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    SubjectRe: [patch] vmfixes-2.4.0-test9-B2 - fixing deadlocks
    On Fri, 29 Sep 2000, Andrea Arcangeli wrote:
    > On Fri, Sep 29, 2000 at 11:39:18AM -0300, Rik van Riel wrote:
    > > OK, good to see that we agree on the fact that we
    > > should age and swapout all pages equally agressively.
    >
    > Actually I think we should start looking at the mapped stuff
    > _only_ when the I/O cache aging is relevant. If the I/O cache
    > aging isn't relevant there's no point to look at the mapped
    > stuff since there's cache pollution going on.

    > If the cache is re-used (so if it's useful) that's completly
    > different issue and in that case unmapping potentially unused
    > stuff is the right thing to do of course.

    This is why I want to do:

    1) equal aging of all pages in the system
    2) page aging to have properties of both LRU and LFU
    3) drop-behind to cope with streaming IO in a good way

    and maybe:
    4) move unmapped pages to the inactive_clean list for
    immediate reclaiming but put pages which are/were
    mapped on the inactive_dirty list so we keep it a
    little bit longer


    The only way to reliably know if the cache is re-used a
    lot is by making sure we do the page aging for unmapped
    and mapped pages the same. If we don't do that, we won't
    be able to make a sensible comparison between the activity
    of pages in different places.

    regards,

    Rik
    --
    "What you're running that piece of shit Gnome?!?!"
    -- Miguel de Icaza, UKUUG 2000

    http://www.conectiva.com/ http://www.surriel.com/

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