Message-ID: <43EBB68A.3040105@austin.ibm.com>
Date: Thu, 09 Feb 2006 15:39:22 -0600
From: Joel Schopp <jschopp@austin.ibm.com>
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To: "Luck, Tony" <tony.luck@intel.com>
CC: Yasunori Goto <y-goto@jp.fujitsu.com>, Andi Kleen <ak@suse.de>,
       "Brown, Len" <len.brown@intel.com>,
       "Tolentino, Matthew E" <matthew.e.tolentino@intel.com>,
       "S, Naveen B" <naveen.b.s@intel.com>,
       Bjorn Helgaas <bjorn.helgaas@hp.com>,
       ACPI-ML <linux-acpi@vger.kernel.org>,
       Linux Kernel ML <linux-kernel@vger.kernel.org>,
       linux-ia64@vger.kernel.org, x86-64 Discuss <discuss@x86-64.org>,
       Linux Hotplug Memory Support 
	<lhms-devel@lists.sourceforge.net>
Subject: Re: [Lhms-devel] [RFC:PATCH(000/003)] Memory add to onlined node.
 (ver. 2)
References: <B8E391BBE9FE384DAA4C5C003888BE6F05AA16C3@scsmsx401.amr.corp.intel.com>
In-Reply-To: <B8E391BBE9FE384DAA4C5C003888BE6F05AA16C3@scsmsx401.amr.corp.intel.com>
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>> - if the node is already online.-  If the node is offline, 
>> (It means new node is comming!)  then the memory will belongs
>> to node 0 yet.
> 
> What is the long term plan to address this?  Can you make sure
> that the new node is always brought online before you get to
> this code?  Or will you have to bring the node online in the
> middle of the memory hot-add code?
> 
> Presumably there is a similar issue with hot add cpu.
> 

Yes, cpu hot add has the same issue.  It's really a performance issue, 
not a functional one so you haven't seen people beating down the doors 
to fix it.

Technically there isn't anything but manpower standing in the way of 
doing it.  But it is a good amount of work for the little it gains.

-Joel
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