CVS commit: src/sys/arch/aarch64

["Andrew Doran" <ad%netbsd.org@localhost>]

Module Name:    src
Committed By:   ad
Date:           Sun Jun 14 21:47:15 UTC 2020

Modified Files:
        src/sys/arch/aarch64/aarch64: pmap.c
        src/sys/arch/aarch64/include: pmap.h

Log Message:
- Fix a lock order reversal in pmap_page_protect().

- Make sure pmap is always locked when updating stats; atomics no longer
  needed to do that.

- Remove unneeded traversal of pv list in pmap_enter_pv().

- Shrink struct vm_page from 136 to 128 bytes (cache line sized) and struct
  pv_entry from 48 to 32 bytes (power of 2 sized).

- Embed a pv_entry in each vm_page.  This means PV entries don't need to
  be allocated for private anonymous memory / COW pages / most UBC mappings.
  Dynamic PV entries are then used only for stuff like shared libraries and
  shared memory.

Proposed on port-arm@.


To generate a diff of this commit:
cvs rdiff -u -r1.77 -r1.78 src/sys/arch/aarch64/aarch64/pmap.c
cvs rdiff -u -r1.39 -r1.40 src/sys/arch/aarch64/include/pmap.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.