From: Pavel Machek <pavel@suse.cz>
To: Robert Love <rml@tech9.net>
Cc: dipankar@in.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: 2.5.8: preemption + SMP broken ?
Date: Sun, 21 Apr 2002 18:57:05 +0000 [thread overview]
Message-ID: <20020421185705.B155@toy.ucw.cz> (raw)
In-Reply-To: <20020417232253.A629@in.ibm.com> <1019067957.1669.46.camel@phantasy>
Hi!
> > My machine (4cpu x86) hangs while booting a kernel with SMP
> > and preemption enabled. It hangs while executing one of
> > the initcalls, probably BIO since that is where the
> > next boot message comes from during a successful boot with SMP
> > (or preemption) disabled.
> >
> > Has anyone tried out preemption with SMP ?
>
> Sure, all my testing is on SMP. The problem manifested itself in
> 2.5.8-pre when some changes where made to the migration code. The race
> is in the migration code - I am not sure it is preempts fault, per se,
> but the attached patch should fix it. It is pending with Linus for the
> next release.
Wel, if race is in migration code, you should fix migration, not add
preempt_disable(), right? [Or is race preempt-onlly?]
--
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
next prev parent reply other threads:[~2002-04-22 16:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-17 17:52 Dipankar Sarma
2002-04-17 18:25 ` Robert Love
2002-04-17 19:04 ` Dipankar Sarma
2002-04-21 18:57 ` Pavel Machek [this message]
2002-04-22 18:16 ` Robert Love
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