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

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Date:	Thu, 2 Oct 2008 01:09:03 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jon Masters <jonathan@...masters.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 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
;-)

-- Steve

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