On Thu, 18 Jan 2001, Linus Torvalds wrote:

Whatever. Maybe it can be done other ways. The fact that the way I
thought to implement it was with an order-2 allocation to do this
efficiently is what really killed it for me. [...]

it can be done by 'implicitly' linking the soft and hard table via putting
it on the same 8K-aligned order-2 page, but linking them through their
mem_map[] entries. The fields of mem_map[] entries of ordinary pagetables
are largely unused, they are privately allocated pages.

	Ingo

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