diff options
| author | David S. Miller <davem@sunset.davemloft.net> | 2007-03-14 22:47:01 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-26 01:55:22 -0700 |
| commit | d78d0891d3dd976a2fb707c6c691d9cd5ed60727 (patch) | |
| tree | 75a1f09a7f316c5cfd6ab3d1dc0e48e89320a200 | |
| parent | 43bed127376ff2ef9c268cf6688a43d0fbed2ff4 (diff) | |
[SPARC64]: Use SPARSEMEM_STATIC
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>
| -rw-r--r-- | arch/sparc64/Kconfig | 1 | ||||
| -rw-r--r-- | include/asm-sparc64/sparsemem.h | 6 |
2 files changed, 4 insertions, 3 deletions
diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig index 51c87fdd998c..590a41b864b9 100644 --- a/arch/sparc64/Kconfig +++ b/arch/sparc64/Kconfig @@ -220,6 +220,7 @@ config ARCH_SPARSEMEM_ENABLE config ARCH_SPARSEMEM_DEFAULT def_bool y + select SPARSEMEM_STATIC config LARGE_ALLOCS def_bool y diff --git a/include/asm-sparc64/sparsemem.h b/include/asm-sparc64/sparsemem.h index ed5c9d8541e2..411e0e255cf3 100644 --- a/include/asm-sparc64/sparsemem.h +++ b/include/asm-sparc64/sparsemem.h @@ -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__) */ |