linux-kernel - Re: [patch 2/9] LTTng instrumentation

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Date:	Wed, 25 Mar 2009 09:47:24 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Jason Baron <jbaron@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, ltt-dev@...ts.casi.polymtl.ca,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Hideo AOKI <haoki@...hat.com>,
	Takashi Nishiie <t-nishiie@...css.fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: Re: [patch 2/9] LTTng instrumentation - irq


* Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:
> 
> > If we want to do this logically, without thinking about tracer 
> > performance impact, we could/should do :
> > 
> > trace_irq_entry(irqno, pt_regs)
> >   for_each_handler() {
> >     trace_irq_handler_entry(action)
> >     action->handler()
> >     trace_irq_handler_exit(ret)
> >   }
> > trace_irq_exit(retval)
> 
> Not really.

Put differently: we seem to agree on handler invocation entry/exit 
events (and those are handled by Jason's patch already), and that's 
good.

I dont think we need two events for physical IRQ events though. One 
is enough: entry event. What meaning does 'retval' have in your 
pseudo-code above? None typically.

	Ingo
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