linux-kernel - Re: [8/8, v6] NUMA Hotplug Emulator: implement debugfs interface for memory probe

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Message-ID: <alpine.DEB.2.00.1012011807190.13942@chino.kir.corp.google.com>
Date:	Wed, 1 Dec 2010 18:13:18 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Shaohui Zheng <shaohui.zheng@...el.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, lethal@...ux-sh.org,
	Andi Kleen <ak@...ux.intel.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Greg KH <gregkh@...e.de>, Haicheng Li <haicheng.li@...el.com>
Subject: Re: [8/8, v6] NUMA Hotplug Emulator: implement debugfs interface
 for memory probe

On Thu, 2 Dec 2010, Shaohui Zheng wrote:

> so we should still keep the sysfs memory/probe interface without any modifications,
> but for the debugfs mem_hotplug/probe interface, we can add the memory region 
> to a desired node.

This feature would be distinct from the add_node interface already 
provided: instead of hotplugging a new node to test the memory hotplug 
callbacks, this new interface would only be hotadding new memory to a node 
other than the one it has physical affinity with.  For that support, I'd 
suggest new probe files in debugfs for each online node:

	/sys/kernel/debug/mem_hotplug/add_node (already exists)
	/sys/kernel/debug/mem_hotplug/node0/add_memory
	/sys/kernel/debug/mem_hotplug/node1/add_memory
	...

and then you can offline and remove that memory with the existing hotplug 
support (CONFIG_MEMORY_HOTPLUG and CONFIG_MEMORY_HOTREMOVE, respectively).
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