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

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Message-ID: <alpine.DEB.2.00.1011181326010.26680@chino.kir.corp.google.com>
Date:	Thu, 18 Nov 2010 13:28:45 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Paul Mundt <lethal@...ux-sh.org>
cc:	Shaohui Zheng <shaohui.zheng@...el.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, haicheng.li@...ux.intel.com,
	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>
Subject: Re: [7/8,v3] NUMA Hotplug Emulator: extend memory probe interface
 to support NUMA

On Thu, 18 Nov 2010, Paul Mundt wrote:

> This is all stuff that the memblock API can deal with, I'm not sure why
> there seems to be an insistence on wedging all manner of unrelated bits
> in to e820. Many platforms using memblock today already offline large
> amounts of contiguous physical memory for use in drivers, if you were to
> follow this scheme and simply layer a node creation shim on top of that
> you would end up with something that is almost entirely generic.
> 

I don't see why this patchset needs to use the memblock API at all, it 
should be built entirely on the generic mem-hotplug API.  The only 
extension needed is the remapping of removed memory to a new node id (done 
on x86 with update_nodes_add()) prior to add_memory() for each arch that 
supports onlining new nodes.
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