linux-kernel - Re: [2/8, v5] NUMA Hotplug Emulator: Add node hotplug emulation

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Date:	Wed, 1 Dec 2010 07:16:13 +0800
From:	Shaohui Zheng <shaohui.zheng@...el.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	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, dave@...ux.vnet.ibm.com,
	gregkh@...e.de, Haicheng Li <haicheng.li@...el.com>
Subject: Re: [2/8, v5] NUMA Hotplug Emulator: Add node hotplug emulation

On Tue, Nov 30, 2010 at 12:10:09PM -0800, David Rientjes wrote:
> On Tue, 30 Nov 2010, Shaohui Zheng wrote:
> 
> > We have two memory hotplug interfaces here:
> > add_node: add a new NUMA node
> > probe: add memory section
> > 
> > so puting add_node to node/add_node and puting probe to memory/probe should make sense. 
> > it is similar with sysfs hierarchy.
> > 
> > if we want to move the add_node to mem_hotplug/add_node, I'd prefer to put the probe
> > interface to mem_hotplug/probe since they are also related to memory hotplug.
> > 
> > I will include this change in next patchset.
> > 
> 
> No, please don't move the 'probe' trigger to debugfs; hotadding memory 
> should not depend on CONFIG_DEBUG_FS.  Node hotplug emulation _is_ a 
> debugging function and can therefore be defined in debugfs as I did but 
> with a s/hotplug/mem_hotplug change that Greg suggested.

David,
	we provide both debugfs and sysfs interface for memory probe, the sysfs 
interface is always available. For debugfs interface, it depends on CONFIG_DEBUG_FS.
	we can also think that memory hotplug emulation _is_ a debuging function,
so we accept Dave's suggestion to provide debugfs interface.

-- 
Thanks & Regards,
Shaohui

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