From 2b0a9f017548f05e42fbf7e67c4a626c1ebd5e12 Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Wed, 3 Jul 2013 15:01:19 -0700 Subject: [PATCH] pagemap: introduce pagemap_entry_t without pmshift bits These bits are always constant (== PAGE_SHIFT) and just occupy space in the entry. Moreover, in next patch we will need to report one more bit in the pagemap, but all bits are already busy on it. That said, describe the pagemap entry that has 6 more free zero bits. Signed-off-by: Pavel Emelyanov Cc: Matt Mackall Cc: Xiao Guangrong Cc: Glauber Costa Cc: Marcelo Tosatti Cc: KOSAKI Motohiro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/task_mmu.c | 40 ++++++++++++++++++++++------------------ 1 file changed, 22 insertions(+), 18 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index ef6f6c6..39d6412 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -807,6 +807,7 @@ typedef struct { struct pagemapread { int pos, len; pagemap_entry_t *buffer; + bool v2; }; #define PAGEMAP_WALK_SIZE (PMD_SIZE) @@ -820,14 +821,16 @@ struct pagemapread { #define PM_PSHIFT_BITS 6 #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS) #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET) -#define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK) +#define __PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK) #define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1) #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK) +/* in "new" pagemap pshift bits are occupied with more status bits */ +#define PM_STATUS2(v2, x) (__PM_PSHIFT(v2 ? x : PAGE_SHIFT)) #define PM_PRESENT PM_STATUS(4LL) #define PM_SWAP PM_STATUS(2LL) #define PM_FILE PM_STATUS(1LL) -#define PM_NOT_PRESENT PM_PSHIFT(PAGE_SHIFT) +#define PM_NOT_PRESENT(v2) PM_STATUS2(v2, 0) #define PM_END_OF_BUFFER 1 static inline pagemap_entry_t make_pme(u64 val) @@ -850,7 +853,7 @@ static int pagemap_pte_hole(unsigned long start, unsigned long end, struct pagemapread *pm = walk->private; unsigned long addr; int err = 0; - pagemap_entry_t pme = make_pme(PM_NOT_PRESENT); + pagemap_entry_t pme = make_pme(PM_NOT_PRESENT(pm->v2)); for (addr = start; addr < end; addr += PAGE_SIZE) { err = add_to_pagemap(addr, &pme, pm); @@ -860,7 +863,7 @@ static int pagemap_pte_hole(unsigned long start, unsigned long end, return err; } -static void pte_to_pagemap_entry(pagemap_entry_t *pme, +static void pte_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm, struct vm_area_struct *vma, unsigned long addr, pte_t pte) { u64 frame, flags; @@ -879,18 +882,18 @@ static void pte_to_pagemap_entry(pagemap_entry_t *pme, if (is_migration_entry(entry)) page = migration_entry_to_page(entry); } else { - *pme = make_pme(PM_NOT_PRESENT); + *pme = make_pme(PM_NOT_PRESENT(pm->v2)); return; } if (page && !PageAnon(page)) flags |= PM_FILE; - *pme = make_pme(PM_PFRAME(frame) | PM_PSHIFT(PAGE_SHIFT) | flags); + *pme = make_pme(PM_PFRAME(frame) | PM_STATUS2(pm->v2, 0) | flags); } #ifdef CONFIG_TRANSPARENT_HUGEPAGE -static void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, +static void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm, pmd_t pmd, int offset) { /* @@ -900,12 +903,12 @@ static void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, */ if (pmd_present(pmd)) *pme = make_pme(PM_PFRAME(pmd_pfn(pmd) + offset) - | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT); + | PM_STATUS2(pm->v2, 0) | PM_PRESENT); else - *pme = make_pme(PM_NOT_PRESENT); + *pme = make_pme(PM_NOT_PRESENT(pm->v2)); } #else -static inline void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, +static inline void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm, pmd_t pmd, int offset) { } @@ -918,7 +921,7 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct pagemapread *pm = walk->private; pte_t *pte; int err = 0; - pagemap_entry_t pme = make_pme(PM_NOT_PRESENT); + pagemap_entry_t pme = make_pme(PM_NOT_PRESENT(pm->v2)); /* find the first VMA at or above 'addr' */ vma = find_vma(walk->mm, addr); @@ -928,7 +931,7 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, offset = (addr & ~PAGEMAP_WALK_MASK) >> PAGE_SHIFT; - thp_pmd_to_pagemap_entry(&pme, *pmd, offset); + thp_pmd_to_pagemap_entry(&pme, pm, *pmd, offset); err = add_to_pagemap(addr, &pme, pm); if (err) break; @@ -945,7 +948,7 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, * and need a new, higher one */ if (vma && (addr >= vma->vm_end)) { vma = find_vma(walk->mm, addr); - pme = make_pme(PM_NOT_PRESENT); + pme = make_pme(PM_NOT_PRESENT(pm->v2)); } /* check that 'vma' actually covers this address, @@ -953,7 +956,7 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, if (vma && (vma->vm_start <= addr) && !is_vm_hugetlb_page(vma)) { pte = pte_offset_map(pmd, addr); - pte_to_pagemap_entry(&pme, vma, addr, *pte); + pte_to_pagemap_entry(&pme, pm, vma, addr, *pte); /* unmap before userspace copy */ pte_unmap(pte); } @@ -968,14 +971,14 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, } #ifdef CONFIG_HUGETLB_PAGE -static void huge_pte_to_pagemap_entry(pagemap_entry_t *pme, +static void huge_pte_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm, pte_t pte, int offset) { if (pte_present(pte)) *pme = make_pme(PM_PFRAME(pte_pfn(pte) + offset) - | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT); + | PM_STATUS2(pm->v2, 0) | PM_PRESENT); else - *pme = make_pme(PM_NOT_PRESENT); + *pme = make_pme(PM_NOT_PRESENT(pm->v2)); } /* This function walks within one hugetlb entry in the single call */ @@ -989,7 +992,7 @@ static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask, for (; addr != end; addr += PAGE_SIZE) { int offset = (addr & ~hmask) >> PAGE_SHIFT; - huge_pte_to_pagemap_entry(&pme, *pte, offset); + huge_pte_to_pagemap_entry(&pme, pm, *pte, offset); err = add_to_pagemap(addr, &pme, pm); if (err) return err; @@ -1051,6 +1054,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, if (!count) goto out_task; + pm.v2 = false; pm.len = PM_ENTRY_BYTES * (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); pm.buffer = kmalloc(pm.len, GFP_TEMPORARY); ret = -ENOMEM; -- 2.7.4