linux-kernel - Re: [PATCH v2] trace: Add x86 irq vector entry/exit tracepoints

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Message-ID: <BANLkTin=9k8cMEtrvho-QkC3UgbNhcEvCP2mfh+qD1Tb+9GWVw@mail.gmail.com>
Date:	Tue, 21 Jun 2011 11:43:54 -0700
From:	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	David Sharp <dhsharp@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Michael Rubin <mrubin@...gle.com>, x86@...nel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiaying Zhang <jiayingz@...gle.com>
Subject: Re: [PATCH v2] trace: Add x86 irq vector entry/exit tracepoints

On Wed, Jun 15, 2011 at 8:02 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
> If a generic tracepoint can replace one per arch, we all want that instead.
> This is 24 times (24 archs) less maintainance burden.
>
> So if that doesn't meet your needs, you really need to explain us in detail why.
>
> I believe it's fine to deduce from a generic timer tracepoint that the arch fired
> a specific interrupt to achieve that.

OK. We were approaching this problem by treating the IRQ vector
tracepoint as being a arch specific one since it is easier to trace it
there and every arch can add their specific instrumentation.

Anyhow, I looked through the patch and changed it to have the IRQs
traced in their generic handlers rather than the arch-specific handlers.
I may have missed a place or two where a timer IRQ vector might be
handled.

I am sending this patch out in a few minutes.


Vaibhav Nagarnaik
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