Clarifying memory management with page folios

Memory management generally works at the level of pages, which typically contain 4,096 bytes but may be larger. The kernel, though, has extended the concept of pages to include compound pages, which are groups of contiguous single pages. That, in turn, has made the definition of what a "page" is a bit fuzzy. Matthew Wilcox has been working since last year on a concept called "page folios" which is meant to bring the picture back into focus; whether the memory-management community will accept it remains unclear, though.

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