summaryrefslogtreecommitdiff
path: root/tools/perf/tests/builtin-test.c
diff options
context:
space:
mode:
authorWang Nan <wangnan0@huawei.com>2016-05-09 04:47:51 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-05-10 00:11:22 +0300
commitee74701ed8add8ad13e642e8618b51fd75add32d (patch)
tree0b41fe843428afbfedbffc703f8cdd4429f00b5a /tools/perf/tests/builtin-test.c
parente24c7520ea9c3e5bb51592c2134aafbf75a3f88a (diff)
downloadlinux-ee74701ed8add8ad13e642e8618b51fd75add32d.tar.xz
perf tests: Add test to check backward ring buffer
This test checks reading from backward ring buffer. Test result: # ~/perf test 'ring buffer' 45: Test backward reading from ring buffer : Ok The test case is a while loop which calls prctl(PR_SET_NAME) multiple times. Each prctl should issue 2 events: one PERF_RECORD_SAMPLE, one PERF_RECORD_COMM. The first round creates a relative large ring buffer (256 pages). It can afford all events. Read from it and check the count of each type of events. The second round creates a small ring buffer (1 page) and makes it overwritable. Check the correctness of the buffer. Signed-off-by: Wang Nan <wangnan0@huawei.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1462758471-89706-3-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/tests/builtin-test.c')
-rw-r--r--tools/perf/tests/builtin-test.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 93c467015e71..0e95c20ecf6e 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -208,6 +208,10 @@ static struct test generic_tests[] = {
.func = test__event_times,
},
{
+ .desc = "Test backward reading from ring buffer",
+ .func = test__backward_ring_buffer,
+ },
+ {
.func = NULL,
},
};