Re: [PATCH 0/3] tracing/function-graph-tracer: signal interrupttriggering on output

[Peter Zijlstra]

On Sat, 2008-12-13 at 08:49 +0100, Ingo Molnar wrote:
> * FrÃdÃric Weisbecker <fweisbec@xxxxxxxxx> wrote:
> 
> > > applied to tip/tracing/function-graph-tracer, thanks Frederic!
> > >
> > > The output looks really nice.
> > >
> > >        Ingo
> > >
> > 
> > Thanks :-)
> > 
> > If anyone  has other needs or suggestions about this tracer, don't
> > hesitate to request it.
> > I remember Peter suggested that the preempt count could be output.
> 
> that reminds me ... did you know about hardirq_count()? We could use it 
> to detect IRQ entries in a more generic way, instead of the section 
> trick?

hardirq_count() is set from __irq_enter(), which is too late, we've
already had all the ARCH irq code before that.



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