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author | Wang Nan <wangnan0@huawei.com> | 2016-05-09 01:47:51 +0000 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-09 18:11:22 -0300 |
commit | ee74701ed8add8ad13e642e8618b51fd75add32d (patch) | |
tree | 0b41fe843428afbfedbffc703f8cdd4429f00b5a /tools/perf/tests/tests.h | |
parent | e24c7520ea9c3e5bb51592c2134aafbf75a3f88a (diff) | |
download | linux-ee74701ed8add8ad13e642e8618b51fd75add32d.tar.bz2 |
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/tests.h')
-rw-r--r-- | tools/perf/tests/tests.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h index 0fc946989cf0..c57e72c826d2 100644 --- a/tools/perf/tests/tests.h +++ b/tools/perf/tests/tests.h @@ -86,6 +86,7 @@ int test__synthesize_stat(int subtest); int test__synthesize_stat_round(int subtest); int test__event_update(int subtest); int test__event_times(int subtest); +int test__backward_ring_buffer(int subtest); #if defined(__arm__) || defined(__aarch64__) #ifdef HAVE_DWARF_UNWIND_SUPPORT |