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 <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Fri Feb 23 11:45:09 CET 2018
From: Thomas Richter <tmricht@xxxxxxxxxxxxxxxxxx>
Date: Thu, 23 Nov 2017 12:46:11 +0100
Subject: perf test: Fix test 21 for s390x
From: Thomas Richter <tmricht@xxxxxxxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Hendrik Brueckner <brueckner@xxxxxxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
LPU-Reference: 20171123114611.93397-1-tmricht@xxxxxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/n/tip-1ynblyhi1n81idpido59nt1y@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
Patches currently in stable-queue which might be from tmricht@xxxxxxxxxxxxxxxxxx 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