linux-kernel - Re: [PATCH 0/3] tracing/function-graph-tracer: signal interrupt triggering on output

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Message-Id: <1229328201.14605.6.camel@twins>
Date:	Mon, 15 Dec 2008 09:03:21 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] tracing/function-graph-tracer: signal interrupt
 triggering on output

On Sat, 2008-12-13 at 08:49 +0100, Ingo Molnar wrote:
> * Frédéric Weisbecker <fweisbec@...il.com> 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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