Patch "perf test: Fix test 21 for s390x" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

    perf test: Fix test 21 for s390x

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     perf-test-fix-test-21-for-s390x.patch

and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Thomas Richter <[email protected]>
Date: Thu, 23 Nov 2017 12:46:11 +0100
Subject: perf test: Fix test 21 for s390x

From: Thomas Richter <[email protected]>

[ 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.

LPU-Reference: [email protected]

---
 tools/perf/tests/task-exit.c |    4 ++++
 1 file changed, 4 insertions(+)

@@ -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;

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/perf-test-fix-test-21-for-s390x.patch queue-4.14/perf-test-shell-fix-check-open-filename-arg-using-perf-trace-on-s390x.patch