linux-kernel - Re: [PATCH v2 0/6] Add tracepoints to trace all system IRQs

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Message-ID: <20110728140808.GG11820@somewhere.redhat.com>
Date:	Thu, 28 Jul 2011 16:08:10 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Michael Rubin <mrubin@...gle.com>,
	David Sharp <dhsharp@...gle.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH v2 0/6] Add tracepoints to trace all system IRQs

On Thu, Jul 28, 2011 at 04:10:04PM +0200, Peter Zijlstra wrote:
> On Thu, 2011-07-28 at 14:31 +0200, Frederic Weisbecker wrote:
> > 
> > Because that requires to put the tracepoints in every interrupt sources
> > for every archs instead of putting one in the generic space. 
> 
> To sum up from IRC, yes that's exactly what you need to do, because this
> patch set assumes two things:
> 
>  1) that there is a 1:1 mapping between interrupt sources and generic
> handlers, and
> 
>  2) that there is a neglectable amount of arch specific code for each
> generic handler.
> 
> Both are false in generic. Therefore there is no option but to
> instrument each and every arch specific interrupt handler.
> 
> Also, please use a single tracepoint for all that instead of this horrid
> forest of random crap. Use something like arch_interrupt_enter(line_nr),
> arch_interrupt_exit(line_nr).

Right, so I guess the first iteration of the patchset was good in fact.
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