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%3Ba=su...
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@vger.kernel.org know about it.
From foo@baz Fri Feb 23 11:45:09 CET 2018
From: Thomas Richter tmricht@linux.vnet.ibm.com Date: Thu, 23 Nov 2017 12:46:11 +0100 Subject: perf test: Fix test 21 for s390x
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;
Patches currently in stable-queue which might be from tmricht@linux.vnet.ibm.com 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