From: Bernd Eckenfels <ecki-news2002-06@lina.inka.de>
To: linux-kernel@vger.kernel.org
Subject: Re: HZ, preferably as small as possible
Date: Fri, 12 Jul 2002 05:01:44 +0200 [thread overview]
Message-ID: <E17Sqgi-0002Pe-00@sites.inka.de> (raw)
In-Reply-To: <5.1.0.14.2.20020711201602.022387b0@whisper.qrpff.net>
In article <5.1.0.14.2.20020711201602.022387b0@whisper.qrpff.net> you wrote:
> Why must HZ be the same as 'interrupts per second'?
Well, it must not. But currently each timer interrupt the tick timestamp is
increased by one. So to find out how many seconds uptime you have (and other
things which are measured in timer ticks and passed to the userspace) you
need to know how many ticks have passed.
Actually there are a few things here, on the one hand, kernel should not
pass values in ticks to the userspace.
On the other hand having a changing HZ does not work for timespans measured
in those ticks, as long as those are not adjusted. One could think about
having a doze mode where only every 100th interruped is generated but it
increasedss the tick count by 100. Mst likely this will break a lot of
averaged measuring and stats counting, tough.
Greetings
Bernd
next prev parent reply other threads:[~2002-07-12 2:58 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-10 19:59 Grover, Andrew
2002-07-10 21:09 ` george anzinger
2002-07-11 6:03 ` Hannu Savolainen
2002-07-11 7:15 ` george anzinger
2002-07-12 0:36 ` Stevie O
2002-07-12 0:50 ` Thunder from the hill
2002-07-12 0:55 ` Robert Love
2002-07-12 0:58 ` Thunder from the hill
2002-07-12 1:24 ` Alan Cox
2002-07-12 1:37 ` Mark Hahn
2002-07-12 1:09 ` george anzinger
2002-07-12 1:26 ` Roland Dreier
2002-07-12 17:30 ` george anzinger
2002-07-12 1:35 ` Stevie O
2002-07-12 3:01 ` Bernd Eckenfels [this message]
2002-07-11 12:54 ` Thunder from the hill
2002-07-11 15:59 ` Martin Dalecki
2002-07-10 21:28 ` Andrew Morton
2002-07-10 21:35 ` Benjamin LaHaise
2002-07-10 21:38 ` Andrew Morton
2002-07-10 21:42 ` Benjamin LaHaise
2002-07-11 2:14 ` CaT
2002-07-11 17:01 ` Martin Dalecki
2002-07-10 22:01 ` Thunder from the hill
2002-07-10 22:09 ` Cort Dougan
2002-07-11 13:36 ` Whoa... (was: Re: HZ, preferably as small as possible) Mark Mielke
2002-07-11 21:08 ` Daniel Phillips
2002-07-10 22:41 ` HZ, preferably as small as possible Thunder from the hill
2002-07-10 22:47 ` Thunder from the hill
2002-07-10 22:49 ` Eli Carter
2002-07-10 23:05 ` Thunder from the hill
2002-07-10 23:08 ` Dave Mielke
2002-07-10 23:13 ` Thunder from the hill
2002-07-10 23:50 ` J.A. Magallon
2002-07-11 0:28 ` Lincoln Dale
2002-07-11 11:35 ` Kasper Dupont
2002-07-11 12:30 ` Alan Cox
2002-07-11 13:37 ` Kasper Dupont
2002-07-11 15:46 ` Alan Cox
2002-07-11 18:51 ` george anzinger
2002-07-15 5:06 ` Linus Torvalds
2002-07-15 16:26 ` Robert Love
2002-07-15 18:56 ` Linus Torvalds
2002-07-15 19:52 ` mbs
2002-07-15 20:01 ` yodaiken
2002-07-16 11:41 ` Vojtech Pavlik
2002-07-17 19:33 ` Daniel Phillips
2002-07-17 20:31 ` Richard B. Johnson
2002-07-17 20:40 ` Daniel Phillips
2002-07-17 21:02 ` Richard B. Johnson
2002-07-17 21:02 ` Linus Torvalds
2002-07-17 21:16 ` Daniel Phillips
2002-07-18 12:57 ` Richard B. Johnson
2002-07-18 13:25 ` Daniel Phillips
2002-07-18 10:10 ` Kai Henningsen
2002-07-17 20:55 ` Linus Torvalds
2002-07-11 2:46 Grover, Andrew
2002-07-11 3:01 ` Jeff Garzik
2002-07-11 11:45 ` Alan Cox
2002-07-11 17:08 ` Martin Dalecki
2002-07-11 19:21 ` Albert D. Cahalan
2002-07-16 9:17 ` Kai Henningsen
2002-07-11 20:34 ` Bill Davidsen
2002-07-12 12:01 ` Martin Dalecki
2002-07-15 5:15 ` Linus Torvalds
2002-07-15 6:56 ` Albert D. Cahalan
2002-07-15 8:24 ` Russell King
2002-07-15 15:48 ` David Mosberger
2002-07-15 18:20 ` Albert D. Cahalan
2002-07-15 18:30 ` David Mosberger
2002-07-15 16:07 ` Albert D. Cahalan
2002-07-15 17:06 ` Russell King
2002-07-15 18:43 ` Albert D. Cahalan
2002-07-15 18:53 ` Russell King
2002-07-15 18:50 ` Linus Torvalds
2002-07-15 20:15 ` Albert D. Cahalan
2002-07-15 8:58 ` Dave Mielke
2002-07-11 7:09 ` george anzinger
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