----- Original Message -----one. rence e At first, what I have to say is "this is a fix against handle-swapcache patch not against remove-refcnt" This complex comes from handle-swapcache. (But it's necessary.) no What the old code does was - a page is added to rmap (mapcount 0->1) +1 - a page is removed from rmap (mapcount ->0) -1 - a page is added to radix-tree (+1) - a page is removed from radix-tree (-1) All information is recorded in struct page because it exists for. Then, why duplicates information ? It's usually bad habit. if we want) e About swap-cache, refcnt is just obstacle because you can't handle add-to-swapcache by refcnt. If you want to add refcnt (or some code) for "debug", I have no objection. Thanks, -Kame --
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