From: Doug McNaught <doug@mcnaught.org>
To: Russell Miller <rmiller@duskglow.com>
Cc: Kurt Wall <kwall@kurtwerks.com>, linux-kernel@vger.kernel.org
Subject: Re: is killing zombies possible w/o a reboot?
Date: Wed, 03 Nov 2004 20:56:28 -0500 [thread overview]
Message-ID: <87zn1y2x83.fsf@asmodeus.mcnaught.org> (raw)
In-Reply-To: <200411031945.20894.rmiller@duskglow.com> (Russell Miller's message of "Wed, 3 Nov 2004 20:45:20 -0500")
Russell Miller <rmiller@duskglow.com> writes:
> Wouldn't it help with device driver problems? Couldn't ring 1 be
> used to make sure an errant driver doesn't drop the kernel, at least
> on x86 machines?
As I understand it:
1) Ring transitions aren't free.
2) The API between drivers and kernel is always in flux; drivers
expect to be able to access internal kernel data structures.
Making drivers run in ring 1 on even one of the N architectures
would be a major refactoring and would constrain API changes.
Freezing the internal API is something the developers don't want to
do.
3) There are probably plenty of ways for a buggy driver to crash the
kernel even if it's running in ring 1 (turn off interrupts and
leave them off, etc).
So the upshot is that it's probably not worth the work and portability
hassles.
-Doug
next prev parent reply other threads:[~2004-11-04 2:14 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-03 12:51 is killing zombies possible w/o a reboot? Gene Heskett
2004-11-03 14:33 ` bert hubert
2004-11-03 14:49 ` Måns Rullgård
2004-11-03 15:25 ` DervishD
2004-11-03 15:25 ` Måns Rullgård
2004-11-03 17:49 ` DervishD
2004-11-03 16:47 ` Gene Heskett
2004-11-03 17:44 ` DervishD
2004-11-03 18:53 ` Gene Heskett
2004-11-03 19:01 ` Doug McNaught
2004-11-03 19:03 ` Måns Rullgård
2004-11-03 19:24 ` Gene Heskett
2004-11-03 19:33 ` Doug McNaught
2004-11-03 19:34 ` Måns Rullgård
2004-11-03 19:06 ` Valdis.Kletnieks
2004-11-03 19:26 ` Gene Heskett
2004-11-03 19:33 ` Valdis.Kletnieks
2004-11-03 20:09 ` Gene Heskett
2004-11-04 19:24 ` Bill Davidsen
2004-11-03 19:42 ` DervishD
2004-11-03 23:12 ` Bill Davidsen
2004-11-04 10:26 ` DervishD
2004-11-04 14:23 ` Paul Slootman
2004-11-04 14:56 ` Gene Heskett
2004-11-04 18:24 ` DervishD
2004-11-04 19:22 ` Bill Davidsen
2004-11-04 20:53 ` DervishD
2004-11-03 19:26 ` DervishD
2004-11-03 20:18 ` Gene Heskett
2004-11-03 22:15 ` Jim Nelson
2004-11-03 22:44 ` Russell Miller
2004-11-03 23:03 ` Doug McNaught
2004-11-03 23:33 ` Russell Miller
2004-11-03 23:47 ` Mathieu Segaud
2004-11-03 23:56 ` Russell Miller
2004-11-04 0:05 ` Mathieu Segaud
2004-11-04 6:39 ` Denis Vlasenko
2004-11-05 2:38 ` Elladan
2004-11-05 3:10 ` Tim Connors
2004-11-05 3:17 ` Russell Miller
2004-11-05 4:38 ` Elladan
2004-11-05 5:00 ` Kyle Moffett
2004-11-04 20:06 ` Bill Davidsen
2004-11-03 23:06 ` vlobanov
2004-11-04 10:04 ` Helge Hafting
2004-11-04 17:16 ` Alex Bennee
2004-11-04 16:30 ` Pedro Venda (SYSADM)
2004-11-04 22:28 ` Helge Hafting
2004-11-03 23:07 ` Bill Davidsen
2004-11-04 1:19 ` Michael Clark
2004-11-04 16:01 ` kernel
2004-11-04 16:18 ` Gene Heskett
2004-11-04 16:47 ` kernel
2004-11-04 17:58 ` Gene Heskett
2004-11-03 22:58 ` Bill Davidsen
2004-11-04 10:23 ` DervishD
2004-11-04 19:32 ` Bill Davidsen
2004-11-04 21:11 ` DervishD
2004-11-09 23:31 ` Bill Davidsen
2004-11-10 9:11 ` DervishD
2004-11-03 23:18 ` Adam Heath
2004-11-03 16:38 ` Gene Heskett
2004-11-03 16:24 ` Gene Heskett
2004-11-03 16:46 ` linux-os
2004-11-03 19:12 ` Gene Heskett
2004-11-03 19:56 ` Måns Rullgård
2004-11-03 20:13 ` Helge Hafting
2004-11-03 20:40 ` Gene Heskett
2004-11-04 0:43 ` Kurt Wall
2004-11-04 1:01 ` Russell Miller
2004-11-04 1:38 ` Doug McNaught
2004-11-04 1:45 ` Russell Miller
2004-11-04 1:56 ` Doug McNaught [this message]
2004-11-04 1:59 ` Mitchell Blank Jr
2004-11-04 20:10 ` Bill Davidsen
2004-11-04 10:07 ` Matthias Andree
2004-11-04 22:31 ` Peter Chubb
2004-11-04 23:33 ` Benno
2004-11-03 20:48 ` Tom Felker
2004-11-03 21:08 ` Gene Heskett
2004-11-04 7:19 ` Jan Knutar
2004-11-04 11:57 ` Gene Heskett
2004-11-04 12:12 ` Jan Knutar
2004-11-04 12:18 ` Gene Heskett
2004-11-04 12:29 ` Jan Knutar
2004-11-04 13:56 ` Gene Heskett
2004-11-04 12:39 ` Gene Heskett
2004-11-04 13:01 ` Ian Campbell
2004-11-04 14:07 ` Gene Heskett
2004-11-04 14:24 ` Ian Campbell
2004-11-04 15:10 ` Gene Heskett
2004-11-04 14:26 ` DervishD
2004-11-04 15:13 ` Gene Heskett
2004-11-04 13:10 ` Doug McNaught
2004-11-04 14:11 ` Gene Heskett
2004-11-04 14:42 ` tlaurent
2004-11-04 15:14 ` Gene Heskett
2004-11-04 20:18 ` Bill Davidsen
2004-11-05 0:29 ` Gene Heskett
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=87zn1y2x83.fsf@asmodeus.mcnaught.org \
--to=doug@mcnaught.org \
--cc=kwall@kurtwerks.com \
--cc=linux-kernel@vger.kernel.org \
--cc=rmiller@duskglow.com \
/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.