CVS commit: src/sys/arch/aarch64

["Nick Hudson" <skrll%netbsd.org@localhost>]

Module Name:    src
Committed By:   skrll
Date:           Wed Aug 12 13:36:36 UTC 2020

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

Log Message:
Part IV of ad's performance improvements for aarch64

- Implement pmap_growkernel(), and update kernel pmap's stats with atomics.

- Then, pmap_kenter_pa() and pmap_kremove() no longer need to allocate
  memory nor take pm_lock, because they only modify L3 PTEs.

- Then, pm_lock and pp_lock can be adaptive mutexes at IPL_NONE which are
  cheaper than spin mutexes.

- Take the pmap's lock in pmap_extract() if not the kernel's pmap, otherwise
  pmap_extract() might see inconsistent state.


To generate a diff of this commit:
cvs rdiff -u -r1.85 -r1.86 src/sys/arch/aarch64/aarch64/pmap.c
cvs rdiff -u -r1.41 -r1.42 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.