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ring-buffer: Allow ring_buffer_event_time_stamp() to return time stamp of all events

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Currently, ring_buffer_event_time_stamp() only returns an accurate time
stamp of the event if it has an absolute extended time stamp attached to
it. To make it more robust, use the event_stamp() in case the event does
not have an absolute value attached to it.

This will allow ring_buffer_event_time_stamp() to be used in more cases
than just histograms, and it will also allow histograms to not require
including absolute values all the time.

Link: https://lkml.kernel.org/r/20210316164113.704830885@goodmis.org

Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware)
2021-03-16 12:41:04 -04:00
parent b47e330231
commit efe6196a6b
3 changed files with 48 additions and 17 deletions
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3
include/linux/ring_buffer.h
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@@ -61,7 +61,8 @@ enum ring_buffer_type {
unsigned ring_buffer_event_length(struct ring_buffer_event *event);
void *ring_buffer_event_data(struct ring_buffer_event *event);
u64 ring_buffer_event_time_stamp(struct ring_buffer_event *event);
u64 ring_buffer_event_time_stamp(struct trace_buffer *buffer,
struct ring_buffer_event *event);
/*
* ring_buffer_discard_commit will remove an event that has not