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Date:	Tue, 6 Mar 2007 15:16:07 +1100
From:	Paul Mackerras <>
To:	Linus Torvalds <>
Cc:	Balbir Singh <>,
	Andrew Morton <>,
	Mel Gorman <>,,,,,,,,
Subject: Re: The performance and behaviour of the anti-fragmentation related

Linus Torvalds writes:

> The point being that in the guests, hotunplug is almost useless (for 
> bigger ranges), and we're much better off just telling the virtualization 
> hosts on a per-page level whether we care about a page or not, than to 
> worry about fragmentation.

We don't have that luxury on IBM System p machines, where the
hypervisor manages memory in much larger units than a page.  Typically
the size of memory block that the hypervisor uses to manage memory is
16MB or more -- which makes sense from the point of view that if the
hypervisor had to manage individual pages, it would end up adding a
lot more overhead than it does.

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