Re: [Patch -tip 3/3] Tracing/ftrace: Don't consume entriesunhandled by mmiotrace

[Ingo Molnar]

* Frédéric Weisbecker <fweisbec@xxxxxxxxx> wrote:

> 2008/9/25 Pekka Paalanen <pq@xxxxxx>:
> > We can (must) return to this if/when multiple tracers are allowed
> > to be active simultaneously. But in the current situation, I do not
> > see a way to trace more than one thing, but I haven't really looked
> > into the other tracers.
> 
> You can enable another tracer simultaneously. I never tried it but you 
> can launch one from debugfs and another from kernel code for example. 
> The new boot tracer will have to launch the sched_switch tracer.

hm, right now i can see a lot of problems with that approach - the 
buffers are partly per tracer and partly global.

the new trace-ringbuffer design Steve is working on would abstract away 
this complication - then we could make tracers truly independent 
entities.

	Ingo
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