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4daf20b2f1
for user copyinout down to 12, and keeping segments 13/14 for kernel VA. It would be nice to have more available, but segments lower than this are reserved for either memory or 1:1 mapped device i/o, and seg 15 is OpenFirmware ROM. Also, the effort to keep OpenFirmware available for callbacks limits the use of VA-mapped segments. Fortunately UMA_MD_SMALL_ALLOC takes away a lot of VM pressure. Obtained from: NetBSD |
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psim |