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authorSlava Pestov <slavapestov@google.com>2011-07-16 01:23:58 +0400
committerSteven Rostedt <rostedt@goodmis.org>2012-11-01 00:45:27 +0400
commit884bfe89a462fcc85c8abd96171519cf2fe70929 (patch)
treebe61b3c6ee4d75198af22f5cdadc3b289b207bda /include/linux/ring_buffer.h
parentf43c738bfa8608424610e4fc1aef4d4644e2ce11 (diff)
downloadlinux-884bfe89a462fcc85c8abd96171519cf2fe70929.tar.xz
ring-buffer: Add a 'dropped events' counter
The existing 'overrun' counter is incremented when the ring buffer wraps around, with overflow on (the default). We wanted a way to count requests lost from the buffer filling up with overflow off, too. I decided to add a new counter instead of retro-fitting the existing one because it seems like a different statistic to count conceptually, and also because of how the code was structured. Link: http://lkml.kernel.org/r/1310765038-26399-1-git-send-email-slavapestov@google.com Signed-off-by: Slava Pestov <slavapestov@google.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ring_buffer.h')
-rw-r--r--include/linux/ring_buffer.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index 6c8835f74f79..2007375cfe77 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -166,6 +166,7 @@ unsigned long ring_buffer_overruns(struct ring_buffer *buffer);
unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu);
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);
u64 ring_buffer_time_stamp(struct ring_buffer *buffer, int cpu);
void ring_buffer_normalize_time_stamp(struct ring_buffer *buffer,