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-rw-r--r--mm/migrate.c48
1 files changed, 19 insertions, 29 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 89a6bc8cd307..a20cf12edede 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -622,7 +622,6 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
int *result = NULL;
struct page *newpage = get_new_page(page, private, &result);
int remap_swapcache = 1;
- int rcu_locked = 0;
int charge = 0;
struct mem_cgroup *mem = NULL;
struct anon_vma *anon_vma = NULL;
@@ -694,20 +693,26 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
/*
* By try_to_unmap(), page->mapcount goes down to 0 here. In this case,
* we cannot notice that anon_vma is freed while we migrates a page.
- * This rcu_read_lock() delays freeing anon_vma pointer until the end
+ * This get_anon_vma() delays freeing anon_vma pointer until the end
* of migration. File cache pages are no problem because of page_lock()
* File Caches may use write_page() or lock_page() in migration, then,
* just care Anon page here.
*/
if (PageAnon(page)) {
- rcu_read_lock();
- rcu_locked = 1;
-
- /* Determine how to safely use anon_vma */
- if (!page_mapped(page)) {
- if (!PageSwapCache(page))
- goto rcu_unlock;
-
+ /*
+ * Only page_lock_anon_vma() understands the subtleties of
+ * getting a hold on an anon_vma from outside one of its mms.
+ */
+ anon_vma = page_lock_anon_vma(page);
+ if (anon_vma) {
+ /*
+ * Take a reference count on the anon_vma if the
+ * page is mapped so that it is guaranteed to
+ * exist when the page is remapped later
+ */
+ get_anon_vma(anon_vma);
+ page_unlock_anon_vma(anon_vma);
+ } else if (PageSwapCache(page)) {
/*
* We cannot be sure that the anon_vma of an unmapped
* swapcache page is safe to use because we don't
@@ -722,13 +727,7 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
*/
remap_swapcache = 0;
} else {
- /*
- * Take a reference count on the anon_vma if the
- * page is mapped so that it is guaranteed to
- * exist when the page is remapped later
- */
- anon_vma = page_anon_vma(page);
- get_anon_vma(anon_vma);
+ goto uncharge;
}
}
@@ -745,16 +744,10 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
* free the metadata, so the page can be freed.
*/
if (!page->mapping) {
- if (!PageAnon(page) && page_has_private(page)) {
- /*
- * Go direct to try_to_free_buffers() here because
- * a) that's what try_to_release_page() would do anyway
- * b) we may be under rcu_read_lock() here, so we can't
- * use GFP_KERNEL which is what try_to_release_page()
- * needs to be effective.
- */
+ VM_BUG_ON(PageAnon(page));
+ if (page_has_private(page)) {
try_to_free_buffers(page);
- goto rcu_unlock;
+ goto uncharge;
}
goto skip_unmap;
}
@@ -768,14 +761,11 @@ skip_unmap:
if (rc && remap_swapcache)
remove_migration_ptes(page, page);
-rcu_unlock:
/* Drop an anon_vma reference if we took one */
if (anon_vma)
drop_anon_vma(anon_vma);
- if (rcu_locked)
- rcu_read_unlock();
uncharge:
if (!charge)
mem_cgroup_end_migration(mem, page, newpage);