4.14-stable review patch.  If anyone has any objections, please let me know.


From: Thomas Richter <tmri...@linux.vnet.ibm.com>

[ Upstream commit 996548499df61babae5306544c7daf5fd39db31c ]

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: Thomas Richter <tmri...@linux.vnet.ibm.com>
Reviewed-by: Hendrik Brueckner <brueck...@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidef...@de.ibm.com>
LPU-Reference: 20171123114611.93397-1-tmri...@linux.vnet.ibm.com
Link: https://lkml.kernel.org/n/tip-1ynblyhi1n81idpido59n...@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
 tools/perf/tests/task-exit.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/tools/perf/tests/task-exit.c
+++ b/tools/perf/tests/task-exit.c
@@ -84,7 +84,11 @@ int test__task_exit(struct test *test __
        evsel = perf_evlist__first(evlist);
        evsel->attr.task = 1;
+#ifdef __s390x__
+       evsel->attr.sample_freq = 1000000;
        evsel->attr.sample_freq = 1;
        evsel->attr.inherit = 0;
        evsel->attr.watermark = 0;
        evsel->attr.wakeup_events = 1;

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