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authorragge <ragge@NetBSD.org>1997-11-02 14:25:26 +0000
committerragge <ragge@NetBSD.org>1997-11-02 14:25:26 +0000
commit4e254b7a8205c8020f273f7f033d368c62c3a65e (patch)
tree669caea027c1dadfea5e750b119901b0e12bcd3a /sys/dev/microcode
parenta8b7ec8d99a6c7e54d20dfbc1c4847e734485cb4 (diff)
Major rewriting, optimization and simplifying of the pmap code:
- Map in all physical memory first in system space. This reduces pmap_copy_page() and pmap_zero_page to 3 resp. 2 instructions. - Have fized position user page tables. Makes the pv_table smaller and all reverse references faster (and simpler). - Remove the wiring code. Nobody doesn't even know what a DR32 is anymore. - Simulate page reference bit by setting page invalid, as suggested by Rich Draves in a paper for 1991 Mach Usenix Symposium. This reduced the time spent in the pmap module to between 70-75% of the previous; and made process startup _much_ faster.
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