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SubjectRe: [PATCH] tracing/ftrace: add missing wake-up on some callsites

On Mon, 23 Feb 2009, Ingo Molnar wrote:

>
> * Steven Rostedt <rostedt@goodmis.org> wrote:
>
> > > Which would send a delayed work to wake up?
> >
> > No, I was thinking that trace_delay_wake_up() would be called
> > by these dangerous call sites. Then a per_cpu flag could be
> > set. We could have a trace point in the scheduler code that is
> > outside holding a runqueue lock, and this trace point would
> > call a trace function that will clear the per cpu flag, and
> > then call trace_wake_up().
>
> No, that's very roundabout and ugly. If we putting a tracepoint
> there we might as well put real scheduler code there that looks
> for such a flag. But i'm not convinced we need a flag ...

Just a suggestion. I was trying to keep the tracer from being an overhead.
But what else would you suggest? Just having the scheduler call
trace_wakeup?

-- Steve



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