linux-kernel - Re: [PATCH 1/2] trace,x86: Add tracepoint to x86 timer interrupt handler

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Message-ID: <CAL26m8JH7CyEdYUXtiC8fOmtSzeteFez2h-aWqJu06Lo77npAQ@mail.gmail.com>
Date:	Wed, 21 Sep 2011 11:20:51 -0700
From:	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	Michael Rubin <mrubin@...gle.com>,
	David Sharp <dhsharp@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] trace,x86: Add tracepoint to x86 timer interrupt handler

On Wed, Sep 21, 2011 at 2:01 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Fri, 29 Jul 2011, Vaibhav Nagarnaik wrote:
>
>> The x86 timer interrupt handler is the only handler not traced in the
>> irq/irq_handler_{entry|exit} trace events.
>
> Nonsense. The timer irq (irq0) comes via the genirq interrupt handling
> and not via a special vector. So it's traced already.
>

Thanks for pointing it out, I confused the PIT/HPET for the local timer
vector.

Could you also take a look at the patches that add tracing for traps?
https://lkml.org/lkml/2011/5/3/455
https://lkml.org/lkml/2011/5/3/456



Vaibhav Nagarnaik
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