perf test: Add checking for perf stat CSV output.

Counts expected fields for various commands. No testing added for
summary mode since it is broken.

An example of the summary output is:

         summary,263831,,instructions:u,1435072,100.0,0.46,insn per cycle
,,,,,1.37,stalled cycles per insn

This should be:

         summary,263831,,instructions:u,1435072,100.0,0.46,insn per cycle
         summary,,,,,,1.37,stalled cycles per insn

The output has 7 fields when it should have 8. Additionally, the newline
spacing is wrong, so it was excluded from testing until a fix is made.

Committer testing:

  $ perf test "perf stat CSV output"
   88: perf stat CSV output linter                                     : Ok
  $

  $ perf test -v "perf stat CSV output"
  Couldn't bump rlimit(MEMLOCK), failures may take place when creating BPF maps, etc
   88: perf stat CSV output linter                                     :
  --- start ---
  test child forked, pid 2622839
  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
  $

I did a s/parnoia/paranoid/g on the [Skip] lines.

Signed-off-by: Claire Jensen <cjense@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alyssa Ross <hi@alyssa.is>
Cc: Claire Jensen <clairej735@gmail.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Like Xu <likexu@tencent.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20220525053814.3265216-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/tools/perf/tests/shell/lib/perf_csv_output_lint.py b/tools/perf/tests/shell/lib/perf_csv_output_lint.py
new file mode 100644
index 000000000000..714f283cfb1b
--- /dev/null
+++ b/tools/perf/tests/shell/lib/perf_csv_output_lint.py
@@ -0,0 +1,48 @@
+#!/usr/bin/python
+# SPDX-License-Identifier: GPL-2.0
+
+import argparse
+import sys
+
+# Basic sanity check of perf CSV output as specified in the man page.
+# Currently just checks the number of fields per line in output.
+
+ap = argparse.ArgumentParser()
+ap.add_argument('--no-args', action='store_true')
+ap.add_argument('--interval', action='store_true')
+ap.add_argument('--system-wide-no-aggr', action='store_true')
+ap.add_argument('--system-wide', action='store_true')
+ap.add_argument('--event', action='store_true')
+ap.add_argument('--per-core', action='store_true')
+ap.add_argument('--per-thread', action='store_true')
+ap.add_argument('--per-die', action='store_true')
+ap.add_argument('--per-node', action='store_true')
+ap.add_argument('--per-socket', action='store_true')
+ap.add_argument('--separator', default=',', nargs='?')
+args = ap.parse_args()
+
+Lines = sys.stdin.readlines()
+
+def check_csv_output(exp):
+  for line in Lines:
+    if 'failed' not in line:
+      count = line.count(args.separator)
+      if count != exp:
+        sys.stdout.write(''.join(Lines))
+        raise RuntimeError(f'wrong number of fields. expected {exp} in {line}')
+
+try:
+  if args.no_args or args.system_wide or args.event:
+    expected_items = 6
+  elif args.interval or args.per_thread or args.system_wide_no_aggr:
+    expected_items = 7
+  elif args.per_core or args.per_socket or args.per_node or args.per_die:
+    expected_items = 8
+  else:
+    ap.print_help()
+    raise RuntimeError('No checking option specified')
+  check_csv_output(expected_items)
+
+except:
+  sys.stdout.write('Test failed for input: ' + ''.join(Lines))
+  raise