Re: [RFC] BTS based perf user callchains

Peter Zijlstra
2010-08-02T18:39:12Z

On Mon, 2010-08-02 at 20:35 +0200, Frederic Weisbecker wrote:
> I'm not even sure that will work. Also, while looking at the BTS implementation
> in perf, I see we have one BTS buffer per cpu. But that doesn't look right as
> the code flow is not linear per cpu but per task. Hence I suspect we need
> one BTS buffer per task. But may be someone tried that and encountered a
> problem?

IIRC we flush the buffer when we deschedule the counter.