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

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Message-ID: <1311859702.2617.174.camel@laptop>
Date:	Thu, 28 Jul 2011 15:28:22 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
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, 2011-07-28 at 15:09 +0200, Frederic Weisbecker wrote:
> On Thu, Jul 28, 2011 at 02:53:52PM +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. 
> > 
> > Yeah so, he needs to touch arch code anyway.
> 
> He needs to touch arch code for pure arch interrupts or some cases
> where we don't have the choice. But otherwise there are many
> cases where we can put that in the generic code.

Which I just pointed out you can't, some 'generic' handlers are in fact
multiplexed on a single arch interrupt. If you want all interrupts, use
pure arch hooks at the lowest level and stop mucking about.


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