linux-kernel - [tip:perf/core] perf test: Fix test 21 for s390x

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Date:   Tue, 28 Nov 2017 22:35:36 -0800
From:   tip-bot for Thomas Richter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tmricht@...ux.vnet.ibm.com,
        tglx@...utronix.de, schwidefsky@...ibm.com,
        brueckner@...ux.vnet.ibm.com, mingo@...nel.org, acme@...hat.com,
        hpa@...or.com
Subject: [tip:perf/core] perf test: Fix test 21 for s390x

Commit-ID:  996548499df61babae5306544c7daf5fd39db31c
Gitweb:     https://git.kernel.org/tip/996548499df61babae5306544c7daf5fd39db31c
Author:     Thomas Richter <tmricht@...ux.vnet.ibm.com>
AuthorDate: Thu, 23 Nov 2017 12:46:11 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 28 Nov 2017 14:28:26 -0300

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: Thomas Richter <tmricht@...ux.vnet.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
LPU-Reference: 20171123114611.93397-1-tmricht@...ux.vnet.ibm.com
Link: https://lkml.kernel.org/n/tip-1ynblyhi1n81idpido59nt1y@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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 bc4a734..89c8e16 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;
+#else
 	evsel->attr.sample_freq = 1;
+#endif
 	evsel->attr.inherit = 0;
 	evsel->attr.watermark = 0;
 	evsel->attr.wakeup_events = 1;