199 lines
6.1 KiB
C
199 lines
6.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SLUB_DEF_H
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#define _LINUX_SLUB_DEF_H
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/*
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* SLUB : A Slab allocator without object queues.
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*
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* (C) 2007 SGI, Christoph Lameter
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*/
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#include <linux/kfence.h>
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#include <linux/kobject.h>
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#include <linux/reciprocal_div.h>
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#include <linux/local_lock.h>
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enum stat_item {
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ALLOC_FASTPATH, /* Allocation from cpu slab */
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ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */
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FREE_FASTPATH, /* Free to cpu slab */
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FREE_SLOWPATH, /* Freeing not to cpu slab */
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FREE_FROZEN, /* Freeing to frozen slab */
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FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
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FREE_REMOVE_PARTIAL, /* Freeing removes last object */
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ALLOC_FROM_PARTIAL, /* Cpu slab acquired from node partial list */
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ALLOC_SLAB, /* Cpu slab acquired from page allocator */
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ALLOC_REFILL, /* Refill cpu slab from slab freelist */
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ALLOC_NODE_MISMATCH, /* Switching cpu slab */
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FREE_SLAB, /* Slab freed to the page allocator */
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CPUSLAB_FLUSH, /* Abandoning of the cpu slab */
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DEACTIVATE_FULL, /* Cpu slab was full when deactivated */
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DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */
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DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
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DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
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DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
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DEACTIVATE_BYPASS, /* Implicit deactivation */
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ORDER_FALLBACK, /* Number of times fallback was necessary */
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CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */
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CMPXCHG_DOUBLE_FAIL, /* Number of times that cmpxchg double did not match */
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CPU_PARTIAL_ALLOC, /* Used cpu partial on alloc */
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CPU_PARTIAL_FREE, /* Refill cpu partial on free */
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CPU_PARTIAL_NODE, /* Refill cpu partial from node partial */
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CPU_PARTIAL_DRAIN, /* Drain cpu partial to node partial */
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NR_SLUB_STAT_ITEMS };
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#ifndef CONFIG_SLUB_TINY
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/*
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* When changing the layout, make sure freelist and tid are still compatible
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* with this_cpu_cmpxchg_double() alignment requirements.
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*/
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struct kmem_cache_cpu {
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void **freelist; /* Pointer to next available object */
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unsigned long tid; /* Globally unique transaction id */
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struct slab *slab; /* The slab from which we are allocating */
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#ifdef CONFIG_SLUB_CPU_PARTIAL
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struct slab *partial; /* Partially allocated frozen slabs */
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#endif
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local_lock_t lock; /* Protects the fields above */
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#ifdef CONFIG_SLUB_STATS
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unsigned stat[NR_SLUB_STAT_ITEMS];
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#endif
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};
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#endif /* CONFIG_SLUB_TINY */
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#ifdef CONFIG_SLUB_CPU_PARTIAL
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#define slub_percpu_partial(c) ((c)->partial)
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#define slub_set_percpu_partial(c, p) \
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({ \
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slub_percpu_partial(c) = (p)->next; \
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})
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#define slub_percpu_partial_read_once(c) READ_ONCE(slub_percpu_partial(c))
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#else
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#define slub_percpu_partial(c) NULL
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#define slub_set_percpu_partial(c, p)
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#define slub_percpu_partial_read_once(c) NULL
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#endif // CONFIG_SLUB_CPU_PARTIAL
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/*
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* Word size structure that can be atomically updated or read and that
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* contains both the order and the number of objects that a slab of the
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* given order would contain.
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*/
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struct kmem_cache_order_objects {
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unsigned int x;
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};
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/*
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* Slab cache management.
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*/
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struct kmem_cache {
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#ifndef CONFIG_SLUB_TINY
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struct kmem_cache_cpu __percpu *cpu_slab;
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#endif
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/* Used for retrieving partial slabs, etc. */
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slab_flags_t flags;
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unsigned long min_partial;
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unsigned int size; /* The size of an object including metadata */
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unsigned int object_size;/* The size of an object without metadata */
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struct reciprocal_value reciprocal_size;
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unsigned int offset; /* Free pointer offset */
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#ifdef CONFIG_SLUB_CPU_PARTIAL
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/* Number of per cpu partial objects to keep around */
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unsigned int cpu_partial;
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/* Number of per cpu partial slabs to keep around */
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unsigned int cpu_partial_slabs;
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#endif
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struct kmem_cache_order_objects oo;
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/* Allocation and freeing of slabs */
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struct kmem_cache_order_objects min;
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gfp_t allocflags; /* gfp flags to use on each alloc */
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int refcount; /* Refcount for slab cache destroy */
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void (*ctor)(void *);
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unsigned int inuse; /* Offset to metadata */
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unsigned int align; /* Alignment */
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unsigned int red_left_pad; /* Left redzone padding size */
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const char *name; /* Name (only for display!) */
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struct list_head list; /* List of slab caches */
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#ifdef CONFIG_SYSFS
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struct kobject kobj; /* For sysfs */
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#endif
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#ifdef CONFIG_SLAB_FREELIST_HARDENED
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unsigned long random;
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#endif
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#ifdef CONFIG_NUMA
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/*
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* Defragmentation by allocating from a remote node.
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*/
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unsigned int remote_node_defrag_ratio;
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#endif
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#ifdef CONFIG_SLAB_FREELIST_RANDOM
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unsigned int *random_seq;
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#endif
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#ifdef CONFIG_KASAN
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struct kasan_cache kasan_info;
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#endif
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#ifdef CONFIG_HARDENED_USERCOPY
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unsigned int useroffset; /* Usercopy region offset */
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unsigned int usersize; /* Usercopy region size */
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#endif
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struct kmem_cache_node *node[MAX_NUMNODES];
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};
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#if defined(CONFIG_SYSFS) && !defined(CONFIG_SLUB_TINY)
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#define SLAB_SUPPORTS_SYSFS
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void sysfs_slab_unlink(struct kmem_cache *);
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void sysfs_slab_release(struct kmem_cache *);
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#else
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static inline void sysfs_slab_unlink(struct kmem_cache *s)
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{
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}
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static inline void sysfs_slab_release(struct kmem_cache *s)
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{
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}
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#endif
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void *fixup_red_left(struct kmem_cache *s, void *p);
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static inline void *nearest_obj(struct kmem_cache *cache, const struct slab *slab,
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void *x) {
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void *object = x - (x - slab_address(slab)) % cache->size;
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void *last_object = slab_address(slab) +
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(slab->objects - 1) * cache->size;
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void *result = (unlikely(object > last_object)) ? last_object : object;
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result = fixup_red_left(cache, result);
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return result;
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}
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/* Determine object index from a given position */
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static inline unsigned int __obj_to_index(const struct kmem_cache *cache,
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void *addr, void *obj)
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{
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return reciprocal_divide(kasan_reset_tag(obj) - addr,
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cache->reciprocal_size);
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}
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static inline unsigned int obj_to_index(const struct kmem_cache *cache,
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const struct slab *slab, void *obj)
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{
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if (is_kfence_address(obj))
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return 0;
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return __obj_to_index(cache, slab_address(slab), obj);
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}
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static inline int objs_per_slab(const struct kmem_cache *cache,
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const struct slab *slab)
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{
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return slab->objects;
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}
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#endif /* _LINUX_SLUB_DEF_H */
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