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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3D5B03A5.5050703@zytor.com \
--to=hpa@zytor.com \
--cc=R.E.Wolff@BitWizard.nl \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=linux-kernel@vger.kernel.org \
--cc=willy@w.ods.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.