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Re: [Xen-devel] [PATCH] Fix softlockup issue after vcpu hotplug

  • To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Tue, 30 Jan 2007 14:22:55 +0000
  • Delivery-date: Tue, 30 Jan 2007 06:22:40 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-topic: [Xen-devel] [PATCH] Fix softlockup issue after vcpu hotplug

On 30/1/07 2:11 pm, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:

> BTW, do you think whether it's worthy to destroy vcpu from
> scheduler when it's down and then re-init that vcpu into scheduler
> when it's on? I don't know whether this will make any influence to
> accounting of scheduler. Actually domain save/restore doesn't show
> this bug, and one obvious distinct compared to vcpu-hotplug is that
> domain is restored in a new context...

I wouldn't expect this to make any significant difference to scheduling
accounting, certainly over a multi-second time period.

Does the time you hoy-unplug the vcpu for make a difference to how often you
see this problem? Did you try repro'ing with a 2.6.16 kernel?

 -- Keir

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