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Subject[PATCH 5/12] maps4: use pagewalker in clear_refs and smaps
Date
Use the generic pagewalker for smaps and clear_refs

Signed-off-by: Matt Mackall <mpm@selenic.com>

Index: l/fs/proc/task_mmu.c
===================================================================
--- l.orig/fs/proc/task_mmu.c 2007-10-22 16:24:47.000000000 -0500
+++ l/fs/proc/task_mmu.c 2007-10-22 17:51:18.000000000 -0500
@@ -135,6 +135,7 @@ static void pad_len_spaces(struct seq_fi

struct mem_size_stats
{
+ struct vm_area_struct *vma;
unsigned long resident;
unsigned long shared_clean;
unsigned long shared_dirty;
@@ -144,13 +145,6 @@ struct mem_size_stats
u64 pss;
};

-struct pmd_walker {
- struct vm_area_struct *vma;
- void *private;
- void (*action)(struct vm_area_struct *, pmd_t *, unsigned long,
- unsigned long, void *);
-};
-
static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
{
struct proc_maps_private *priv = m->private;
@@ -240,11 +234,11 @@ static int show_map(struct seq_file *m,
return show_map_internal(m, v, NULL);
}

-static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- void *private)
+static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
+ void *private)
{
struct mem_size_stats *mss = private;
+ struct vm_area_struct *vma = mss->vma;
pte_t *pte, ptent;
spinlock_t *ptl;
struct page *page;
@@ -282,12 +276,13 @@ static void smaps_pte_range(struct vm_ar
}
pte_unmap_unlock(pte - 1, ptl);
cond_resched();
+ return 0;
}

-static void clear_refs_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- void *private)
+static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
+ unsigned long end, void *private)
{
+ struct vm_area_struct *vma = private;
pte_t *pte, ptent;
spinlock_t *ptl;
struct page *page;
@@ -308,71 +303,10 @@ static void clear_refs_pte_range(struct
}
pte_unmap_unlock(pte - 1, ptl);
cond_resched();
+ return 0;
}

-static inline void walk_pmd_range(struct pmd_walker *walker, pud_t *pud,
- unsigned long addr, unsigned long end)
-{
- pmd_t *pmd;
- unsigned long next;
-
- for (pmd = pmd_offset(pud, addr); addr != end;
- pmd++, addr = next) {
- next = pmd_addr_end(addr, end);
- if (pmd_none_or_clear_bad(pmd))
- continue;
- walker->action(walker->vma, pmd, addr, next, walker->private);
- }
-}
-
-static inline void walk_pud_range(struct pmd_walker *walker, pgd_t *pgd,
- unsigned long addr, unsigned long end)
-{
- pud_t *pud;
- unsigned long next;
-
- for (pud = pud_offset(pgd, addr); addr != end;
- pud++, addr = next) {
- next = pud_addr_end(addr, end);
- if (pud_none_or_clear_bad(pud))
- continue;
- walk_pmd_range(walker, pud, addr, next);
- }
-}
-
-/*
- * walk_page_range - walk the page tables of a VMA with a callback
- * @vma - VMA to walk
- * @action - callback invoked for every bottom-level (PTE) page table
- * @private - private data passed to the callback function
- *
- * Recursively walk the page table for the memory area in a VMA, calling
- * a callback for every bottom-level (PTE) page table.
- */
-static inline void walk_page_range(struct vm_area_struct *vma,
- void (*action)(struct vm_area_struct *,
- pmd_t *, unsigned long,
- unsigned long, void *),
- void *private)
-{
- unsigned long addr = vma->vm_start;
- unsigned long end = vma->vm_end;
- struct pmd_walker walker = {
- .vma = vma,
- .private = private,
- .action = action,
- };
- pgd_t *pgd;
- unsigned long next;
-
- for (pgd = pgd_offset(vma->vm_mm, addr); addr != end;
- pgd++, addr = next) {
- next = pgd_addr_end(addr, end);
- if (pgd_none_or_clear_bad(pgd))
- continue;
- walk_pud_range(&walker, pgd, addr, next);
- }
-}
+static struct mm_walk smaps_walk = { .pmd_entry = smaps_pte_range };

static int show_smap(struct seq_file *m, void *v)
{
@@ -380,11 +314,15 @@ static int show_smap(struct seq_file *m,
struct mem_size_stats mss;

memset(&mss, 0, sizeof mss);
+ mss.vma = vma;
if (vma->vm_mm && !is_vm_hugetlb_page(vma))
- walk_page_range(vma, smaps_pte_range, &mss);
+ walk_page_range(vma->vm_mm, vma->vm_start, vma->vm_end,
+ &smaps_walk, &mss);
return show_map_internal(m, v, &mss);
}

+static struct mm_walk clear_refs_walk = { .pmd_entry = clear_refs_pte_range };
+
void clear_refs_smap(struct mm_struct *mm)
{
struct vm_area_struct *vma;
@@ -392,7 +330,8 @@ void clear_refs_smap(struct mm_struct *m
down_read(&mm->mmap_sem);
for (vma = mm->mmap; vma; vma = vma->vm_next)
if (vma->vm_mm && !is_vm_hugetlb_page(vma))
- walk_page_range(vma, clear_refs_pte_range, NULL);
+ walk_page_range(vma->vm_mm, vma->vm_start, vma->vm_end,
+ &clear_refs_walk, vma);
flush_tlb_mm(mm);
up_read(&mm->mmap_sem);
}
-
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