Test case '105: perf stat tests' fails for s390.

[Thomas Richter <tmricht@linux.ibm.com>]

Ian,

test case '105: perf stat tests' fails for s390 (linux 7.0.0rc2) . It boils down to this command
 # ./perf stat -C 0-31 -a true
 Error:
 No supported events found.

The first bad commit is this one:
commit cee275edcdb1 ("perf metricgroup: Don't early exit if no CPUID table exists")

Before this commit the output of above command is:
Output before that commit:
./perf stat -C 0-31 -a true

 Performance counter stats for 'system wide':

       105      context-switches   #   3579.8 cs/sec  cs_per_second
     29.33 msec cpu-clock          #      7.8 CPUs  CPUs_utilized
        34      cpu-migrations     #   1159.2 migrations/sec  migrations_per_second
        52      page-faults        #   1772.9 faults/sec  page_faults_per_second
 5,026,832      cpu-cycles         #      0.2 GHz  cycles_frequency
 3,029,266      instructions       #      0.6 instructions  insn_per_cycle

0.000851608 seconds time elapsed

Since this is executed on an s390 LPAR, hardware event CPU_CYCLES is available, so it
should be used. This is something I will look into.

Also some other test cases fail after the bad commit:
 ./perf test 2>&1 | grep  FAILED
 99: perf stat CSV output linter                                     : FAILED!
102: perf stat JSON output linter                                    : FAILED!
104: perf stat STD output linter                                     : FAILED!
105: perf stat tests                                                 : FAILED!
133: perftool-testsuite_report                                       : FAILED!

Before the bad commit the output is
 ./perf test 2>&1 | grep FAILED
133: perftool-testsuite_report                                       : FAILED!

Any ideas where to look too narrow down the debuggung are very welcome.

Thanks a lot.

-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
--
IBM Deutschland Research & Development GmbH

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