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    SubjectRe: [PATCH] mm: implement WasActive page flag (for improving cleancache)
    On 01/26/2012 09:43 PM, Dan Magenheimer wrote:

    > Maybe the Active page bit could be overloaded with some minor
    > rewriting? IOW, perhaps the Active bit could be ignored when
    > the page is moved to the inactive LRU? (Confusing I know, but I am
    > just brainstorming...)

    The PG_referenced bit is already overloaded. We keep
    the bit set when we move a page from the active to the
    inactive list, so a page that was previously active
    only needs to be referenced once to become active again.

    The LRU bits (PG_lru, PG_active, etc) are needed to
    figure out which LRU list the page is on. I don't
    think we can overload those...

    All rights reversed

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