linux-kernel - Re: [7/8,v3] NUMA Hotplug Emulator: extend memory probe interface to support NUMA

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Date:	Wed, 17 Nov 2010 15:17:58 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
cc:	shaohui.zheng@...el.com, Andrew Morton <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,
	Haicheng Li <haicheng.li@...el.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Greg KH <greg@...ah.com>, Aaron Durbin <adurbin@...gle.com>
Subject: Re: [7/8,v3] NUMA Hotplug Emulator: extend memory probe interface
 to support NUMA

On Wed, 17 Nov 2010, Dave Hansen wrote:

> It's not just the mem_map[], though.  When a section is sitting
> "offline", it's pretty much all ready to go, except that its pages
> aren't in the allocators.  But, all of the other mm structures have
> already been modified to make room for the pages.  Zones have been added
> or modified, pgdats resized, 'struct page's initialized.
> 

Ok, so let's create an interface that compliments the probe interface that 
takes a quantity of memory to be hot-added from the amount of hidden RAM 
only after we fake the nodes_add array for each section within that 
quantity by calling update_nodes_add() and then looping through for each 
section calling add_memory().
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