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    SubjectRe: Swappiness vs. mmap() and interactive response
    >> Mapped page decrease rapidly: not happend (I guess, these page stay in
    >>                                           active list on my system)
    >> page fault large latency:     happend (latencytop display >200ms)
    > hm.  The last two observations appear to be inconsistent.

    it mean existing process don't slow down. but new process creation is very slow.

    > Elladan, have you checked to see whether the Mapped: number in
    > /proc/meminfo is decreasing?
    >> Then, I don't doubt vm replacement logic now.
    >> but I need more investigate.
    >> I plan to try following thing today and tommorow.
    >>  - XFS
    >>  - LVM
    >>  - another io scheduler (thanks Ted, good view point)
    >>  - Rik's new patch
    > It's not clear that we know what's happening yet, is it?  It's such a
    > gross problem that you'd think that even our testing would have found
    > it by now :(

    Yes, unclear. but various testing can drill down the reason, I think.

    > Elladan, do you know if earlier kernels (2.6.26 or thereabouts) had
    > this severe a problem?
    > (notes that we _still_ haven't unbusted prev_priority)
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