From: Pavel Machek <pavel@suse.cz>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Kai Henningsen <kaih@khms.westfalen.de>, linux-kernel@vger.kernel.org
Subject: vsyscalls [was Re: X15 alpha release: as fast as TUX but in user space (fwd)]
Date: Mon, 7 May 2001 19:03:22 +0000 [thread overview]
Message-ID: <20010507190320.A45@(none)> (raw)
In-Reply-To: <80BTbB7Hw-B@khms.westfalen.de> <E14vFXu-0005FC-00@the-village.bc.nu>
In-Reply-To: <E14vFXu-0005FC-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Thu, May 03, 2001 at 10:37:12AM +0100
Hi!
> > > PS: Hmm, how do you do timewarp for just one userland appliation with
> > > this installed?
> >
> > 1. What on earth for?
>
> Y2K testing was one previous example.
>
> > 2. How do you do it today, and why wouldn't that work?
>
> LD_PRELOAD and providing its still using a lib call it would. I dont see the
> original posters problem
LD_PRELOAD is not reliable: application may do syscall itself and find
out true time. But ptrace works currently and *is* reliable.
Problem is that vsyscalls ay take ability to use ptrace to fool apps away.
Pavel
--
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
next prev parent reply other threads:[~2001-05-11 7:05 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 ` Pavel Machek [this message]
2001-05-03 12:23 ` Helge Hafting
2001-05-03 19:09 ` 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
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