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    SubjectSimple Code change suggestion : pdflush() : clean pages in 1/2 time

    pdflush threads clean dirty pages.

    Under the past simple assumption that a greater number of
    page daemon threads will have the TENDENCY to clean
    the pages faster.

    A simple change is to create 2x the number of threads
    within the same timeframe as before.

    Thus, in mm/pdflush.c _pdflush() thread creation is done
    in 1/2 HZ. ( "/" or ">>" , compiler will optimize)
    Above 1 sec omment should also be changed.

    IMO, We could do in 1/4 or 1/8 HZ, but load (backlog of dirty
    should then be tracked and watermarks set and determine whether
    keep adding additional threads allows us to clean the pages faster.
    (Yes, did that / done that and the code is/was ... too complicated)

    The 2nd part is to prevent thread creation / destruction thrashing,
    keep around the extra threads to handle the bursts of frees so HZ
    is still kept to limit exit rate.

    Mitchell Erblich

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      Last update: 2009-07-08 22:07    [W:0.037 / U:3.568 seconds]
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