From: Robert Love <rml@novell.com>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: How is user space notified of CPU speed changes?
Date: Sun, 24 Oct 2004 16:02:12 -0400 [thread overview]
Message-ID: <1098648132.5843.5.camel@localhost> (raw)
In-Reply-To: <1098508238.13176.17.camel@krustophenia.net>
On Sat, 2004-10-23 at 01:10 -0400, Lee Revell wrote:
> OK, thanks. Still no answer to my original question though.
>
> JACK makes extensive use of microsecond-level timers. These must be
> calibrated at startup, and recalibrated when the CPU speed changes. How
> does JACK register with the kernel to be notified when the CPU speed
> changes?
Ignoring all of these meta-issues like whether or not JACK actually
should be checking the CPU speed: Yes, I think that doing a kevent tied
to the processor object when the speed changes is an absolutely ideal
use of the kernel event layer.
HAL would use it, too.
Robert Love
next prev parent reply other threads:[~2004-10-24 20:03 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-21 23:01 How is user space notified of CPU speed changes? Lee Revell
2004-10-22 11:23 ` Alan Cox
2004-10-22 14:12 ` Con Kolivas
2004-10-22 18:05 ` Lee Revell
2004-10-22 18:57 ` Andreas Dilger
2004-10-22 19:40 ` Chris Friesen
2004-10-22 19:46 ` Lee Revell
2004-10-22 20:28 ` Alan Cox
2004-10-22 21:46 ` Chris Friesen
2004-10-22 23:25 ` Lee Revell
2004-10-25 15:28 ` Chris Friesen
2004-10-23 5:10 ` Lee Revell
2004-10-23 10:53 ` Matthew Garrett
2004-10-23 21:19 ` Alan Cox
2004-10-23 22:42 ` Lee Revell
2004-10-23 23:17 ` Jon Masters
2004-10-24 1:40 ` Lee Revell
2004-10-24 14:02 ` Alan Cox
2004-10-26 2:38 ` Lee Revell
2004-10-26 4:05 ` Lee Revell
2004-10-23 23:35 ` Jon Masters
2004-10-23 23:36 ` Jon Masters
2004-10-24 14:04 ` Alan Cox
2004-10-25 5:53 ` Joel Becker
2004-10-24 20:02 ` Robert Love [this message]
[not found] <1098399709.4131.23.camel@krustophenia.net.suse.lists.linux.kernel>
[not found] ` <1098444170.19459.7.camel@localhost.localdomain.suse.lists.linux.kernel>
[not found] ` <1098508238.13176.17.camel@krustophenia.net.suse.lists.linux.kernel>
[not found] ` <1098566366.24804.8.camel@localhost.localdomain.suse.lists.linux.kernel>
2004-10-23 23:54 ` Andi Kleen
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