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| author |  Steven Rostedt (VMware) <rostedt@goodmis.org>
| 2021-03-16 12:41:07 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org>
| 2021-03-18 12:58:26 -0400 |
| commit | d8279bfc5e9598682f657606d3830ab65932cfe4 (patch) | |
| tree | 6cd284bd35cbf8ed816225a9dab28fb74fcce4c2 /kernel/trace | |
| parent | ring-buffer: Add verifier for using ring_buffer_event_time_stamp() (diff) | |
| download | linux-d8279bfc5e9598682f657606d3830ab65932cfe4.tar.gz linux-d8279bfc5e9598682f657606d3830ab65932cfe4.tar.bz2 linux-d8279bfc5e9598682f657606d3830ab65932cfe4.zip | |
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>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace.c | 8 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 1 |
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); |