Re: [RFC] tabulating page->virtual on highmem

[William Lee Irwin III <wli@holomorphy.com>]

On Wed, May 08, 2002 at 03:15:06PM -0700, William Lee Irwin III wrote:
> The size of the kmap pool appears to dictate the number of distinct
> values of page->virtual. Maintaining an index into the pool would
> seem to provide superior space behavior, as the index need not be
> of full machine word precision. Furthermore, no auxiliary lookup
> would appear to be required as the kmap pool is virtually contiguous
> and so the virtual address could be calculated from base virtual
> address of the kmap pool and the index into the pool.
> For architectures using page->virtual for page_address() calculation
> this technique does not apply, and so page->virtual would then need
> to be maintained as is, or at least retain enough precision for a full
> page frame number.
> I don't have my heart set on this but I thought I'd at least throw the
> idea out where its desirability (and potential implementations) could
> be discussed.

Since no one's screamed too loudly I'll push out an implementation of
this sometime in the next few days.


Cheers,
Bill
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