From: "H. Peter Anvin" <hpa@zytor.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Willy Tarreau <willy@w.ods.org>,
Rogier Wolff <R.E.Wolff@BitWizard.nl>,
linux-kernel@vger.kernel.org
Subject: Re: [patch 4/21] fix ARCH_HAS_PREFETCH
Date: Wed, 14 Aug 2002 18:28:05 -0700 [thread overview]
Message-ID: <3D5B03A5.5050703@zytor.com> (raw)
In-Reply-To: 1029374634.28240.26.camel@irongate.swansea.linux.org.uk
Alan Cox wrote:
> On Wed, 2002-08-14 at 21:58, H. Peter Anvin wrote:
>
>>Since some processors now have "busy wait delay" instructions, this
>>would also make it possible to do:
>
>
> Nobody should be using an empty busy loop. If its a short timed busy
> loop then they should be using udelay, if its a long one
> schedule_timeout()
>
Indeed.
> If its polling hardware then it isnt an empty loop
True indeed as well, although we should still have a busy_wait(); macro
that can insert whatever hint instruction the architecture might or
might not have.
-hpa
next prev parent reply other threads:[~2002-08-15 1:24 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-11 7:38 [patch 4/21] fix ARCH_HAS_PREFETCH Andrew Morton
2002-08-11 19:49 ` Alan Cox
2002-08-11 18:47 ` Andrew Morton
2002-08-11 18:46 ` Larry McVoy
2002-08-11 19:06 ` Linus Torvalds
2002-08-11 20:07 ` GCC still keeps empty loops? (was: [patch 4/21] fix ARCH_HAS_PREFETCH) Jamie Lokier
2002-08-12 7:45 ` Ralf Baechle
2002-08-13 21:42 ` [patch 4/21] fix ARCH_HAS_PREFETCH Adrian Bunk
2002-08-13 22:12 ` H. Peter Anvin
2002-08-13 22:22 ` Adrian Bunk
2002-08-13 22:42 ` H. Peter Anvin
2002-08-14 17:40 ` Rogier Wolff
2002-08-14 19:41 ` H. Peter Anvin
2002-08-14 19:57 ` Jamie Lokier
2002-08-14 22:03 ` Daniel Jacobowitz
2002-08-14 20:45 ` Willy Tarreau
2002-08-14 20:58 ` H. Peter Anvin
2002-08-14 21:11 ` Willy Tarreau
2002-08-14 21:13 ` H. Peter Anvin
2002-08-15 1:23 ` Alan Cox
2002-08-15 1:28 ` H. Peter Anvin [this message]
2002-08-15 1:37 ` Alan Cox
2002-08-14 22:53 ` David Lang
2002-08-14 23:31 ` Jamie Lokier
2002-08-15 6:44 ` Willy Tarreau
2002-08-15 6:55 ` H. Peter Anvin
[not found] <3D56147E.15E7A98@zip.com.au.suse.lists.linux.kernel>
2002-08-11 9:53 ` Andi Kleen
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