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    SubjectRe: [PATCH 15/15] readahead: pagecache context based mmap read-around
    On 02/23/2010 10:10 PM, Wu Fengguang wrote:
    > Do mmap read-around when there are cached pages in the nearby 256KB
    > (covered by one radix tree node).
    > There is a failure case though: for a sequence of page faults at page
    > index 64*i+1, i=1,2,3,..., this heuristic will keep doing pointless
    > read-arounds. Hopefully the pattern won't appear in real workloads.
    > Note that the readahead heuristic has similiar failure case.
    > CC: Nick Piggin<>
    > Signed-off-by: Wu Fengguang<>

    Acked-by: Rik van Riel <>

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      Last update: 2010-02-26 02:37    [W:0.030 / U:93.848 seconds]
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