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-rw-r--r--mm/swap_state.c35
1 files changed, 19 insertions, 16 deletions
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 3353c9029ce..3ecea98ecb4 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -17,6 +17,7 @@
#include <linux/backing-dev.h>
#include <linux/pagevec.h>
#include <linux/migrate.h>
+#include <linux/page_cgroup.h>
#include <asm/pgtable.h>
@@ -72,10 +73,10 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp_mask)
{
int error;
- BUG_ON(!PageLocked(page));
- BUG_ON(PageSwapCache(page));
- BUG_ON(PagePrivate(page));
- BUG_ON(!PageSwapBacked(page));
+ VM_BUG_ON(!PageLocked(page));
+ VM_BUG_ON(PageSwapCache(page));
+ VM_BUG_ON(!PageSwapBacked(page));
+
error = radix_tree_preload(gfp_mask);
if (!error) {
page_cache_get(page);
@@ -108,10 +109,11 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp_mask)
*/
void __delete_from_swap_cache(struct page *page)
{
- BUG_ON(!PageLocked(page));
- BUG_ON(!PageSwapCache(page));
- BUG_ON(PageWriteback(page));
- BUG_ON(PagePrivate(page));
+ swp_entry_t ent = {.val = page_private(page)};
+
+ VM_BUG_ON(!PageLocked(page));
+ VM_BUG_ON(!PageSwapCache(page));
+ VM_BUG_ON(PageWriteback(page));
radix_tree_delete(&swapper_space.page_tree, page_private(page));
set_page_private(page, 0);
@@ -119,6 +121,7 @@ void __delete_from_swap_cache(struct page *page)
total_swapcache_pages--;
__dec_zone_page_state(page, NR_FILE_PAGES);
INC_CACHE_INFO(del_total);
+ mem_cgroup_uncharge_swapcache(page, ent);
}
/**
@@ -129,13 +132,13 @@ void __delete_from_swap_cache(struct page *page)
* Allocate swap space for the page and add the page to the
* swap cache. Caller needs to hold the page lock.
*/
-int add_to_swap(struct page * page, gfp_t gfp_mask)
+int add_to_swap(struct page *page)
{
swp_entry_t entry;
int err;
- BUG_ON(!PageLocked(page));
- BUG_ON(!PageUptodate(page));
+ VM_BUG_ON(!PageLocked(page));
+ VM_BUG_ON(!PageUptodate(page));
for (;;) {
entry = get_swap_page();
@@ -154,7 +157,7 @@ int add_to_swap(struct page * page, gfp_t gfp_mask)
* Add it to the swap cache and mark it dirty
*/
err = add_to_swap_cache(page, entry,
- gfp_mask|__GFP_NOMEMALLOC|__GFP_NOWARN);
+ __GFP_HIGH|__GFP_NOMEMALLOC|__GFP_NOWARN);
switch (err) {
case 0: /* Success */
@@ -196,14 +199,14 @@ void delete_from_swap_cache(struct page *page)
* If we are the only user, then try to free up the swap cache.
*
* Its ok to check for PageSwapCache without the page lock
- * here because we are going to recheck again inside
- * exclusive_swap_page() _with_ the lock.
+ * here because we are going to recheck again inside
+ * try_to_free_swap() _with_ the lock.
* - Marcelo
*/
static inline void free_swap_cache(struct page *page)
{
- if (PageSwapCache(page) && trylock_page(page)) {
- remove_exclusive_swap_page(page);
+ if (PageSwapCache(page) && !page_mapped(page) && trylock_page(page)) {
+ try_to_free_swap(page);
unlock_page(page);
}
}