linux-kernel - Re: [PATCH] [5/8] Fix logic error in 64bit memory hotadd

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Date:	Tue, 12 Feb 2008 12:20:51 +0100
From:	Andi Kleen <ak@...e.de>
To:	Yasunori Goto <y-goto@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [5/8] Fix logic error in 64bit memory hotadd

On Tuesday 12 February 2008 11:35:22 Yasunori Goto wrote:
> Hi Ingo-san.
> 
> > > Does anyone even  
> > > use memory hotplug currently? 
> > 
> > I don't know.
> 
> IBM's powerpc box can memory hot-add/remove by dynamic partitioning.
> And our fujitsu server has memory hot-add feature (Ia-64).
> So, they are concrete user of memory hotplug.
> 
> In x86, E8500 chipset has the feature of memory-hotplug.
> (I searched a data-sheet from intel site.)
> http://download.intel.com/design/chipsets/e8500/datashts/30674501.pdf
> (6.3.8 IMI Hot-Plug)
> 
> So, it depends on how many server uses it, I think.

With the logic pud error i found and that seems currently will stay
for the forseeable future in the tree I don't think x86-64 64bit hotadds for more
than 1GB have ever worked with the sparsemem method.

Older trees (before 2.6.24) had also a different method that did
preallocate everything based on the SRAT. That one should have worked 
for this case.

-Andi
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