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| author | Tom Zanussi <zanussi@kernel.org> | 2020-01-29 12:59:27 -0600 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-01-30 09:46:28 -0500 |
| commit | 8dcc53ad956d2caf4c5c2dda196e6801b71a3154 (patch) | |
| tree | f2e7e008fe1a5cd8c705748a00234d33416d439c /include/linux/trace_events.h | |
| parent | 35ca5207c2d111abb9e072f028945d5c12b20836 (diff) | |
| download | linux-8dcc53ad956d2caf4c5c2dda196e6801b71a3154.tar.gz linux-8dcc53ad956d2caf4c5c2dda196e6801b71a3154.tar.bz2 linux-8dcc53ad956d2caf4c5c2dda196e6801b71a3154.zip | |
tracing: Add synth_event_trace() and related functions
Add an exported function named synth_event_trace(), allowing modules
or other kernel code to trace synthetic events.
Also added are several functions that allow the same functionality to
be broken out in a piecewise fashion, which are useful in situations
where tracing an event from a full array of values would be
cumbersome. Those functions are synth_event_trace_start/end() and
synth_event_add_(next)_val().
Link: http://lkml.kernel.org/r/7a84de5f1854acf4144b57efe835ca645afa764f.1580323897.git.zanussi@kernel.org
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/trace_events.h')
| -rw-r--r-- | include/linux/trace_events.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h index 07b83532a3c6..bf03d12efb28 100644 --- a/include/linux/trace_events.h +++ b/include/linux/trace_events.h @@ -416,6 +416,32 @@ extern int synth_event_add_fields(struct dynevent_cmd *cmd, #define synth_event_gen_cmd_end(cmd) \ dynevent_create(cmd) +struct synth_event; + +struct synth_event_trace_state { + struct trace_event_buffer fbuffer; + struct synth_trace_event *entry; + struct trace_buffer *buffer; + struct synth_event *event; + unsigned int cur_field; + unsigned int n_u64; + bool enabled; + bool add_next; + bool add_name; +}; + +extern int synth_event_trace(struct trace_event_file *file, + unsigned int n_vals, ...); +extern int synth_event_trace_array(struct trace_event_file *file, u64 *vals, + unsigned int n_vals); +extern int synth_event_trace_start(struct trace_event_file *file, + struct synth_event_trace_state *trace_state); +extern int synth_event_add_next_val(u64 val, + struct synth_event_trace_state *trace_state); +extern int synth_event_add_val(const char *field_name, u64 val, + struct synth_event_trace_state *trace_state); +extern int synth_event_trace_end(struct synth_event_trace_state *trace_state); + /* * Event file flags: * ENABLED - The event is enabled |