diff options
Diffstat (limited to 'mm/slab.h')
| -rw-r--r-- | mm/slab.h | 939 |
1 files changed, 459 insertions, 480 deletions
diff --git a/mm/slab.h b/mm/slab.h index 207c83ef6e06..f730e012553c 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -1,114 +1,326 @@ /* SPDX-License-Identifier: GPL-2.0 */ #ifndef MM_SLAB_H #define MM_SLAB_H -/* - * Internal slab definitions - */ -#ifdef CONFIG_SLOB +#include <linux/reciprocal_div.h> +#include <linux/list_lru.h> +#include <linux/local_lock.h> +#include <linux/random.h> +#include <linux/kobject.h> +#include <linux/sched/mm.h> +#include <linux/memcontrol.h> +#include <linux/kfence.h> +#include <linux/kasan.h> + /* - * Common fields provided in kmem_cache by all slab allocators - * This struct is either used directly by the allocator (SLOB) - * or the allocator must include definitions for all fields - * provided in kmem_cache_common in their definition of kmem_cache. - * - * Once we can do anonymous structs (C11 standard) we could put a - * anonymous struct definition in these allocators so that the - * separate allocations in the kmem_cache structure of SLAB and - * SLUB is no longer needed. + * Internal slab definitions */ -struct kmem_cache { - unsigned int object_size;/* The original size of the object */ - unsigned int size; /* The aligned/padded/added on size */ - unsigned int align; /* Alignment as calculated */ - slab_flags_t flags; /* Active flags on the slab */ - unsigned int useroffset;/* Usercopy region offset */ - unsigned int usersize; /* Usercopy region size */ - const char *name; /* Slab name for sysfs */ - int refcount; /* Use counter */ - void (*ctor)(void *); /* Called on object slot creation */ - struct list_head list; /* List of all slab caches on the system */ -}; -#else /* !CONFIG_SLOB */ +#ifdef CONFIG_64BIT +# ifdef system_has_cmpxchg128 +# define system_has_freelist_aba() system_has_cmpxchg128() +# define try_cmpxchg_freelist try_cmpxchg128 +# endif +#define this_cpu_try_cmpxchg_freelist this_cpu_try_cmpxchg128 +typedef u128 freelist_full_t; +#else /* CONFIG_64BIT */ +# ifdef system_has_cmpxchg64 +# define system_has_freelist_aba() system_has_cmpxchg64() +# define try_cmpxchg_freelist try_cmpxchg64 +# endif +#define this_cpu_try_cmpxchg_freelist this_cpu_try_cmpxchg64 +typedef u64 freelist_full_t; +#endif /* CONFIG_64BIT */ -struct memcg_cache_array { - struct rcu_head rcu; - struct kmem_cache *entries[0]; -}; +#if defined(system_has_freelist_aba) && !defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE) +#undef system_has_freelist_aba +#endif /* - * This is the main placeholder for memcg-related information in kmem caches. - * Both the root cache and the child caches will have it. For the root cache, - * this will hold a dynamically allocated array large enough to hold - * information about the currently limited memcgs in the system. To allow the - * array to be accessed without taking any locks, on relocation we free the old - * version only after a grace period. - * - * Root and child caches hold different metadata. - * - * @root_cache: Common to root and child caches. NULL for root, pointer to - * the root cache for children. - * - * The following fields are specific to root caches. - * - * @memcg_caches: kmemcg ID indexed table of child caches. This table is - * used to index child cachces during allocation and cleared - * early during shutdown. - * - * @root_caches_node: List node for slab_root_caches list. - * - * @children: List of all child caches. While the child caches are also - * reachable through @memcg_caches, a child cache remains on - * this list until it is actually destroyed. - * - * The following fields are specific to child caches. - * - * @memcg: Pointer to the memcg this cache belongs to. - * - * @children_node: List node for @root_cache->children list. - * - * @kmem_caches_node: List node for @memcg->kmem_caches list. + * Freelist pointer and counter to cmpxchg together, avoids the typical ABA + * problems with cmpxchg of just a pointer. */ -struct memcg_cache_params { - struct kmem_cache *root_cache; +struct freelist_counters { union { struct { - struct memcg_cache_array __rcu *memcg_caches; - struct list_head __root_caches_node; - struct list_head children; - bool dying; + void *freelist; + union { + unsigned long counters; + struct { + unsigned inuse:16; + unsigned objects:15; + /* + * If slab debugging is enabled then the + * frozen bit can be reused to indicate + * that the slab was corrupted + */ + unsigned frozen:1; + }; + }; }; - struct { - struct mem_cgroup *memcg; - struct list_head children_node; - struct list_head kmem_caches_node; - struct percpu_ref refcnt; +#ifdef system_has_freelist_aba + freelist_full_t freelist_counters; +#endif + }; +}; + +/* Reuses the bits in struct page */ +struct slab { + memdesc_flags_t flags; - void (*work_fn)(struct kmem_cache *); + struct kmem_cache *slab_cache; + union { + struct { union { - struct rcu_head rcu_head; - struct work_struct work; + struct list_head slab_list; + struct { /* For deferred deactivate_slab() */ + struct llist_node llnode; + void *flush_freelist; + }; +#ifdef CONFIG_SLUB_CPU_PARTIAL + struct { + struct slab *next; + int slabs; /* Nr of slabs left */ + }; +#endif }; + /* Double-word boundary */ + struct freelist_counters; }; + struct rcu_head rcu_head; }; + + unsigned int __page_type; + atomic_t __page_refcount; +#ifdef CONFIG_SLAB_OBJ_EXT + unsigned long obj_exts; +#endif }; -#endif /* CONFIG_SLOB */ -#ifdef CONFIG_SLAB -#include <linux/slab_def.h> +#define SLAB_MATCH(pg, sl) \ + static_assert(offsetof(struct page, pg) == offsetof(struct slab, sl)) +SLAB_MATCH(flags, flags); +SLAB_MATCH(compound_head, slab_cache); /* Ensure bit 0 is clear */ +SLAB_MATCH(_refcount, __page_refcount); +#ifdef CONFIG_MEMCG +SLAB_MATCH(memcg_data, obj_exts); +#elif defined(CONFIG_SLAB_OBJ_EXT) +SLAB_MATCH(_unused_slab_obj_exts, obj_exts); #endif +#undef SLAB_MATCH +static_assert(sizeof(struct slab) <= sizeof(struct page)); +#if defined(system_has_freelist_aba) +static_assert(IS_ALIGNED(offsetof(struct slab, freelist), sizeof(struct freelist_counters))); +#endif + +/** + * slab_folio - The folio allocated for a slab + * @s: The slab. + * + * Slabs are allocated as folios that contain the individual objects and are + * using some fields in the first struct page of the folio - those fields are + * now accessed by struct slab. It is occasionally necessary to convert back to + * a folio in order to communicate with the rest of the mm. Please use this + * helper function instead of casting yourself, as the implementation may change + * in the future. + */ +#define slab_folio(s) (_Generic((s), \ + const struct slab *: (const struct folio *)s, \ + struct slab *: (struct folio *)s)) + +/** + * page_slab - Converts from struct page to its slab. + * @page: A page which may or may not belong to a slab. + * + * Return: The slab which contains this page or NULL if the page does + * not belong to a slab. This includes pages returned from large kmalloc. + */ +static inline struct slab *page_slab(const struct page *page) +{ + unsigned long head; + + head = READ_ONCE(page->compound_head); + if (head & 1) + page = (struct page *)(head - 1); + if (data_race(page->page_type >> 24) != PGTY_slab) + page = NULL; + + return (struct slab *)page; +} + +/** + * slab_page - The first struct page allocated for a slab + * @s: The slab. + * + * A convenience wrapper for converting slab to the first struct page of the + * underlying folio, to communicate with code not yet converted to folio or + * struct slab. + */ +#define slab_page(s) folio_page(slab_folio(s), 0) + +static inline void *slab_address(const struct slab *slab) +{ + return folio_address(slab_folio(slab)); +} + +static inline int slab_nid(const struct slab *slab) +{ + return memdesc_nid(slab->flags); +} + +static inline pg_data_t *slab_pgdat(const struct slab *slab) +{ + return NODE_DATA(slab_nid(slab)); +} + +static inline struct slab *virt_to_slab(const void *addr) +{ + return page_slab(virt_to_page(addr)); +} + +static inline int slab_order(const struct slab *slab) +{ + return folio_order(slab_folio(slab)); +} + +static inline size_t slab_size(const struct slab *slab) +{ + return PAGE_SIZE << slab_order(slab); +} -#ifdef CONFIG_SLUB -#include <linux/slub_def.h> +#ifdef CONFIG_SLUB_CPU_PARTIAL +#define slub_percpu_partial(c) ((c)->partial) + +#define slub_set_percpu_partial(c, p) \ +({ \ + slub_percpu_partial(c) = (p)->next; \ +}) + +#define slub_percpu_partial_read_once(c) READ_ONCE(slub_percpu_partial(c)) +#else +#define slub_percpu_partial(c) NULL + +#define slub_set_percpu_partial(c, p) + +#define slub_percpu_partial_read_once(c) NULL +#endif // CONFIG_SLUB_CPU_PARTIAL + +/* + * Word size structure that can be atomically updated or read and that + * contains both the order and the number of objects that a slab of the + * given order would contain. + */ +struct kmem_cache_order_objects { + unsigned int x; +}; + +/* + * Slab cache management. + */ +struct kmem_cache { + struct kmem_cache_cpu __percpu *cpu_slab; + struct lock_class_key lock_key; + struct slub_percpu_sheaves __percpu *cpu_sheaves; + /* Used for retrieving partial slabs, etc. */ + slab_flags_t flags; + unsigned long min_partial; + unsigned int size; /* Object size including metadata */ + unsigned int object_size; /* Object size without metadata */ + struct reciprocal_value reciprocal_size; + unsigned int offset; /* Free pointer offset */ +#ifdef CONFIG_SLUB_CPU_PARTIAL + /* Number of per cpu partial objects to keep around */ + unsigned int cpu_partial; + /* Number of per cpu partial slabs to keep around */ + unsigned int cpu_partial_slabs; +#endif + unsigned int sheaf_capacity; + struct kmem_cache_order_objects oo; + + /* Allocation and freeing of slabs */ + struct kmem_cache_order_objects min; + gfp_t allocflags; /* gfp flags to use on each alloc */ + int refcount; /* Refcount for slab cache destroy */ + void (*ctor)(void *object); /* Object constructor */ + unsigned int inuse; /* Offset to metadata */ + unsigned int align; /* Alignment */ + unsigned int red_left_pad; /* Left redzone padding size */ + const char *name; /* Name (only for display!) */ + struct list_head list; /* List of slab caches */ +#ifdef CONFIG_SYSFS + struct kobject kobj; /* For sysfs */ +#endif +#ifdef CONFIG_SLAB_FREELIST_HARDENED + unsigned long random; #endif -#include <linux/memcontrol.h> -#include <linux/fault-inject.h> -#include <linux/kasan.h> -#include <linux/kmemleak.h> -#include <linux/random.h> -#include <linux/sched/mm.h> +#ifdef CONFIG_NUMA + /* + * Defragmentation by allocating from a remote node. + */ + unsigned int remote_node_defrag_ratio; +#endif + +#ifdef CONFIG_SLAB_FREELIST_RANDOM + unsigned int *random_seq; +#endif + +#ifdef CONFIG_KASAN_GENERIC + struct kasan_cache kasan_info; +#endif + +#ifdef CONFIG_HARDENED_USERCOPY + unsigned int useroffset; /* Usercopy region offset */ + unsigned int usersize; /* Usercopy region size */ +#endif + + struct kmem_cache_node *node[MAX_NUMNODES]; +}; + +#if defined(CONFIG_SYSFS) && !defined(CONFIG_SLUB_TINY) +#define SLAB_SUPPORTS_SYSFS 1 +void sysfs_slab_unlink(struct kmem_cache *s); +void sysfs_slab_release(struct kmem_cache *s); +#else +static inline void sysfs_slab_unlink(struct kmem_cache *s) { } +static inline void sysfs_slab_release(struct kmem_cache *s) { } +#endif + +void *fixup_red_left(struct kmem_cache *s, void *p); + +static inline void *nearest_obj(struct kmem_cache *cache, + const struct slab *slab, void *x) +{ + void *object = x - (x - slab_address(slab)) % cache->size; + void *last_object = slab_address(slab) + + (slab->objects - 1) * cache->size; + void *result = (unlikely(object > last_object)) ? last_object : object; + + result = fixup_red_left(cache, result); + return result; +} + +/* Determine object index from a given position */ +static inline unsigned int __obj_to_index(const struct kmem_cache *cache, + void *addr, void *obj) +{ + return reciprocal_divide(kasan_reset_tag(obj) - addr, + cache->reciprocal_size); +} + +static inline unsigned int obj_to_index(const struct kmem_cache *cache, + const struct slab *slab, void *obj) +{ + if (is_kfence_address(obj)) + return 0; + return __obj_to_index(cache, slab_address(slab), obj); +} + +static inline int objs_per_slab(const struct kmem_cache *cache, + const struct slab *slab) +{ + return slab->objects; +} /* * State of the slab allocator. @@ -121,7 +333,6 @@ struct memcg_cache_params { enum slab_state { DOWN, /* No slab functionality yet */ PARTIAL, /* SLUB: kmem_cache_node available */ - PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */ UP, /* Slab caches usable but not all extras yet */ FULL /* Everything is working */ }; @@ -143,22 +354,47 @@ extern const struct kmalloc_info_struct { unsigned int size; } kmalloc_info[]; -#ifndef CONFIG_SLOB /* Kmalloc array related functions */ void setup_kmalloc_cache_index_table(void); -void create_kmalloc_caches(slab_flags_t); +void create_kmalloc_caches(void); -/* Find the kmalloc slab corresponding for a certain size */ -struct kmem_cache *kmalloc_slab(size_t, gfp_t); -#endif +extern u8 kmalloc_size_index[24]; + +static inline unsigned int size_index_elem(unsigned int bytes) +{ + return (bytes - 1) / 8; +} +/* + * Find the kmem_cache structure that serves a given size of + * allocation + * + * This assumes size is larger than zero and not larger than + * KMALLOC_MAX_CACHE_SIZE and the caller must check that. + */ +static inline struct kmem_cache * +kmalloc_slab(size_t size, kmem_buckets *b, gfp_t flags, unsigned long caller) +{ + unsigned int index; + + if (!b) + b = &kmalloc_caches[kmalloc_type(flags, caller)]; + if (size <= 192) + index = kmalloc_size_index[size_index_elem(size)]; + else + index = fls(size - 1); + + return (*b)[index]; +} + +gfp_t kmalloc_fix_flags(gfp_t flags); /* Functions provided by the slab allocators */ -int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags); +int do_kmem_cache_create(struct kmem_cache *s, const char *name, + unsigned int size, struct kmem_cache_args *args, + slab_flags_t flags); -struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size, - slab_flags_t flags, unsigned int useroffset, - unsigned int usersize); +void __init kmem_cache_init(void); extern void create_boot_cache(struct kmem_cache *, const char *name, unsigned int size, slab_flags_t flags, unsigned int useroffset, unsigned int usersize); @@ -166,78 +402,44 @@ extern void create_boot_cache(struct kmem_cache *, const char *name, int slab_unmergeable(struct kmem_cache *s); struct kmem_cache *find_mergeable(unsigned size, unsigned align, slab_flags_t flags, const char *name, void (*ctor)(void *)); -#ifndef CONFIG_SLOB struct kmem_cache * __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, slab_flags_t flags, void (*ctor)(void *)); -slab_flags_t kmem_cache_flags(unsigned int object_size, - slab_flags_t flags, const char *name, - void (*ctor)(void *)); -#else -static inline struct kmem_cache * -__kmem_cache_alias(const char *name, unsigned int size, unsigned int align, - slab_flags_t flags, void (*ctor)(void *)) -{ return NULL; } +slab_flags_t kmem_cache_flags(slab_flags_t flags, const char *name); -static inline slab_flags_t kmem_cache_flags(unsigned int object_size, - slab_flags_t flags, const char *name, - void (*ctor)(void *)) +static inline bool is_kmalloc_cache(struct kmem_cache *s) { - return flags; + return (s->flags & SLAB_KMALLOC); +} + +static inline bool is_kmalloc_normal(struct kmem_cache *s) +{ + if (!is_kmalloc_cache(s)) + return false; + return !(s->flags & (SLAB_CACHE_DMA|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT)); } -#endif +bool __kfree_rcu_sheaf(struct kmem_cache *s, void *obj); +void flush_all_rcu_sheaves(void); -/* Legal flag mask for kmem_cache_create(), for various configurations */ #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \ SLAB_CACHE_DMA32 | SLAB_PANIC | \ - SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS ) + SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS | \ + SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ + SLAB_TEMPORARY | SLAB_ACCOUNT | \ + SLAB_NO_USER_FLAGS | SLAB_KMALLOC | SLAB_NO_MERGE) -#if defined(CONFIG_DEBUG_SLAB) -#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) -#elif defined(CONFIG_SLUB_DEBUG) #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ SLAB_TRACE | SLAB_CONSISTENCY_CHECKS) -#else -#define SLAB_DEBUG_FLAGS (0) -#endif - -#if defined(CONFIG_SLAB) -#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \ - SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \ - SLAB_ACCOUNT) -#elif defined(CONFIG_SLUB) -#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ - SLAB_TEMPORARY | SLAB_ACCOUNT) -#else -#define SLAB_CACHE_FLAGS (0) -#endif -/* Common flags available with current configuration */ -#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS) - -/* Common flags permitted for kmem_cache_create */ -#define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \ - SLAB_RED_ZONE | \ - SLAB_POISON | \ - SLAB_STORE_USER | \ - SLAB_TRACE | \ - SLAB_CONSISTENCY_CHECKS | \ - SLAB_MEM_SPREAD | \ - SLAB_NOLEAKTRACE | \ - SLAB_RECLAIM_ACCOUNT | \ - SLAB_TEMPORARY | \ - SLAB_ACCOUNT) +#define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS) bool __kmem_cache_empty(struct kmem_cache *); int __kmem_cache_shutdown(struct kmem_cache *); void __kmem_cache_release(struct kmem_cache *); int __kmem_cache_shrink(struct kmem_cache *); -void __kmemcg_cache_deactivate(struct kmem_cache *s); -void __kmemcg_cache_deactivate_after_rcu(struct kmem_cache *s); void slab_kmem_cache_release(struct kmem_cache *); -void kmem_cache_shrink_all(struct kmem_cache *s); struct seq_file; struct file; @@ -256,290 +458,114 @@ struct slabinfo { }; void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); -void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); -ssize_t slabinfo_write(struct file *file, const char __user *buffer, - size_t count, loff_t *ppos); - -/* - * Generic implementation of bulk operations - * These are useful for situations in which the allocator cannot - * perform optimizations. In that case segments of the object listed - * may be allocated or freed using these operations. - */ -void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **); -int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **); - -static inline int cache_vmstat_idx(struct kmem_cache *s) -{ - return (s->flags & SLAB_RECLAIM_ACCOUNT) ? - NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE; -} - -#ifdef CONFIG_MEMCG_KMEM - -/* List of all root caches. */ -extern struct list_head slab_root_caches; -#define root_caches_node memcg_params.__root_caches_node -/* - * Iterate over all memcg caches of the given root cache. The caller must hold - * slab_mutex. - */ -#define for_each_memcg_cache(iter, root) \ - list_for_each_entry(iter, &(root)->memcg_params.children, \ - memcg_params.children_node) - -static inline bool is_root_cache(struct kmem_cache *s) -{ - return !s->memcg_params.root_cache; -} - -static inline bool slab_equal_or_root(struct kmem_cache *s, - struct kmem_cache *p) +#ifdef CONFIG_SLUB_DEBUG +#ifdef CONFIG_SLUB_DEBUG_ON +DECLARE_STATIC_KEY_TRUE(slub_debug_enabled); +#else +DECLARE_STATIC_KEY_FALSE(slub_debug_enabled); +#endif +extern void print_tracking(struct kmem_cache *s, void *object); +long validate_slab_cache(struct kmem_cache *s); +static inline bool __slub_debug_enabled(void) { - return p == s || p == s->memcg_params.root_cache; + return static_branch_unlikely(&slub_debug_enabled); } - -/* - * We use suffixes to the name in memcg because we can't have caches - * created in the system with the same name. But when we print them - * locally, better refer to them with the base name - */ -static inline const char *cache_name(struct kmem_cache *s) +#else +static inline void print_tracking(struct kmem_cache *s, void *object) { - if (!is_root_cache(s)) - s = s->memcg_params.root_cache; - return s->name; } - -static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s) +static inline bool __slub_debug_enabled(void) { - if (is_root_cache(s)) - return s; - return s->memcg_params.root_cache; + return false; } +#endif /* - * Expects a pointer to a slab page. Please note, that PageSlab() check - * isn't sufficient, as it returns true also for tail compound slab pages, - * which do not have slab_cache pointer set. - * So this function assumes that the page can pass PageSlab() && !PageTail() - * check. - * - * The kmem_cache can be reparented asynchronously. The caller must ensure - * the memcg lifetime, e.g. by taking rcu_read_lock() or cgroup_mutex. + * Returns true if any of the specified slab_debug flags is enabled for the + * cache. Use only for flags parsed by setup_slub_debug() as it also enables + * the static key. */ -static inline struct mem_cgroup *memcg_from_slab_page(struct page *page) +static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) { - struct kmem_cache *s; - - s = READ_ONCE(page->slab_cache); - if (s && !is_root_cache(s)) - return READ_ONCE(s->memcg_params.memcg); - - return NULL; + if (IS_ENABLED(CONFIG_SLUB_DEBUG)) + VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); + if (__slub_debug_enabled()) + return s->flags & flags; + return false; } -/* - * Charge the slab page belonging to the non-root kmem_cache. - * Can be called for non-root kmem_caches only. - */ -static __always_inline int memcg_charge_slab(struct page *page, - gfp_t gfp, int order, - struct kmem_cache *s) -{ - unsigned int nr_pages = 1 << order; - struct mem_cgroup *memcg; - struct lruvec *lruvec; - int ret; - - rcu_read_lock(); - memcg = READ_ONCE(s->memcg_params.memcg); - while (memcg && !css_tryget_online(&memcg->css)) - memcg = parent_mem_cgroup(memcg); - rcu_read_unlock(); - - if (unlikely(!memcg || mem_cgroup_is_root(memcg))) { - mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s), - nr_pages); - percpu_ref_get_many(&s->memcg_params.refcnt, nr_pages); - return 0; - } - - ret = memcg_kmem_charge(memcg, gfp, nr_pages); - if (ret) - goto out; +#if IS_ENABLED(CONFIG_SLUB_DEBUG) && IS_ENABLED(CONFIG_KUNIT) +bool slab_in_kunit_test(void); +#else +static inline bool slab_in_kunit_test(void) { return false; } +#endif - lruvec = mem_cgroup_lruvec(memcg, page_pgdat(page)); - mod_lruvec_state(lruvec, cache_vmstat_idx(s), nr_pages); - - /* transer try_charge() page references to kmem_cache */ - percpu_ref_get_many(&s->memcg_params.refcnt, nr_pages); - css_put_many(&memcg->css, nr_pages); -out: - css_put(&memcg->css); - return ret; -} +#ifdef CONFIG_SLAB_OBJ_EXT /* - * Uncharge a slab page belonging to a non-root kmem_cache. - * Can be called for non-root kmem_caches only. + * slab_obj_exts - get the pointer to the slab object extension vector + * associated with a slab. + * @slab: a pointer to the slab struct + * + * Returns a pointer to the object extension vector associated with the slab, + * or NULL if no such vector has been associated yet. */ -static __always_inline void memcg_uncharge_slab(struct page *page, int order, - struct kmem_cache *s) -{ - unsigned int nr_pages = 1 << order; - struct mem_cgroup *memcg; - struct lruvec *lruvec; - - rcu_read_lock(); - memcg = READ_ONCE(s->memcg_params.memcg); - if (likely(!mem_cgroup_is_root(memcg))) { - lruvec = mem_cgroup_lruvec(memcg, page_pgdat(page)); - mod_lruvec_state(lruvec, cache_vmstat_idx(s), -nr_pages); - memcg_kmem_uncharge(memcg, nr_pages); - } else { - mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s), - -nr_pages); - } - rcu_read_unlock(); - - percpu_ref_put_many(&s->memcg_params.refcnt, nr_pages); -} - -extern void slab_init_memcg_params(struct kmem_cache *); -extern void memcg_link_cache(struct kmem_cache *s, struct mem_cgroup *memcg); - -#else /* CONFIG_MEMCG_KMEM */ - -/* If !memcg, all caches are root. */ -#define slab_root_caches slab_caches -#define root_caches_node list - -#define for_each_memcg_cache(iter, root) \ - for ((void)(iter), (void)(root); 0; ) - -static inline bool is_root_cache(struct kmem_cache *s) +static inline struct slabobj_ext *slab_obj_exts(struct slab *slab) { - return true; -} + unsigned long obj_exts = READ_ONCE(slab->obj_exts); -static inline bool slab_equal_or_root(struct kmem_cache *s, - struct kmem_cache *p) -{ - return s == p; +#ifdef CONFIG_MEMCG + /* + * obj_exts should be either NULL, a valid pointer with + * MEMCG_DATA_OBJEXTS bit set or be equal to OBJEXTS_ALLOC_FAIL. + */ + VM_BUG_ON_PAGE(obj_exts && !(obj_exts & MEMCG_DATA_OBJEXTS) && + obj_exts != OBJEXTS_ALLOC_FAIL, slab_page(slab)); + VM_BUG_ON_PAGE(obj_exts & MEMCG_DATA_KMEM, slab_page(slab)); +#endif + return (struct slabobj_ext *)(obj_exts & ~OBJEXTS_FLAGS_MASK); } -static inline const char *cache_name(struct kmem_cache *s) -{ - return s->name; -} +int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s, + gfp_t gfp, bool new_slab); -static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s) -{ - return s; -} +#else /* CONFIG_SLAB_OBJ_EXT */ -static inline struct mem_cgroup *memcg_from_slab_page(struct page *page) +static inline struct slabobj_ext *slab_obj_exts(struct slab *slab) { return NULL; } -static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order, - struct kmem_cache *s) -{ - return 0; -} - -static inline void memcg_uncharge_slab(struct page *page, int order, - struct kmem_cache *s) -{ -} - -static inline void slab_init_memcg_params(struct kmem_cache *s) -{ -} - -static inline void memcg_link_cache(struct kmem_cache *s, - struct mem_cgroup *memcg) -{ -} - -#endif /* CONFIG_MEMCG_KMEM */ - -static inline struct kmem_cache *virt_to_cache(const void *obj) -{ - struct page *page; - - page = virt_to_head_page(obj); - if (WARN_ONCE(!PageSlab(page), "%s: Object is not a Slab page!\n", - __func__)) - return NULL; - return page->slab_cache; -} +#endif /* CONFIG_SLAB_OBJ_EXT */ -static __always_inline int charge_slab_page(struct page *page, - gfp_t gfp, int order, - struct kmem_cache *s) +static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s) { - if (is_root_cache(s)) { - mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s), - 1 << order); - return 0; - } - - return memcg_charge_slab(page, gfp, order, s); + return (s->flags & SLAB_RECLAIM_ACCOUNT) ? + NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B; } -static __always_inline void uncharge_slab_page(struct page *page, int order, - struct kmem_cache *s) -{ - if (is_root_cache(s)) { - mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s), - -(1 << order)); - return; - } +#ifdef CONFIG_MEMCG +bool __memcg_slab_post_alloc_hook(struct kmem_cache *s, struct list_lru *lru, + gfp_t flags, size_t size, void **p); +void __memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab, + void **p, int objects, struct slabobj_ext *obj_exts); +#endif - memcg_uncharge_slab(page, order, s); -} +void kvfree_rcu_cb(struct rcu_head *head); -static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) -{ - struct kmem_cache *cachep; - - /* - * When kmemcg is not being used, both assignments should return the - * same value. but we don't want to pay the assignment price in that - * case. If it is not compiled in, the compiler should be smart enough - * to not do even the assignment. In that case, slab_equal_or_root - * will also be a constant. - */ - if (!memcg_kmem_enabled() && - !IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) && - !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS)) - return s; - - cachep = virt_to_cache(x); - WARN_ONCE(cachep && !slab_equal_or_root(cachep, s), - "%s: Wrong slab cache. %s but object is from %s\n", - __func__, s->name, cachep->name); - return cachep; -} +size_t __ksize(const void *objp); static inline size_t slab_ksize(const struct kmem_cache *s) { -#ifndef CONFIG_SLUB - return s->object_size; - -#else /* CONFIG_SLUB */ -# ifdef CONFIG_SLUB_DEBUG +#ifdef CONFIG_SLUB_DEBUG /* * Debugging requires use of the padding between object * and whatever may come after it. */ if (s->flags & (SLAB_RED_ZONE | SLAB_POISON)) return s->object_size; -# endif +#endif if (s->flags & SLAB_KASAN) return s->object_size; /* @@ -553,104 +579,19 @@ static inline size_t slab_ksize(const struct kmem_cache *s) * Else we can use all the padding etc for the allocation */ return s->size; -#endif } -static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s, - gfp_t flags) +static inline unsigned int large_kmalloc_order(const struct page *page) { - flags &= gfp_allowed_mask; - - fs_reclaim_acquire(flags); - fs_reclaim_release(flags); - - might_sleep_if(gfpflags_allow_blocking(flags)); - - if (should_failslab(s, flags)) - return NULL; - - if (memcg_kmem_enabled() && - ((flags & __GFP_ACCOUNT) || (s->flags & SLAB_ACCOUNT))) - return memcg_kmem_get_cache(s); - - return s; + return page[1].flags.f & 0xff; } -static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, - size_t size, void **p) +static inline size_t large_kmalloc_size(const struct page *page) { - size_t i; - - flags &= gfp_allowed_mask; - for (i = 0; i < size; i++) { - p[i] = kasan_slab_alloc(s, p[i], flags); - /* As p[i] might get tagged, call kmemleak hook after KASAN. */ - kmemleak_alloc_recursive(p[i], s->object_size, 1, - s->flags, flags); - } - - if (memcg_kmem_enabled()) - memcg_kmem_put_cache(s); + return PAGE_SIZE << large_kmalloc_order(page); } -#ifndef CONFIG_SLOB -/* - * The slab lists for all objects. - */ -struct kmem_cache_node { - spinlock_t list_lock; - -#ifdef CONFIG_SLAB - struct list_head slabs_partial; /* partial list first, better asm code */ - struct list_head slabs_full; - struct list_head slabs_free; - unsigned long total_slabs; /* length of all slab lists */ - unsigned long free_slabs; /* length of free slab list only */ - unsigned long free_objects; - unsigned int free_limit; - unsigned int colour_next; /* Per-node cache coloring */ - struct array_cache *shared; /* shared per node */ - struct alien_cache **alien; /* on other nodes */ - unsigned long next_reap; /* updated without locking */ - int free_touched; /* updated without locking */ -#endif - -#ifdef CONFIG_SLUB - unsigned long nr_partial; - struct list_head partial; #ifdef CONFIG_SLUB_DEBUG - atomic_long_t nr_slabs; - atomic_long_t total_objects; - struct list_head full; -#endif -#endif - -}; - -static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) -{ - return s->node[node]; -} - -/* - * Iterator over all nodes. The body will be executed for each node that has - * a kmem_cache_node structure allocated (which is true for all online nodes) - */ -#define for_each_kmem_cache_node(__s, __node, __n) \ - for (__node = 0; __node < nr_node_ids; __node++) \ - if ((__n = get_node(__s, __node))) - -#endif - -void *slab_start(struct seq_file *m, loff_t *pos); -void *slab_next(struct seq_file *m, void *p, loff_t *pos); -void slab_stop(struct seq_file *m, void *p); -void *memcg_slab_start(struct seq_file *m, loff_t *pos); -void *memcg_slab_next(struct seq_file *m, void *p, loff_t *pos); -void memcg_slab_stop(struct seq_file *m, void *p); -int memcg_slab_show(struct seq_file *m, void *p); - -#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG) void dump_unreclaimable_slab(void); #else static inline void dump_unreclaimable_slab(void) @@ -675,7 +616,8 @@ static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) { - if (static_branch_unlikely(&init_on_alloc)) { + if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, + &init_on_alloc)) { if (c->ctor) return false; if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) @@ -687,10 +629,47 @@ static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) static inline bool slab_want_init_on_free(struct kmem_cache *c) { - if (static_branch_unlikely(&init_on_free)) + if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, + &init_on_free)) return !(c->ctor || (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); return false; } +#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG) +void debugfs_slab_release(struct kmem_cache *); +#else +static inline void debugfs_slab_release(struct kmem_cache *s) { } +#endif + +#ifdef CONFIG_PRINTK +#define KS_ADDRS_COUNT 16 +struct kmem_obj_info { + void *kp_ptr; + struct slab *kp_slab; + void *kp_objp; + unsigned long kp_data_offset; + struct kmem_cache *kp_slab_cache; + void *kp_ret; + void *kp_stack[KS_ADDRS_COUNT]; + void *kp_free_stack[KS_ADDRS_COUNT]; +}; +void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab); +#endif + +void __check_heap_object(const void *ptr, unsigned long n, + const struct slab *slab, bool to_user); + +void defer_free_barrier(void); + +static inline bool slub_debug_orig_size(struct kmem_cache *s) +{ + return (kmem_cache_debug_flags(s, SLAB_STORE_USER) && + (s->flags & SLAB_KMALLOC)); +} + +#ifdef CONFIG_SLUB_DEBUG +void skip_orig_size_check(struct kmem_cache *s, const void *object); +#endif + #endif /* MM_SLAB_H */ |