linux-kernel - Re: [RFC,5/7] NUMA hotplug emulator

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Date:	Fri, 14 May 2010 14:49:28 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, ak@...ux.intel.com,
	fengguang.wu@...el.com, haicheng.li@...ux.intel.com,
	shaohui.zheng@...ux.intel.com
Subject: Re: [RFC,5/7] NUMA hotplug emulator

On Thu, May 13, 2010 at 08:14:57PM +0800, Shaohui Zheng wrote:
> hotplug emulator: support cpu probe/release in x86
> 
> Add cpu interface probe/release under sysfs for x86. User can use this
> interface to emulate the cpu hot-add process, it is for cpu hotplug 
> test purpose. Add a kernel option CONFIG_ARCH_CPU_PROBE_RELEASE for this
> feature.
> 
> This interface provides a mechanism to emulate cpu hotplug with software
>  methods, it becomes possible to do cpu hotplug automation and stress
> testing.
> 
At a quick glance, is this really necessary? It seems like you could
easily replace most of this with a CPU notifier chain that takes care of
the node handling. See for example how ppc64 manages the CPU hotplug/numa
emulation case in arch/powerpc/mm/numa.c. arch_register_cpu() just looks
like some topology hack for ACPI, it would be nice not to perpetuate that
too much.
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