From: David S. Miller Date: Thu, 15 Mar 2007 05:47:01 +0000 (-0700) Subject: [SPARC64]: Use SPARSEMEM_STATIC X-Git-Tag: v2.6.22-rc1~1127^2~23 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d78d0891d3dd976a2fb707c6c691d9cd5ed60727;p=linux-2.6 [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 --- diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig index 51c87fdd99..590a41b864 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 ed5c9d8541..411e0e255c 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__) */