linux-kernel - Re: [7/7,v8] NUMA Hotplug Emulator: Implement per-node add

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Message-ID: <alpine.DEB.2.00.1012101529190.30039@chino.kir.corp.google.com>
Date:	Fri, 10 Dec 2010 15:30:38 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Shaohui Zheng <shaohui.zheng@...ux.intel.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, haicheng.li@...ux.intel.com,
	lethal@...ux-sh.org, Andi Kleen <ak@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [7/7,v8] NUMA Hotplug Emulator: Implement per-node add_memory
 debugfs interface

On Fri, 10 Dec 2010, Shaohui Zheng wrote:

> > That doesn't address the question.  My question is whether or not adding 
> > memory to a memoryless node in this way transitions its state to 
> > N_HIGH_MEMORY in the VM?
> I guess that you are talking about memory hotplug on x86_32, memory hotplug is
> NOT supported well for x86_32, and the function add_memory does not consider
> this situlation.
> 
> For 64bit, N_HIGH_MEMORY == N_NORMAL_MEMORY, so we need not to do the transition.
> 

One more time :)  Memoryless nodes do not have their bit set in 
N_HIGH_MEMORY.  When memory is added to a memoryless node with this new 
interface, does the bit get set?
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