linux-kernel - Re: [PATCH] RTC: Add mmap method to rtc character driver

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Date:	Tue, 25 Jul 2006 14:43:28 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org, a.zummo@...ertech.it,
	jg@...edesktop.org
Subject: Re: [PATCH] RTC: Add mmap method to rtc character driver

On Tue, Jul 25, 2006 at 08:32:55PM +0200, Arjan van de Ven wrote:
> 
> > > 3) this will negate the power gain you get for tickless kernels, since
> > > now they need to start ticking again ;( )
> > > 
> > That is true, but only in the case where someone opens up /dev/rtc, and if they
> > open that driver and send it a UIE or PIE ioctl, it will start ticking
> > regardless of this patch (or that is at least my impression).
> 
> but.. if that's X like you said.. then it's basically "always"...
> 
Well, not always (considering the number of non-X embedded systems out there),
but I take your point.  So it really boils down to not having a tickless kernel,
or an X server that calls gettimeofday 1 million times per second (I think thats
the number that Dave threw out there).  Unless of course, you have a third
alternative, which, as I mentioned before I would be happy to take a crack at,
if you would elaborate on your idea a little more.

Thanks & Regards
Neil

> 
> -- 
> if you want to mail me at work (you don't), use arjan (at) linux.intel.com
> 
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