diff options
| author | mdf <mdf@FreeBSD.org> | 2011-05-13 19:35:01 +0000 |
|---|---|---|
| committer | mdf <mdf@FreeBSD.org> | 2011-05-13 19:35:01 +0000 |
| commit | 3d3b036f9541230485c7edd1fafaec6e4345641a (patch) | |
| tree | a7b19af758b87ed8c5280b36452735563a1afd59 /sys/sparc64 | |
| parent | 9465c340011c0f0d939dc79a97cb31b7b974f015 (diff) | |
| download | FreeBSD-src-3d3b036f9541230485c7edd1fafaec6e4345641a.zip FreeBSD-src-3d3b036f9541230485c7edd1fafaec6e4345641a.tar.gz | |
Move the ZERO_REGION_SIZE to a machine-dependent file, as on many
architectures (i386, for example) the virtual memory space may be
constrained enough that 2MB is a large chunk. Use 64K for arches
other than amd64 and ia64, with special handling for sparc64 due to
differing hardware.
Also commit the comment changes to kmem_init_zero_region() that I
missed due to not saving the file. (Darn the unfamiliar development
environment).
Arch maintainers, please feel free to adjust ZERO_REGION_SIZE as you
see fit.
Requested by: alc
MFC after: 1 week
MFC with: r221853
Diffstat (limited to 'sys/sparc64')
| -rw-r--r-- | sys/sparc64/include/vmparam.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/sparc64/include/vmparam.h b/sys/sparc64/include/vmparam.h index 0638d0d..1b9e537 100644 --- a/sys/sparc64/include/vmparam.h +++ b/sys/sparc64/include/vmparam.h @@ -240,4 +240,11 @@ extern vm_offset_t vm_max_kernel_address; +/* + * Older sparc64 machines have a virtually indexed L1 data cache of 16KB. + * Consequently, mapping the same physical page multiple times may have + * caching disabled. + */ +#define ZERO_REGION_SIZE PAGE_SIZE + #endif /* !_MACHINE_VMPARAM_H_ */ |
