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
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