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    SubjectRe: [PATCH 0/8][for -mm] mem_notify v6
    Hi Tom

    > Here's a test program that allocates memory and frees on notification.
    > It takes an argument which is the number of pages to use; use a
    > number considerably higher than the amount of memory in the system.
    > I'm running this on a system without swap. Each time it gets a
    > notification, it frees memory and writes out the /proc/meminfo
    > contents. What I see is that Cached gradually decreases, then Mapped
    > decreases, and eventually the kernel invokes the oom killer. It may
    > be necessary to tune some of the constants that control the allocation
    > and free rates and latency; these values work for my system.

    may be...

    I think you misunderstand madvise(MADV_DONTNEED).
    madvise(DONTNEED) indicate drop process page table.
    it mean become easily swap.

    when run on system without swap, madvise(DONTNEED) almost doesn't work
    as your expected.

    I am sorry for being not able to help you. ;)





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