Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton: - a few misc things - a few Y2038 fixes - ntfs fixes - arch/sh tweaks - ocfs2 updates - most of MM * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (111 commits) mm/hmm.c: remove unused variables align_start and align_end fs/userfaultfd.c: remove redundant pointer uwq mm, vmacache: hash addresses based on pmd mm/list_lru: introduce list_lru_shrink_walk_irq() mm/list_lru.c: pass struct list_lru_node* as an argument to __list_lru_walk_one() mm/list_lru.c: move locking from __list_lru_walk_one() to its caller mm/list_lru.c: use list_lru_walk_one() in list_lru_walk_node() mm, swap: make CONFIG_THP_SWAP depend on CONFIG_SWAP mm/sparse: delete old sparse_init and enable new one mm/sparse: add new sparse_init_nid() and sparse_init() mm/sparse: move buffer init/fini to the common place mm/sparse: use the new sparse buffer functions in non-vmemmap mm/sparse: abstract sparse buffer allocations mm/hugetlb.c: don't zero 1GiB bootmem pages mm, page_alloc: double zone's batchsize mm/oom_kill.c: document oom_lock mm/hugetlb: remove gigantic page support for HIGHMEM mm, oom: remove sleep from under oom_lock kernel/dma: remove unsupported gfp_mask parameter from dma_alloc_from_contiguous() mm/cma: remove unsupported gfp_mask parameter from cma_alloc() ...
2018-08-17 16:49:31 -07:00
parent 9bd553929f 1e92641929
commit 6ada4e2826
152 changed files with 2134 additions and 1177 deletions
--- a/include/linux/bitfield.h
+++ b/include/linux/bitfield.h
@@ -53,7 +53,7 @@
 	({								\
 		BUILD_BUG_ON_MSG(!__builtin_constant_p(_mask),		\
 				 _pfx "mask is not constant");		\
-		BUILD_BUG_ON_MSG(!(_mask), _pfx "mask is zero");	\
+		BUILD_BUG_ON_MSG((_mask) == 0, _pfx "mask is zero");	\
 		BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ?		\
 				 ~((_mask) >> __bf_shf(_mask)) & (_val) : 0, \
 				 _pfx "value too large for the field"); \
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -33,7 +33,7 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
 					const char *name,
 					struct cma **res_cma);
 extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
-			      gfp_t gfp_mask);
+			      bool no_warn);
 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);

 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
--- a/include/linux/dma-contiguous.h
+++ b/include/linux/dma-contiguous.h
@@ -112,7 +112,7 @@ static inline int dma_declare_contiguous(struct device *dev, phys_addr_t size,
 }

 struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
-				       unsigned int order, gfp_t gfp_mask);
+				       unsigned int order, bool no_warn);
 bool dma_release_from_contiguous(struct device *dev, struct page *pages,
 				 int count);

@@ -145,7 +145,7 @@ int dma_declare_contiguous(struct device *dev, phys_addr_t size,

 static inline
 struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
-				       unsigned int order, gfp_t gfp_mask)
+				       unsigned int order, bool no_warn)
 {
 	return NULL;
 }
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -179,7 +179,6 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
 #define ATTR_ATIME_SET	(1 << 7)
 #define ATTR_MTIME_SET	(1 << 8)
 #define ATTR_FORCE	(1 << 9) /* Not a change, but a change it */
-#define ATTR_ATTR_FLAG	(1 << 10)
 #define ATTR_KILL_SUID	(1 << 11)
 #define ATTR_KILL_SGID	(1 << 12)
 #define ATTR_FILE	(1 << 13)
@@ -345,6 +344,10 @@ struct address_space_operations {
 	/* Set a page dirty.  Return true if this dirtied it */
 	int (*set_page_dirty)(struct page *page);

+	/*
+	 * Reads in the requested pages. Unlike ->readpage(), this is
+	 * PURELY used for read-ahead!.
+	 */
 	int (*readpages)(struct file *filp, struct address_space *mapping,
 			struct list_head *pages, unsigned nr_pages);

--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -84,6 +84,8 @@ struct fsnotify_event_private_data;
 struct fsnotify_fname;
 struct fsnotify_iter_info;

+struct mem_cgroup;
+
 /*
 * Each group much define these ops.  The fsnotify infrastructure will call
 * these operations for each relevant group.
@@ -127,6 +129,8 @@ struct fsnotify_event {
 * everything will be cleaned up.
 */
 struct fsnotify_group {
+	const struct fsnotify_ops *ops;	/* how this group handles things */
+
 	/*
 	 * How the refcnt is used is up to each group.  When the refcnt hits 0
 	 * fsnotify will clean up all of the resources associated with this group.
@@ -137,8 +141,6 @@ struct fsnotify_group {
 	 */
 	refcount_t refcnt;		/* things with interest in this group */

-	const struct fsnotify_ops *ops;	/* how this group handles things */
-
 	/* needed to send notification to userspace */
 	spinlock_t notification_lock;		/* protect the notification_list */
 	struct list_head notification_list;	/* list of event_holder this group needs to send to userspace */
@@ -160,6 +162,8 @@ struct fsnotify_group {
 	atomic_t num_marks;		/* 1 for each mark and 1 for not being
 					 * past the point of no return when freeing
 					 * a group */
+	atomic_t user_waits;		/* Number of tasks waiting for user
+					 * response */
 	struct list_head marks_list;	/* all inode marks for this group */

 	struct fasync_struct *fsn_fa;    /* async notification */
@@ -167,8 +171,8 @@ struct fsnotify_group {
 	struct fsnotify_event *overflow_event;	/* Event we queue when the
 						 * notification list is too
 						 * full */
-	atomic_t user_waits;		/* Number of tasks waiting for user
-					 * response */
+
+	struct mem_cgroup *memcg;	/* memcg to charge allocations */

 	/* groups can define private fields here or use the void *private */
 	union {
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -348,9 +348,6 @@ struct hstate {
 struct huge_bootmem_page {
 	struct list_head list;
 	struct hstate *hstate;
-#ifdef CONFIG_HIGHMEM
-	phys_addr_t phys;
-#endif
 };

 struct page *alloc_huge_page(struct vm_area_struct *vma,
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -20,7 +20,7 @@ extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
 extern pud_t kasan_zero_pud[PTRS_PER_PUD];
 extern p4d_t kasan_zero_p4d[MAX_PTRS_PER_P4D];

-void kasan_populate_zero_shadow(const void *shadow_start,
+int kasan_populate_zero_shadow(const void *shadow_start,
 				const void *shadow_end);

 static inline void *kasan_mem_to_shadow(const void *addr)
@@ -71,6 +71,9 @@ struct kasan_cache {
 int kasan_module_alloc(void *addr, size_t size);
 void kasan_free_shadow(const struct vm_struct *vm);

+int kasan_add_zero_shadow(void *start, unsigned long size);
+void kasan_remove_zero_shadow(void *start, unsigned long size);
+
 size_t ksize(const void *);
 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
 size_t kasan_metadata_size(struct kmem_cache *cache);
@@ -124,6 +127,14 @@ static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
 static inline void kasan_free_shadow(const struct vm_struct *vm) {}

+static inline int kasan_add_zero_shadow(void *start, unsigned long size)
+{
+	return 0;
+}
+static inline void kasan_remove_zero_shadow(void *start,
+					unsigned long size)
+{}
+
 static inline void kasan_unpoison_slab(const void *ptr) { }
 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }

--- a/include/linux/list_lru.h
+++ b/include/linux/list_lru.h
@@ -42,7 +42,7 @@ struct list_lru_node {
 	spinlock_t		lock;
 	/* global list, used for the root cgroup in cgroup aware lrus */
 	struct list_lru_one	lru;
-#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
+#ifdef CONFIG_MEMCG_KMEM
 	/* for cgroup aware lrus points to per cgroup lists, otherwise NULL */
 	struct list_lru_memcg	__rcu *memcg_lrus;
 #endif
@@ -51,21 +51,25 @@ struct list_lru_node {

 struct list_lru {
 	struct list_lru_node	*node;
-#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
+#ifdef CONFIG_MEMCG_KMEM
 	struct list_head	list;
+	int			shrinker_id;
 #endif
 };

 void list_lru_destroy(struct list_lru *lru);
 int __list_lru_init(struct list_lru *lru, bool memcg_aware,
-		    struct lock_class_key *key);
+		    struct lock_class_key *key, struct shrinker *shrinker);

-#define list_lru_init(lru)		__list_lru_init((lru), false, NULL)
-#define list_lru_init_key(lru, key)	__list_lru_init((lru), false, (key))
-#define list_lru_init_memcg(lru)	__list_lru_init((lru), true, NULL)
+#define list_lru_init(lru)				\
+	__list_lru_init((lru), false, NULL, NULL)
+#define list_lru_init_key(lru, key)			\
+	__list_lru_init((lru), false, (key), NULL)
+#define list_lru_init_memcg(lru, shrinker)		\
+	__list_lru_init((lru), true, NULL, shrinker)

 int memcg_update_all_list_lrus(int num_memcgs);
-void memcg_drain_all_list_lrus(int src_idx, int dst_idx);
+void memcg_drain_all_list_lrus(int src_idx, struct mem_cgroup *dst_memcg);

 /**
 * list_lru_add: add an element to the lru list's tail
@@ -162,6 +166,23 @@ unsigned long list_lru_walk_one(struct list_lru *lru,
 				int nid, struct mem_cgroup *memcg,
 				list_lru_walk_cb isolate, void *cb_arg,
 				unsigned long *nr_to_walk);
+/**
+ * list_lru_walk_one_irq: walk a list_lru, isolating and disposing freeable items.
+ * @lru: the lru pointer.
+ * @nid: the node id to scan from.
+ * @memcg: the cgroup to scan from.
+ * @isolate: callback function that is resposible for deciding what to do with
+ *  the item currently being scanned
+ * @cb_arg: opaque type that will be passed to @isolate
+ * @nr_to_walk: how many items to scan.
+ *
+ * Same as @list_lru_walk_one except that the spinlock is acquired with
+ * spin_lock_irq().
+ */
+unsigned long list_lru_walk_one_irq(struct list_lru *lru,
+				    int nid, struct mem_cgroup *memcg,
+				    list_lru_walk_cb isolate, void *cb_arg,
+				    unsigned long *nr_to_walk);
 unsigned long list_lru_walk_node(struct list_lru *lru, int nid,
 				 list_lru_walk_cb isolate, void *cb_arg,
 				 unsigned long *nr_to_walk);
@@ -174,6 +195,14 @@ list_lru_shrink_walk(struct list_lru *lru, struct shrink_control *sc,
 				 &sc->nr_to_scan);
 }

+static inline unsigned long
+list_lru_shrink_walk_irq(struct list_lru *lru, struct shrink_control *sc,
+			 list_lru_walk_cb isolate, void *cb_arg)
+{
+	return list_lru_walk_one_irq(lru, sc->nid, sc->memcg, isolate, cb_arg,
+				     &sc->nr_to_scan);
+}
+
 static inline unsigned long
 list_lru_walk(struct list_lru *lru, list_lru_walk_cb isolate,
 	      void *cb_arg, unsigned long nr_to_walk)
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -111,6 +111,15 @@ struct lruvec_stat {
 	long count[NR_VM_NODE_STAT_ITEMS];
 };

+/*
+ * Bitmap of shrinker::id corresponding to memcg-aware shrinkers,
+ * which have elements charged to this memcg.
+ */
+struct memcg_shrinker_map {
+	struct rcu_head rcu;
+	unsigned long map[0];
+};
+
 /*
 * per-zone information in memory controller.
 */
@@ -124,6 +133,9 @@ struct mem_cgroup_per_node {

 	struct mem_cgroup_reclaim_iter	iter[DEF_PRIORITY + 1];

+#ifdef CONFIG_MEMCG_KMEM
+	struct memcg_shrinker_map __rcu	*shrinker_map;
+#endif
 	struct rb_node		tree_node;	/* RB tree node */
 	unsigned long		usage_in_excess;/* Set to the value by which */
 						/* the soft limit is exceeded*/
@@ -271,7 +283,7 @@ struct mem_cgroup {
 	bool			tcpmem_active;
 	int			tcpmem_pressure;

-#ifndef CONFIG_SLOB
+#ifdef CONFIG_MEMCG_KMEM
        /* Index in the kmem_cache->memcg_params.memcg_caches array */
 	int kmemcg_id;
 	enum memcg_kmem_state kmem_state;
@@ -306,6 +318,11 @@ struct mem_cgroup {

 extern struct mem_cgroup *root_mem_cgroup;

+static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
+{
+	return (memcg == root_mem_cgroup);
+}
+
 static inline bool mem_cgroup_disabled(void)
 {
 	return !cgroup_subsys_enabled(memory_cgrp_subsys);
@@ -373,11 +390,21 @@ struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
 bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);

+struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm);
+
+struct mem_cgroup *get_mem_cgroup_from_page(struct page *page);
+
 static inline
 struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
 	return css ? container_of(css, struct mem_cgroup, css) : NULL;
 }

+static inline void mem_cgroup_put(struct mem_cgroup *memcg)
+{
+	if (memcg)
+		css_put(&memcg->css);
+}
+
 #define mem_cgroup_from_counter(counter, member)	\
 	container_of(counter, struct mem_cgroup, member)

@@ -497,16 +524,16 @@ unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg);
 void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 				struct task_struct *p);

-static inline void mem_cgroup_oom_enable(void)
+static inline void mem_cgroup_enter_user_fault(void)
 {
-	WARN_ON(current->memcg_may_oom);
-	current->memcg_may_oom = 1;
+	WARN_ON(current->in_user_fault);
+	current->in_user_fault = 1;
 }

-static inline void mem_cgroup_oom_disable(void)
+static inline void mem_cgroup_exit_user_fault(void)
 {
-	WARN_ON(!current->memcg_may_oom);
-	current->memcg_may_oom = 0;
+	WARN_ON(!current->in_user_fault);
+	current->in_user_fault = 0;
 }

 static inline bool task_in_memcg_oom(struct task_struct *p)
@@ -762,6 +789,11 @@ void mem_cgroup_split_huge_fixup(struct page *head);

 struct mem_cgroup;

+static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
+{
+	return true;
+}
+
 static inline bool mem_cgroup_disabled(void)
 {
 	return true;
@@ -850,6 +882,20 @@ static inline bool task_in_mem_cgroup(struct task_struct *task,
 	return true;
 }

+static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
+{
+	return NULL;
+}
+
+static inline struct mem_cgroup *get_mem_cgroup_from_page(struct page *page)
+{
+	return NULL;
+}
+
+static inline void mem_cgroup_put(struct mem_cgroup *memcg)
+{
+}
+
 static inline struct mem_cgroup *
 mem_cgroup_iter(struct mem_cgroup *root,
 		struct mem_cgroup *prev,
@@ -937,11 +983,11 @@ static inline void mem_cgroup_handle_over_high(void)
 {
 }

-static inline void mem_cgroup_oom_enable(void)
+static inline void mem_cgroup_enter_user_fault(void)
 {
 }

-static inline void mem_cgroup_oom_disable(void)
+static inline void mem_cgroup_exit_user_fault(void)
 {
 }

@@ -1207,7 +1253,7 @@ int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
 int memcg_kmem_charge(struct page *page, gfp_t gfp, int order);
 void memcg_kmem_uncharge(struct page *page, int order);

-#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
+#ifdef CONFIG_MEMCG_KMEM
 extern struct static_key_false memcg_kmem_enabled_key;
 extern struct workqueue_struct *memcg_kmem_cache_wq;

@@ -1238,6 +1284,10 @@ static inline int memcg_cache_id(struct mem_cgroup *memcg)
 	return memcg ? memcg->kmemcg_id : -1;
 }

+extern int memcg_expand_shrinker_maps(int new_id);
+
+extern void memcg_set_shrinker_bit(struct mem_cgroup *memcg,
+				   int nid, int shrinker_id);
 #else
 #define for_each_memcg_cache_index(_idx)	\
 	for (; NULL; )
@@ -1260,6 +1310,8 @@ static inline void memcg_put_cache_ids(void)
 {
 }

-#endif /* CONFIG_MEMCG && !CONFIG_SLOB */
+static inline void memcg_set_shrinker_bit(struct mem_cgroup *memcg,
+					  int nid, int shrinker_id) { }
+#endif /* CONFIG_MEMCG_KMEM */

 #endif /* _LINUX_MEMCONTROL_H */
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2665,12 +2665,7 @@ extern int randomize_va_space;
 const char * arch_vma_name(struct vm_area_struct *vma);
 void print_vma_addr(char *prefix, unsigned long rip);

-void sparse_mem_maps_populate_node(struct page **map_map,
-				   unsigned long pnum_begin,
-				   unsigned long pnum_end,
-				   unsigned long map_count,
-				   int nodeid);
-
+void *sparse_buffer_alloc(unsigned long size);
 struct page *sparse_mem_map_populate(unsigned long pnum, int nid,
 		struct vmem_altmap *altmap);
 pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
@@ -2752,7 +2747,8 @@ extern void clear_huge_page(struct page *page,
 			    unsigned long addr_hint,
 			    unsigned int pages_per_huge_page);
 extern void copy_user_huge_page(struct page *dst, struct page *src,
-				unsigned long addr, struct vm_area_struct *vma,
+				unsigned long addr_hint,
+				struct vm_area_struct *vma,
 				unsigned int pages_per_huge_page);
 extern long copy_huge_page_from_user(struct page *dst_page,
 				const void __user *usr_src,
--- a/include/linux/node.h
+++ b/include/linux/node.h
@@ -33,10 +33,10 @@ typedef  void (*node_registration_func_t)(struct node *);

 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
 extern int link_mem_sections(int nid, unsigned long start_pfn,
-			     unsigned long nr_pages, bool check_nid);
+			     unsigned long end_pfn);
 #else
 static inline int link_mem_sections(int nid, unsigned long start_pfn,
-				    unsigned long nr_pages, bool check_nid)
+				    unsigned long end_pfn)
 {
 	return 0;
 }
@@ -54,12 +54,14 @@ static inline int register_one_node(int nid)

 	if (node_online(nid)) {
 		struct pglist_data *pgdat = NODE_DATA(nid);
+		unsigned long start_pfn = pgdat->node_start_pfn;
+		unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;

 		error = __register_one_node(nid);
 		if (error)
 			return error;
 		/* link memory sections under this node */
-		error = link_mem_sections(nid, pgdat->node_start_pfn, pgdat->node_spanned_pages, true);
+		error = link_mem_sections(nid, start_pfn, end_pfn);
 	}

 	return error;
@@ -69,7 +71,7 @@ extern void unregister_one_node(int nid);
 extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
 extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
 extern int register_mem_sect_under_node(struct memory_block *mem_blk,
-						int nid, bool check_nid);
+						void *arg);
 extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
 					   unsigned long phys_index);

@@ -99,7 +101,7 @@ static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 	return 0;
 }
 static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
-							int nid, bool check_nid)
+							void *arg)
 {
 	return 0;
 }
--- a/include/linux/page_ext.h
+++ b/include/linux/page_ext.h
@@ -16,18 +16,7 @@ struct page_ext_operations {

 #ifdef CONFIG_PAGE_EXTENSION

-/*
- * page_ext->flags bits:
- *
- * PAGE_EXT_DEBUG_POISON is set for poisoned pages. This is used to
- * implement generic debug pagealloc feature. The pages are filled with
- * poison patterns and set this flag after free_pages(). The poisoned
- * pages are verified whether the patterns are not corrupted and clear
- * the flag before alloc_pages().
- */
-
 enum page_ext_flags {
-	PAGE_EXT_DEBUG_POISON,		/* Page is poisoned */
 	PAGE_EXT_DEBUG_GUARD,
 	PAGE_EXT_OWNER,
 #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
@@ -61,7 +50,7 @@ static inline void page_ext_init(void)
 }
 #endif

-struct page_ext *lookup_page_ext(struct page *page);
+struct page_ext *lookup_page_ext(const struct page *page);

 #else /* !CONFIG_PAGE_EXTENSION */
 struct page_ext;
@@ -70,7 +59,7 @@ static inline void pgdat_page_ext_init(struct pglist_data *pgdat)
 {
 }

-static inline struct page_ext *lookup_page_ext(struct page *page)
+static inline struct page_ext *lookup_page_ext(const struct page *page)
 {
 	return NULL;
 }
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -722,8 +722,8 @@ struct task_struct {
 	unsigned			restore_sigmask:1;
 #endif
 #ifdef CONFIG_MEMCG
-	unsigned			memcg_may_oom:1;
-#ifndef CONFIG_SLOB
+	unsigned			in_user_fault:1;
+#ifdef CONFIG_MEMCG_KMEM
 	unsigned			memcg_kmem_skip_account:1;
 #endif
 #endif
@@ -1152,6 +1152,9 @@ struct task_struct {

 	/* Number of pages to reclaim on returning to userland: */
 	unsigned int			memcg_nr_pages_over_high;
+
+	/* Used by memcontrol for targeted memcg charge: */
+	struct mem_cgroup		*active_memcg;
 #endif

 #ifdef CONFIG_BLK_CGROUP
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -248,6 +248,43 @@ static inline void memalloc_noreclaim_restore(unsigned int flags)
 	current->flags = (current->flags & ~PF_MEMALLOC) | flags;
 }

+#ifdef CONFIG_MEMCG
+/**
+ * memalloc_use_memcg - Starts the remote memcg charging scope.
+ * @memcg: memcg to charge.
+ *
+ * This function marks the beginning of the remote memcg charging scope. All the
+ * __GFP_ACCOUNT allocations till the end of the scope will be charged to the
+ * given memcg.
+ *
+ * NOTE: This function is not nesting safe.
+ */
+static inline void memalloc_use_memcg(struct mem_cgroup *memcg)
+{
+	WARN_ON_ONCE(current->active_memcg);
+	current->active_memcg = memcg;
+}
+
+/**
+ * memalloc_unuse_memcg - Ends the remote memcg charging scope.
+ *
+ * This function marks the end of the remote memcg charging scope started by
+ * memalloc_use_memcg().
+ */
+static inline void memalloc_unuse_memcg(void)
+{
+	current->active_memcg = NULL;
+}
+#else
+static inline void memalloc_use_memcg(struct mem_cgroup *memcg)
+{
+}
+
+static inline void memalloc_unuse_memcg(void)
+{
+}
+#endif
+
 #ifdef CONFIG_MEMBARRIER
 enum {
 	MEMBARRIER_STATE_PRIVATE_EXPEDITED_READY		= (1U << 0),
--- a/include/linux/shrinker.h
+++ b/include/linux/shrinker.h
@@ -34,12 +34,15 @@ struct shrink_control {
 };

 #define SHRINK_STOP (~0UL)
+#define SHRINK_EMPTY (~0UL - 1)
 /*
 * A callback you can register to apply pressure to ageable caches.
 *
 * @count_objects should return the number of freeable items in the cache. If
- * there are no objects to free or the number of freeable items cannot be
- * determined, it should return 0. No deadlock checks should be done during the
+ * there are no objects to free, it should return SHRINK_EMPTY, while 0 is
+ * returned in cases of the number of freeable items cannot be determined
+ * or shrinker should skip this cache for this time (e.g., their number
+ * is below shrinkable limit). No deadlock checks should be done during the
 * count callback - the shrinker relies on aggregating scan counts that couldn't
 * be executed due to potential deadlocks to be run at a later call when the
 * deadlock condition is no longer pending.
@@ -66,6 +69,10 @@ struct shrinker {

 	/* These are for internal use */
 	struct list_head list;
+#ifdef CONFIG_MEMCG_KMEM
+	/* ID in shrinker_idr */
+	int id;
+#endif
 	/* objs pending delete, per node */
 	atomic_long_t *nr_deferred;
 };
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -97,7 +97,7 @@
 # define SLAB_FAILSLAB		0
 #endif
 /* Account to memcg */
-#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
+#ifdef CONFIG_MEMCG_KMEM
 # define SLAB_ACCOUNT		((slab_flags_t __force)0x04000000U)
 #else
 # define SLAB_ACCOUNT		0
--- a/include/linux/vmacache.h
+++ b/include/linux/vmacache.h
@@ -5,12 +5,6 @@
 #include <linux/sched.h>
 #include <linux/mm.h>

-/*
- * Hash based on the page number. Provides a good hit rate for
- * workloads with good locality and those with random accesses as well.
- */
-#define VMACACHE_HASH(addr) ((addr >> PAGE_SHIFT) & VMACACHE_MASK)
-
 static inline void vmacache_flush(struct task_struct *tsk)
 {
 	memset(tsk->vmacache.vmas, 0, sizeof(tsk->vmacache.vmas));