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

[Greg KH <greg@kroah.com>]

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