[PATCH 2/3] mm: simplify lock_page_memcg()
From: Johannes Weiner
Date: Fri Jan 29 2016 - 18:21:07 EST
Now that migration doesn't clear page->mem_cgroup of live pages
anymore, it's safe to make lock_page_memcg() and the memcg stat
functions take pages, and spare the callers from memcg objects.
Suggested-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
fs/buffer.c | 18 ++++++++---------
fs/xfs/xfs_aops.c | 7 +++----
include/linux/memcontrol.h | 34 ++++++++++++++++----------------
include/linux/mm.h | 5 ++---
include/linux/pagemap.h | 3 +--
mm/filemap.c | 20 ++++++++-----------
mm/memcontrol.c | 23 +++++++++-------------
mm/page-writeback.c | 49 ++++++++++++++++++++--------------------------
mm/rmap.c | 16 ++++++---------
mm/truncate.c | 9 ++++-----
mm/vmscan.c | 11 +++++------
mm/workingset.c | 9 ++++-----
12 files changed, 88 insertions(+), 116 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index dc991510bb06..33be29675358 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -624,14 +624,14 @@ EXPORT_SYMBOL(mark_buffer_dirty_inode);
* The caller must hold lock_page_memcg().
*/
static void __set_page_dirty(struct page *page, struct address_space *mapping,
- struct mem_cgroup *memcg, int warn)
+ int warn)
{
unsigned long flags;
spin_lock_irqsave(&mapping->tree_lock, flags);
if (page->mapping) { /* Race with truncate? */
WARN_ON_ONCE(warn && !PageUptodate(page));
- account_page_dirtied(page, mapping, memcg);
+ account_page_dirtied(page, mapping);
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
@@ -666,7 +666,6 @@ static void __set_page_dirty(struct page *page, struct address_space *mapping,
int __set_page_dirty_buffers(struct page *page)
{
int newly_dirty;
- struct mem_cgroup *memcg;
struct address_space *mapping = page_mapping(page);
if (unlikely(!mapping))
@@ -686,14 +685,14 @@ int __set_page_dirty_buffers(struct page *page)
* Lock out page->mem_cgroup migration to keep PageDirty
* synchronized with per-memcg dirty page counters.
*/
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
newly_dirty = !TestSetPageDirty(page);
spin_unlock(&mapping->private_lock);
if (newly_dirty)
- __set_page_dirty(page, mapping, memcg, 1);
+ __set_page_dirty(page, mapping, 1);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
if (newly_dirty)
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
@@ -1167,15 +1166,14 @@ void mark_buffer_dirty(struct buffer_head *bh)
if (!test_set_buffer_dirty(bh)) {
struct page *page = bh->b_page;
struct address_space *mapping = NULL;
- struct mem_cgroup *memcg;
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
if (!TestSetPageDirty(page)) {
mapping = page_mapping(page);
if (mapping)
- __set_page_dirty(page, mapping, memcg, 0);
+ __set_page_dirty(page, mapping, 0);
}
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
if (mapping)
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
}
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 28eb6f535ca9..f73d009143e2 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -1953,7 +1953,6 @@ xfs_vm_set_page_dirty(
loff_t end_offset;
loff_t offset;
int newly_dirty;
- struct mem_cgroup *memcg;
if (unlikely(!mapping))
return !TestSetPageDirty(page);
@@ -1977,7 +1976,7 @@ xfs_vm_set_page_dirty(
* Lock out page->mem_cgroup migration to keep PageDirty
* synchronized with per-memcg dirty page counters.
*/
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
newly_dirty = !TestSetPageDirty(page);
spin_unlock(&mapping->private_lock);
@@ -1988,13 +1987,13 @@ xfs_vm_set_page_dirty(
spin_lock_irqsave(&mapping->tree_lock, flags);
if (page->mapping) { /* Race with truncate? */
WARN_ON_ONCE(!PageUptodate(page));
- account_page_dirtied(page, mapping, memcg);
+ account_page_dirtied(page, mapping);
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
spin_unlock_irqrestore(&mapping->tree_lock, flags);
}
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
if (newly_dirty)
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
return newly_dirty;
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index b246e1b1fd4b..c355efff8148 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -455,42 +455,42 @@ bool mem_cgroup_oom_synchronize(bool wait);
extern int do_swap_account;
#endif
-struct mem_cgroup *lock_page_memcg(struct page *page);
-void unlock_page_memcg(struct mem_cgroup *memcg);
+void lock_page_memcg(struct page *page);
+void unlock_page_memcg(struct page *page);
/**
* mem_cgroup_update_page_stat - update page state statistics
- * @memcg: memcg to account against
+ * @page: the page
* @idx: page state item to account
* @val: number of pages (positive or negative)
*
* Callers must use lock_page_memcg() to prevent double accounting
* when the page is concurrently being moved to another memcg:
*
- * memcg = lock_page_memcg(page);
+ * lock_page_memcg(page);
* if (TestClearPageState(page))
- * mem_cgroup_update_page_stat(memcg, state, -1);
- * unlock_page_memcg(memcg);
+ * mem_cgroup_update_page_stat(page, state, -1);
+ * unlock_page_memcg(page);
*/
-static inline void mem_cgroup_update_page_stat(struct mem_cgroup *memcg,
+static inline void mem_cgroup_update_page_stat(struct page *page,
enum mem_cgroup_stat_index idx, int val)
{
VM_BUG_ON(!rcu_read_lock_held());
- if (memcg)
- this_cpu_add(memcg->stat->count[idx], val);
+ if (page->mem_cgroup)
+ this_cpu_add(page->mem_cgroup->stat->count[idx], val);
}
-static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg,
+static inline void mem_cgroup_inc_page_stat(struct page *page,
enum mem_cgroup_stat_index idx)
{
- mem_cgroup_update_page_stat(memcg, idx, 1);
+ mem_cgroup_update_page_stat(page, idx, 1);
}
-static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg,
+static inline void mem_cgroup_dec_page_stat(struct page *page,
enum mem_cgroup_stat_index idx)
{
- mem_cgroup_update_page_stat(memcg, idx, -1);
+ mem_cgroup_update_page_stat(page, idx, -1);
}
unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
@@ -661,12 +661,12 @@ mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
{
}
-static inline struct mem_cgroup *lock_page_memcg(struct page *page)
+static inline void lock_page_memcg(struct page *page)
{
return NULL;
}
-static inline void unlock_page_memcg(struct mem_cgroup *memcg)
+static inline void unlock_page_memcg(struct page *page)
{
}
@@ -692,12 +692,12 @@ static inline bool mem_cgroup_oom_synchronize(bool wait)
return false;
}
-static inline void mem_cgroup_inc_page_stat(struct mem_cgroup *memcg,
+static inline void mem_cgroup_inc_page_stat(struct page *page,
enum mem_cgroup_stat_index idx)
{
}
-static inline void mem_cgroup_dec_page_stat(struct mem_cgroup *memcg,
+static inline void mem_cgroup_dec_page_stat(struct page *page,
enum mem_cgroup_stat_index idx)
{
}
diff --git a/include/linux/mm.h b/include/linux/mm.h
index d11955f2d69c..05a51c0fe872 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1290,10 +1290,9 @@ int __set_page_dirty_nobuffers(struct page *page);
int __set_page_dirty_no_writeback(struct page *page);
int redirty_page_for_writepage(struct writeback_control *wbc,
struct page *page);
-void account_page_dirtied(struct page *page, struct address_space *mapping,
- struct mem_cgroup *memcg);
+void account_page_dirtied(struct page *page, struct address_space *mapping);
void account_page_cleaned(struct page *page, struct address_space *mapping,
- struct mem_cgroup *memcg, struct bdi_writeback *wb);
+ struct bdi_writeback *wb);
int set_page_dirty(struct page *page);
int set_page_dirty_lock(struct page *page);
void cancel_dirty_page(struct page *page);
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 92395a0a7dc5..183b15ea052b 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -663,8 +663,7 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
pgoff_t index, gfp_t gfp_mask);
extern void delete_from_page_cache(struct page *page);
-extern void __delete_from_page_cache(struct page *page, void *shadow,
- struct mem_cgroup *memcg);
+extern void __delete_from_page_cache(struct page *page, void *shadow);
int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask);
/*
diff --git a/mm/filemap.c b/mm/filemap.c
index 37d0ecb94061..b9b1cb2ce40b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -179,8 +179,7 @@ static void page_cache_tree_delete(struct address_space *mapping,
* is safe. The caller must hold the mapping's tree_lock and
* lock_page_memcg().
*/
-void __delete_from_page_cache(struct page *page, void *shadow,
- struct mem_cgroup *memcg)
+void __delete_from_page_cache(struct page *page, void *shadow)
{
struct address_space *mapping = page->mapping;
@@ -216,8 +215,7 @@ void __delete_from_page_cache(struct page *page, void *shadow,
* anyway will be cleared before returning page into buddy allocator.
*/
if (WARN_ON_ONCE(PageDirty(page)))
- account_page_cleaned(page, mapping, memcg,
- inode_to_wb(mapping->host));
+ account_page_cleaned(page, mapping, inode_to_wb(mapping->host));
}
/**
@@ -231,7 +229,6 @@ void __delete_from_page_cache(struct page *page, void *shadow,
void delete_from_page_cache(struct page *page)
{
struct address_space *mapping = page->mapping;
- struct mem_cgroup *memcg;
unsigned long flags;
void (*freepage)(struct page *);
@@ -240,11 +237,11 @@ void delete_from_page_cache(struct page *page)
freepage = mapping->a_ops->freepage;
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
spin_lock_irqsave(&mapping->tree_lock, flags);
- __delete_from_page_cache(page, NULL, memcg);
+ __delete_from_page_cache(page, NULL);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
if (freepage)
freepage(page);
@@ -532,7 +529,6 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
if (!error) {
struct address_space *mapping = old->mapping;
void (*freepage)(struct page *);
- struct mem_cgroup *memcg;
unsigned long flags;
pgoff_t offset = old->index;
@@ -542,9 +538,9 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
new->mapping = mapping;
new->index = offset;
- memcg = lock_page_memcg(old);
+ lock_page_memcg(old);
spin_lock_irqsave(&mapping->tree_lock, flags);
- __delete_from_page_cache(old, NULL, memcg);
+ __delete_from_page_cache(old, NULL);
error = radix_tree_insert(&mapping->page_tree, offset, new);
BUG_ON(error);
mapping->nrpages++;
@@ -557,7 +553,7 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
if (PageSwapBacked(new))
__inc_zone_page_state(new, NR_SHMEM);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(old);
mem_cgroup_migrate(old, new);
radix_tree_preload_end();
if (freepage)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 64506b2eef34..3e4199830456 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1690,7 +1690,7 @@ cleanup:
* This function protects unlocked LRU pages from being moved to
* another cgroup and stabilizes their page->mem_cgroup binding.
*/
-struct mem_cgroup *lock_page_memcg(struct page *page)
+void lock_page_memcg(struct page *page)
{
struct mem_cgroup *memcg;
unsigned long flags;
@@ -1699,25 +1699,18 @@ struct mem_cgroup *lock_page_memcg(struct page *page)
* The RCU lock is held throughout the transaction. The fast
* path can get away without acquiring the memcg->move_lock
* because page moving starts with an RCU grace period.
- *
- * The RCU lock also protects the memcg from being freed when
- * the page state that is going to change is the only thing
- * preventing the page from being uncharged.
- * E.g. end-writeback clearing PageWriteback(), which allows
- * migration to go ahead and uncharge the page before the
- * account transaction might be complete.
*/
rcu_read_lock();
if (mem_cgroup_disabled())
- return NULL;
+ return;
again:
memcg = page->mem_cgroup;
if (unlikely(!memcg))
- return NULL;
+ return;
if (atomic_read(&memcg->moving_account) <= 0)
- return memcg;
+ return;
spin_lock_irqsave(&memcg->move_lock, flags);
if (memcg != page->mem_cgroup) {
@@ -1733,16 +1726,18 @@ again:
memcg->move_lock_task = current;
memcg->move_lock_flags = flags;
- return memcg;
+ return;
}
EXPORT_SYMBOL(lock_page_memcg);
/**
* unlock_page_memcg - unlock a page->mem_cgroup binding
- * @memcg: the memcg returned by lock_page_memcg()
+ * @page: the page
*/
-void unlock_page_memcg(struct mem_cgroup *memcg)
+void unlock_page_memcg(struct page *page)
{
+ struct mem_cgroup *memcg = page->mem_cgroup;
+
if (memcg && memcg->move_lock_task == current) {
unsigned long flags = memcg->move_lock_flags;
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 2b5ea1271e32..d7cf2c53d125 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2414,8 +2414,7 @@ int __set_page_dirty_no_writeback(struct page *page)
*
* NOTE: This relies on being atomic wrt interrupts.
*/
-void account_page_dirtied(struct page *page, struct address_space *mapping,
- struct mem_cgroup *memcg)
+void account_page_dirtied(struct page *page, struct address_space *mapping)
{
struct inode *inode = mapping->host;
@@ -2427,7 +2426,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping,
inode_attach_wb(inode, page);
wb = inode_to_wb(inode);
- mem_cgroup_inc_page_stat(memcg, MEM_CGROUP_STAT_DIRTY);
+ mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_DIRTY);
__inc_zone_page_state(page, NR_FILE_DIRTY);
__inc_zone_page_state(page, NR_DIRTIED);
__inc_wb_stat(wb, WB_RECLAIMABLE);
@@ -2445,10 +2444,10 @@ EXPORT_SYMBOL(account_page_dirtied);
* Caller must hold lock_page_memcg().
*/
void account_page_cleaned(struct page *page, struct address_space *mapping,
- struct mem_cgroup *memcg, struct bdi_writeback *wb)
+ struct bdi_writeback *wb)
{
if (mapping_cap_account_dirty(mapping)) {
- mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_DIRTY);
+ mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_DIRTY);
dec_zone_page_state(page, NR_FILE_DIRTY);
dec_wb_stat(wb, WB_RECLAIMABLE);
task_io_account_cancelled_write(PAGE_CACHE_SIZE);
@@ -2469,26 +2468,24 @@ void account_page_cleaned(struct page *page, struct address_space *mapping,
*/
int __set_page_dirty_nobuffers(struct page *page)
{
- struct mem_cgroup *memcg;
-
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
if (!TestSetPageDirty(page)) {
struct address_space *mapping = page_mapping(page);
unsigned long flags;
if (!mapping) {
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
return 1;
}
spin_lock_irqsave(&mapping->tree_lock, flags);
BUG_ON(page_mapping(page) != mapping);
WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
- account_page_dirtied(page, mapping, memcg);
+ account_page_dirtied(page, mapping);
radix_tree_tag_set(&mapping->page_tree, page_index(page),
PAGECACHE_TAG_DIRTY);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
if (mapping->host) {
/* !PageAnon && !swapper_space */
@@ -2496,7 +2493,7 @@ int __set_page_dirty_nobuffers(struct page *page)
}
return 1;
}
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
return 0;
}
EXPORT_SYMBOL(__set_page_dirty_nobuffers);
@@ -2626,17 +2623,16 @@ void cancel_dirty_page(struct page *page)
if (mapping_cap_account_dirty(mapping)) {
struct inode *inode = mapping->host;
struct bdi_writeback *wb;
- struct mem_cgroup *memcg;
bool locked;
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
wb = unlocked_inode_to_wb_begin(inode, &locked);
if (TestClearPageDirty(page))
- account_page_cleaned(page, mapping, memcg, wb);
+ account_page_cleaned(page, mapping, wb);
unlocked_inode_to_wb_end(inode, locked);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
} else {
ClearPageDirty(page);
}
@@ -2667,7 +2663,6 @@ int clear_page_dirty_for_io(struct page *page)
if (mapping && mapping_cap_account_dirty(mapping)) {
struct inode *inode = mapping->host;
struct bdi_writeback *wb;
- struct mem_cgroup *memcg;
bool locked;
/*
@@ -2705,16 +2700,16 @@ int clear_page_dirty_for_io(struct page *page)
* always locked coming in here, so we get the desired
* exclusion.
*/
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
wb = unlocked_inode_to_wb_begin(inode, &locked);
if (TestClearPageDirty(page)) {
- mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_DIRTY);
+ mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_DIRTY);
dec_zone_page_state(page, NR_FILE_DIRTY);
dec_wb_stat(wb, WB_RECLAIMABLE);
ret = 1;
}
unlocked_inode_to_wb_end(inode, locked);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
return ret;
}
return TestClearPageDirty(page);
@@ -2724,10 +2719,9 @@ EXPORT_SYMBOL(clear_page_dirty_for_io);
int test_clear_page_writeback(struct page *page)
{
struct address_space *mapping = page_mapping(page);
- struct mem_cgroup *memcg;
int ret;
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
if (mapping) {
struct inode *inode = mapping->host;
struct backing_dev_info *bdi = inode_to_bdi(inode);
@@ -2751,21 +2745,20 @@ int test_clear_page_writeback(struct page *page)
ret = TestClearPageWriteback(page);
}
if (ret) {
- mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_WRITEBACK);
+ mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_WRITEBACK);
dec_zone_page_state(page, NR_WRITEBACK);
inc_zone_page_state(page, NR_WRITTEN);
}
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
return ret;
}
int __test_set_page_writeback(struct page *page, bool keep_write)
{
struct address_space *mapping = page_mapping(page);
- struct mem_cgroup *memcg;
int ret;
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
if (mapping) {
struct inode *inode = mapping->host;
struct backing_dev_info *bdi = inode_to_bdi(inode);
@@ -2793,10 +2786,10 @@ int __test_set_page_writeback(struct page *page, bool keep_write)
ret = TestSetPageWriteback(page);
}
if (!ret) {
- mem_cgroup_inc_page_stat(memcg, MEM_CGROUP_STAT_WRITEBACK);
+ mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_WRITEBACK);
inc_zone_page_state(page, NR_WRITEBACK);
}
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
return ret;
}
diff --git a/mm/rmap.c b/mm/rmap.c
index 2871e7d3cced..02f0bfc3c80a 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1287,21 +1287,17 @@ void page_add_new_anon_rmap(struct page *page,
*/
void page_add_file_rmap(struct page *page)
{
- struct mem_cgroup *memcg;
-
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
if (atomic_inc_and_test(&page->_mapcount)) {
__inc_zone_page_state(page, NR_FILE_MAPPED);
- mem_cgroup_inc_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED);
+ mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
}
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
}
static void page_remove_file_rmap(struct page *page)
{
- struct mem_cgroup *memcg;
-
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
/* Hugepages are not counted in NR_FILE_MAPPED for now. */
if (unlikely(PageHuge(page))) {
@@ -1320,12 +1316,12 @@ static void page_remove_file_rmap(struct page *page)
* pte lock(a spinlock) is held, which implies preemption disabled.
*/
__dec_zone_page_state(page, NR_FILE_MAPPED);
- mem_cgroup_dec_page_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED);
+ mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
if (unlikely(PageMlocked(page)))
clear_page_mlock(page);
out:
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
}
static void page_remove_anon_compound_rmap(struct page *page)
diff --git a/mm/truncate.c b/mm/truncate.c
index 51a24f6a555d..87311af936f2 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -519,7 +519,6 @@ EXPORT_SYMBOL(invalidate_mapping_pages);
static int
invalidate_complete_page2(struct address_space *mapping, struct page *page)
{
- struct mem_cgroup *memcg;
unsigned long flags;
if (page->mapping != mapping)
@@ -528,15 +527,15 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
if (page_has_private(page) && !try_to_release_page(page, GFP_KERNEL))
return 0;
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
spin_lock_irqsave(&mapping->tree_lock, flags);
if (PageDirty(page))
goto failed;
BUG_ON(page_has_private(page));
- __delete_from_page_cache(page, NULL, memcg);
+ __delete_from_page_cache(page, NULL);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
if (mapping->a_ops->freepage)
mapping->a_ops->freepage(page);
@@ -545,7 +544,7 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
return 1;
failed:
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
return 0;
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9342a0fe8836..28e518d3c700 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -611,12 +611,11 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
bool reclaimed)
{
unsigned long flags;
- struct mem_cgroup *memcg;
BUG_ON(!PageLocked(page));
BUG_ON(mapping != page_mapping(page));
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
spin_lock_irqsave(&mapping->tree_lock, flags);
/*
* The non racy check for a busy page.
@@ -656,7 +655,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
mem_cgroup_swapout(page, swap);
__delete_from_swap_cache(page);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
swapcache_free(swap);
} else {
void (*freepage)(struct page *);
@@ -682,9 +681,9 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
if (reclaimed && page_is_file_cache(page) &&
!mapping_exiting(mapping) && !dax_mapping(mapping))
shadow = workingset_eviction(mapping, page);
- __delete_from_page_cache(page, shadow, memcg);
+ __delete_from_page_cache(page, shadow);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
if (freepage != NULL)
freepage(page);
@@ -694,7 +693,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
cannot_free:
spin_unlock_irqrestore(&mapping->tree_lock, flags);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
return 0;
}
diff --git a/mm/workingset.c b/mm/workingset.c
index 3ced3a2f8383..14522ed04869 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -305,10 +305,9 @@ bool workingset_refault(void *shadow)
*/
void workingset_activation(struct page *page)
{
- struct mem_cgroup *memcg;
struct lruvec *lruvec;
- memcg = lock_page_memcg(page);
+ lock_page_memcg(page);
/*
* Filter non-memcg pages here, e.g. unmap can call
* mark_page_accessed() on VDSO pages.
@@ -316,11 +315,11 @@ void workingset_activation(struct page *page)
* XXX: See workingset_refault() - this should return
* root_mem_cgroup even for !CONFIG_MEMCG.
*/
- if (!mem_cgroup_disabled() && !memcg)
+ if (!mem_cgroup_disabled() && !page_memcg(page))
return;
- lruvec = mem_cgroup_zone_lruvec(page_zone(page), memcg);
+ lruvec = mem_cgroup_zone_lruvec(page_zone(page), page_memcg(page));
atomic_long_inc(&lruvec->inactive_age);
- unlock_page_memcg(memcg);
+ unlock_page_memcg(page);
}
/*
--
2.7.0