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Re: [Xen-devel] [PATCH 0/4] CPU online/offline support in Xen

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Subject: Re: [Xen-devel] [PATCH 0/4] CPU online/offline support in Xen
From: Christoph Egger <Christoph.Egger@xxxxxxx>
Date: Tue, 9 Sep 2008 11:06:41 +0200
Cc: Gavin Maltby <Gavin.Maltby@xxxxxxx>, "Shan, Haitao" <haitao.shan@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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SUN also has code for physical cpu hotplugging.
So this is duplicate work now.
Please get into contact with each other and merge your patches.


On Tuesday 09 September 2008 10:58:41 Shan, Haitao wrote:
> Hi, Keir,
> The following patches enable Xen to online/offline a physical CPU. This
> feature will be needed by possibly CPU hot-plug and RAS features.
> Some code of cpu online/offline is already in Xen, ever since S3 feature
> was added to Xen. This patch series only adds the missing part.
> Note: We only add the code to implement the function that actually
> online/offline a CPU. The patches for tests are only served as a test
> purpose. We do the tests by hooking online/offline decision to vcpu
> online/offline path in Dom0. Thus, writes to
> /sys/devices/system/cpu/cpuX/online will online/offline the vcpu, as
> well as physical cpu.
> Here is the description of the patches.
> cpu_offline.patch     Implements cpu offline feature
> cpu_online.patch      Implements cpu online feature
> cpu_online_offline_test.patch Used for tests -- Xen part
> cpu_online_offline_kernel.patch       Used for tests -- Dom0 kernel part
> Best Regards
> Haitao Shan

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