linux-kernel - Re: [patch 1/3] hpet: factor timer allocate from open

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Message-ID: <4C4D2913.8020200@ladisch.de>
Date:	Mon, 26 Jul 2010 08:20:03 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	akpm@...ux-foundation.org, John Stultz <johnstul@...ibm.com>,
	maglyx@...il.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch 1/3] hpet: factor timer allocate from open

Thomas Gleixner wrote:
> On Tue, 20 Jul 2010, akpm@...ux-foundation.org wrote:
> > From: Magnus Lynch <maglyx@...il.com>
> > 
> > The current implementation of the /dev/hpet driver couples opening the
> > device with allocating one of the (scarce) timers (aka comparators).  This
> > is a limitation in that the main counter may be valuable to applications
> > seeking a high-resolution timer who have no use for the interrupt
> > generating functionality of the comparators.
> 
> And how exactly does this patch provide such functionality ? There is
> no interface which allows you to access the counter itself.

Through mmap(); this is the only interface of /dev/hpet that is actually
used in practice.

> Cc: Clemens Ladisch <clemens@...isch.de>

Acked-by: Clemens Ladisch <clemens@...isch.de>


Regards,
Clemens
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