From ee74701ed8add8ad13e642e8618b51fd75add32d Mon Sep 17 00:00:00 2001 From: Wang Nan Date: Mon, 9 May 2016 01:47:51 +0000 Subject: 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 Tested-by: Arnaldo Carvalho de Melo Cc: Peter Zijlstra Cc: Zefan Li 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 --- tools/perf/tests/builtin-test.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'tools/perf/tests/builtin-test.c') 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 @@ -207,6 +207,10 @@ static struct test generic_tests[] = { .desc = "Test events times", .func = test__event_times, }, + { + .desc = "Test backward reading from ring buffer", + .func = test__backward_ring_buffer, + }, { .func = NULL, }, -- cgit v1.2.3-59-g8ed1b