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Re: [Xen-devel] Re: [PATCH 1/4] CPU online/offline support in Xen

from [Keir Fraser] [Permanent Link][Original]
To: "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>, Christoph Egger <Christoph.Egger@xxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH 1/4] CPU online/offline support in Xen
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Thu, 18 Sep 2008 08:20:48 +0100
Cc: "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Shan, Haitao" <haitao.shan@xxxxxxxxx>, Gavin Maltby <Gavin.Maltby@xxxxxxx>, Haitao Shan <maillists.shan@xxxxxxxxx>
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Thread-topic: [Xen-devel] Re: [PATCH 1/4] CPU online/offline support in Xen
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On 18/9/08 04:56, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:

>> It has since c/s 17968.
> 
> Hmm, I think current NMI_MCE_SOFTIRQ can't make sure other guest will not be
> scheduled. Considering there is a schedule softirq already pending on the
> pCPU, other guest may run before the impacted guest. Did I missed anything?

There are races here in any case. What if #MC happens halfway through the
scheduler, just before set_current(new)?

 -- Keir



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