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

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Message-ID: <20081002220612.GB9201@kroah.com>
Date:	Thu, 2 Oct 2008 15:06:12 -0700
From:	Greg KH <greg@...ah.com>
To:	Jon Masters <jonathan@...masters.org>
Cc:	Steven Rostedt <rostedt@...dmis.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>,
	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, Oct 02, 2008 at 06:51:49AM -0400, Jon Masters wrote:
> 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 :)

"Trust, but verify" :)

We should just print out something if it takes longer than Xus, that way
we can fix the code, something that other operating systems can't do.

thanks,

greg k-h
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