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Message-Id: <1204556014.3842.13.camel@yangyi-dev.bj.intel.com>
Date: Mon, 03 Mar 2008 22:53:34 +0800
From: Yi Yang <yi.y.yang@...el.com>
To: Dmitry Adamushko <dmitry.adamushko@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org,
linux-kernel@...r.kernel.org
Subject: Re: [BUG 2.6.25-rc3] scheduler/hotplug: some processes are
dealocked when cpu is set to offline
On Mon, 2008-03-03 at 13:02 +0100, Dmitry Adamushko wrote:
> On 03/03/2008, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Dmitry Adamushko <dmitry.adamushko@...il.com> wrote:
> >
> > > per_cpu(watchdog_task, hotcpu) = NULL;
> > > + mlseep(1);
> >
> >
> > that wont build very well ...
>
> yeah, I forgot to mention that it's not even compile-tested :-/
> I re-created it from scratch instead of looking for the original one.
>
> please, this one (again, not compile-tested)
>
> --- softlockup-prev-2.c 2008-03-03 12:38:36.000000000 +0100
> +++ softlockup.c 2008-03-03 13:00:20.000000000 +0100
> @@ -294,6 +294,7 @@ cpu_callback(struct notifier_block *nfb,
> case CPU_DEAD_FROZEN:
> p = per_cpu(watchdog_task, hotcpu);
> per_cpu(watchdog_task, hotcpu) = NULL;
> + msleep(1);
> kthread_stop(p);
> break;
> #endif /* CONFIG_HOTPLUG_CPU */
I don't think it can fix this issue, it only gives one chance to
scheduler, i think there are another potential and very serious issues
inside of scheduler or locking or what else we don't know.
Maybe migration is a doubtful point as Gautham mentioned.
>
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