mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
874 lines
23 KiB
874 lines
23 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef MM_SLAB_H |
|
#define MM_SLAB_H |
|
/* |
|
* Internal slab definitions |
|
*/ |
|
|
|
/* Reuses the bits in struct page */ |
|
struct slab { |
|
unsigned long __page_flags; |
|
|
|
#if defined(CONFIG_SLAB) |
|
|
|
union { |
|
struct list_head slab_list; |
|
struct rcu_head rcu_head; |
|
}; |
|
struct kmem_cache *slab_cache; |
|
void *freelist; /* array of free object indexes */ |
|
void *s_mem; /* first object */ |
|
unsigned int active; |
|
|
|
#elif defined(CONFIG_SLUB) |
|
|
|
union { |
|
struct list_head slab_list; |
|
struct rcu_head rcu_head; |
|
#ifdef CONFIG_SLUB_CPU_PARTIAL |
|
struct { |
|
struct slab *next; |
|
int slabs; /* Nr of slabs left */ |
|
}; |
|
#endif |
|
}; |
|
struct kmem_cache *slab_cache; |
|
/* Double-word boundary */ |
|
void *freelist; /* first free object */ |
|
union { |
|
unsigned long counters; |
|
struct { |
|
unsigned inuse:16; |
|
unsigned objects:15; |
|
unsigned frozen:1; |
|
}; |
|
}; |
|
unsigned int __unused; |
|
|
|
#elif defined(CONFIG_SLOB) |
|
|
|
struct list_head slab_list; |
|
void *__unused_1; |
|
void *freelist; /* first free block */ |
|
long units; |
|
unsigned int __unused_2; |
|
|
|
#else |
|
#error "Unexpected slab allocator configured" |
|
#endif |
|
|
|
atomic_t __page_refcount; |
|
#ifdef CONFIG_MEMCG |
|
unsigned long memcg_data; |
|
#endif |
|
}; |
|
|
|
#define SLAB_MATCH(pg, sl) \ |
|
static_assert(offsetof(struct page, pg) == offsetof(struct slab, sl)) |
|
SLAB_MATCH(flags, __page_flags); |
|
SLAB_MATCH(compound_head, slab_list); /* Ensure bit 0 is clear */ |
|
#ifndef CONFIG_SLOB |
|
SLAB_MATCH(rcu_head, rcu_head); |
|
#endif |
|
SLAB_MATCH(_refcount, __page_refcount); |
|
#ifdef CONFIG_MEMCG |
|
SLAB_MATCH(memcg_data, memcg_data); |
|
#endif |
|
#undef SLAB_MATCH |
|
static_assert(sizeof(struct slab) <= sizeof(struct page)); |
|
|
|
/** |
|
* folio_slab - Converts from folio to slab. |
|
* @folio: The folio. |
|
* |
|
* Currently struct slab is a different representation of a folio where |
|
* folio_test_slab() is true. |
|
* |
|
* Return: The slab which contains this folio. |
|
*/ |
|
#define folio_slab(folio) (_Generic((folio), \ |
|
const struct folio *: (const struct slab *)(folio), \ |
|
struct folio *: (struct slab *)(folio))) |
|
|
|
/** |
|
* slab_folio - The folio allocated for a slab |
|
* @slab: 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 first struct page to slab. |
|
* @p: The first (either head of compound or single) page of slab. |
|
* |
|
* A temporary wrapper to convert struct page to struct slab in situations where |
|
* we know the page is the compound head, or single order-0 page. |
|
* |
|
* Long-term ideally everything would work with struct slab directly or go |
|
* through folio to struct slab. |
|
* |
|
* Return: The slab which contains this page |
|
*/ |
|
#define page_slab(p) (_Generic((p), \ |
|
const struct page *: (const struct slab *)(p), \ |
|
struct page *: (struct slab *)(p))) |
|
|
|
/** |
|
* slab_page - The first struct page allocated for a slab |
|
* @slab: 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) |
|
|
|
/* |
|
* If network-based swap is enabled, sl*b must keep track of whether pages |
|
* were allocated from pfmemalloc reserves. |
|
*/ |
|
static inline bool slab_test_pfmemalloc(const struct slab *slab) |
|
{ |
|
return folio_test_active((struct folio *)slab_folio(slab)); |
|
} |
|
|
|
static inline void slab_set_pfmemalloc(struct slab *slab) |
|
{ |
|
folio_set_active(slab_folio(slab)); |
|
} |
|
|
|
static inline void slab_clear_pfmemalloc(struct slab *slab) |
|
{ |
|
folio_clear_active(slab_folio(slab)); |
|
} |
|
|
|
static inline void __slab_clear_pfmemalloc(struct slab *slab) |
|
{ |
|
__folio_clear_active(slab_folio(slab)); |
|
} |
|
|
|
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 folio_nid(slab_folio(slab)); |
|
} |
|
|
|
static inline pg_data_t *slab_pgdat(const struct slab *slab) |
|
{ |
|
return folio_pgdat(slab_folio(slab)); |
|
} |
|
|
|
static inline struct slab *virt_to_slab(const void *addr) |
|
{ |
|
struct folio *folio = virt_to_folio(addr); |
|
|
|
if (!folio_test_slab(folio)) |
|
return NULL; |
|
|
|
return folio_slab(folio); |
|
} |
|
|
|
static inline int slab_order(const struct slab *slab) |
|
{ |
|
return folio_order((struct folio *)slab_folio(slab)); |
|
} |
|
|
|
static inline size_t slab_size(const struct slab *slab) |
|
{ |
|
return PAGE_SIZE << slab_order(slab); |
|
} |
|
|
|
#ifdef CONFIG_SLOB |
|
/* |
|
* 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. |
|
*/ |
|
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 */ |
|
}; |
|
|
|
#endif /* CONFIG_SLOB */ |
|
|
|
#ifdef CONFIG_SLAB |
|
#include <linux/slab_def.h> |
|
#endif |
|
|
|
#ifdef CONFIG_SLUB |
|
#include <linux/slub_def.h> |
|
#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> |
|
#include <linux/list_lru.h> |
|
|
|
/* |
|
* State of the slab allocator. |
|
* |
|
* This is used to describe the states of the allocator during bootup. |
|
* Allocators use this to gradually bootstrap themselves. Most allocators |
|
* have the problem that the structures used for managing slab caches are |
|
* allocated from slab caches themselves. |
|
*/ |
|
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 */ |
|
}; |
|
|
|
extern enum slab_state slab_state; |
|
|
|
/* The slab cache mutex protects the management structures during changes */ |
|
extern struct mutex slab_mutex; |
|
|
|
/* The list of all slab caches on the system */ |
|
extern struct list_head slab_caches; |
|
|
|
/* The slab cache that manages slab cache information */ |
|
extern struct kmem_cache *kmem_cache; |
|
|
|
/* A table of kmalloc cache names and sizes */ |
|
extern const struct kmalloc_info_struct { |
|
const char *name[NR_KMALLOC_TYPES]; |
|
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); |
|
|
|
/* Find the kmalloc slab corresponding for a certain size */ |
|
struct kmem_cache *kmalloc_slab(size_t, gfp_t); |
|
|
|
void *__kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, |
|
int node, size_t orig_size, |
|
unsigned long caller); |
|
void __kmem_cache_free(struct kmem_cache *s, void *x, unsigned long caller); |
|
#endif |
|
|
|
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); |
|
|
|
struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size, |
|
slab_flags_t flags, unsigned int useroffset, |
|
unsigned int usersize); |
|
extern void create_boot_cache(struct kmem_cache *, const char *name, |
|
unsigned int size, slab_flags_t flags, |
|
unsigned int useroffset, unsigned int usersize); |
|
|
|
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); |
|
#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; } |
|
|
|
static inline slab_flags_t kmem_cache_flags(unsigned int object_size, |
|
slab_flags_t flags, const char *name) |
|
{ |
|
return flags; |
|
} |
|
#endif |
|
|
|
|
|
/* 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 ) |
|
|
|
#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 | SLAB_NO_USER_FLAGS) |
|
#else |
|
#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE) |
|
#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 | \ |
|
SLAB_NO_USER_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 slab_kmem_cache_release(struct kmem_cache *); |
|
|
|
struct seq_file; |
|
struct file; |
|
|
|
struct slabinfo { |
|
unsigned long active_objs; |
|
unsigned long num_objs; |
|
unsigned long active_slabs; |
|
unsigned long num_slabs; |
|
unsigned long shared_avail; |
|
unsigned int limit; |
|
unsigned int batchcount; |
|
unsigned int shared; |
|
unsigned int objects_per_slab; |
|
unsigned int cache_order; |
|
}; |
|
|
|
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); |
|
|
|
static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s) |
|
{ |
|
return (s->flags & SLAB_RECLAIM_ACCOUNT) ? |
|
NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B; |
|
} |
|
|
|
#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 static_branch_unlikely(&slub_debug_enabled); |
|
} |
|
#else |
|
static inline void print_tracking(struct kmem_cache *s, void *object) |
|
{ |
|
} |
|
static inline bool __slub_debug_enabled(void) |
|
{ |
|
return false; |
|
} |
|
#endif |
|
|
|
/* |
|
* Returns true if any of the specified slub_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 bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) |
|
{ |
|
if (IS_ENABLED(CONFIG_SLUB_DEBUG)) |
|
VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); |
|
if (__slub_debug_enabled()) |
|
return s->flags & flags; |
|
return false; |
|
} |
|
|
|
#ifdef CONFIG_MEMCG_KMEM |
|
/* |
|
* slab_objcgs - get the object cgroups vector associated with a slab |
|
* @slab: a pointer to the slab struct |
|
* |
|
* Returns a pointer to the object cgroups vector associated with the slab, |
|
* or NULL if no such vector has been associated yet. |
|
*/ |
|
static inline struct obj_cgroup **slab_objcgs(struct slab *slab) |
|
{ |
|
unsigned long memcg_data = READ_ONCE(slab->memcg_data); |
|
|
|
VM_BUG_ON_PAGE(memcg_data && !(memcg_data & MEMCG_DATA_OBJCGS), |
|
slab_page(slab)); |
|
VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_KMEM, slab_page(slab)); |
|
|
|
return (struct obj_cgroup **)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); |
|
} |
|
|
|
int memcg_alloc_slab_cgroups(struct slab *slab, struct kmem_cache *s, |
|
gfp_t gfp, bool new_slab); |
|
void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat, |
|
enum node_stat_item idx, int nr); |
|
|
|
static inline void memcg_free_slab_cgroups(struct slab *slab) |
|
{ |
|
kfree(slab_objcgs(slab)); |
|
slab->memcg_data = 0; |
|
} |
|
|
|
static inline size_t obj_full_size(struct kmem_cache *s) |
|
{ |
|
/* |
|
* For each accounted object there is an extra space which is used |
|
* to store obj_cgroup membership. Charge it too. |
|
*/ |
|
return s->size + sizeof(struct obj_cgroup *); |
|
} |
|
|
|
/* |
|
* Returns false if the allocation should fail. |
|
*/ |
|
static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s, |
|
struct list_lru *lru, |
|
struct obj_cgroup **objcgp, |
|
size_t objects, gfp_t flags) |
|
{ |
|
struct obj_cgroup *objcg; |
|
|
|
if (!memcg_kmem_enabled()) |
|
return true; |
|
|
|
if (!(flags & __GFP_ACCOUNT) && !(s->flags & SLAB_ACCOUNT)) |
|
return true; |
|
|
|
objcg = get_obj_cgroup_from_current(); |
|
if (!objcg) |
|
return true; |
|
|
|
if (lru) { |
|
int ret; |
|
struct mem_cgroup *memcg; |
|
|
|
memcg = get_mem_cgroup_from_objcg(objcg); |
|
ret = memcg_list_lru_alloc(memcg, lru, flags); |
|
css_put(&memcg->css); |
|
|
|
if (ret) |
|
goto out; |
|
} |
|
|
|
if (obj_cgroup_charge(objcg, flags, objects * obj_full_size(s))) |
|
goto out; |
|
|
|
*objcgp = objcg; |
|
return true; |
|
out: |
|
obj_cgroup_put(objcg); |
|
return false; |
|
} |
|
|
|
static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, |
|
struct obj_cgroup *objcg, |
|
gfp_t flags, size_t size, |
|
void **p) |
|
{ |
|
struct slab *slab; |
|
unsigned long off; |
|
size_t i; |
|
|
|
if (!memcg_kmem_enabled() || !objcg) |
|
return; |
|
|
|
for (i = 0; i < size; i++) { |
|
if (likely(p[i])) { |
|
slab = virt_to_slab(p[i]); |
|
|
|
if (!slab_objcgs(slab) && |
|
memcg_alloc_slab_cgroups(slab, s, flags, |
|
false)) { |
|
obj_cgroup_uncharge(objcg, obj_full_size(s)); |
|
continue; |
|
} |
|
|
|
off = obj_to_index(s, slab, p[i]); |
|
obj_cgroup_get(objcg); |
|
slab_objcgs(slab)[off] = objcg; |
|
mod_objcg_state(objcg, slab_pgdat(slab), |
|
cache_vmstat_idx(s), obj_full_size(s)); |
|
} else { |
|
obj_cgroup_uncharge(objcg, obj_full_size(s)); |
|
} |
|
} |
|
obj_cgroup_put(objcg); |
|
} |
|
|
|
static inline void memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab, |
|
void **p, int objects) |
|
{ |
|
struct obj_cgroup **objcgs; |
|
int i; |
|
|
|
if (!memcg_kmem_enabled()) |
|
return; |
|
|
|
objcgs = slab_objcgs(slab); |
|
if (!objcgs) |
|
return; |
|
|
|
for (i = 0; i < objects; i++) { |
|
struct obj_cgroup *objcg; |
|
unsigned int off; |
|
|
|
off = obj_to_index(s, slab, p[i]); |
|
objcg = objcgs[off]; |
|
if (!objcg) |
|
continue; |
|
|
|
objcgs[off] = NULL; |
|
obj_cgroup_uncharge(objcg, obj_full_size(s)); |
|
mod_objcg_state(objcg, slab_pgdat(slab), cache_vmstat_idx(s), |
|
-obj_full_size(s)); |
|
obj_cgroup_put(objcg); |
|
} |
|
} |
|
|
|
#else /* CONFIG_MEMCG_KMEM */ |
|
static inline struct obj_cgroup **slab_objcgs(struct slab *slab) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline int memcg_alloc_slab_cgroups(struct slab *slab, |
|
struct kmem_cache *s, gfp_t gfp, |
|
bool new_slab) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void memcg_free_slab_cgroups(struct slab *slab) |
|
{ |
|
} |
|
|
|
static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s, |
|
struct list_lru *lru, |
|
struct obj_cgroup **objcgp, |
|
size_t objects, gfp_t flags) |
|
{ |
|
return true; |
|
} |
|
|
|
static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, |
|
struct obj_cgroup *objcg, |
|
gfp_t flags, size_t size, |
|
void **p) |
|
{ |
|
} |
|
|
|
static inline void memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab, |
|
void **p, int objects) |
|
{ |
|
} |
|
#endif /* CONFIG_MEMCG_KMEM */ |
|
|
|
#ifndef CONFIG_SLOB |
|
static inline struct kmem_cache *virt_to_cache(const void *obj) |
|
{ |
|
struct slab *slab; |
|
|
|
slab = virt_to_slab(obj); |
|
if (WARN_ONCE(!slab, "%s: Object is not a Slab page!\n", |
|
__func__)) |
|
return NULL; |
|
return slab->slab_cache; |
|
} |
|
|
|
static __always_inline void account_slab(struct slab *slab, int order, |
|
struct kmem_cache *s, gfp_t gfp) |
|
{ |
|
if (memcg_kmem_enabled() && (s->flags & SLAB_ACCOUNT)) |
|
memcg_alloc_slab_cgroups(slab, s, gfp, true); |
|
|
|
mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s), |
|
PAGE_SIZE << order); |
|
} |
|
|
|
static __always_inline void unaccount_slab(struct slab *slab, int order, |
|
struct kmem_cache *s) |
|
{ |
|
if (memcg_kmem_enabled()) |
|
memcg_free_slab_cgroups(slab); |
|
|
|
mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s), |
|
-(PAGE_SIZE << order)); |
|
} |
|
|
|
static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) |
|
{ |
|
struct kmem_cache *cachep; |
|
|
|
if (!IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) && |
|
!kmem_cache_debug_flags(s, SLAB_CONSISTENCY_CHECKS)) |
|
return s; |
|
|
|
cachep = virt_to_cache(x); |
|
if (WARN(cachep && cachep != s, |
|
"%s: Wrong slab cache. %s but object is from %s\n", |
|
__func__, s->name, cachep->name)) |
|
print_tracking(cachep, x); |
|
return cachep; |
|
} |
|
|
|
void free_large_kmalloc(struct folio *folio, void *object); |
|
|
|
#endif /* CONFIG_SLOB */ |
|
|
|
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 |
|
/* |
|
* 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 |
|
if (s->flags & SLAB_KASAN) |
|
return s->object_size; |
|
/* |
|
* If we have the need to store the freelist pointer |
|
* back there or track user information then we can |
|
* only use the space before that information. |
|
*/ |
|
if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER)) |
|
return s->inuse; |
|
/* |
|
* 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, |
|
struct list_lru *lru, |
|
struct obj_cgroup **objcgp, |
|
size_t size, gfp_t flags) |
|
{ |
|
flags &= gfp_allowed_mask; |
|
|
|
might_alloc(flags); |
|
|
|
if (should_failslab(s, flags)) |
|
return NULL; |
|
|
|
if (!memcg_slab_pre_alloc_hook(s, lru, objcgp, size, flags)) |
|
return NULL; |
|
|
|
return s; |
|
} |
|
|
|
static inline void slab_post_alloc_hook(struct kmem_cache *s, |
|
struct obj_cgroup *objcg, gfp_t flags, |
|
size_t size, void **p, bool init) |
|
{ |
|
size_t i; |
|
|
|
flags &= gfp_allowed_mask; |
|
|
|
/* |
|
* As memory initialization might be integrated into KASAN, |
|
* kasan_slab_alloc and initialization memset must be |
|
* kept together to avoid discrepancies in behavior. |
|
* |
|
* As p[i] might get tagged, memset and kmemleak hook come after KASAN. |
|
*/ |
|
for (i = 0; i < size; i++) { |
|
p[i] = kasan_slab_alloc(s, p[i], flags, init); |
|
if (p[i] && init && !kasan_has_integrated_init()) |
|
memset(p[i], 0, s->object_size); |
|
kmemleak_alloc_recursive(p[i], s->object_size, 1, |
|
s->flags, flags); |
|
kmsan_slab_alloc(s, p[i], flags); |
|
} |
|
|
|
memcg_slab_post_alloc_hook(s, objcg, flags, size, p); |
|
} |
|
|
|
#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 |
|
|
|
#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG) |
|
void dump_unreclaimable_slab(void); |
|
#else |
|
static inline void dump_unreclaimable_slab(void) |
|
{ |
|
} |
|
#endif |
|
|
|
void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr); |
|
|
|
#ifdef CONFIG_SLAB_FREELIST_RANDOM |
|
int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count, |
|
gfp_t gfp); |
|
void cache_random_seq_destroy(struct kmem_cache *cachep); |
|
#else |
|
static inline int cache_random_seq_create(struct kmem_cache *cachep, |
|
unsigned int count, gfp_t gfp) |
|
{ |
|
return 0; |
|
} |
|
static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } |
|
#endif /* CONFIG_SLAB_FREELIST_RANDOM */ |
|
|
|
static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) |
|
{ |
|
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)) |
|
return flags & __GFP_ZERO; |
|
return true; |
|
} |
|
return flags & __GFP_ZERO; |
|
} |
|
|
|
static inline bool slab_want_init_on_free(struct kmem_cache *c) |
|
{ |
|
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 |
|
|
|
#ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR |
|
void __check_heap_object(const void *ptr, unsigned long n, |
|
const struct slab *slab, bool to_user); |
|
#else |
|
static inline |
|
void __check_heap_object(const void *ptr, unsigned long n, |
|
const struct slab *slab, bool to_user) |
|
{ |
|
} |
|
#endif |
|
|
|
#endif /* MM_SLAB_H */
|
|
|