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    SubjectRe: [PATCH -mm] vmscan: make mapped executable pages the first class citizen
    On Thu, 7 May 2009, Lee Schermerhorn wrote:

    > > Another possibility may be to put the exec pages on the mlock list
    > > and scan the list if under extreme duress?
    >
    > Actually, you don't need to go thru the overhead of mucking with the
    > PG_mlocked flag which incurs the rmap walk on unlock, etc. If one sets
    > the the AS_UNEVICTABLE flag, the pages will be shuffled off the the
    > unevictable LRU iff we ever try to reclaim them. And, we do have the
    > function to scan the unevictable lru to "rescue" pages in a given
    > mapping should we want to bring them back under extreme load. We'd need
    > to remove the AS_UNEVICTABLE flag, first. This is how
    > SHM_LOCK/SHM_UNLOCK works.

    We need some way to control this. If there would be a way to simply switch
    off eviction of exec pages (via /proc/sys/vm/never_reclaim_exec_pages or
    so) I'd use it.




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