From: Helge Hafting <helge.hafting@aitel.hist.no>
To: Ben Greear <greearb@candelatech.com>
Cc: Arjan van de Ven <arjan@infradead.org>,
linux-os@analogic.com, Adrian Bunk <bunk@stusta.de>,
Kyle Moffett <mrmacman_g4@mac.com>,
"Gilbert, John" <JGG@dolby.com>,
linux-kernel@vger.kernel.org
Subject: Re: Illegal use of reserved word in system.h
Date: Fri, 20 May 2005 11:27:13 +0200 [thread overview]
Message-ID: <428DAD71.4050105@aitel.hist.no> (raw)
In-Reply-To: <428CCD19.6030909@candelatech.com>
Ben Greear wrote:
> Arjan van de Ven wrote:
>
>> HZ may not exist. At all; people are trying to remove it. And userspace
>> has no business knowing about it either.
>
>
> It can be helpful to know what HZ you are running at, for instance if
> you care
> very much about the (average) precision of a select/poll timeout.
>
Will knowing it help? You may find out that you don't have much precision,
but then theres nothing to do about it. And there may not even be a HZ,
as mentioned. Less cpu is used if there is no periodic interrupts when
there is nothing to do. People are trying to *not* have a regular timer
interrupt; instead, a one-shot timer can be programmed for the next
necessary timeout which may very well be quite a few "ticks" into
the future. In this case there is no notion of HZ at all.
Helge Hafting
next prev parent reply other threads:[~2005-05-20 9:22 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-18 19:07 Illegal use of reserved word in system.h Gilbert, John
2005-05-18 19:53 ` Adrian Bunk
2005-05-19 2:22 ` Kyle Moffett
2005-05-19 11:28 ` Adrian Bunk
2005-05-19 12:19 ` Richard B. Johnson
2005-05-19 12:27 ` Arjan van de Ven
2005-05-19 12:47 ` Maciej W. Rozycki
2005-05-19 13:01 ` Richard B. Johnson
2005-05-19 13:47 ` Steven Rostedt
2005-05-19 14:06 ` Andreas Schwab
2005-05-19 14:15 ` Steven Rostedt
2005-05-19 14:36 ` Richard B. Johnson
2005-05-19 15:19 ` Andreas Schwab
2005-05-19 15:56 ` Steven Rostedt
2005-05-19 16:03 ` Richard B. Johnson
2005-05-19 15:58 ` Richard B. Johnson
2005-05-19 16:22 ` Steven Rostedt
2005-05-19 17:06 ` Richard B. Johnson
2005-05-19 17:36 ` Steven Rostedt
2005-05-19 14:43 ` Maciej W. Rozycki
2005-05-19 14:59 ` Steven Rostedt
2005-05-20 12:23 ` Maciej W. Rozycki
2005-05-19 14:53 ` Arjan van de Ven
2005-05-19 14:58 ` Maciej W. Rozycki
2005-05-19 15:06 ` Arjan van de Ven
2005-05-19 13:56 ` Steven Rostedt
2005-05-19 17:30 ` Ben Greear
2005-05-19 17:36 ` Chris Friesen
2005-05-19 17:40 ` Ben Greear
2005-05-19 22:14 ` Andreas Schwab
2005-05-19 22:30 ` J.A. Magallon
2005-05-19 22:41 ` Russell King
2005-05-19 23:10 ` J.A. Magallon
2005-05-20 0:01 ` Jeff Woods
2005-05-20 9:27 ` Helge Hafting [this message]
2005-05-20 16:47 ` Lee Revell
2005-05-20 16:56 ` Ben Greear
2005-05-18 23:42 ` Andi Kleen
2005-05-18 23:59 ` Adrian Bunk
-- strict thread matches above, loose matches on Subject: below --
2005-05-20 17:30 Gilbert, John
2005-05-19 20:18 Gilbert, John
2005-05-19 1:51 Gilbert, John
2005-05-18 21:31 Gilbert, John
2005-05-19 17:37 ` Alan Cox
2005-05-20 11:49 ` Dave Airlie
2005-05-20 16:42 ` Alan Cox
2005-05-18 18:23 Gilbert, John
2005-05-18 19:02 ` Adrian Bunk
2005-05-18 19:32 ` Richard B. Johnson
2005-05-19 1:06 ` rdunlap
2005-05-18 0:51 Gilbert, John
2005-05-18 0:57 ` Lee Revell
2005-05-18 1:19 ` Chris Wedgwood
2005-05-18 2:51 ` Steven Rostedt
2005-05-18 4:12 ` Willy Tarreau
2005-05-18 10:06 ` Patrick McFarland
2005-05-18 10:49 ` Coywolf Qi Hunt
2005-05-18 11:12 ` Richard B. Johnson
2005-05-18 21:52 ` Matan Peled
2005-05-19 11:03 ` Richard B. Johnson
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