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authorSteven Rostedt <srostedt@redhat.com>2009-06-16 11:46:09 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-06-16 13:48:52 -0400
commit9086c7b90abbf4ec29543e8f2424e3ecd14e955d (patch)
treea65b9781b53b5eb2638dd65cf242547c33f0dd04 /kernel/trace/ring_buffer_benchmark.c
parentc7b0930857e2278f2e7714db6294e94c57f623b0 (diff)
downloadlwn-9086c7b90abbf4ec29543e8f2424e3ecd14e955d.tar.gz
lwn-9086c7b90abbf4ec29543e8f2424e3ecd14e955d.zip
ring-buffer: have benchmark test handle discarded events
With the addition of commit: c7b0930857e2278f2e7714db6294e94c57f623b0 ring-buffer: prevent adding write in discarded area The ring buffer may now add discarded events when a write passes the end of a buffer page. Before, a discarded event was only added when the tracer deliberately created one. The ring buffer benchmark test does not handle discarded events when it reads the buffer and fails when it encounters one. Also fix the increment for large data entries (luckily, the test did not add any yet). [ Impact: fix false failure of ring buffer self test ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ring_buffer_benchmark.c')
-rw-r--r--kernel/trace/ring_buffer_benchmark.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c
index 8d68e149a8b3..cf6b0f50134e 100644
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -102,8 +102,10 @@ static enum event_status read_page(int cpu)
event = (void *)&rpage->data[i];
switch (event->type_len) {
case RINGBUF_TYPE_PADDING:
- /* We don't expect any padding */
- KILL_TEST();
+ /* failed writes may be discarded events */
+ if (!event->time_delta)
+ KILL_TEST();
+ inc = event->array[0] + 4;
break;
case RINGBUF_TYPE_TIME_EXTEND:
inc = 8;
@@ -119,7 +121,7 @@ static enum event_status read_page(int cpu)
KILL_TEST();
break;
}
- inc = event->array[0];
+ inc = event->array[0] + 4;
break;
default:
entry = ring_buffer_event_data(event);