linux-kernel - Re: [RFC patch 2/5] genirq: add a quick check handler

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Message-Id: <1222944709.26632.19.camel@perihelion.int.jonmasters.org>
Date:	Thu, 02 Oct 2008 06:51:49 -0400
From:	Jon Masters <jonathan@...masters.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	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>,
	Arjan van de Veen <arjan@...radead.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Sven Dietrich <sdietrich@...e.de>
Subject: Re: [RFC patch 2/5] genirq: add a quick check handler

On Thu, 2008-10-02 at 01:09 -0400, Steven Rostedt wrote:
> On Wed, 1 Oct 2008, Jon Masters wrote:
> > 
> > We probably need some documentation eventually so people realize what
> > this "quickcheck" handler is for and what it's not for - under no
> > circumstances should anything more than the bare minimum be done.
> > Otherwise it breaks the benefit of deferred threaded handling. It's hard
> > to enforce that - but this is *not* a return of top/bottom half handling
> > where you can do whatever crap you like in the quickcheck bit.
> > 
> 
> We could always implement something similar to what I was told Microsoft 
> does (I was just told this, I don't know for fact). Time this function and 
> if it takes longer than, say 50us, print a warning and kill the device
> ;-)

You know, it's funny you suggested that because I thought about going
there. But there's probably some silly patent on that groundshattering
Microsoft solution to the halting problem.

Anyway, I like to think we in the Linux community trust developers to do
the right thing more than Microsoft does :)

Jon.


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