From: Arjan van de Ven <arjan@infradead.org>
To: markh@compro.net
Cc: "linux-os (Dick Johnson)" <linux-os@analogic.com>,
Jan Engelhardt <jengelh@medozas.de>,
"Kok, Auke" <auke-jan.h.kok@intel.com>,
"solsTiCe d'Hiver" <solstice.dhiver@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: no cpu MHz in /proc/cpuinfo on 2.6.25.4-rt6
Date: Wed, 11 Jun 2008 13:58:28 -0700 [thread overview]
Message-ID: <20080611135828.29f6a7d7@infradead.org> (raw)
In-Reply-To: <48503792.50003@compro.net>
On Wed, 11 Jun 2008 16:37:38 -0400
Mark Hounschell <markh@compro.net> wrote:
> > Mark
> >
>
> Ok, what would one use besides the tsc to take a fast high-res time
> stamp in a kernel module that could also be used in user land (same
> time source) to for instance calculate the the time between an event
> in the kernel to an event in user land?
>
> do_gettimeofday / gettimeofday are not really acceptable.
btw you also changed the problem from "what is the cpu frequency" to
"how usable is rdtsc for time". My entire point was that these weren't
related...
--
If you want to reach me at my work email, use arjan@linux.intel.com
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2008-06-11 20:58 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-10 19:52 solsTiCe d'Hiver
2008-06-10 20:13 ` Arjan van de Ven
2008-06-10 20:42 ` Kok, Auke
2008-06-11 12:42 ` Jan Engelhardt
2008-06-11 13:36 ` Arjan van de Ven
2008-06-11 13:52 ` Jan Engelhardt
2008-06-11 13:58 ` Arjan van de Ven
2008-06-11 14:14 ` linux-os (Dick Johnson)
2008-06-11 15:10 ` Peter Zijlstra
2008-06-11 15:36 ` Arjan van de Ven
2008-06-11 16:59 ` Mark Hounschell
2008-06-11 17:44 ` Arjan van de Ven
2008-06-11 17:54 ` Mark Hounschell
2008-06-11 20:29 ` Arjan van de Ven
2008-06-11 20:37 ` Mark Hounschell
2008-06-11 20:55 ` Arjan van de Ven
2008-06-11 20:59 ` Mark Hounschell
2008-06-11 20:58 ` Arjan van de Ven [this message]
2008-06-11 21:08 ` Mark Hounschell
2008-06-11 21:28 ` Arjan van de Ven
2008-06-11 21:39 ` Chris Friesen
2008-06-11 23:08 ` Andi Kleen
2008-06-11 16:08 ` Ray Lee
2008-06-11 16:32 ` Arjan van de Ven
2008-06-11 12:40 ` Jan Engelhardt
2008-06-11 14:15 ` solsTiCe d'Hiver
2008-06-11 14:36 ` Jan Engelhardt
2008-06-11 15:35 ` solsTiCe d'Hiver
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