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Hibernate time reduced

Contributed by rueda on 2021-08-31 from the
winter-of-our-disk-content dept.

Theo de Raadt (deraadt@) committed a change which significantly
reduces hibernate time on machines with larger amounts of RAM:

    CVSROOT:        /cvs
    Module name:    src
    Changes by:     deraadt@cvs.openbsd.org 2021/08/30 03:45:29

    Modified files:
            sys/kern       : subr_hibernate.c

    Log message:
    increase hibernate writeout speed a little.  modern machines have vast
    tracts of unused memory, and the empty-space RLE scanner (uvm_page_rle)
    would rescan for empty space needlessly wasting excessive cpu time
    16G machine, 100sec -> 9sec
    40G machine, 325sec -> 28sec
    with kettenis mlarkin

We are always happy to bear good news!

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