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

To: Christoph Egger <Christoph.Egger@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 0/4] CPU online/offline support in Xen
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 09 Sep 2008 11:20:18 +0100
Cc: Gavin Maltby <Gavin.Maltby@xxxxxxx>, "Shan, Haitao" <haitao.shan@xxxxxxxxx>
Delivery-date: Tue, 09 Sep 2008 03:20:28 -0700
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Thread-topic: [Xen-devel] [PATCH 0/4] CPU online/offline support in Xen
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You can hardly expect to do work in private and then 'surface the submarine'
when others post patches and expect them to do the work to merge with you.
If Intel's patches look acceptable then they will be checked in and Sun will
have to do the merge work to get any extra enhancements or features in their
patchset to work on top. That is unless you can see strong reason why Sun's
patches are technically better.

 -- Keir

On 9/9/08 10:06, "Christoph Egger" <Christoph.Egger@xxxxxxx> wrote:

> 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.
> Christoph
> 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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