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[SPARC64]: Use SPARSEMEM_STATIC

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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
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1
arch/sparc64/Kconfig
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@@ -220,6 +220,7 @@ config ARCH_SPARSEMEM_ENABLE
config ARCH_SPARSEMEM_DEFAULT config ARCH_SPARSEMEM_DEFAULT
def_bool y def_bool y
select SPARSEMEM_STATIC
config LARGE_ALLOCS config LARGE_ALLOCS
def_bool y def_bool y

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

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