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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2021-03-16 12:41:07 -0400
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-03-18 12:58:26 -0400
commitd8279bfc5e9598682f657606d3830ab65932cfe4 (patch)
parenta948c69d6fb1ba749a958a8a87d4eecdda28989d (diff)
tracing: Add tracing_event_time_stamp() API
Add a tracing_event_time_stamp() API that checks if the event passed in is not on the ring buffer but a pointer to the per CPU trace_buffered_event which does not have its time stamp set yet. If it is a pointer to the trace_buffered_event, then just return the current time stamp that the ring buffer would produce. Otherwise, return the time stamp from the event. Link: https://lkml.kernel.org/r/20210316164114.131996180@goodmis.org Reviewed-by: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2 files changed, 9 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index b15436ff85e8..90ae3140756e 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -6972,6 +6972,14 @@ static int tracing_time_stamp_mode_open(struct inode *inode, struct file *file)
return ret;
+u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe)
+ if (rbe == this_cpu_read(trace_buffered_event))
+ return ring_buffer_time_stamp(buffer, smp_processor_id());
+ return ring_buffer_event_time_stamp(buffer, rbe);
* Set or disable using the per CPU trace_buffer_event when possible.
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index f2a7a72825c7..0d8f54f49a3a 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -372,6 +372,7 @@ extern int tracing_check_open_get_tr(struct trace_array *tr);
extern struct trace_array *trace_array_find(const char *instance);
extern struct trace_array *trace_array_find_get(const char *instance);
+extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe);
extern int tracing_set_filter_buffering(struct trace_array *tr, bool set);
extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);

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