From: Helge Hafting <helgehaf@idb.hist.no>
To: Pavel Machek <pavel@suse.cz>, linux-kernel@vger.kernel.org
Subject: Re: X15 alpha release: as fast as TUX but in user space (fwd)
Date: Thu, 03 May 2001 14:23:33 +0200 [thread overview]
Message-ID: <3AF14DC5.17E35108@idb.hist.no> (raw)
In-Reply-To: <Pine.LNX.4.33.0104281752290.10866-100000@localhost.localdomain> <20010428215301.A1052@gruyere.muc.suse.de> <200104282256.f3SMuRW15999@vindaloo.ras.ucalgary.ca> <9cg7t7$gbt$1@cesium.transmeta.com> <20010430104231.C3294@bug.ucw.cz>
Pavel Machek wrote:
> > >
> > > Whatever happened to that hack that was discussed a year or two ago?
> > > The one where (also on IA32) a magic page was set up by the kernel
> > > containing code for fast system calls, and the kernel would write
> > > calibation information to that magic page. The code written there
> > > would use the TSC in conjunction with that calibration data.
> Pavel
> PS: Hmm, how do you do timewarp for just one userland appliation with
> this installed?
1. Kernel solution: give that particular process a different magic page
2. User solution: Don't obtain time from the magic page.
2a By changing program source, if available
2b By switching the c library, assuming it is used
Helge Hafting
next prev parent reply other threads:[~2001-05-03 12:24 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-28 15:52 X15 alpha release: as fast as TUX but in user space (fwd) Ingo Molnar
2001-04-28 19:53 ` Andi Kleen
2001-04-28 22:56 ` Richard Gooch
2001-04-29 5:13 ` H. Peter Anvin
2001-04-29 11:14 ` Jeff Garzik
2001-04-29 11:27 ` David S. Miller
2001-04-29 13:32 ` Ingo Oeser
2001-04-29 18:48 ` Richard Gooch
2001-04-29 18:55 ` Gregory Maxwell
2001-04-29 19:02 ` Richard Gooch
2001-04-29 19:47 ` Gregory Maxwell
2001-04-29 19:54 ` Richard Gooch
2001-04-29 20:11 ` Ingo Oeser
2001-04-29 20:18 ` Gregory Maxwell
2001-04-29 22:20 ` Richard Gooch
2001-04-30 0:13 ` Andrea Arcangeli
2001-04-29 20:45 ` Arjan van de Ven
2001-04-29 22:18 ` Richard Gooch
2001-04-30 16:46 ` Alan Cox
2001-04-29 19:38 ` Jamie Lokier
2001-04-29 23:53 ` Andrea Arcangeli
2001-04-29 16:21 ` dean gaudet
2001-04-29 20:19 ` H. Peter Anvin
2001-04-29 22:29 ` Richard Gooch
2001-04-29 21:16 ` Jim Gettys
2001-04-29 21:40 ` H. Peter Anvin
2001-04-29 21:47 ` Jim Gettys
2001-05-02 18:18 ` Matti Aarnio
2001-05-02 19:34 ` Linus Torvalds
2001-05-02 20:55 ` Fabio Riccardi
2001-04-30 7:02 ` David S. Miller
2001-04-30 7:29 ` H. Peter Anvin
2001-04-30 7:51 ` David S. Miller
2001-04-30 14:56 ` Jonathan Lundell
2001-04-30 8:42 ` Pavel Machek
2001-05-03 7:13 ` Kai Henningsen
2001-05-03 7:44 ` Keith Owens
2001-05-03 10:37 ` Ingo Oeser
2001-05-03 15:44 ` Gregory Maxwell
2001-05-07 19:04 ` Pavel Machek
2001-05-03 9:37 ` Alan Cox
2001-05-07 19:03 ` vsyscalls [was Re: X15 alpha release: as fast as TUX but in user space (fwd)] Pavel Machek
2001-05-03 12:23 ` Helge Hafting [this message]
2001-05-03 19:09 ` X15 alpha release: as fast as TUX but in user space (fwd) Pavel Machek
2001-05-03 19:50 ` agrawal
2001-05-07 19:07 ` vsyscallRe: " Pavel Machek
2001-05-03 20:19 ` Alan Cox
2001-05-03 20:41 ` Gregory Maxwell
2001-05-04 8:06 ` Pavel Machek
2001-05-04 17:31 ` dean gaudet
2001-05-04 8:43 ` bert hubert
2001-05-02 10:52 ` Andi Kleen
2001-05-02 10:53 ` Ingo Molnar
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=3AF14DC5.17E35108@idb.hist.no \
--to=helgehaf@idb.hist.no \
--cc=linux-kernel@vger.kernel.org \
--cc=pavel@suse.cz \
/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.