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    Subject[PATCH 4.14 075/159] perf test: Fix test 21 for s390x
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Thomas Richter <tmricht@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 <tmricht@linux.vnet.ibm.com>
    Reviewed-by: Hendrik 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: Arnaldo Carvalho de Melo <acme@redhat.com>
    Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@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;
    +#else
    evsel->attr.sample_freq = 1;
    +#endif
    evsel->attr.inherit = 0;
    evsel->attr.watermark = 0;
    evsel->attr.wakeup_events = 1;

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