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-rw-r--r--mm/migrate.c85
1 files changed, 18 insertions, 67 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 367272d0442..0b714747c02 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -21,6 +21,7 @@
#include <linux/mm_inline.h>
#include <linux/nsproxy.h>
#include <linux/pagevec.h>
+#include <linux/ksm.h>
#include <linux/rmap.h>
#include <linux/topology.h>
#include <linux/cpu.h>
@@ -78,8 +79,8 @@ int putback_lru_pages(struct list_head *l)
/*
* Restore a potential migration pte to a working pte entry
*/
-static void remove_migration_pte(struct vm_area_struct *vma,
- struct page *old, struct page *new)
+static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
+ unsigned long addr, void *old)
{
struct mm_struct *mm = vma->vm_mm;
swp_entry_t entry;
@@ -88,40 +89,37 @@ static void remove_migration_pte(struct vm_area_struct *vma,
pmd_t *pmd;
pte_t *ptep, pte;
spinlock_t *ptl;
- unsigned long addr = page_address_in_vma(new, vma);
-
- if (addr == -EFAULT)
- return;
pgd = pgd_offset(mm, addr);
if (!pgd_present(*pgd))
- return;
+ goto out;
pud = pud_offset(pgd, addr);
if (!pud_present(*pud))
- return;
+ goto out;
pmd = pmd_offset(pud, addr);
if (!pmd_present(*pmd))
- return;
+ goto out;
ptep = pte_offset_map(pmd, addr);
if (!is_swap_pte(*ptep)) {
pte_unmap(ptep);
- return;
+ goto out;
}
ptl = pte_lockptr(mm, pmd);
spin_lock(ptl);
pte = *ptep;
if (!is_swap_pte(pte))
- goto out;
+ goto unlock;
entry = pte_to_swp_entry(pte);
- if (!is_migration_entry(entry) || migration_entry_to_page(entry) != old)
- goto out;
+ if (!is_migration_entry(entry) ||
+ migration_entry_to_page(entry) != old)
+ goto unlock;
get_page(new);
pte = pte_mkold(mk_pte(new, vma->vm_page_prot));
@@ -137,55 +135,10 @@ static void remove_migration_pte(struct vm_area_struct *vma,
/* No need to invalidate - it was non-present before */
update_mmu_cache(vma, addr, pte);
-
-out:
+unlock:
pte_unmap_unlock(ptep, ptl);
-}
-
-/*
- * Note that remove_file_migration_ptes will only work on regular mappings,
- * Nonlinear mappings do not use migration entries.
- */
-static void remove_file_migration_ptes(struct page *old, struct page *new)
-{
- struct vm_area_struct *vma;
- struct address_space *mapping = new->mapping;
- struct prio_tree_iter iter;
- pgoff_t pgoff = new->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
-
- if (!mapping)
- return;
-
- spin_lock(&mapping->i_mmap_lock);
-
- vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff)
- remove_migration_pte(vma, old, new);
-
- spin_unlock(&mapping->i_mmap_lock);
-}
-
-/*
- * Must hold mmap_sem lock on at least one of the vmas containing
- * the page so that the anon_vma cannot vanish.
- */
-static void remove_anon_migration_ptes(struct page *old, struct page *new)
-{
- struct anon_vma *anon_vma;
- struct vm_area_struct *vma;
-
- /*
- * We hold the mmap_sem lock. So no need to call page_lock_anon_vma.
- */
- anon_vma = page_anon_vma(new);
- if (!anon_vma)
- return;
-
- spin_lock(&anon_vma->lock);
-
- list_for_each_entry(vma, &anon_vma->head, anon_vma_node)
- remove_migration_pte(vma, old, new);
-
- spin_unlock(&anon_vma->lock);
+out:
+ return SWAP_AGAIN;
}
/*
@@ -194,10 +147,7 @@ static void remove_anon_migration_ptes(struct page *old, struct page *new)
*/
static void remove_migration_ptes(struct page *old, struct page *new)
{
- if (PageAnon(new))
- remove_anon_migration_ptes(old, new);
- else
- remove_file_migration_ptes(old, new);
+ rmap_walk(new, remove_migration_pte, old);
}
/*
@@ -358,6 +308,7 @@ static void migrate_page_copy(struct page *newpage, struct page *page)
}
mlock_migrate_page(newpage, page);
+ ksm_migrate_page(newpage, page);
ClearPageSwapCache(page);
ClearPagePrivate(page);
@@ -577,9 +528,9 @@ static int move_to_new_page(struct page *newpage, struct page *page)
else
rc = fallback_migrate_page(mapping, newpage, page);
- if (!rc) {
+ if (!rc)
remove_migration_ptes(page, newpage);
- } else
+ else
newpage->mapping = NULL;
unlock_page(newpage);