525 lines
14 KiB
C
525 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef MM_SLAB_H
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#define MM_SLAB_H
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/*
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* Internal slab definitions
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*/
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#ifdef CONFIG_SLOB
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/*
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* Common fields provided in kmem_cache by all slab allocators
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* This struct is either used directly by the allocator (SLOB)
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* or the allocator must include definitions for all fields
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* provided in kmem_cache_common in their definition of kmem_cache.
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*
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* Once we can do anonymous structs (C11 standard) we could put a
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* anonymous struct definition in these allocators so that the
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* separate allocations in the kmem_cache structure of SLAB and
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* SLUB is no longer needed.
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*/
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struct kmem_cache {
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unsigned int object_size;/* The original size of the object */
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unsigned int size; /* The aligned/padded/added on size */
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unsigned int align; /* Alignment as calculated */
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unsigned long flags; /* Active flags on the slab */
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const char *name; /* Slab name for sysfs */
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int refcount; /* Use counter */
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void (*ctor)(void *); /* Called on object slot creation */
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struct list_head list; /* List of all slab caches on the system */
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};
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#endif /* CONFIG_SLOB */
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#ifdef CONFIG_SLAB
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#include <linux/slab_def.h>
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#endif
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#ifdef CONFIG_SLUB
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#include <linux/slub_def.h>
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#endif
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#include <linux/memcontrol.h>
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#include <linux/fault-inject.h>
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#include <linux/kmemcheck.h>
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#include <linux/kasan.h>
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#include <linux/kmemleak.h>
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#include <linux/random.h>
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#include <linux/sched/mm.h>
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/*
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* State of the slab allocator.
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*
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* This is used to describe the states of the allocator during bootup.
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* Allocators use this to gradually bootstrap themselves. Most allocators
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* have the problem that the structures used for managing slab caches are
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* allocated from slab caches themselves.
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*/
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enum slab_state {
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DOWN, /* No slab functionality yet */
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PARTIAL, /* SLUB: kmem_cache_node available */
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PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */
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UP, /* Slab caches usable but not all extras yet */
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FULL /* Everything is working */
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};
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extern enum slab_state slab_state;
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/* The slab cache mutex protects the management structures during changes */
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extern struct mutex slab_mutex;
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/* The list of all slab caches on the system */
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extern struct list_head slab_caches;
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/* The slab cache that manages slab cache information */
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extern struct kmem_cache *kmem_cache;
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/* A table of kmalloc cache names and sizes */
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extern const struct kmalloc_info_struct {
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const char *name;
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unsigned long size;
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} kmalloc_info[];
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unsigned long calculate_alignment(unsigned long flags,
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unsigned long align, unsigned long size);
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#ifndef CONFIG_SLOB
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/* Kmalloc array related functions */
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void setup_kmalloc_cache_index_table(void);
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void create_kmalloc_caches(unsigned long);
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/* Find the kmalloc slab corresponding for a certain size */
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struct kmem_cache *kmalloc_slab(size_t, gfp_t);
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#endif
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/* Functions provided by the slab allocators */
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extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
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extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
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unsigned long flags);
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extern void create_boot_cache(struct kmem_cache *, const char *name,
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size_t size, unsigned long flags);
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int slab_unmergeable(struct kmem_cache *s);
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struct kmem_cache *find_mergeable(size_t size, size_t align,
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unsigned long flags, const char *name, void (*ctor)(void *));
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#ifndef CONFIG_SLOB
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struct kmem_cache *
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__kmem_cache_alias(const char *name, size_t size, size_t align,
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unsigned long flags, void (*ctor)(void *));
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unsigned long kmem_cache_flags(unsigned long object_size,
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unsigned long flags, const char *name,
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void (*ctor)(void *));
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#else
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static inline struct kmem_cache *
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__kmem_cache_alias(const char *name, size_t size, size_t align,
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unsigned long flags, void (*ctor)(void *))
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{ return NULL; }
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static inline unsigned long kmem_cache_flags(unsigned long object_size,
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unsigned long flags, const char *name,
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void (*ctor)(void *))
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{
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return flags;
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}
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#endif
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/* Legal flag mask for kmem_cache_create(), for various configurations */
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#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | SLAB_PANIC | \
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SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS )
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#if defined(CONFIG_DEBUG_SLAB)
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#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
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#elif defined(CONFIG_SLUB_DEBUG)
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#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
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SLAB_TRACE | SLAB_CONSISTENCY_CHECKS)
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#else
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#define SLAB_DEBUG_FLAGS (0)
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#endif
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#if defined(CONFIG_SLAB)
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#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
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SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \
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SLAB_NOTRACK | SLAB_ACCOUNT)
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#elif defined(CONFIG_SLUB)
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#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
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SLAB_TEMPORARY | SLAB_NOTRACK | SLAB_ACCOUNT)
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#else
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#define SLAB_CACHE_FLAGS (0)
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#endif
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/* Common flags available with current configuration */
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#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
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/* Common flags permitted for kmem_cache_create */
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#define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \
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SLAB_RED_ZONE | \
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SLAB_POISON | \
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SLAB_STORE_USER | \
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SLAB_TRACE | \
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SLAB_CONSISTENCY_CHECKS | \
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SLAB_MEM_SPREAD | \
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SLAB_NOLEAKTRACE | \
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SLAB_RECLAIM_ACCOUNT | \
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SLAB_TEMPORARY | \
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SLAB_NOTRACK | \
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SLAB_ACCOUNT)
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int __kmem_cache_shutdown(struct kmem_cache *);
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void __kmem_cache_release(struct kmem_cache *);
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int __kmem_cache_shrink(struct kmem_cache *);
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void __kmemcg_cache_deactivate(struct kmem_cache *s);
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void slab_kmem_cache_release(struct kmem_cache *);
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struct seq_file;
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struct file;
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struct slabinfo {
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unsigned long active_objs;
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unsigned long num_objs;
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unsigned long active_slabs;
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unsigned long num_slabs;
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unsigned long shared_avail;
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unsigned int limit;
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unsigned int batchcount;
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unsigned int shared;
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unsigned int objects_per_slab;
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unsigned int cache_order;
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};
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void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
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void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
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ssize_t slabinfo_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *ppos);
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/*
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* Generic implementation of bulk operations
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* These are useful for situations in which the allocator cannot
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* perform optimizations. In that case segments of the object listed
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* may be allocated or freed using these operations.
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*/
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void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);
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int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
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#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
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/* List of all root caches. */
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extern struct list_head slab_root_caches;
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#define root_caches_node memcg_params.__root_caches_node
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/*
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* Iterate over all memcg caches of the given root cache. The caller must hold
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* slab_mutex.
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*/
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#define for_each_memcg_cache(iter, root) \
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list_for_each_entry(iter, &(root)->memcg_params.children, \
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memcg_params.children_node)
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static inline bool is_root_cache(struct kmem_cache *s)
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{
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return !s->memcg_params.root_cache;
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}
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static inline bool slab_equal_or_root(struct kmem_cache *s,
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struct kmem_cache *p)
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{
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return p == s || p == s->memcg_params.root_cache;
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}
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/*
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* We use suffixes to the name in memcg because we can't have caches
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* created in the system with the same name. But when we print them
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* locally, better refer to them with the base name
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*/
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static inline const char *cache_name(struct kmem_cache *s)
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{
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if (!is_root_cache(s))
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s = s->memcg_params.root_cache;
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return s->name;
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}
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/*
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* Note, we protect with RCU only the memcg_caches array, not per-memcg caches.
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* That said the caller must assure the memcg's cache won't go away by either
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* taking a css reference to the owner cgroup, or holding the slab_mutex.
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*/
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static inline struct kmem_cache *
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cache_from_memcg_idx(struct kmem_cache *s, int idx)
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{
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struct kmem_cache *cachep;
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struct memcg_cache_array *arr;
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rcu_read_lock();
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arr = rcu_dereference(s->memcg_params.memcg_caches);
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/*
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* Make sure we will access the up-to-date value. The code updating
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* memcg_caches issues a write barrier to match this (see
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* memcg_create_kmem_cache()).
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*/
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cachep = lockless_dereference(arr->entries[idx]);
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rcu_read_unlock();
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return cachep;
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}
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static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
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{
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if (is_root_cache(s))
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return s;
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return s->memcg_params.root_cache;
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}
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static __always_inline int memcg_charge_slab(struct page *page,
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gfp_t gfp, int order,
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struct kmem_cache *s)
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{
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if (!memcg_kmem_enabled())
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return 0;
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if (is_root_cache(s))
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return 0;
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return memcg_kmem_charge_memcg(page, gfp, order, s->memcg_params.memcg);
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}
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static __always_inline void memcg_uncharge_slab(struct page *page, int order,
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struct kmem_cache *s)
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{
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if (!memcg_kmem_enabled())
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return;
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memcg_kmem_uncharge(page, order);
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}
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extern void slab_init_memcg_params(struct kmem_cache *);
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extern void memcg_link_cache(struct kmem_cache *s);
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extern void slab_deactivate_memcg_cache_rcu_sched(struct kmem_cache *s,
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void (*deact_fn)(struct kmem_cache *));
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#else /* CONFIG_MEMCG && !CONFIG_SLOB */
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/* If !memcg, all caches are root. */
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#define slab_root_caches slab_caches
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#define root_caches_node list
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#define for_each_memcg_cache(iter, root) \
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for ((void)(iter), (void)(root); 0; )
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static inline bool is_root_cache(struct kmem_cache *s)
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{
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return true;
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}
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static inline bool slab_equal_or_root(struct kmem_cache *s,
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struct kmem_cache *p)
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{
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return true;
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}
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static inline const char *cache_name(struct kmem_cache *s)
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{
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return s->name;
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}
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static inline struct kmem_cache *
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cache_from_memcg_idx(struct kmem_cache *s, int idx)
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{
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return NULL;
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}
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static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
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{
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return s;
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}
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static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order,
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struct kmem_cache *s)
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{
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return 0;
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}
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static inline void memcg_uncharge_slab(struct page *page, int order,
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struct kmem_cache *s)
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{
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}
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static inline void slab_init_memcg_params(struct kmem_cache *s)
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{
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}
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static inline void memcg_link_cache(struct kmem_cache *s)
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{
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}
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#endif /* CONFIG_MEMCG && !CONFIG_SLOB */
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static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
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{
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struct kmem_cache *cachep;
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struct page *page;
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/*
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* When kmemcg is not being used, both assignments should return the
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* same value. but we don't want to pay the assignment price in that
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* case. If it is not compiled in, the compiler should be smart enough
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* to not do even the assignment. In that case, slab_equal_or_root
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* will also be a constant.
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*/
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if (!memcg_kmem_enabled() &&
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!unlikely(s->flags & SLAB_CONSISTENCY_CHECKS))
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return s;
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page = virt_to_head_page(x);
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cachep = page->slab_cache;
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if (slab_equal_or_root(cachep, s))
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return cachep;
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pr_err("%s: Wrong slab cache. %s but object is from %s\n",
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__func__, s->name, cachep->name);
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WARN_ON_ONCE(1);
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return s;
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}
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static inline size_t slab_ksize(const struct kmem_cache *s)
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{
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#ifndef CONFIG_SLUB
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return s->object_size;
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#else /* CONFIG_SLUB */
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# ifdef CONFIG_SLUB_DEBUG
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/*
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* Debugging requires use of the padding between object
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* and whatever may come after it.
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*/
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if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
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return s->object_size;
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# endif
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if (s->flags & SLAB_KASAN)
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return s->object_size;
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/*
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* If we have the need to store the freelist pointer
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* back there or track user information then we can
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* only use the space before that information.
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*/
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if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER))
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return s->inuse;
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/*
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* Else we can use all the padding etc for the allocation
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*/
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return s->size;
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#endif
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}
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static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s,
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gfp_t flags)
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{
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flags &= gfp_allowed_mask;
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fs_reclaim_acquire(flags);
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fs_reclaim_release(flags);
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might_sleep_if(gfpflags_allow_blocking(flags));
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if (should_failslab(s, flags))
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return NULL;
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if (memcg_kmem_enabled() &&
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((flags & __GFP_ACCOUNT) || (s->flags & SLAB_ACCOUNT)))
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return memcg_kmem_get_cache(s);
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return s;
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}
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static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags,
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size_t size, void **p)
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{
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size_t i;
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flags &= gfp_allowed_mask;
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for (i = 0; i < size; i++) {
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void *object = p[i];
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kmemcheck_slab_alloc(s, flags, object, slab_ksize(s));
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kmemleak_alloc_recursive(object, s->object_size, 1,
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s->flags, flags);
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kasan_slab_alloc(s, object, flags);
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}
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if (memcg_kmem_enabled())
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memcg_kmem_put_cache(s);
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}
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#ifndef CONFIG_SLOB
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/*
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* The slab lists for all objects.
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*/
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struct kmem_cache_node {
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spinlock_t list_lock;
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#ifdef CONFIG_SLAB
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struct list_head slabs_partial; /* partial list first, better asm code */
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struct list_head slabs_full;
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struct list_head slabs_free;
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unsigned long total_slabs; /* length of all slab lists */
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unsigned long free_slabs; /* length of free slab list only */
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unsigned long free_objects;
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unsigned int free_limit;
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unsigned int colour_next; /* Per-node cache coloring */
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struct array_cache *shared; /* shared per node */
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struct alien_cache **alien; /* on other nodes */
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unsigned long next_reap; /* updated without locking */
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int free_touched; /* updated without locking */
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#endif
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#ifdef CONFIG_SLUB
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unsigned long nr_partial;
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struct list_head partial;
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#ifdef CONFIG_SLUB_DEBUG
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atomic_long_t nr_slabs;
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atomic_long_t total_objects;
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struct list_head full;
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#endif
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#endif
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};
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static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
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{
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return s->node[node];
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}
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/*
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* Iterator over all nodes. The body will be executed for each node that has
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* a kmem_cache_node structure allocated (which is true for all online nodes)
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*/
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#define for_each_kmem_cache_node(__s, __node, __n) \
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for (__node = 0; __node < nr_node_ids; __node++) \
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if ((__n = get_node(__s, __node)))
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#endif
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void *slab_start(struct seq_file *m, loff_t *pos);
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void *slab_next(struct seq_file *m, void *p, loff_t *pos);
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void slab_stop(struct seq_file *m, void *p);
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void *memcg_slab_start(struct seq_file *m, loff_t *pos);
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void *memcg_slab_next(struct seq_file *m, void *p, loff_t *pos);
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void memcg_slab_stop(struct seq_file *m, void *p);
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int memcg_slab_show(struct seq_file *m, void *p);
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void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr);
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#ifdef CONFIG_SLAB_FREELIST_RANDOM
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int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count,
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gfp_t gfp);
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void cache_random_seq_destroy(struct kmem_cache *cachep);
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#else
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static inline int cache_random_seq_create(struct kmem_cache *cachep,
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unsigned int count, gfp_t gfp)
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{
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return 0;
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}
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static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { }
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#endif /* CONFIG_SLAB_FREELIST_RANDOM */
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#endif /* MM_SLAB_H */
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