bash function to achieve the same result. I hope this makes it a
bit easier.

Output before:

  # ./perf test -F 83
  83: perf stat CSV output linter  :
  Checking CSV output: no args [Success]
  Checking CSV output: system wide [Success]
  Checking CSV output: system wide Checking CSV output: \
	  system wide no aggregation 6.92,msec,cpu-clock,\
	  6918131,100.00,6.972,CPUs utilized
  ...
  RuntimeError: wrong number of fields. expected 7 in \
	  6.92,msec,cpu-clock,6918131,100.00,6.972,CPUs utilized

  FAILED!
  #

Output after:

  # ./perf test -F 83
  83: perf stat CSV output linter             :
  Checking CSV output: no args [Success]
  Checking CSV output: system wide [Success]
  Checking CSV output: system wide Checking CSV output:\
	  system wide no aggregation [Success]
  Checking CSV output: interval [Success]
  Checking CSV output: event [Success]
  Checking CSV output: per core [Success]
  Checking CSV output: per thread [Success]
  Checking CSV output: per die [Success]
  Checking CSV output: per node [Success]
  Checking CSV output: per socket [Success]
  Ok
  #

Committer notes:

Continues to work on x86_64

  $ perf test lint
   89: perf stat CSV output linter                                     : Ok
  $ perf test -v lint
  Couldn't bump rlimit(MEMLOCK), failures may take place when creating BPF maps, etc
   89: perf stat CSV output linter                                     :
  --- start ---
  test child forked, pid 53133
  Checking CSV output: no args [Success]
  Checking CSV output: system wide [Skip] paranoid and not root
  Checking CSV output: system wide [Skip] paranoid and not root
  Checking CSV output: interval [Success]
  Checking CSV output: event [Success]
  Checking CSV output: per core [Skip] paranoid and not root
  Checking CSV output: per thread [Skip] paranoid and not root
  Checking CSV output: per die [Skip] paranoid and not root
  Checking CSV output: per node [Skip] paranoid and not root
  Checking CSV output: per socket [Skip] paranoid and not root
  test child finished with 0
  ---- end ----
  perf stat CSV output linter: Ok
  $

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Claire Jensen <cjense@google.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Sumanth Korikkar <sumanthk@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: linux390-list@tuxmaker.boeblingen.de.ibm.com
Link: https://lore.kernel.org/r/20220603113034.2009728-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>