linux-kernel - Re: [PATCH] tracing: Cleanup the convoluted softirq tracepoints

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Date:	Tue, 19 Oct 2010 10:46:39 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Koki Sanagi <sanagi.koki@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	nhorman@...driver.com, scott.a.mcmillan@...el.com,
	laijs@...fujitsu.com, "H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>, eric.dumazet@...il.com,
	kaneshige.kenji@...fujitsu.com, David Miller <davem@...emloft.net>,
	izumi.taku@...fujitsu.com, kosaki.motohiro@...fujitsu.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"Luck, Tony" <tony.luck@...el.com>
Subject: Re: [PATCH] tracing: Cleanup the convoluted softirq tracepoints

On Tue, 2010-10-19 at 16:07 +0200, Thomas Gleixner wrote:

> The vector computation is compared to the extra tracing induced jumps
> probably not even measurable. Stop defending horrible coding with
> handwavy performance and impact arguments.

Yes this was crappy code, I'm not defending it. But this code was from
the original tracepoints. I just looked at when this code was added, and
it was still in the time TRACE_EVENT() was in a major flux. Heck, the
code resided in include/trace/irq.h and not include/trace/events/irq.h.
And yes, a lot of decisions back then were put on handwaving performance
and impact, and it was not just coming from us.

I admit I should have cleaned it up, but I did not want to touch it
until it actually broke ;-)

-- Steve


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