linux-kernel - Re: [0/8,v3] NUMA Hotplug Emulator

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Date:	Wed, 17 Nov 2010 01:26:59 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	shaohui.zheng@...el.com
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, haicheng.li@...ux.intel.com,
	lethal@...ux-sh.org, ak@...ux.intel.com,
	shaohui.zheng@...ux.intel.com
Subject: Re: [0/8,v3] NUMA Hotplug Emulator - Introduction & Feedbacks

On Tue, Nov 16, 2010 at 6:07 PM,  <shaohui.zheng@...el.com> wrote:
>
> * WHAT IS HOTPLUG EMULATOR
>
> NUMA hotplug emulator is collectively named for the hotplug emulation
> it is able to emulate NUMA Node Hotplug thru a pure software way. It
> intends to help people easily debug and test node/cpu/memory hotplug
> related stuff on a none-numa-hotplug-support machine, even an UMA machine.
>
> The emulator provides mechanism to emulate the process of physcial cpu/mem
> hotadd, it provides possibility to debug CPU and memory hotplug on the machines
> without NUMA support for kenrel developers. It offers an interface for cpu
> and memory hotplug test purpose.
>
> * WHY DO WE USE HOTPLUG EMULATOR
>
> We are focusing on the hotplug emualation for a few months. The emualor helps
>  team to reproduce all the major hotplug bugs. It plays an important role to
> the hotplug code quality assuirance. Because of the hotplug emulator, we already
> move most of the debug working to virtual evironment.

You should extend kvm to make it support NUMA hotplug guest.
instead of messing up linux numa code.

Thanks

Yinghai
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