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From: Simon Kirby <sim@netnation.com>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Andries.Brouwer@cwi.nl, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] kill(-1,sig)
Date: Fri, 14 Dec 2001 12:49:25 -0800	[thread overview]
Message-ID: <20011214124925.A18819@netnation.com> (raw)
In-Reply-To: <20011214123628.A22506@netnation.com> <Pine.LNX.4.33.0112141237470.3063-100000@penguin.transmeta.com>
In-Reply-To: <Pine.LNX.4.33.0112141237470.3063-100000@penguin.transmeta.com>; from torvalds@transmeta.com on Fri, Dec 14, 2001 at 12:40:16PM -0800

On Fri, Dec 14, 2001 at 12:40:16PM -0800, Linus Torvalds wrote:

> I do agree, I've used "kill -9 -1" myself.
> 
> However, let's see how problematic it is to try to follow it (in 2.5.x,
> not 2.4.x) and if people really complain.

Doesn't init use kill -15 -1, kill -9 -1, etc., to terminate all
processes?  Hmm.  Yes, it does, but the kernel checks for (pid > 1).

By removing the single compare in the kernel, we're potentially
increasing the size of userspace applications from a single syscall to a
whole walking of /proc just to kill other running processes.  Ugh.

"kill -STOP -1" is also great for freezing forkbombs which would no
longer possible with the /proc method.

Simon-

[  Stormix Technologies Inc.  ][  NetNation Communications Inc. ]
[       sim@stormix.com       ][       sim@netnation.com        ]
[ Opinions expressed are not necessarily those of my employers. ]

  reply	other threads:[~2001-12-14 20:49 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-12-14 17:34 [PATCH] kill(-1,sig) Andries.Brouwer
2001-12-14 20:25 ` Linus Torvalds
2001-12-17  9:34   ` Chris Wright
2001-12-17 14:41     ` vda
2001-12-17 11:53       ` Sean Hunter
2001-12-17 12:06         ` Matthew Kirkwood
2001-12-17 12:30           ` Sean Hunter
2001-12-17 12:16         ` Miquel van Smoorenburg
2001-12-17 16:06         ` vda
2001-12-14 20:36 ` Simon Kirby
2001-12-14 20:40   ` Linus Torvalds
2001-12-14 20:49     ` Simon Kirby [this message]
2001-12-15 10:19     ` Albert D. Cahalan
2001-12-15 14:03       ` Martin Josefsson
2001-12-15 23:09       ` Simon Kirby
2001-12-16  8:26         ` Albert D. Cahalan
2001-12-17  8:50     ` Helge Hafting
2001-12-17 20:51     ` Udo A. Steinberg
2001-12-17 21:13       ` Linus Torvalds
2001-12-17 22:06         ` Richard B. Johnson
2001-12-18 17:27   ` Alan Cox
2001-12-14 21:22 Andries.Brouwer
2001-12-17  7:01 Richard Gooch
2001-12-17 11:41 ` vda
2001-12-17 16:41 ` Richard Gooch
2001-12-17 23:38 Andries.Brouwer

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