linux-kernel - Re: [RFC patch 0/5] genirq: add infrastructure for threaded interrupt handlers

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Message-ID: <20081002204851.1836e465@infradead.org>
Date:	Thu, 2 Oct 2008 20:48:51 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Greg KH <greg@...ah.com>, Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jon Masters <jonathan@...masters.org>,
	Sven Dietrich <sdietrich@...e.de>
Subject: Re: [RFC patch 0/5] genirq: add infrastructure for threaded
 interrupt handlers

On Fri, 3 Oct 2008 05:25:04 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> > 
> > one of the things irq threads gives you is that 'top' will show you
> > which ones are eating cpu ;-)
> 
> oprofile does that job fine already and is imho any time preferable
> for detailed analysis.

while I don't disagree that oprofile will give you more detailed
results, I think there's a HUGE difference between asking a bugreporter
"can you paste a screen of 'top'" and "can you configure and run
oprofile".
CHances are good that the user already thought of top him/herself and
just reports "interrupt X is eating CPU" rather than "something seems
to be eating CPU".

I'm not going argue that this alone is enough justification for
irqthreads, but you can't deny it's an advantage.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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