On Tue, 19 Jul 2022 10:25:14 +0200
Daniel Wagner <dwagner@xxxxxxx> wrote:
> > You can enable an ftrace instance from inside the kernel, and make it a
> > compile time option.
> >
> > #include <linux/trace_events.h>
> > #include <linux/trace.h>
> >
> > struct trace_array *tr;
> >
> > tr = trace_array_get_by_name("qla2xxx");
> > trace_array_set_clr_event(tr, "qla", NULL, true);
> >
> > And now you have trace events running:
> >
> > # cat /sys/kernel/tracing/instances/qla/trace
The above should be:
# cat /sys/kernel/tracing/instances/qla2xxx/trace
as the instance name is the string sent to trace_array_get_by_name().
-- Steve
