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authorragge <ragge@NetBSD.org>1997-11-02 14:25:24 +0000
committerragge <ragge@NetBSD.org>1997-11-02 14:25:24 +0000
commit9b1a735c8fd3a21dac541deda59dd2505bc2d65d (patch)
tree5e3fe463682b37b2dd62fea331abcc229ede27eb /sys/dev/microcode
parentc32b6d75d38dadf33fd8ba7a8c22d7051b28a448 (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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