[PATCH V4 18/31] powerpc/mm: Increase the pte frag size.
From: Aneesh Kumar K.V <hidden>
Date: 2015-10-17 10:09:00
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
We will use the increased size to store more information of 4K pte when using 64K page size. The idea is to free up bits in pte_t. Acked-by: Scott Wood <redacted> Signed-off-by: Aneesh Kumar K.V <redacted> --- arch/powerpc/include/asm/pgalloc-64.h | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/include/asm/pgalloc-64.h b/arch/powerpc/include/asm/pgalloc-64.h
index d8cde71f6734..4f1cc6c46728 100644
--- a/arch/powerpc/include/asm/pgalloc-64.h
+++ b/arch/powerpc/include/asm/pgalloc-64.h@@ -164,15 +164,15 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, #else /* if CONFIG_PPC_64K_PAGES */ /* - * we support 16 fragments per PTE page. + * we support 8 fragments per PTE page. */ -#define PTE_FRAG_NR 16 +#define PTE_FRAG_NR 8 /* - * We use a 2K PTE page fragment and another 2K for storing - * real_pte_t hash index + * We use a 2K PTE page fragment and another 4K for storing + * real_pte_t hash index. Rounding the entire thing to 8K */ -#define PTE_FRAG_SIZE_SHIFT 12 -#define PTE_FRAG_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t)) +#define PTE_FRAG_SIZE_SHIFT 13 +#define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT) extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int); extern void page_table_free(struct mm_struct *, unsigned long *, int);
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2.5.0