From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- include/asm-arm/tlb.h | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 include/asm-arm/tlb.h (limited to 'include/asm-arm/tlb.h') diff --git a/include/asm-arm/tlb.h b/include/asm-arm/tlb.h new file mode 100644 index 00000000000..9bb325c5464 --- /dev/null +++ b/include/asm-arm/tlb.h @@ -0,0 +1,102 @@ +/* + * linux/include/asm-arm/tlb.h + * + * Copyright (C) 2002 Russell King + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Experimentation shows that on a StrongARM, it appears to be faster + * to use the "invalidate whole tlb" rather than "invalidate single + * tlb" for this. + * + * This appears true for both the process fork+exit case, as well as + * the munmap-large-area case. + */ +#ifndef __ASMARM_TLB_H +#define __ASMARM_TLB_H + +#include +#include +#include + +/* + * TLB handling. This allows us to remove pages from the page + * tables, and efficiently handle the TLB issues. + */ +struct mmu_gather { + struct mm_struct *mm; + unsigned int freed; + unsigned int fullmm; + + unsigned int flushes; + unsigned int avoided_flushes; +}; + +DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); + +static inline struct mmu_gather * +tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush) +{ + int cpu = smp_processor_id(); + struct mmu_gather *tlb = &per_cpu(mmu_gathers, cpu); + + tlb->mm = mm; + tlb->freed = 0; + tlb->fullmm = full_mm_flush; + + return tlb; +} + +static inline void +tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) +{ + struct mm_struct *mm = tlb->mm; + unsigned long freed = tlb->freed; + int rss = get_mm_counter(mm, rss); + + if (rss < freed) + freed = rss; + add_mm_counter(mm, rss, -freed); + + if (tlb->fullmm) + flush_tlb_mm(mm); + + /* keep the page table cache within bounds */ + check_pgt_cache(); +} + +static inline unsigned int tlb_is_full_mm(struct mmu_gather *tlb) +{ + return tlb->fullmm; +} + +#define tlb_remove_tlb_entry(tlb,ptep,address) do { } while (0) + +/* + * In the case of tlb vma handling, we can optimise these away in the + * case where we're doing a full MM flush. When we're doing a munmap, + * the vmas are adjusted to only cover the region to be torn down. + */ +static inline void +tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) +{ + if (!tlb->fullmm) + flush_cache_range(vma, vma->vm_start, vma->vm_end); +} + +static inline void +tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma) +{ + if (!tlb->fullmm) + flush_tlb_range(vma, vma->vm_start, vma->vm_end); +} + +#define tlb_remove_page(tlb,page) free_page_and_swap_cache(page) +#define pte_free_tlb(tlb,ptep) pte_free(ptep) +#define pmd_free_tlb(tlb,pmdp) pmd_free(pmdp) + +#define tlb_migrate_finish(mm) do { } while (0) + +#endif -- cgit v1.2.3