CVS commit: src/sys/arch/aarch64

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

Module Name:    src
Committed By:   skrll
Date:           Sun Oct 10 07:15:25 UTC 2021

Modified Files:
        src/sys/arch/aarch64/aarch64: pmap.c
        src/sys/arch/aarch64/conf: files.aarch64
        src/sys/arch/aarch64/include: cpu.h pmap.h pte.h types.h
Added Files:
        src/sys/arch/aarch64/aarch64: aarch64_tlb.c

Log Message:
Use sys/uvm/pmap/pmap_tlb.c on Aarch64 in the same way that some Arm, MIPS,
and some PPC kernels do.  This removes the limitation of 256 processes on
CPUs with 8bit ASID field, e.g. Apple M1.

Additionally the following changes have been made

- removed a couple of unnecessary aarch64_tlbi_all calls
- removed any invalidation after freeing page tables due to
  _pmap_sweep_pdp. This was never necessary afaict.
- all kernel mappings are marked global and userland mapping not-global.

Performance testing hasn't show a significant difference.  The data here
is from building a kernel on an lx2k system with nvme.

before
1489.6u 400.4s 2:40.65 1176.5% 228+224k 0+32289io 57pf+0w
1482.6u 403.2s 2:38.49 1189.9% 228+222k 0+32274io 46pf+0w
1485.4u 402.2s 2:37.27 1200.2% 228+222k 0+32275io 12pf+0w

after
1493.9u 404.6s 2:37.50 1205.4% 227+221k 0+32265io 48pf+0w
1485.0u 408.0s 2:38.54 1194.0% 227+222k 0+32272io 36pf+0w
1484.3u 407.0s 2:35.88 1213.3% 228+224k 0+32268io 14pf+0w

>>> stats.ttest_ind([160.65,158.49,157.27], [157.5,158.54,155.88])
Ttest_indResult(statistic=1.1923622711296888, pvalue=0.2990182944606766)
>>>


To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/sys/arch/aarch64/aarch64/aarch64_tlb.c
cvs rdiff -u -r1.116 -r1.117 src/sys/arch/aarch64/aarch64/pmap.c
cvs rdiff -u -r1.33 -r1.34 src/sys/arch/aarch64/conf/files.aarch64
cvs rdiff -u -r1.39 -r1.40 src/sys/arch/aarch64/include/cpu.h
cvs rdiff -u -r1.48 -r1.49 src/sys/arch/aarch64/include/pmap.h
cvs rdiff -u -r1.12 -r1.13 src/sys/arch/aarch64/include/pte.h
cvs rdiff -u -r1.19 -r1.20 src/sys/arch/aarch64/include/types.h

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