The patch titled
Subject: mempolicy: apply page table walker on queue_pages_range()
has been added to the -mm tree. Its filename is
mempolicy-apply-page-table-walker-on-queue_pages_range.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mempolicy-apply-page-table-walker-on-queue_pages_range.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mempolicy-apply-page-table-walker-on-queue_pages_range.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 224 ++++++++++++++++++-----------------------------
1 file changed, 90 insertions(+), 134 deletions(-)
diff -puN mm/mempolicy.c~mempolicy-apply-page-table-walker-on-queue_pages_range mm/mempolicy.c
--- a/mm/mempolicy.c~mempolicy-apply-page-table-walker-on-queue_pages_range
+++ a/mm/mempolicy.c
@@ -471,24 +471,34 @@ static const struct mempolicy_operations
static void migrate_page_add(struct page *page, struct list_head *pagelist,
unsigned long flags);
+struct queue_pages {
+ struct list_head *pagelist;
+ unsigned long flags;
+ nodemask_t *nmask;
+ struct vm_area_struct *prev;
+};
+
/*
* Scan through pages checking if pages follow certain conditions,
* and move them to the pagelist if they do.
*/
-static int queue_pages_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- const nodemask_t *nodes, unsigned long flags,
- void *private)
+static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
+ unsigned long end, struct mm_walk *walk)
{
- pte_t *orig_pte;
+ struct vm_area_struct *vma = walk->vma;
+ struct page *page;
+ struct queue_pages *qp = walk->private;
+ unsigned long flags = qp->flags;
+ int nid;
pte_t *pte;
spinlock_t *ptl;
- orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
- do {
- struct page *page;
- int nid;
+ split_huge_page_pmd(vma, addr, pmd);
+ if (pmd_trans_unstable(pmd))
+ return 0;
+ pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
+ for (; addr != end; pte++, addr += PAGE_SIZE) {
if (!pte_present(*pte))
continue;
page = vm_normal_page(vma, addr, *pte);
@@ -501,114 +511,46 @@ static int queue_pages_pte_range(struct
if (PageReserved(page))
continue;
nid = page_to_nid(page);
- if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
+ if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT))
continue;
if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
- migrate_page_add(page, private, flags);
- else
- break;
- } while (pte++, addr += PAGE_SIZE, addr != end);
- pte_unmap_unlock(orig_pte, ptl);
- return addr != end;
+ migrate_page_add(page, qp->pagelist, flags);
+ }
+ pte_unmap_unlock(pte - 1, ptl);
+ cond_resched();
+ return 0;
}
-static void queue_pages_hugetlb_pmd_range(struct vm_area_struct *vma,
- pmd_t *pmd, const nodemask_t *nodes, unsigned long flags,
- void *private)
+static int queue_pages_hugetlb(pte_t *pte, unsigned long hmask,
+ unsigned long addr, unsigned long end,
+ struct mm_walk *walk)
{
#ifdef CONFIG_HUGETLB_PAGE
+ struct queue_pages *qp = walk->private;
+ unsigned long flags = qp->flags;
int nid;
struct page *page;
spinlock_t *ptl;
pte_t entry;
- ptl = huge_pte_lock(hstate_vma(vma), vma->vm_mm, (pte_t *)pmd);
- entry = huge_ptep_get((pte_t *)pmd);
+ ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte);
+ entry = huge_ptep_get(pte);
if (!pte_present(entry))
goto unlock;
page = pte_page(entry);
nid = page_to_nid(page);
- if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
+ if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT))
goto unlock;
/* With MPOL_MF_MOVE, we migrate only unshared hugepage. */
if (flags & (MPOL_MF_MOVE_ALL) ||
(flags & MPOL_MF_MOVE && page_mapcount(page) == 1))
- isolate_huge_page(page, private);
+ isolate_huge_page(page, qp->pagelist);
unlock:
spin_unlock(ptl);
#else
BUG();
#endif
-}
-
-static inline int queue_pages_pmd_range(struct vm_area_struct *vma, pud_t *pud,
- unsigned long addr, unsigned long end,
- const nodemask_t *nodes, unsigned long flags,
- void *private)
-{
- pmd_t *pmd;
- unsigned long next;
-
- pmd = pmd_offset(pud, addr);
- do {
- next = pmd_addr_end(addr, end);
- if (!pmd_present(*pmd))
- continue;
- if (pmd_huge(*pmd) && is_vm_hugetlb_page(vma)) {
- queue_pages_hugetlb_pmd_range(vma, pmd, nodes,
- flags, private);
- continue;
- }
- split_huge_page_pmd(vma, addr, pmd);
- if (pmd_none_or_trans_huge_or_clear_bad(pmd))
- continue;
- if (queue_pages_pte_range(vma, pmd, addr, next, nodes,
- flags, private))
- return -EIO;
- } while (pmd++, addr = next, addr != end);
- return 0;
-}
-
-static inline int queue_pages_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
- unsigned long addr, unsigned long end,
- const nodemask_t *nodes, unsigned long flags,
- void *private)
-{
- pud_t *pud;
- unsigned long next;
-
- pud = pud_offset(pgd, addr);
- do {
- next = pud_addr_end(addr, end);
- if (pud_huge(*pud) && is_vm_hugetlb_page(vma))
- continue;
- if (pud_none_or_clear_bad(pud))
- continue;
- if (queue_pages_pmd_range(vma, pud, addr, next, nodes,
- flags, private))
- return -EIO;
- } while (pud++, addr = next, addr != end);
- return 0;
-}
-
-static inline int queue_pages_pgd_range(struct vm_area_struct *vma,
- unsigned long addr, unsigned long end,
- const nodemask_t *nodes, unsigned long flags,
- void *private)
-{
- pgd_t *pgd;
- unsigned long next;
-
- pgd = pgd_offset(vma->vm_mm, addr);
- do {
- next = pgd_addr_end(addr, end);
- if (pgd_none_or_clear_bad(pgd))
- continue;
- if (queue_pages_pud_range(vma, pgd, addr, next, nodes,
- flags, private))
- return -EIO;
- } while (pgd++, addr = next, addr != end);
return 0;
}
@@ -641,6 +583,46 @@ static unsigned long change_prot_numa(st
}
#endif /* CONFIG_NUMA_BALANCING */
+static int queue_pages_test_walk(unsigned long start, unsigned long end,
+ struct mm_walk *walk)
+{
+ struct vm_area_struct *vma = walk->vma;
+ struct queue_pages *qp = walk->private;
+ unsigned long endvma = vma->vm_end;
+ unsigned long flags = qp->flags;
+
+ if (endvma > end)
+ endvma = end;
+ if (vma->vm_start > start)
+ start = vma->vm_start;
+
+ if (!(flags & MPOL_MF_DISCONTIG_OK)) {
+ if (!vma->vm_next && vma->vm_end < end)
+ return -EFAULT;
+ if (qp->prev && qp->prev->vm_end < vma->vm_start)
+ return -EFAULT;
+ }
+
+ qp->prev = vma;
+
+ if (vma->vm_flags & VM_PFNMAP)
+ return 1;
+
+ if (flags & MPOL_MF_LAZY) {
+ /* Similar to task_numa_work, skip inaccessible VMAs */
+ if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
+ change_prot_numa(vma, start, endvma);
+ return 1;
+ }
+
+ if ((flags & MPOL_MF_STRICT) ||
+ ((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) &&
+ vma_migratable(vma)))
+ /* queue pages from current vma */
+ return 0;
+ return 1;
+}
+
/*
* Walk through page tables and collect pages to be migrated.
*
@@ -650,50 +632,24 @@ static unsigned long change_prot_numa(st
*/
static int
queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
- const nodemask_t *nodes, unsigned long flags, void *private)
+ nodemask_t *nodes, unsigned long flags,
+ struct list_head *pagelist)
{
- int err = 0;
- struct vm_area_struct *vma, *prev;
+ struct queue_pages qp = {
+ .pagelist = pagelist,
+ .flags = flags,
+ .nmask = nodes,
+ .prev = NULL,
+ };
+ struct mm_walk queue_pages_walk = {
+ .hugetlb_entry = queue_pages_hugetlb,
+ .pmd_entry = queue_pages_pte_range,
+ .test_walk = queue_pages_test_walk,
+ .mm = mm,
+ .private = &qp,
+ };
- vma = find_vma(mm, start);
- if (!vma)
- return -EFAULT;
- prev = NULL;
- for (; vma && vma->vm_start < end; vma = vma->vm_next) {
- unsigned long endvma = vma->vm_end;
-
- if (endvma > end)
- endvma = end;
- if (vma->vm_start > start)
- start = vma->vm_start;
-
- if (!(flags & MPOL_MF_DISCONTIG_OK)) {
- if (!vma->vm_next && vma->vm_end < end)
- return -EFAULT;
- if (prev && prev->vm_end < vma->vm_start)
- return -EFAULT;
- }
-
- if (flags & MPOL_MF_LAZY) {
- /* Similar to task_numa_work, skip inaccessible VMAs */
- if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
- change_prot_numa(vma, start, endvma);
- goto next;
- }
-
- if ((flags & MPOL_MF_STRICT) ||
- ((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) &&
- vma_migratable(vma))) {
-
- err = queue_pages_pgd_range(vma, start, endvma, nodes,
- flags, private);
- if (err)
- break;
- }
-next:
- prev = vma;
- }
- return err;
+ return walk_page_range(start, end, &queue_pages_walk);
}
/*
_
Patches currently in -mm which might be from n-horiguchi@xxxxxxxxxxxxx are
mm-pagewalk-call-pte_hole-for-vm_pfnmap-during-walk_page_range.patch
mm-add-kpf_zero_page-flag-for-proc-kpageflags.patch
mm-hugetlb-reduce-arch-dependent-code-around-follow_huge_.patch
mm-hugetlb-pmd_huge-returns-true-for-non-present-hugepage.patch
mm-hugetlb-take-page-table-lock-in-follow_huge_pmd.patch
mm-hugetlb-fix-getting-refcount-0-page-in-hugetlb_fault.patch
mm-hugetlb-add-migration-hwpoisoned-entry-check-in-hugetlb_change_protection.patch
mm-hugetlb-add-migration-entry-check-in-__unmap_hugepage_range.patch
mm-hugetlb-fix-suboptimal-migration-hwpoisoned-entry-check.patch
mm-hugetlb-cleanup-and-rename-is_hugetlb_entry_migrationhwpoisoned.patch
mm-pagewalk-remove-pgd_entry-and-pud_entry.patch
revert-mm-pagewalk-call-pte_hole-for-vm_pfnmap-during-walk_page_range.patch
pagewalk-improve-vma-handling.patch
pagewalk-add-walk_page_vma.patch
smaps-remove-mem_size_stats-vma-and-use-walk_page_vma.patch
clear_refs-remove-clear_refs_private-vma-and-introduce-clear_refs_test_walk.patch
pagemap-use-walk-vma-instead-of-calling-find_vma.patch
numa_maps-fix-typo-in-gather_hugetbl_stats.patch
numa_maps-remove-numa_maps-vma.patch
memcg-cleanup-preparation-for-page-table-walk.patch
arch-powerpc-mm-subpage-protc-use-walk-vma-and-walk_page_vma.patch
mempolicy-apply-page-table-walker-on-queue_pages_range.patch
mm-proc-pid-clear_refs-avoid-split_huge_page.patch
mincore-apply-page-table-walker-on-do_mincore.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
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