Re: [PATCH 1/2] ftrace: Add separate handler for ftrace:function event

[Steven Rostedt]

On Wed, 25 Nov 2015 18:12:43 +0100
Jiri Olsa <jolsa@xxxxxxxxxx> wrote:

> > Yeah, I'm trying to figure out the paths here. I would love to remove
> > the control_ops as that complicates the function tracing code a bit
> > more than I would like it to be.  
> 
> perf is using the control interface to enable and disable function
> tracing any time the process (and its events) is scheduled in/out
> 
> sched_in(event)  -> ftrace_function_local_enable(&event->ftrace_ops)
> sched_out(event) -> ftrace_function_local_disable(&event->ftrace_ops)

OK, I think we can merge the control list to the normal list and have
something like:

 (!op->disabled || !ftrace_function_local_disabled(op))

We can also keep the control flag for the ops, and have:

	!(op->flags & FTRACE_OPS_FL_CONTROL) || rcu_is_watching()

test too, and use the ftrace ops list code.

-- Steve
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