mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-23 09:19:51 +00:00
Code Issues Releases Wiki Activity

[SPARC64]: Use SPARSEMEM_STATIC

Browse source 
Decrease the SECTION_SIZE_BITS --> MAX_PHYSADDR_BITS
range a little bit.

The cost of going to SPARSEMEM_STATIC becomes 8K of BSS space, and in
return we save a pointer dereferences on every page struct lookup.
Even better we hit the main kernel image for the base address which is
in a hugepage locked TLB entry.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-03-14 22:47:01 -07:00
parent 43bed12737
commit d78d0891d3
2 changed files with 4 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
arch/sparc64/Kconfig
View file

@ -220,6 +220,7 @@ config ARCH_SPARSEMEM_ENABLE
config ARCH_SPARSEMEM_DEFAULT
def_bool y
select SPARSEMEM_STATIC
config LARGE_ALLOCS
def_bool y

6
include/asm-sparc64/sparsemem.h
View file

@ -3,9 +3,9 @@
#ifdef __KERNEL__
#define SECTION_SIZE_BITS 26
#define MAX_PHYSADDR_BITS 42
#define MAX_PHYSMEM_BITS 42
#define SECTION_SIZE_BITS 31
#define MAX_PHYSADDR_BITS 41
#define MAX_PHYSMEM_BITS 41
#endif /* !(__KERNEL__) */