> I've been thinking a bit about replacing the mapping and index members
> in struct page with a single pointer that point into a cluster data
> type. The cluster data type is aligned to a power of two and contains
> a header that is shared between all pages within the cluster. The
> header contains a base index and mapping. The rest of the cluster is
> an array of pfn:s that point back to the actual page.
Nice. While the code would probably do more references i bet
it would be faster overall because it would have less cache footprint.
But doing it would be a *lot* of editing work all over file systems/VM/etc.
-Andi
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