From: "Matthias Urlichs" <smurf@smurf.noris.de>
To: Chris Wedgwood <cw@f00f.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [parisc-linux] Re: [PATCH] Fix the cpumask rewrite
Date: Mon, 28 Jun 2004 03:24:07 +0200 [thread overview]
Message-ID: <20040628012407.GC4648@kiste> (raw)
In-Reply-To: <20040627224115.GA22532@taniwha.stupidest.org>
Hi,
Chris Wedgwood:
> On Sun, Jun 27, 2004 at 02:00:03PM +0200, Matthias Urlichs wrote:
>
> > <heretic>
> > #define jiffies __get_jiffies()
> > </heretic>
>
> Well, I have that but it's only part of the story.
>
True.
> As Alan pointed out a suitable API could also make it easier to work
> towards a clock-less system for embedded targets.
>
Well, drivers do need some way of timing things, else they wouldn't read
jiffies in the first place. So, at minimum, an embedded system would
need a way to trigger a timeout at some specified time in the future.
A simple __get_jiffies() implementation could just set up a 1/HZ-second
timer (and busy-wait for it, and increase its internal jiffies counter)
every tenth call or so. That would probably slow down the whole system
somewhat, but I'd assume it'd mostly work.
--
Matthias Urlichs
next prev parent reply other threads:[~2004-06-28 1:28 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-26 16:08 James Bottomley
2004-06-26 16:32 ` Linus Torvalds
2004-06-26 16:44 ` Linus Torvalds
2004-06-26 16:46 ` James Bottomley
2004-06-26 16:54 ` Linus Torvalds
2004-06-26 17:18 ` James Bottomley
2004-06-26 18:01 ` Linus Torvalds
2004-06-26 18:28 ` Vojtech Pavlik
2004-06-26 18:54 ` Linus Torvalds
2004-06-26 19:02 ` James Bottomley
2004-06-26 19:13 ` Linus Torvalds
2004-06-26 19:13 ` Vojtech Pavlik
2004-06-26 18:59 ` James Bottomley
2004-06-26 19:11 ` Linus Torvalds
2004-06-26 19:33 ` James Bottomley
2004-06-28 23:16 ` Jonathan Lundell
2004-07-01 13:11 ` Pavel Machek
2004-07-01 14:07 ` [parisc-linux] " Alan Cox
2004-07-01 16:15 ` Linus Torvalds
2004-07-01 16:52 ` Jeff Garzik
2004-07-01 17:42 ` Linus Torvalds
2004-06-26 22:18 ` Chris Wedgwood
2004-06-26 22:48 ` Linus Torvalds
2004-06-26 22:54 ` [parisc-linux] " Alan Cox
2004-06-27 0:05 ` Chris Wedgwood
2004-06-27 12:00 ` Matthias Urlichs
2004-06-27 22:41 ` Chris Wedgwood
2004-06-28 1:24 ` Matthias Urlichs [this message]
2004-06-28 5:42 ` Chris Wedgwood
2004-06-28 6:55 ` Matthias Urlichs
2004-06-28 7:02 ` Chris Wedgwood
2004-06-28 7:19 ` Matthias Urlichs
2004-06-27 14:37 ` Alan Cox
2004-07-01 13:33 ` Pavel Machek
2004-07-01 17:43 ` Chris Wedgwood
2004-06-26 23:37 ` jiffies_64 Chris Wedgwood
2004-06-27 1:55 ` more (insane) jiffies ranting Chris Wedgwood
2004-06-27 17:39 ` Linus Torvalds
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