On Mon, 18 Feb 2002, Linus Torvalds wrote:

On Mon, 18 Feb 2002, Rik van Riel wrote:

quoted

o page->zone is shrunk from a pointer to an index into a small
  array of zones ... this means we have space for 3 more chars
  in the struct page to other stuff (say, page->age)

Why not put "page->zone" into the page flags instead?

The original reason it's not in page->flags is that the
rmap patch also has page->age.

Furthermore, the NUMA folks wanted the ability to have
quite a few zones.

The patch looks good, it's just silly to say that you made "struct page"
smaller, and then waste four bytes.

If you want I'll look into shoving the zone bits into
page->flags ...

regards,

Rik
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