Re: [RFC] BTS based perf user callchains
From: Peter Zijlstra
Date: Mon Aug 02 2010 - 15:47:29 EST
On Mon, 2010-08-02 at 20:41 +0200, Frederic Weisbecker wrote:
> On Mon, Aug 02, 2010 at 08:38:52PM +0200, Peter Zijlstra wrote:
> > 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.
> Ok. So the buffer is cut on schedule time. It might be nice
> to maintain the buffer progress across scheduling.
We flush it into the perf data buffer.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/