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Date: Tue, 9 Sep 2008 10:01:44 -0700
From: Arjan van de Ven <arjan@infradead.org>
To: Stephen Hemminger <shemminger@vyatta.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, jbarnes@virtuousgeek.org,
       bhutchings@solarflare.com, linux-pci@vger.kernel.org,
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Subject: Re: [PATCH 1/3] PCI: vpd handle longer delays in access
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On Tue, 9 Sep 2008 09:55:48 -0700
Stephen Hemminger <shemminger@vyatta.com> wrote:

> On Mon, 8 Sep 2008 14:26:05 -0700
> Arjan van de Ven <arjan@infradead.org> wrote:
> 
> > On Mon, 8 Sep 2008 14:08:24 -0700
> > Stephen Hemminger <shemminger@vyatta.com> wrote:
> > 
> > > 
> > > What is a good way to say "i am polling for a while"?
> > 
> > 
> > can you take a fixed time delay?
> > 
> > or use cond_resched()
> cond_resched sounds like the best suggestion.  The problem is that
> this code needs to deal with hardware that could be fast, or slow
> depending on how the device is implemented.  

one option is poll fast for <X jiffies> and then back off with sleeping
delays



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org