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Commit 99654849 authored by Thomas Richter's avatar Thomas Richter Committed by Arnaldo Carvalho de Melo
Browse files

perf test: Fix test 21 for s390x 



Test case 21 (Number of exit events of a simple workload) fails on
s390x. The reason is the invalid sample frequency supplied for this
test. On s390x the minimum sample frequency is much higher (see output
of /proc/service_levels).

Supply a save sample frequency value for s390x to fix this.  The value
will be adjusted by the s390x CPUMF frequency convertion function to a
value well below the sysctl kernel.perf_event_max_sample_rate value.

Signed-off-by: default avatarThomas Richter <tmricht@linux.vnet.ibm.com>
Reviewed-by: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
LPU-Reference: 20171123114611.93397-1-tmricht@linux.vnet.ibm.com
Link: https://lkml.kernel.org/n/tip-1ynblyhi1n81idpido59nt1y@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 321a7c35

tools/perf/tests/task-exit.c

+4 −0
Original line number Diff line number Diff line
@@ -84,7 +84,11 @@ int test__task_exit(struct test *test __maybe_unused, int subtest __maybe_unused 


	evsel = perf_evlist__first(evlist);

	evsel->attr.task = 1;

#ifdef __s390x__

	evsel->attr.sample_freq = 1000000;

#else

	evsel->attr.sample_freq = 1;

#endif

	evsel->attr.inherit = 0;

	evsel->attr.watermark = 0;

	evsel->attr.wakeup_events = 1;