From: Arjan van de Ven <arjanv@redhat.com>
To: Peter Williams <peterw@aurema.com>
Cc: John Reiser <jreiser@BitWagon.com>,
Micha Feigin <michf@post.tau.ac.il>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: finding out the value of HZ from userspace
Date: Tue, 16 Mar 2004 07:33:31 +0100 [thread overview]
Message-ID: <20040316063331.GB23988@devserv.devel.redhat.com> (raw)
In-Reply-To: <40564A22.5000504@aurema.com>
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On Tue, Mar 16, 2004 at 11:28:18AM +1100, Peter Williams wrote:
> >Ugh that should say 100 on x86....
> >but..
> >param.h:# define USER_HZ 100 /* .. some user interfaces
> >are in "ticks" */
> >param.h:# define CLOCKS_PER_SEC (USER_HZ) /* like times() */
> >.....
> >that looks like 100 to me.
> >
>
> This horrible hack of converting all tick values to 100 (from 1000) for
> export to user space because a large number of user space programs
> assume that HZ is 100 would NOT be necessary if there was a mechanism
> whereby user space programs could find out how many ticks there are in a
> second instead of having to make assumptions.
there is one. Nothing uses it
(sysconf() provides this info)
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next prev parent reply other threads:[~2004-03-16 6:41 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <michf@post.tau.ac.il>
2004-03-11 14:17 ` finding out the value of HZ from userspace Micha Feigin
2004-03-13 17:24 ` Arjan van de Ven
2004-03-13 19:34 ` John Reiser
2004-03-13 19:38 ` Arjan van de Ven
2004-03-13 22:14 ` Micha Feigin
2004-03-13 22:32 ` Arjan van de Ven
2004-03-14 1:05 ` Micha Feigin
2004-03-14 1:49 ` Andrew Morton
2004-03-14 14:37 ` Micha Feigin
2004-03-16 0:28 ` Peter Williams
2004-03-16 6:33 ` Arjan van de Ven [this message]
2004-03-16 23:38 ` Peter Williams
2004-03-20 10:22 ` Arjan van de Ven
2004-03-20 11:28 ` Stefan Smietanowski
2004-03-20 11:41 ` Arjan van de Ven
2004-03-20 23:58 ` Peter Williams
2004-03-21 1:09 ` Tim Schmielau
2004-03-21 1:30 ` Peter Williams
2004-03-21 8:00 ` Kai Henningsen
2004-03-21 10:32 ` Stefan Smietanowski
2004-03-22 22:34 ` Micha Feigin
2004-03-22 23:04 ` Peter Williams
2004-03-25 17:40 ` Jamie Lokier
2004-03-25 23:22 ` Peter Williams
2004-03-27 13:31 ` Jamie Lokier
2004-03-27 23:52 ` Peter Williams
2004-03-28 12:16 ` Jamie Lokier
2004-03-27 21:11 ` Micha Feigin
2004-03-20 23:26 ` Peter Williams
2004-03-13 21:19 ` tabris
2004-03-13 22:10 ` Micha Feigin
2004-03-13 22:41 ` Arjan van de Ven
2004-03-14 1:07 ` Micha Feigin
2004-03-14 18:26 ` John Reiser
2004-03-14 2:45 ` Horst von Brand
2004-03-14 14:39 ` Micha Feigin
2004-03-15 8:17 ` Jamie Lokier
2004-03-16 18:16 ` Mark Gross
2004-03-15 10:13 ` Richard Curnow
[not found] ` <200403161757.48786.mgross@linux.intel.com>
[not found] ` <20040317023059.GD19564@mail.shareable.org>
2004-03-17 16:48 ` Call for HRT in 2.6 kernel was " Mark Gross
2004-03-17 20:07 ` Jamie Lokier
2004-03-17 21:25 ` Mark Gross
2004-03-18 1:19 ` Karim Yaghmour
2004-03-18 11:56 ` Jamie Lokier
2004-03-18 15:23 ` Karim Yaghmour
2004-03-21 1:55 ` Erik Andersen
2004-03-23 22:35 ` Karim Yaghmour
[not found] <1zkOe-Uc-17@gated-at.bofh.it>
[not found] ` <1zl7M-1eJ-43@gated-at.bofh.it>
[not found] ` <1zn9p-3mW-5@gated-at.bofh.it>
[not found] ` <1znj5-3wM-15@gated-at.bofh.it>
[not found] ` <1AaWr-655-7@gated-at.bofh.it>
2004-03-16 2:27 ` Andi Kleen
2004-03-16 5:53 ` Peter Williams
2004-03-16 6:16 ` Andi Kleen
2004-03-16 23:15 ` Peter Williams
2004-03-16 23:56 ` Andi Kleen
2004-03-17 0:15 ` Peter Williams
2004-03-16 9:16 ` Bernd Petrovitsch
2004-03-16 23:45 ` Peter Williams
2004-03-16 16:14 Albert Cahalan
2004-03-16 17:22 ` Richard Curnow
2004-03-20 9:56 ` Arjan van de Ven
2004-03-20 14:54 ` Albert Cahalan
2004-03-20 23:58 ` Peter Williams
2004-03-31 21:40 ` Randy.Dunlap
2004-03-31 23:46 ` Albert Cahalan
2004-04-01 15:54 ` Jamie Lokier
2004-04-01 16:01 ` Arjan van de Ven
2004-04-01 16:30 ` Jamie Lokier
2004-04-01 16:50 ` Richard B. Johnson
2004-04-01 17:01 ` Jamie Lokier
2004-04-01 21:27 ` Michael Buesch
2004-04-02 0:16 ` Peter Williams
2004-04-02 0:07 ` Peter Williams
2004-04-02 0:39 ` Jamie Lokier
2004-04-02 1:44 ` Peter Williams
2004-04-02 18:28 ` Tim Bird
2004-04-02 22:05 ` Peter Williams
2004-04-01 16:12 ` Albert Cahalan
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