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    SubjectRe: [RFC] use radix_tree for non-resident page tracking
    On Mon, Oct 10, 2005 at 12:37:48PM -0400, Rik van Riel wrote:
    > > > How are you going to get the inter-reference distance
    > > > this way?
    > >
    > > How about taking down the current sum of `pgfree' in the slot?
    >
    > Sounds like a good idea to me. Definately worth a try!
    Thanks.
    I now realized that counters in struct zone should be better candidates.

    And the slots may be used to calculate the real inter-reference distances
    for dropped pages. For the present pages, we can either add entries to each
    page, or to radix_tree_node. I suspect the latter is enough because it should
    work well with sequential reads and sequential reads are the majority of page
    activities and the main source of flushing.

    --
    WU Fengguang
    Dept. of Automation
    University of Science and Technology of China
    Hefei, Anhui
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