From: Dave Jones <davej@redhat.com>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Jeff Garzik <jgarzik@pobox.com>,
Ricky Beam <jfbeam@bluetronic.net>,
Zilvinas Valinskas <zilvinas@gemtek.lt>,
Erik Tews <erik@debian.franken.de>,
linux-kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.9 rc2 freezing
Date: Wed, 15 Sep 2004 17:59:33 +0100 [thread overview]
Message-ID: <20040915165933.GD24892@redhat.com> (raw)
In-Reply-To: <1095264408.2406.148.camel@krustophenia.net>
On Wed, Sep 15, 2004 at 12:06:48PM -0400, Lee Revell wrote:
> Anyway, if you are running anything on your server that breaks under
> PREEMPT, it will break anyway as soon as you add another processor.
Wrong. Code can be SMP safe but not preempt safe.
This is why we have get_cpu()/put_cpu(), and
preempt_disable()/preempt_enable() pairs around certain parts of code.
Anything using per-CPU data like MSRs for example needs explicit
protection against preemption.
Dave
next prev parent reply other threads:[~2004-09-15 17:06 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-13 16:55 2.6.9 rc2 freezing Zilvinas Valinskas
2004-09-13 17:12 ` Jeff Garzik
2004-09-13 17:16 ` Zilvinas Valinskas
2004-09-15 8:25 ` Erik Tews
2004-09-15 9:58 ` Zilvinas Valinskas
2004-09-15 14:55 ` Ricky Beam
2004-09-15 15:48 ` Lee Revell
2004-09-15 15:58 ` Jeff Garzik
2004-09-15 16:06 ` Lee Revell
2004-09-15 16:11 ` Jeff Garzik
2004-09-15 16:58 ` Ricky Beam
2004-09-15 17:49 ` Lee Revell
2004-09-15 17:52 ` Jeff Garzik
2004-09-15 17:59 ` Lee Revell
2004-09-16 8:39 ` Helge Hafting
2004-09-17 8:05 ` Zilvinas Valinskas
2004-09-17 13:21 ` Zilvinas Valinskas
2004-09-15 16:59 ` Dave Jones [this message]
2004-09-13 17:19 ` Zilvinas Valinskas
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=20040915165933.GD24892@redhat.com \
--to=davej@redhat.com \
--cc=erik@debian.franken.de \
--cc=jfbeam@bluetronic.net \
--cc=jgarzik@pobox.com \
--cc=linux-kernel@vger.kernel.org \
--cc=rlrevell@joe-job.com \
--cc=zilvinas@gemtek.lt \
/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.