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From: Andi Kleen <ak@suse.de>
To: "David S. Miller" <davem@redhat.com>
Cc: root@chaos.analogic.com,
	Torrey Hoffman <torrey.hoffman@myrio.com>,
	"'Kenneth Johansson'" <ken@canit.se>,
	Jonathan Lundell <jlundell@pobox.com>,
	linux-kernel@vger.kernel.org
Subject: Re: 2.4 and 2GB swap partition limit
Date: Wed, 2 May 2001 16:31:01 +0200	[thread overview]
Message-ID: <20010502163101.A7174@gruyere.muc.suse.de> (raw)
In-Reply-To: <B65FF72654C9F944A02CF9CC22034CE22E1B9F@mail0.myrio.com> <Pine.LNX.3.95.1010430145555.15714A-100000@chaos.analogic.com> <15085.47104.75880.572242@pizda.ninka.net>
In-Reply-To: <15085.47104.75880.572242@pizda.ninka.net>; from davem@redhat.com on Mon, Apr 30, 2001 at 12:07:44PM -0700

On Mon, Apr 30, 2001 at 12:07:44PM -0700, David S. Miller wrote:
> Even more effective is:
> 
> mv /wherever/exeimage /usr/bin/exeimage
> 
> The kernel keeps around the contents of the old file while
> the executing process still runs.
> 
> This is also basically how things like libc get installed.
> A single mv is not only preserves currently referenced contents,
> it is atomic.

But something must have been not working with it for mmaps/shlibs 
(not executables); at least historically.
At least I remember that all hell broke lose when you tried to update
libc by cp'ing a new one to /lib/libc.so in the 1.2 days. cp should create a 
new inode (it uses O_CREAT) so in theory it should be coherent by the inode 
reference; but somehow it didn't use to work and random already running 
programs started to segfault. This was long ago. I wonder if old
GNU cp used O_TRUNC instead of O_CREAT, or was there some other kernel bug 
with mappings (hopefully long since fixed). Anybody remembers? 

-Andi

  parent reply	other threads:[~2001-05-02 14:32 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-04-30 18:45 2.4 and 2GB swap partition limit Torrey Hoffman
2001-04-30 19:04 ` Richard B. Johnson
2001-04-30 19:07 ` David S. Miller
2001-04-30 19:14   ` Richard B. Johnson
2001-04-30 21:04     ` Andreas Ferber
2001-05-02 14:31   ` Andi Kleen [this message]
2001-05-02 22:17     ` Andreas Dilger
2001-05-04  8:16       ` Andi Kleen
  -- strict thread matches above, loose matches on Subject: below --
2001-05-03 14:04 Ishikawa
2001-03-05 16:53 Andries.Brouwer
2001-03-04 22:04 Matt_Domsch
2001-03-05  8:58 ` Christoph Rohland
2001-03-05 14:30   ` Rik van Riel
2001-03-05 14:36   ` Rik van Riel
2001-03-05 14:52   ` Matti Aarnio
2001-03-05 13:30 ` Christoph Hellwig
2001-03-02 21:23 Matt_Domsch
2001-03-02 23:52 ` Kenneth Johansson
2001-03-03  6:14 ` William T Wilson
2001-03-03 11:14   ` Rogier Wolff
2001-03-08 13:05     ` Goswin Brederlow
2001-04-27 10:51     ` Xavier Bestel
2001-04-27 11:13       ` Rogier Wolff
2001-04-27 20:52         ` LA Walsh
2001-04-27 21:44           ` Rik van Riel
2001-04-27 22:06             ` Thomas Dodd
2001-04-27 22:40             ` Hugh Dickins
2001-04-27 22:40               ` Rik van Riel
2001-04-29 15:12               ` Ingo Oeser
2001-04-27 22:44             ` LA Walsh
2001-04-28  7:47           ` Rogier Wolff
2001-04-27 22:22         ` Wakko Warner
2001-04-28 13:17           ` Rogier Wolff
2001-04-28 13:37             ` Wakko Warner
2001-04-28 14:11               ` Rogier Wolff
2001-04-28 14:28                 ` J . A . Magallon
2001-04-30 18:12                   ` Alan Cox
2001-05-01 13:00                     ` Stephen C. Tweedie
2001-05-01 16:14                       ` Rogier Wolff
2001-05-01 16:35                         ` Stephen C. Tweedie
2001-05-02 10:54                           ` Rogier Wolff
2001-05-02 11:04                             ` Stephen C. Tweedie
2001-05-02 12:49                               ` Hugh Dickins
2001-05-02 13:43                                 ` Stephen C. Tweedie
2001-05-02  0:28                       ` Rik van Riel
2001-05-02  0:34                       ` David S. Miller
2001-05-02  0:43                         ` Rik van Riel
2001-05-02  1:14                           ` Roger Larsson
2001-05-02  1:30                             ` Rik van Riel
2001-05-01 13:39                     ` Christoph Rohland
2001-05-01 23:25                       ` Rik van Riel
2001-04-28 18:04                 ` Albert D. Cahalan
2001-04-28 21:23                   ` Rogier Wolff
2001-04-29  1:43                   ` Jonathan Lundell
2001-04-29  9:17                     ` Kenneth Johansson
2001-04-28 18:21                 ` David Lang
2001-04-28 21:25                   ` Rogier Wolff
2001-04-30 18:14             ` Alan Cox

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