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tracing: add ring_buffer_event_discard() to ring buffer

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This patch overloads RINGBUF_TYPE_PADDING to provide a way to discard
events from the ring buffer, for the event-filtering mechanism
introduced in a subsequent patch.

I did the initial version but thanks to Steven Rostedt for adding
the parts that actually made it work. ;-)

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tom Zanussi 2009-03-22 03:30:49 -05:00 • committed by Ingo Molnar
parent cf027f645e
commit 2d622719f1
2 changed files with 105 additions and 23 deletions
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11
include/linux/ring_buffer.h
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@ -18,10 +18,13 @@ struct ring_buffer_event {
/**
* enum ring_buffer_type - internal ring buffer types
*
* @RINGBUF_TYPE_PADDING: Left over page padding
* array is ignored
* size is variable depending on how much
* @RINGBUF_TYPE_PADDING: Left over page padding or discarded event
* If time_delta is 0:
* array is ignored
* size is variable depending on how much
* padding is needed
* If time_delta is non zero:
* everything else same as RINGBUF_TYPE_DATA
*
* @RINGBUF_TYPE_TIME_EXTEND: Extend the time delta
* array[0] = time delta (28 .. 59)
@ -65,6 +68,8 @@ ring_buffer_event_time_delta(struct ring_buffer_event *event)
return event->time_delta;
}
void ring_buffer_event_discard(struct ring_buffer_event *event);
/*
* size is in bytes for each per CPU buffer.
*/