Re: [PATCH 0/4] libtracefs: Creating synthetic events

[Steven Rostedt <rostedt@goodmis.org>]

On Wed, 21 Jul 2021 23:39:13 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
> 
> Add an interface to libtracefs that makes it easy to create synthetic
> events. For example:
> 

I forgot to add (although it's in the man page)

	#define start_event "sched_waking"
	#define start_field "pid"

	#define end_event "sched_switch"
	#define end_field "next_pid"

	#define match_name "pid"

-- Steve


> 	struct tracefs_synth *synth;
> 	struct tep_handle *tep;
> 	struct trace_seq seq;
> 
> 	/* Load all events from the system */
> 	tep = tracefs_local_events(NULL);
> 	
> 	/* Initialize the synthetic event */
> 	synth = tracefs_synth_init(tep, "wakeup_lat",
> 				   NULL, start_event,
> 				   NULL, end_event,
> 				   match_name,
> 				   start_field, end_field);
> 
> 	/* The tep is no longer needed */
> 	tep_free(tep);
> 
>