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| author |   Slava Pestov <slavapestov@google.com> | 2011-07-15 14:23:58 -0700 |
|---|---|---|
| committer |   Steven Rostedt <rostedt@goodmis.org> | 2012-10-31 16:45:27 -0400 |
| commit | 884bfe89a462fcc85c8abd96171519cf2fe70929 (patch) | |
| tree | be61b3c6ee4d75198af22f5cdadc3b289b207bda /include | |
| parent | tracing: Change tracer's integer flags to bool (diff) | |
| download | linux-dev-884bfe89a462fcc85c8abd96171519cf2fe70929.tar.xz linux-dev-884bfe89a462fcc85c8abd96171519cf2fe70929.zip | |
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')
| -rw-r--r-- | include/linux/ring_buffer.h | 1 |
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, |