linux-kernel - Re: [2/8,v3] NUMA Hotplug Emulator: infrastructure of NUMA hotplug emulation

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Message-ID: <20101118052750.GD2408@shaohui>
Date:	Thu, 18 Nov 2010 13:27:50 +0800
From:	Shaohui Zheng <shaohui.zheng@...el.com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <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,
	Yinghai Lu <yinghai@...nel.org>,
	Haicheng Li <haicheng.li@...el.com>
Subject: Re: [2/8,v3] NUMA Hotplug Emulator: infrastructure of NUMA hotplug
 emulation

On Thu, Nov 18, 2010 at 03:27:15PM +0900, Paul Mundt wrote:
> On Thu, Nov 18, 2010 at 12:14:07PM +0800, Shaohui Zheng wrote:
> > On Wed, Nov 17, 2010 at 01:10:50PM -0800, David Rientjes wrote:
> > > The idea that I've proposed (and you've apparently thought about and even 
> > > implemented at one point) is much more powerful than that.  We need not 
> > > query the state of hidden nodes that we've setup at boot but can rather 
> > > use the amount of hidden memory to setup the nodes in any way that we want 
> > > at runtime (various sizes, interleaved node ids, etc).
> > 
> > yes, if we select your proposal. we just mark all the nodes as POSSIBLE node.
> > there is no hidden nodes any more. the node will be created after add memory
> > to the node first time. 
> > 
> This is roughly what I had in mind in my N_HIDDEN review, so I quite
> favour this approach.

Our testing shows that it is a feasible approach, and it works well.
however, there is still a problem which we should worry about.

in our draft patch, we re-setup nr_node_ids when CONFIG_ARCH_MEMORY_PROBE enabled 
and mem=XXX was specified in grub. we set nr_node_ids as MAX_NUMNODES + 1, because
 we do not know how many nodes will be hot-added through memory/probe interface. 
 it might be a little wasting of memory.

-- 
Thanks & Regards,
Shaohui

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