This needs more performance test. But right now we are wasting lot of space in the level 4 page table.
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com> --- arch/powerpc/include/asm/book3s/64/hash-64k.h | 9 ++++----- arch/powerpc/include/asm/book3s/64/radix-64k.h | 8 ++++++++ 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h index 3bcf269f8f55..688f9018302e 100644 --- a/arch/powerpc/include/asm/book3s/64/hash-64k.h +++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h @@ -24,16 +24,15 @@ /* PTE flags to conserve for HPTE identification */ #define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | H_PAGE_COMBO) -/* - * we support 16 fragments per PTE page of 64K size. - */ -#define H_PTE_FRAG_NR 16 /* * We use a 2K PTE page fragment and another 2K for storing * real_pte_t hash index */ #define H_PTE_FRAG_SIZE_SHIFT 12 -#define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT) +/* + * we support 16 fragments per PTE page of 64K size. + */ +#define H_PTE_FRAG_NR (PAGE_SIZE >> RADIX_PTE_FRAG_SIZE_SHIFT) #ifndef __ASSEMBLY__ #include <asm/errno.h> diff --git a/arch/powerpc/include/asm/book3s/64/radix-64k.h b/arch/powerpc/include/asm/book3s/64/radix-64k.h index c7e71ba29555..8029732bb6c4 100644 --- a/arch/powerpc/include/asm/book3s/64/radix-64k.h +++ b/arch/powerpc/include/asm/book3s/64/radix-64k.h @@ -10,4 +10,12 @@ #define RADIX_PUD_INDEX_SIZE 9 #define RADIX_PGD_INDEX_SIZE 13 +/* + * We use a 256 byte PTE page fragment in radix + */ +#define RADIX_PTE_FRAG_SIZE_SHIFT 8 +/* + * we support 16 fragments per PTE page of 64K size. + */ +#define RADIX_PTE_FRAG_NR (PAGE_SIZE >> RADIX_PTE_FRAG_SIZE_SHIFT) #endif /* _ASM_POWERPC_PGTABLE_RADIX_64K_H */ -- 2.14.3
