linux-kernel - Re: [PATCH v3] trace: Add x86 irq vector entry/exit tracepoints

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Message-ID: <CAL26m8KYPCoJzRVsVXCmEAqXKiaRGZu840potVD+83JR27tfCg@mail.gmail.com>
Date:	Wed, 6 Jul 2011 14:50:11 -0700
From:	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Michael Rubin <mrubin@...gle.com>,
	David Sharp <dhsharp@...gle.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Jiaying Zhang <jiayingz@...gle.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
Subject: Re: [PATCH v3] trace: Add x86 irq vector entry/exit tracepoints

On Tue, Jun 21, 2011 at 11:45 AM, Vaibhav Nagarnaik
<vnagarnaik@...gle.com> wrote:
> From: Jiaying Zhang <jiayingz@...gle.com>
>
> The current interrupt trace of irq_handler_entry and irq_handler_exit
> give traces of when an interrupt is handled. They provide good data
> about when the system is running in kernel space and how it affects the
> currently running applications.
>
> Apart from this, they are IRQ vectors which trigger the system into
> kernel space. Tracing such events gives us the trace of where the system
> is spending its time. We want to know which cores are handling
> interrupts and how they are affecting other processes in the system.
> Also, the trace provides information about when the cores are idle and
> which interrupts are changing that state.
>
> The following patch adds the event definition and trace instrumentation
> for interrupt vectors. A lookup table is provided to print out readable
> IRQ vector names. Apart from the IRQ vectors handled in the generic
> kernel code, some x86 specific IRQ vectors are also traced. The lookup
> table can be extended by adding other arch-specific IRQ vectors.
>
> Changelog:
> v2-v3
> * Move the irq_vector_{entry|exit} tracepoints back under irq/ sub
>  folder
> * Trace the common IRQs in generic kernel code so that all archs can
>  benefit.
>
> v1-v2
> * Move the irq_vector_{entry|exit} tracepoints under irq_vectors/ sub
>  folder
>
> Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@...gle.com>

Hi All

Can you please take a look at this patch? Does it cover all the generic
IRQ handlers so they are traced?



Thanks

Vaibhav Nagarnaik
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