Merge branch 'akpm' (patches from Andrew)

Merge more updates from Andrew Morton:

 - almost all of the rest of MM

 - kasan updates

 - lots of procfs work

 - misc things

 - lib/ updates

 - checkpatch

 - rapidio

 - ipc/shm updates

 - the start of willy's XArray conversion

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (140 commits)
  page cache: use xa_lock
  xarray: add the xa_lock to the radix_tree_root
  fscache: use appropriate radix tree accessors
  export __set_page_dirty
  unicore32: turn flush_dcache_mmap_lock into a no-op
  arm64: turn flush_dcache_mmap_lock into a no-op
  mac80211_hwsim: use DEFINE_IDA
  radix tree: use GFP_ZONEMASK bits of gfp_t for flags
  linux/const.h: refactor _BITUL and _BITULL a bit
  linux/const.h: move UL() macro to include/linux/const.h
  linux/const.h: prefix include guard of uapi/linux/const.h with _UAPI
  xen, mm: allow deferred page initialization for xen pv domains
  elf: enforce MAP_FIXED on overlaying elf segments
  fs, elf: drop MAP_FIXED usage from elf_map
  mm: introduce MAP_FIXED_NOREPLACE
  MAINTAINERS: update bouncing aacraid@adaptec.com addresses
  fs/dcache.c: add cond_resched() in shrink_dentry_list()
  include/linux/kfifo.h: fix comment
  ipc/shm.c: shm_split(): remove unneeded test for NULL shm_file_data.vm_ops
  kernel/sysctl.c: add kdoc comments to do_proc_do{u}intvec_minmax_conv_param
  ...

1 files changed, 21 insertions, 17 deletions

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index c46016bb25eb..d99b71bc2c66 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -48,13 +48,12 @@ enum memcg_stat_item {
 	MEMCG_NR_STAT,
 };
 
-/* Cgroup-specific events, on top of universal VM events */
-enum memcg_event_item {
-	MEMCG_LOW = NR_VM_EVENT_ITEMS,
+enum memcg_memory_event {
+	MEMCG_LOW,
 	MEMCG_HIGH,
 	MEMCG_MAX,
 	MEMCG_OOM,
-	MEMCG_NR_EVENTS,
+	MEMCG_NR_MEMORY_EVENTS,
 };
 
 struct mem_cgroup_reclaim_cookie {
@@ -88,7 +87,7 @@ enum mem_cgroup_events_target {
 
 struct mem_cgroup_stat_cpu {
 	long count[MEMCG_NR_STAT];
-	unsigned long events[MEMCG_NR_EVENTS];
+	unsigned long events[NR_VM_EVENT_ITEMS];
 	unsigned long nr_page_events;
 	unsigned long targets[MEM_CGROUP_NTARGETS];
 };
@@ -120,6 +119,9 @@ struct mem_cgroup_per_node {
 	unsigned long		usage_in_excess;/* Set to the value by which */
 						/* the soft limit is exceeded*/
 	bool			on_tree;
+	bool			congested;	/* memcg has many dirty pages */
+						/* backed by a congested BDI */
+
 	struct mem_cgroup	*memcg;		/* Back pointer, we cannot */
 						/* use container_of	   */
 };
@@ -202,7 +204,8 @@ struct mem_cgroup {
 	/* OOM-Killer disable */
 	int		oom_kill_disable;
 
-	/* handle for "memory.events" */
+	/* memory.events */
+	atomic_long_t memory_events[MEMCG_NR_MEMORY_EVENTS];
 	struct cgroup_file events_file;
 
 	/* protect arrays of thresholds */
@@ -231,9 +234,10 @@ struct mem_cgroup {
 	struct task_struct	*move_lock_task;
 	unsigned long		move_lock_flags;
 
+	/* memory.stat */
 	struct mem_cgroup_stat_cpu __percpu *stat_cpu;
 	atomic_long_t		stat[MEMCG_NR_STAT];
-	atomic_long_t		events[MEMCG_NR_EVENTS];
+	atomic_long_t		events[NR_VM_EVENT_ITEMS];
 
 	unsigned long		socket_pressure;
 
@@ -645,9 +649,9 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
 						gfp_t gfp_mask,
 						unsigned long *total_scanned);
 
-/* idx can be of type enum memcg_event_item or vm_event_item */
 static inline void __count_memcg_events(struct mem_cgroup *memcg,
-					int idx, unsigned long count)
+					enum vm_event_item idx,
+					unsigned long count)
 {
 	unsigned long x;
 
@@ -663,7 +667,8 @@ static inline void __count_memcg_events(struct mem_cgroup *memcg,
 }
 
 static inline void count_memcg_events(struct mem_cgroup *memcg,
-				      int idx, unsigned long count)
+				      enum vm_event_item idx,
+				      unsigned long count)
 {
 	unsigned long flags;
 
@@ -672,9 +677,8 @@ static inline void count_memcg_events(struct mem_cgroup *memcg,
 	local_irq_restore(flags);
 }
 
-/* idx can be of type enum memcg_event_item or vm_event_item */
 static inline void count_memcg_page_event(struct page *page,
-					  int idx)
+					  enum vm_event_item idx)
 {
 	if (page->mem_cgroup)
 		count_memcg_events(page->mem_cgroup, idx, 1);
@@ -698,10 +702,10 @@ static inline void count_memcg_event_mm(struct mm_struct *mm,
 	rcu_read_unlock();
 }
 
-static inline void mem_cgroup_event(struct mem_cgroup *memcg,
-				    enum memcg_event_item event)
+static inline void memcg_memory_event(struct mem_cgroup *memcg,
+				      enum memcg_memory_event event)
 {
-	count_memcg_events(memcg, event, 1);
+	atomic_long_inc(&memcg->memory_events[event]);
 	cgroup_file_notify(&memcg->events_file);
 }
 
@@ -721,8 +725,8 @@ static inline bool mem_cgroup_disabled(void)
 	return true;
 }
 
-static inline void mem_cgroup_event(struct mem_cgroup *memcg,
-				    enum memcg_event_item event)
+static inline void memcg_memory_event(struct mem_cgroup *memcg,
+				      enum memcg_memory_event event)
 {
 }