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    SubjectRe: Downsides to madvise/fadvise(willneed) for application startup
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    Taras Glek <tglek@mozilla.com> writes:

    > Hello,
    > I am working on improving Mozilla startup times. It turns out that
    > page faults(caused by lack of cooperation between user/kernelspace)
    > are the main cause of slow startup. I need some insights from someone
    > who understands linux vm behavior.

    I have an older patch to create dynamic bitmaps based on the last
    run and only prefetch those pages.

    It wasn't entirely a win for everything and didn't work for shared
    libraries, but with some additional tuning the approach still has
    potential I think, by combining memory saving with prefetching.

    ftp://firstfloor.org/pub/ak/pbitmap/INTRO
    http://halobates.de/dp2.pdf

    For your use case the algorithm would likely need some glibc support.

    -Andi

    --
    ak@linux.intel.com -- Speaking for myself only.


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