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Date:   Fri, 24 Nov 2017 12:02:25 -0300
From:   Arnaldo Carvalho de Melo <>
To:     Ingo Molnar <>
        Thomas Richter <>,
        Martin Schwidefsky <>,
        Arnaldo Carvalho de Melo <>
Subject: [PATCH 04/11] perf test: Fix test 21 for s390x

From: Thomas Richter <>

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 <>
Reviewed-by: Hendrik Brueckner <>
Cc: Martin Schwidefsky <>
Signed-off-by: Arnaldo Carvalho de Melo <>
 tools/perf/tests/task-exit.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/tests/task-exit.c b/tools/perf/tests/task-exit.c
index 98c098475e71..5d06ac81f7f1 100644
--- 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 __maybe_unused, int subtest __maybe_unused
 	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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