On Thu, 27 Mar 2008, Jeremy Fitzhardinge wrote:

quoted text
> A 1G section size makes memory hotplug too coarse in a virtual
> environment.  Retuce it by a factor of 2 to 512M.  I would have liked
> to make it smaller, but it runs out of reserved flags in the page flags.

There are patches in mm which changes that situation. You should have 5 or 
6 more flags to play with.

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