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Message-ID: <20101122155151.GD4137@hack>
Date:	Mon, 22 Nov 2010 23:51:52 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Shaohui Zheng <shaohui.zheng@...el.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	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, Ingo Molnar <mingo@...e.hu>,
	Len Brown <len.brown@...el.com>,
	Yinghai Lu <Yinghai.Lu@....COM>,
	Haicheng Li <haicheng.li@...el.com>
Subject: Re: [5/8,v3] NUMA Hotplug Emulator: support cpu probe/release in
	x86

On Mon, Nov 22, 2010 at 08:01:04AM +0800, Shaohui Zheng wrote:
>On Sun, Nov 21, 2010 at 10:45:11PM +0800, Américo Wang wrote:
>> On Wed, Nov 17, 2010 at 10:08:04AM +0800, shaohui.zheng@...el.com wrote:
>> >From: Shaohui Zheng <shaohui.zheng@...el.com>
>> >
>> >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.
>> >
>> 
>> Huh? We already have CPU online/offline...
>> 
>> Can you describe more about the difference?
>> 
>> Thanks.
>
>Again, we already try to discribe the difference between logcial cpu
>online/offline and physical cpu online/offline many times.
>

I see, with "maxcpus=" we will only have the specified number
of CPU's which can be online/offline, you are trying to bring
the rest of CPU's hidden by "maxcpus=". :) Correct?

I think the idea is cool, but I think you need to improve
the documetion, for people who don't follow the hardware
concepts like me. ;)

Thanks.

-- 
Live like a child, think like the god.
 
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