commit ad964704ba9326d027fc10fd0099b7c880e50172
author Steven Rostedt (Red Hat) <rostedt@goodmis.org> Tue Jan 29 17:45:49 2013 -0500
committer Steven Rostedt <rostedt@goodmis.org> Wed Jan 30 11:01:53 2013 -0500
tree e08884c0f383e5b954233c323df67a3d726b6537
parent 03274a3ffb449632970fdd35da72ea41cf8474da

ring-buffer: Add stats field for amount read from trace ring buffer

Add a stat about the number of events read from the ring buffer:

 #  cat /debug/tracing/per_cpu/cpu0/stats
entries: 39869
overrun: 870512
commit overrun: 0
bytes: 1449912
oldest event ts:  6561.368690
now ts:  6565.246426
dropped events: 0
read events: 112    <-- Added

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

include/linux/ring_buffer.h

diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index 519777e..1342e69 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -167,6 +167,7 @@
 unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu);
 unsigned long ring_buffer_commit_overrun_cpu(struct ring_buffer *buffer, int cpu);
 unsigned long ring_buffer_dropped_events_cpu(struct ring_buffer *buffer, int cpu);
+unsigned long ring_buffer_read_events_cpu(struct ring_buffer *buffer, int cpu);
 
 u64 ring_buffer_time_stamp(struct ring_buffer *buffer, int cpu);
 void ring_buffer_normalize_time_stamp(struct ring_buffer *buffer,