197 lines
6.0 KiB
C
197 lines
6.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_SLUB_DEF_H
|
|
#define _LINUX_SLUB_DEF_H
|
|
|
|
/*
|
|
* SLUB : A Slab allocator without object queues.
|
|
*
|
|
* (C) 2007 SGI, Christoph Lameter
|
|
*/
|
|
#include <linux/kfence.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/reciprocal_div.h>
|
|
#include <linux/local_lock.h>
|
|
|
|
enum stat_item {
|
|
ALLOC_FASTPATH, /* Allocation from cpu slab */
|
|
ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */
|
|
FREE_FASTPATH, /* Free to cpu slab */
|
|
FREE_SLOWPATH, /* Freeing not to cpu slab */
|
|
FREE_FROZEN, /* Freeing to frozen slab */
|
|
FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
|
|
FREE_REMOVE_PARTIAL, /* Freeing removes last object */
|
|
ALLOC_FROM_PARTIAL, /* Cpu slab acquired from node partial list */
|
|
ALLOC_SLAB, /* Cpu slab acquired from page allocator */
|
|
ALLOC_REFILL, /* Refill cpu slab from slab freelist */
|
|
ALLOC_NODE_MISMATCH, /* Switching cpu slab */
|
|
FREE_SLAB, /* Slab freed to the page allocator */
|
|
CPUSLAB_FLUSH, /* Abandoning of the cpu slab */
|
|
DEACTIVATE_FULL, /* Cpu slab was full when deactivated */
|
|
DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */
|
|
DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
|
|
DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
|
|
DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
|
|
DEACTIVATE_BYPASS, /* Implicit deactivation */
|
|
ORDER_FALLBACK, /* Number of times fallback was necessary */
|
|
CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */
|
|
CMPXCHG_DOUBLE_FAIL, /* Number of times that cmpxchg double did not match */
|
|
CPU_PARTIAL_ALLOC, /* Used cpu partial on alloc */
|
|
CPU_PARTIAL_FREE, /* Refill cpu partial on free */
|
|
CPU_PARTIAL_NODE, /* Refill cpu partial from node partial */
|
|
CPU_PARTIAL_DRAIN, /* Drain cpu partial to node partial */
|
|
NR_SLUB_STAT_ITEMS };
|
|
|
|
/*
|
|
* When changing the layout, make sure freelist and tid are still compatible
|
|
* with this_cpu_cmpxchg_double() alignment requirements.
|
|
*/
|
|
struct kmem_cache_cpu {
|
|
void **freelist; /* Pointer to next available object */
|
|
unsigned long tid; /* Globally unique transaction id */
|
|
struct page *page; /* The slab from which we are allocating */
|
|
#ifdef CONFIG_SLUB_CPU_PARTIAL
|
|
struct page *partial; /* Partially allocated frozen slabs */
|
|
#endif
|
|
local_lock_t lock; /* Protects the fields above */
|
|
#ifdef CONFIG_SLUB_STATS
|
|
unsigned stat[NR_SLUB_STAT_ITEMS];
|
|
#endif
|
|
};
|
|
|
|
#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;
|
|
/* Used for retrieving partial slabs, etc. */
|
|
slab_flags_t flags;
|
|
unsigned long min_partial;
|
|
unsigned int size; /* The size of an object including metadata */
|
|
unsigned int object_size;/* The size of an object 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 pages to keep around */
|
|
unsigned int cpu_partial_pages;
|
|
#endif
|
|
struct kmem_cache_order_objects oo;
|
|
|
|
/* Allocation and freeing of slabs */
|
|
struct kmem_cache_order_objects max;
|
|
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 *);
|
|
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
|
|
|
|
#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
|
|
struct kasan_cache kasan_info;
|
|
#endif
|
|
|
|
unsigned int useroffset; /* Usercopy region offset */
|
|
unsigned int usersize; /* Usercopy region size */
|
|
|
|
struct kmem_cache_node *node[MAX_NUMNODES];
|
|
};
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
#define SLAB_SUPPORTS_SYSFS
|
|
void sysfs_slab_unlink(struct kmem_cache *);
|
|
void sysfs_slab_release(struct kmem_cache *);
|
|
#else
|
|
static inline void sysfs_slab_unlink(struct kmem_cache *s)
|
|
{
|
|
}
|
|
static inline void sysfs_slab_release(struct kmem_cache *s)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
void object_err(struct kmem_cache *s, struct page *page,
|
|
u8 *object, char *reason);
|
|
|
|
void *fixup_red_left(struct kmem_cache *s, void *p);
|
|
|
|
static inline void *nearest_obj(struct kmem_cache *cache, struct page *page,
|
|
void *x) {
|
|
void *object = x - (x - page_address(page)) % cache->size;
|
|
void *last_object = page_address(page) +
|
|
(page->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 page *page, void *obj)
|
|
{
|
|
if (is_kfence_address(obj))
|
|
return 0;
|
|
return __obj_to_index(cache, page_address(page), obj);
|
|
}
|
|
|
|
static inline int objs_per_slab_page(const struct kmem_cache *cache,
|
|
const struct page *page)
|
|
{
|
|
return page->objects;
|
|
}
|
|
#endif /* _LINUX_SLUB_DEF_H */
|