* threads/the swapper from ripping pte's out from under us.
*/
-static void sync_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
+static void msync_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end)
{
pte_t *pte;
+ int progress = 0;
+again:
pte = pte_offset_map(pmd, addr);
do {
unsigned long pfn;
struct page *page;
+ if (progress >= 64) {
+ progress = 0;
+ if (need_resched() ||
+ need_lockbreak(&vma->vm_mm->page_table_lock))
+ break;
+ }
+ progress++;
if (!pte_present(*pte))
continue;
if (!pte_maybe_dirty(*pte))
if (ptep_clear_flush_dirty(vma, addr, pte) ||
page_test_and_clear_dirty(page))
set_page_dirty(page);
+ progress += 3;
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap(pte - 1);
+ cond_resched_lock(&vma->vm_mm->page_table_lock);
+ if (addr != end)
+ goto again;
}
-static inline void sync_pmd_range(struct vm_area_struct *vma, pud_t *pud,
+static inline void msync_pmd_range(struct vm_area_struct *vma, pud_t *pud,
unsigned long addr, unsigned long end)
{
pmd_t *pmd;
next = pmd_addr_end(addr, end);
if (pmd_none_or_clear_bad(pmd))
continue;
- sync_pte_range(vma, pmd, addr, next);
+ msync_pte_range(vma, pmd, addr, next);
} while (pmd++, addr = next, addr != end);
}
-static inline void sync_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
+static inline void msync_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
unsigned long addr, unsigned long end)
{
pud_t *pud;
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
- sync_pmd_range(vma, pud, addr, next);
+ msync_pmd_range(vma, pud, addr, next);
} while (pud++, addr = next, addr != end);
}
-static void sync_page_range(struct vm_area_struct *vma,
+static void msync_page_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
- sync_pud_range(vma, pgd, addr, next);
+ msync_pud_range(vma, pgd, addr, next);
} while (pgd++, addr = next, addr != end);
spin_unlock(&mm->page_table_lock);
}
-#ifdef CONFIG_PREEMPT
-static inline void filemap_sync(struct vm_area_struct *vma,
- unsigned long addr, unsigned long end)
-{
- const size_t chunk = 64 * 1024; /* bytes */
- unsigned long next;
-
- do {
- next = addr + chunk;
- if (next > end || next < addr)
- next = end;
- sync_page_range(vma, addr, next);
- cond_resched();
- } while (addr = next, addr != end);
-}
-#else
-static inline void filemap_sync(struct vm_area_struct *vma,
- unsigned long addr, unsigned long end)
-{
- sync_page_range(vma, addr, end);
-}
-#endif
-
/*
* MS_SYNC syncs the entire file - including mappings.
*
return -EBUSY;
if (file && (vma->vm_flags & VM_SHARED)) {
- filemap_sync(vma, addr, end);
+ msync_page_range(vma, addr, end);
if (flags & MS_SYNC) {
struct address_space *mapping = file->f_mapping;