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mempolicy: apply page table walker on queue_pages_range()
queue_pages_range() does page table walking in its own way now, but there is some code duplicate. This patch applies page table walker to reduce lines of code. queue_pages_range() has to do some precheck to determine whether we really walk over the vma or just skip it. Now we have test_walk() callback in mm_walk for this purpose, so we can do this replacement cleanly. queue_pages_test_walk() depends on not only the current vma but also the previous one, so queue_pages->prev is introduced to remember it. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi
Linus Torvalds
parent
1757bbd9c5
commit
6f4576e368
224
mm/mempolicy.c
224
mm/mempolicy.c
@ -471,24 +471,34 @@ static const struct mempolicy_operations mpol_ops[MPOL_MAX] = {
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static void migrate_page_add(struct page *page, struct list_head *pagelist,
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unsigned long flags);
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struct queue_pages {
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struct list_head *pagelist;
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unsigned long flags;
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nodemask_t *nmask;
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struct vm_area_struct *prev;
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};
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/*
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* Scan through pages checking if pages follow certain conditions,
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* and move them to the pagelist if they do.
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*/
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static int queue_pages_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long addr, unsigned long end,
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const nodemask_t *nodes, unsigned long flags,
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void *private)
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static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
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unsigned long end, struct mm_walk *walk)
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{
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pte_t *orig_pte;
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struct vm_area_struct *vma = walk->vma;
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struct page *page;
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struct queue_pages *qp = walk->private;
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unsigned long flags = qp->flags;
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int nid;
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pte_t *pte;
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spinlock_t *ptl;
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orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
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do {
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struct page *page;
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int nid;
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split_huge_page_pmd(vma, addr, pmd);
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if (pmd_trans_unstable(pmd))
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return 0;
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pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
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for (; addr != end; pte++, addr += PAGE_SIZE) {
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if (!pte_present(*pte))
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continue;
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page = vm_normal_page(vma, addr, *pte);
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@ -501,114 +511,46 @@ static int queue_pages_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
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if (PageReserved(page))
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continue;
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nid = page_to_nid(page);
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if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
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if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT))
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continue;
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if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
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migrate_page_add(page, private, flags);
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else
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break;
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} while (pte++, addr += PAGE_SIZE, addr != end);
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pte_unmap_unlock(orig_pte, ptl);
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return addr != end;
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migrate_page_add(page, qp->pagelist, flags);
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}
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pte_unmap_unlock(pte - 1, ptl);
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cond_resched();
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return 0;
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}
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static void queue_pages_hugetlb_pmd_range(struct vm_area_struct *vma,
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pmd_t *pmd, const nodemask_t *nodes, unsigned long flags,
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void *private)
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static int queue_pages_hugetlb(pte_t *pte, unsigned long hmask,
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unsigned long addr, unsigned long end,
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struct mm_walk *walk)
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{
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#ifdef CONFIG_HUGETLB_PAGE
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struct queue_pages *qp = walk->private;
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unsigned long flags = qp->flags;
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int nid;
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struct page *page;
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spinlock_t *ptl;
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pte_t entry;
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ptl = huge_pte_lock(hstate_vma(vma), vma->vm_mm, (pte_t *)pmd);
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entry = huge_ptep_get((pte_t *)pmd);
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ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte);
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entry = huge_ptep_get(pte);
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if (!pte_present(entry))
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goto unlock;
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page = pte_page(entry);
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nid = page_to_nid(page);
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if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
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if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT))
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goto unlock;
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/* With MPOL_MF_MOVE, we migrate only unshared hugepage. */
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if (flags & (MPOL_MF_MOVE_ALL) ||
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(flags & MPOL_MF_MOVE && page_mapcount(page) == 1))
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isolate_huge_page(page, private);
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isolate_huge_page(page, qp->pagelist);
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unlock:
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spin_unlock(ptl);
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#else
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BUG();
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#endif
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}
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static inline int queue_pages_pmd_range(struct vm_area_struct *vma, pud_t *pud,
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unsigned long addr, unsigned long end,
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const nodemask_t *nodes, unsigned long flags,
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void *private)
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{
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pmd_t *pmd;
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unsigned long next;
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pmd = pmd_offset(pud, addr);
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do {
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next = pmd_addr_end(addr, end);
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if (!pmd_present(*pmd))
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continue;
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if (pmd_huge(*pmd) && is_vm_hugetlb_page(vma)) {
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queue_pages_hugetlb_pmd_range(vma, pmd, nodes,
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flags, private);
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continue;
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}
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split_huge_page_pmd(vma, addr, pmd);
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if (pmd_none_or_trans_huge_or_clear_bad(pmd))
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continue;
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if (queue_pages_pte_range(vma, pmd, addr, next, nodes,
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flags, private))
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return -EIO;
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} while (pmd++, addr = next, addr != end);
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return 0;
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}
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static inline int queue_pages_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
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unsigned long addr, unsigned long end,
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const nodemask_t *nodes, unsigned long flags,
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void *private)
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{
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pud_t *pud;
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unsigned long next;
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pud = pud_offset(pgd, addr);
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do {
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next = pud_addr_end(addr, end);
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if (pud_huge(*pud) && is_vm_hugetlb_page(vma))
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continue;
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if (pud_none_or_clear_bad(pud))
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continue;
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if (queue_pages_pmd_range(vma, pud, addr, next, nodes,
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flags, private))
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return -EIO;
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} while (pud++, addr = next, addr != end);
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return 0;
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}
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static inline int queue_pages_pgd_range(struct vm_area_struct *vma,
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unsigned long addr, unsigned long end,
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const nodemask_t *nodes, unsigned long flags,
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void *private)
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{
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pgd_t *pgd;
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unsigned long next;
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pgd = pgd_offset(vma->vm_mm, addr);
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do {
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next = pgd_addr_end(addr, end);
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if (pgd_none_or_clear_bad(pgd))
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continue;
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if (queue_pages_pud_range(vma, pgd, addr, next, nodes,
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flags, private))
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return -EIO;
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} while (pgd++, addr = next, addr != end);
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return 0;
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}
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@ -641,6 +583,46 @@ static unsigned long change_prot_numa(struct vm_area_struct *vma,
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}
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#endif /* CONFIG_NUMA_BALANCING */
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static int queue_pages_test_walk(unsigned long start, unsigned long end,
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struct mm_walk *walk)
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{
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struct vm_area_struct *vma = walk->vma;
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struct queue_pages *qp = walk->private;
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unsigned long endvma = vma->vm_end;
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unsigned long flags = qp->flags;
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if (endvma > end)
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endvma = end;
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if (vma->vm_start > start)
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start = vma->vm_start;
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if (!(flags & MPOL_MF_DISCONTIG_OK)) {
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if (!vma->vm_next && vma->vm_end < end)
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return -EFAULT;
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if (qp->prev && qp->prev->vm_end < vma->vm_start)
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return -EFAULT;
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}
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qp->prev = vma;
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if (vma->vm_flags & VM_PFNMAP)
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return 1;
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if (flags & MPOL_MF_LAZY) {
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/* Similar to task_numa_work, skip inaccessible VMAs */
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if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
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change_prot_numa(vma, start, endvma);
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return 1;
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}
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if ((flags & MPOL_MF_STRICT) ||
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((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) &&
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vma_migratable(vma)))
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/* queue pages from current vma */
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return 0;
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return 1;
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}
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/*
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* Walk through page tables and collect pages to be migrated.
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*
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@ -650,50 +632,24 @@ static unsigned long change_prot_numa(struct vm_area_struct *vma,
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*/
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static int
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queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
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const nodemask_t *nodes, unsigned long flags, void *private)
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nodemask_t *nodes, unsigned long flags,
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struct list_head *pagelist)
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{
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int err = 0;
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struct vm_area_struct *vma, *prev;
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struct queue_pages qp = {
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.pagelist = pagelist,
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.flags = flags,
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.nmask = nodes,
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.prev = NULL,
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};
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struct mm_walk queue_pages_walk = {
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.hugetlb_entry = queue_pages_hugetlb,
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.pmd_entry = queue_pages_pte_range,
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.test_walk = queue_pages_test_walk,
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.mm = mm,
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.private = &qp,
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};
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vma = find_vma(mm, start);
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if (!vma)
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return -EFAULT;
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prev = NULL;
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for (; vma && vma->vm_start < end; vma = vma->vm_next) {
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unsigned long endvma = vma->vm_end;
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if (endvma > end)
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endvma = end;
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if (vma->vm_start > start)
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start = vma->vm_start;
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if (!(flags & MPOL_MF_DISCONTIG_OK)) {
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if (!vma->vm_next && vma->vm_end < end)
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return -EFAULT;
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if (prev && prev->vm_end < vma->vm_start)
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return -EFAULT;
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}
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if (flags & MPOL_MF_LAZY) {
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/* Similar to task_numa_work, skip inaccessible VMAs */
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if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
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change_prot_numa(vma, start, endvma);
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goto next;
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}
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if ((flags & MPOL_MF_STRICT) ||
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((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) &&
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vma_migratable(vma))) {
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err = queue_pages_pgd_range(vma, start, endvma, nodes,
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flags, private);
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if (err)
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break;
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}
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next:
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prev = vma;
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}
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return err;
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return walk_page_range(start, end, &queue_pages_walk);
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}
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/*
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