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    SubjectRe: [RFC v1][PATCH]page_fault retry with NOPAGE_RETRY
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    > Furthermore, /proc code usually isn't written with performance in mind,
    > so its usually simple and robust code. Adding it to a 'hot'-path like
    > you're doing doesn't seem advisable.
    >
    > Also, releasing and re-acquiring mmap_sem can significantly add to the
    > cacheline bouncing that thing already has.

    Interesting.

    I tryed to demonstration /proc slowness.

    1. make many process
    $ nice ./hackbench 120 process 10000

    2. read /proc
    $ time ps -ef

    0.16s user 0.57s system 1% cpu 46.859 total


    HAHAHA!
    That is really slow over my expected.





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