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

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Message-ID: <20081002153305.057cf6d9@infradead.org>
Date:	Thu, 2 Oct 2008 15:33:05 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Greg KH <greg@...ah.com>
Cc:	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 Thu, 2 Oct 2008 14:31:46 -0700
Greg KH <greg@...ah.com> wrote:

> On Thu, Oct 02, 2008 at 04:46:09PM +0200, Andi Kleen wrote:
> > Thomas Gleixner <tglx@...utronix.de> writes:
> > >
> > >  - move long running handlers out of the hard interrupt context
> > 
> > I'm not sure I'm really looking forward to this brave new world
> > of very long running interrupt handlers. e.g. what do you
> > do for example when some handler blocks for a very long time?
> 
> We have this issue today with some irqs (USB is known for issue
> here...)
> 
> So I don't think this is a big issue, and in the end, a better idea as
> it might force us to confront some of the big abusers and fix them.
> 

one of the things irq threads gives you is that 'top' will show you
which ones are eating cpu ;-)


-- 
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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