linux-kernel - Re: [PATCH 4/6] trace: Add tracepoints to reschedule interrupt handler

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Message-ID: <CAJL_ektnxUZaRJmx14H9psJ8MFBZ8iD5ET14WgT8CoJdMvH40w@mail.gmail.com>
Date:	Fri, 15 Jul 2011 10:50:07 -0700
From:	David Sharp <dhsharp@...gle.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	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>,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 4/6] trace: Add tracepoints to reschedule interrupt handler

On Fri, Jul 15, 2011 at 1:48 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Fri, 2011-07-15 at 00:02 +0200, Frederic Weisbecker wrote:
>> > This is a part of overall effort to trace all the interrupts happening
>> > in a system to figure out what time is spent in kernel space versus user
>> > space.
>
> How about you enable CONFIG_IRQ_TIME_ACCOUNTING and get all that?
>

It's not just about how long, it's when, and what other events the
interrupts are interacting with.
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