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mm/slab_common.c
24.1 KB
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/* * Slab allocator functions that are independent of the allocator strategy * * (C) 2012 Christoph Lameter <cl@linux.com> */ #include <linux/slab.h> #include <linux/mm.h> #include <linux/poison.h> #include <linux/interrupt.h> #include <linux/memory.h> #include <linux/compiler.h> #include <linux/module.h> |
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#include <linux/cpu.h> #include <linux/uaccess.h> |
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#include <linux/seq_file.h> #include <linux/proc_fs.h> |
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#include <asm/cacheflush.h> #include <asm/tlbflush.h> #include <asm/page.h> |
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#include <linux/memcontrol.h> |
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#define CREATE_TRACE_POINTS |
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#include <trace/events/kmem.h> |
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|
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#include "slab.h" enum slab_state slab_state; |
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LIST_HEAD(slab_caches); DEFINE_MUTEX(slab_mutex); |
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struct kmem_cache *kmem_cache; |
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|
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/* |
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* Set of flags that will prevent slab merging */ #define SLAB_NEVER_MERGE (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ SLAB_TRACE | SLAB_DESTROY_BY_RCU | SLAB_NOLEAKTRACE | \ SLAB_FAILSLAB) #define SLAB_MERGE_SAME (SLAB_DEBUG_FREE | SLAB_RECLAIM_ACCOUNT | \ SLAB_CACHE_DMA | SLAB_NOTRACK) /* * Merge control. If this is set then no merging of slab caches will occur. * (Could be removed. This was introduced to pacify the merge skeptics.) */ static int slab_nomerge; static int __init setup_slab_nomerge(char *str) { slab_nomerge = 1; return 1; } #ifdef CONFIG_SLUB __setup_param("slub_nomerge", slub_nomerge, setup_slab_nomerge, 0); #endif __setup("slab_nomerge", setup_slab_nomerge); /* |
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* Determine the size of a slab object */ unsigned int kmem_cache_size(struct kmem_cache *s) { return s->object_size; } EXPORT_SYMBOL(kmem_cache_size); |
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#ifdef CONFIG_DEBUG_VM |
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static int kmem_cache_sanity_check(const char *name, size_t size) |
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{ struct kmem_cache *s = NULL; |
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if (!name || in_interrupt() || size < sizeof(void *) || size > KMALLOC_MAX_SIZE) { |
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pr_err("kmem_cache_create(%s) integrity check failed ", name); return -EINVAL; |
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} |
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|
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list_for_each_entry(s, &slab_caches, list) { char tmp; int res; /* * This happens when the module gets unloaded and doesn't * destroy its slab cache and no-one else reuses the vmalloc * area of the module. Print a warning. */ res = probe_kernel_address(s->name, tmp); if (res) { |
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pr_err("Slab cache with size %d has lost its name ", |
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s->object_size); continue; } |
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} WARN_ON(strchr(name, ' ')); /* It confuses parsers */ |
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return 0; } #else |
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static inline int kmem_cache_sanity_check(const char *name, size_t size) |
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{ return 0; } |
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#endif |
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#ifdef CONFIG_MEMCG_KMEM |
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static int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s, struct kmem_cache *root_cache) { size_t size; if (!memcg_kmem_enabled()) return 0; if (!memcg) { size = offsetof(struct memcg_cache_params, memcg_caches); size += memcg_limited_groups_array_size * sizeof(void *); } else size = sizeof(struct memcg_cache_params); s->memcg_params = kzalloc(size, GFP_KERNEL); if (!s->memcg_params) return -ENOMEM; if (memcg) { s->memcg_params->memcg = memcg; s->memcg_params->root_cache = root_cache; } else s->memcg_params->is_root_cache = true; return 0; } static void memcg_free_cache_params(struct kmem_cache *s) { kfree(s->memcg_params); } |
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static int memcg_update_cache_params(struct kmem_cache *s, int num_memcgs) { int size; struct memcg_cache_params *new_params, *cur_params; BUG_ON(!is_root_cache(s)); size = offsetof(struct memcg_cache_params, memcg_caches); size += num_memcgs * sizeof(void *); new_params = kzalloc(size, GFP_KERNEL); if (!new_params) return -ENOMEM; cur_params = s->memcg_params; memcpy(new_params->memcg_caches, cur_params->memcg_caches, memcg_limited_groups_array_size * sizeof(void *)); new_params->is_root_cache = true; rcu_assign_pointer(s->memcg_params, new_params); if (cur_params) kfree_rcu(cur_params, rcu_head); return 0; } |
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int memcg_update_all_caches(int num_memcgs) { struct kmem_cache *s; int ret = 0; mutex_lock(&slab_mutex); list_for_each_entry(s, &slab_caches, list) { if (!is_root_cache(s)) continue; |
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ret = memcg_update_cache_params(s, num_memcgs); |
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/* |
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* Instead of freeing the memory, we'll just leave the caches * up to this point in an updated state. */ if (ret) goto out; } memcg_update_array_size(num_memcgs); out: mutex_unlock(&slab_mutex); return ret; } |
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#else static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s, struct kmem_cache *root_cache) { return 0; } static inline void memcg_free_cache_params(struct kmem_cache *s) { } #endif /* CONFIG_MEMCG_KMEM */ |
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|
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/* |
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* Find a mergeable slab cache */ int slab_unmergeable(struct kmem_cache *s) { if (slab_nomerge || (s->flags & SLAB_NEVER_MERGE)) return 1; if (!is_root_cache(s)) return 1; if (s->ctor) return 1; /* * We may have set a slab to be unmergeable during bootstrap. */ if (s->refcount < 0) return 1; return 0; } struct kmem_cache *find_mergeable(size_t size, size_t align, unsigned long flags, const char *name, void (*ctor)(void *)) { struct kmem_cache *s; if (slab_nomerge || (flags & SLAB_NEVER_MERGE)) return NULL; if (ctor) return NULL; size = ALIGN(size, sizeof(void *)); align = calculate_alignment(flags, align, size); size = ALIGN(size, align); flags = kmem_cache_flags(size, flags, name, NULL); |
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list_for_each_entry_reverse(s, &slab_caches, list) { |
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if (slab_unmergeable(s)) continue; if (size > s->size) continue; if ((flags & SLAB_MERGE_SAME) != (s->flags & SLAB_MERGE_SAME)) continue; /* * Check if alignment is compatible. * Courtesy of Adrian Drzewiecki */ if ((s->size & ~(align - 1)) != s->size) continue; if (s->size - size >= sizeof(void *)) continue; |
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if (IS_ENABLED(CONFIG_SLAB) && align && (align > s->align || s->align % align)) continue; |
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return s; } return NULL; } /* |
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* Figure out what the alignment of the objects will be given a set of * flags, a user specified alignment and the size of the objects. */ unsigned long calculate_alignment(unsigned long flags, unsigned long align, unsigned long size) { /* * If the user wants hardware cache aligned objects then follow that * suggestion if the object is sufficiently large. * * The hardware cache alignment cannot override the specified * alignment though. If that is greater then use it. */ if (flags & SLAB_HWCACHE_ALIGN) { unsigned long ralign = cache_line_size(); while (size <= ralign / 2) ralign /= 2; align = max(align, ralign); } if (align < ARCH_SLAB_MINALIGN) align = ARCH_SLAB_MINALIGN; return ALIGN(align, sizeof(void *)); } |
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static struct kmem_cache * do_kmem_cache_create(char *name, size_t object_size, size_t size, size_t align, unsigned long flags, void (*ctor)(void *), struct mem_cgroup *memcg, struct kmem_cache *root_cache) { struct kmem_cache *s; int err; err = -ENOMEM; s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL); if (!s) goto out; s->name = name; s->object_size = object_size; s->size = size; s->align = align; s->ctor = ctor; err = memcg_alloc_cache_params(memcg, s, root_cache); if (err) goto out_free_cache; err = __kmem_cache_create(s, flags); if (err) goto out_free_cache; s->refcount = 1; list_add(&s->list, &slab_caches); |
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out: if (err) return ERR_PTR(err); return s; out_free_cache: memcg_free_cache_params(s); kfree(s); goto out; } |
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/* |
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* kmem_cache_create - Create a cache. * @name: A string which is used in /proc/slabinfo to identify this cache. * @size: The size of objects to be created in this cache. * @align: The required alignment for the objects. * @flags: SLAB flags * @ctor: A constructor for the objects. * * Returns a ptr to the cache on success, NULL on failure. * Cannot be called within a interrupt, but can be interrupted. * The @ctor is run when new pages are allocated by the cache. * * The flags are * * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) * to catch references to uninitialised memory. * * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check * for buffer overruns. * * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware * cacheline. This can be beneficial if you're counting cycles as closely * as davem. */ |
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struct kmem_cache * |
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kmem_cache_create(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)) |
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{ |
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struct kmem_cache *s; char *cache_name; |
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int err; |
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|
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get_online_cpus(); |
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get_online_mems(); |
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mutex_lock(&slab_mutex); |
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|
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err = kmem_cache_sanity_check(name, size); |
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if (err) { s = NULL; /* suppress uninit var warning */ |
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goto out_unlock; |
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} |
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|
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/* * Some allocators will constraint the set of valid flags to a subset * of all flags. We expect them to define CACHE_CREATE_MASK in this * case, and we'll just provide them with a sanitized version of the * passed flags. */ flags &= CACHE_CREATE_MASK; |
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|
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s = __kmem_cache_alias(name, size, align, flags, ctor); if (s) |
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goto out_unlock; |
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|
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cache_name = kstrdup(name, GFP_KERNEL); if (!cache_name) { err = -ENOMEM; goto out_unlock; } |
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|
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s = do_kmem_cache_create(cache_name, size, size, calculate_alignment(flags, align, size), flags, ctor, NULL, NULL); if (IS_ERR(s)) { err = PTR_ERR(s); kfree(cache_name); } |
3965fc365 slab: clean up km... |
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out_unlock: |
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mutex_unlock(&slab_mutex); |
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put_online_mems(); |
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put_online_cpus(); |
ba3253c78 slab: fix wrong r... |
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if (err) { |
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if (flags & SLAB_PANIC) panic("kmem_cache_create: Failed to create slab '%s'. Error %d ", name, err); else { printk(KERN_WARNING "kmem_cache_create(%s) failed with error %d", name, err); dump_stack(); } |
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return NULL; } |
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return s; } |
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EXPORT_SYMBOL(kmem_cache_create); |
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|
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#ifdef CONFIG_MEMCG_KMEM /* |
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* memcg_create_kmem_cache - Create a cache for a memory cgroup. |
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* @memcg: The memory cgroup the new cache is for. * @root_cache: The parent of the new cache. |
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* @memcg_name: The name of the memory cgroup (used for naming the new cache). |
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* * This function attempts to create a kmem cache that will serve allocation * requests going from @memcg to @root_cache. The new cache inherits properties * from its parent. */ |
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struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg, |
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struct kmem_cache *root_cache, const char *memcg_name) |
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{ |
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struct kmem_cache *s = NULL; |
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char *cache_name; get_online_cpus(); |
03afc0e25 slab: get_online_... |
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get_online_mems(); |
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mutex_lock(&slab_mutex); |
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cache_name = kasprintf(GFP_KERNEL, "%s(%d:%s)", root_cache->name, memcg_cache_id(memcg), memcg_name); |
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if (!cache_name) goto out_unlock; s = do_kmem_cache_create(cache_name, root_cache->object_size, root_cache->size, root_cache->align, root_cache->flags, root_cache->ctor, memcg, root_cache); |
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if (IS_ERR(s)) { |
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kfree(cache_name); |
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s = NULL; } |
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out_unlock: mutex_unlock(&slab_mutex); |
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put_online_mems(); |
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put_online_cpus(); |
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return s; |
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} |
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|
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static int memcg_cleanup_cache_params(struct kmem_cache *s) |
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{ int rc; if (!s->memcg_params || !s->memcg_params->is_root_cache) return 0; mutex_unlock(&slab_mutex); |
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rc = __memcg_cleanup_cache_params(s); |
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mutex_lock(&slab_mutex); return rc; } #else |
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static int memcg_cleanup_cache_params(struct kmem_cache *s) |
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{ return 0; } |
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#endif /* CONFIG_MEMCG_KMEM */ |
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|
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void slab_kmem_cache_release(struct kmem_cache *s) { kfree(s->name); kmem_cache_free(kmem_cache, s); } |
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void kmem_cache_destroy(struct kmem_cache *s) { get_online_cpus(); |
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get_online_mems(); |
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mutex_lock(&slab_mutex); |
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|
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s->refcount--; |
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if (s->refcount) goto out_unlock; |
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if (memcg_cleanup_cache_params(s) != 0) |
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goto out_unlock; |
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if (__kmem_cache_shutdown(s) != 0) { |
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printk(KERN_ERR "kmem_cache_destroy %s: " "Slab cache still has objects ", s->name); dump_stack(); goto out_unlock; |
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} |
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|
0bd62b119 slab: delete cach... |
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list_del(&s->list); |
b8529907b memcg, slab: do n... |
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mutex_unlock(&slab_mutex); if (s->flags & SLAB_DESTROY_BY_RCU) rcu_barrier(); memcg_free_cache_params(s); |
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#ifdef SLAB_SUPPORTS_SYSFS sysfs_slab_remove(s); #else slab_kmem_cache_release(s); #endif |
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goto out; |
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out_unlock: mutex_unlock(&slab_mutex); |
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out: put_online_mems(); |
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put_online_cpus(); } EXPORT_SYMBOL(kmem_cache_destroy); |
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/** * kmem_cache_shrink - Shrink a cache. * @cachep: The cache to shrink. * * Releases as many slabs as possible for a cache. * To help debugging, a zero exit status indicates all slabs were released. */ int kmem_cache_shrink(struct kmem_cache *cachep) { int ret; get_online_cpus(); get_online_mems(); ret = __kmem_cache_shrink(cachep); put_online_mems(); put_online_cpus(); return ret; } EXPORT_SYMBOL(kmem_cache_shrink); |
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int slab_is_available(void) { return slab_state >= UP; } |
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|
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#ifndef CONFIG_SLOB /* Create a cache during boot when no slab services are available yet */ void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t size, unsigned long flags) { int err; s->name = name; s->size = s->object_size = size; |
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s->align = calculate_alignment(flags, ARCH_KMALLOC_MINALIGN, size); |
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err = __kmem_cache_create(s, flags); if (err) |
31ba7346f slab: Use proper ... |
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panic("Creation of kmalloc slab %s size=%zu failed. Reason %d ", |
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name, size, err); s->refcount = -1; /* Exempt from merging for now */ } struct kmem_cache *__init create_kmalloc_cache(const char *name, size_t size, unsigned long flags) { struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); if (!s) panic("Out of memory when creating slab %s ", name); create_boot_cache(s, name, size, flags); list_add(&s->list, &slab_caches); s->refcount = 1; return s; } |
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struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1]; EXPORT_SYMBOL(kmalloc_caches); #ifdef CONFIG_ZONE_DMA struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1]; EXPORT_SYMBOL(kmalloc_dma_caches); #endif |
f97d5f634 slab: Common func... |
593 |
/* |
2c59dd654 slab: Common Kmal... |
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* Conversion table for small slabs sizes / 8 to the index in the * kmalloc array. This is necessary for slabs < 192 since we have non power * of two cache sizes there. The size of larger slabs can be determined using * fls. */ static s8 size_index[24] = { 3, /* 8 */ 4, /* 16 */ 5, /* 24 */ 5, /* 32 */ 6, /* 40 */ 6, /* 48 */ 6, /* 56 */ 6, /* 64 */ 1, /* 72 */ 1, /* 80 */ 1, /* 88 */ 1, /* 96 */ 7, /* 104 */ 7, /* 112 */ 7, /* 120 */ 7, /* 128 */ 2, /* 136 */ 2, /* 144 */ 2, /* 152 */ 2, /* 160 */ 2, /* 168 */ 2, /* 176 */ 2, /* 184 */ 2 /* 192 */ }; static inline int size_index_elem(size_t bytes) { return (bytes - 1) / 8; } /* * Find the kmem_cache structure that serves a given size of * allocation */ struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags) { int index; |
9de1bc875 mm, slab_common: ... |
638 |
if (unlikely(size > KMALLOC_MAX_SIZE)) { |
907985f48 slab: prevent war... |
639 |
WARN_ON_ONCE(!(flags & __GFP_NOWARN)); |
6286ae97d slab: Return NULL... |
640 |
return NULL; |
907985f48 slab: prevent war... |
641 |
} |
6286ae97d slab: Return NULL... |
642 |
|
2c59dd654 slab: Common Kmal... |
643 644 645 646 647 648 649 650 651 |
if (size <= 192) { if (!size) return ZERO_SIZE_PTR; index = size_index[size_index_elem(size)]; } else index = fls(size - 1); #ifdef CONFIG_ZONE_DMA |
b1e054167 mm/sl[au]b: corre... |
652 |
if (unlikely((flags & GFP_DMA))) |
2c59dd654 slab: Common Kmal... |
653 654 655 656 657 658 659 |
return kmalloc_dma_caches[index]; #endif return kmalloc_caches[index]; } /* |
f97d5f634 slab: Common func... |
660 661 662 663 664 665 666 |
* Create the kmalloc array. Some of the regular kmalloc arrays * may already have been created because they were needed to * enable allocations for slab creation. */ void __init create_kmalloc_caches(unsigned long flags) { int i; |
2c59dd654 slab: Common Kmal... |
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 |
/* * Patch up the size_index table if we have strange large alignment * requirements for the kmalloc array. This is only the case for * MIPS it seems. The standard arches will not generate any code here. * * Largest permitted alignment is 256 bytes due to the way we * handle the index determination for the smaller caches. * * Make sure that nothing crazy happens if someone starts tinkering * around with ARCH_KMALLOC_MINALIGN */ BUILD_BUG_ON(KMALLOC_MIN_SIZE > 256 || (KMALLOC_MIN_SIZE & (KMALLOC_MIN_SIZE - 1))); for (i = 8; i < KMALLOC_MIN_SIZE; i += 8) { int elem = size_index_elem(i); if (elem >= ARRAY_SIZE(size_index)) break; size_index[elem] = KMALLOC_SHIFT_LOW; } if (KMALLOC_MIN_SIZE >= 64) { /* * The 96 byte size cache is not used if the alignment * is 64 byte. */ for (i = 64 + 8; i <= 96; i += 8) size_index[size_index_elem(i)] = 7; } if (KMALLOC_MIN_SIZE >= 128) { /* * The 192 byte sized cache is not used if the alignment * is 128 byte. Redirect kmalloc to use the 256 byte cache * instead. */ for (i = 128 + 8; i <= 192; i += 8) size_index[size_index_elem(i)] = 8; } |
8a965b3ba mm, slab_common: ... |
708 709 |
for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) { if (!kmalloc_caches[i]) { |
f97d5f634 slab: Common func... |
710 711 |
kmalloc_caches[i] = create_kmalloc_cache(NULL, 1 << i, flags); |
956e46efb mm/slab: Fix cras... |
712 |
} |
f97d5f634 slab: Common func... |
713 |
|
956e46efb mm/slab: Fix cras... |
714 715 716 717 718 719 720 |
/* * Caches that are not of the two-to-the-power-of size. * These have to be created immediately after the * earlier power of two caches */ if (KMALLOC_MIN_SIZE <= 32 && !kmalloc_caches[1] && i == 6) kmalloc_caches[1] = create_kmalloc_cache(NULL, 96, flags); |
8a965b3ba mm, slab_common: ... |
721 |
|
956e46efb mm/slab: Fix cras... |
722 723 |
if (KMALLOC_MIN_SIZE <= 64 && !kmalloc_caches[2] && i == 7) kmalloc_caches[2] = create_kmalloc_cache(NULL, 192, flags); |
8a965b3ba mm, slab_common: ... |
724 |
} |
f97d5f634 slab: Common func... |
725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 |
/* Kmalloc array is now usable */ slab_state = UP; for (i = 0; i <= KMALLOC_SHIFT_HIGH; i++) { struct kmem_cache *s = kmalloc_caches[i]; char *n; if (s) { n = kasprintf(GFP_NOWAIT, "kmalloc-%d", kmalloc_size(i)); BUG_ON(!n); s->name = n; } } #ifdef CONFIG_ZONE_DMA for (i = 0; i <= KMALLOC_SHIFT_HIGH; i++) { struct kmem_cache *s = kmalloc_caches[i]; if (s) { int size = kmalloc_size(i); char *n = kasprintf(GFP_NOWAIT, "dma-kmalloc-%d", size); BUG_ON(!n); kmalloc_dma_caches[i] = create_kmalloc_cache(n, size, SLAB_CACHE_DMA | flags); } } #endif } |
45530c447 mm, sl[au]b: crea... |
756 |
#endif /* !CONFIG_SLOB */ |
cea371f4f slab: document km... |
757 758 759 760 761 |
/* * To avoid unnecessary overhead, we pass through large allocation requests * directly to the page allocator. We use __GFP_COMP, because we will need to * know the allocation order to free the pages properly in kfree. */ |
52383431b mm: get rid of __... |
762 763 764 765 766 767 768 769 770 771 772 773 |
void *kmalloc_order(size_t size, gfp_t flags, unsigned int order) { void *ret; struct page *page; flags |= __GFP_COMP; page = alloc_kmem_pages(flags, order); ret = page ? page_address(page) : NULL; kmemleak_alloc(ret, size, 1, flags); return ret; } EXPORT_SYMBOL(kmalloc_order); |
f1b6eb6e6 mm/sl[aou]b: Move... |
774 775 776 777 778 779 780 781 782 |
#ifdef CONFIG_TRACING void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) { void *ret = kmalloc_order(size, flags, order); trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << order, flags); return ret; } EXPORT_SYMBOL(kmalloc_order_trace); #endif |
45530c447 mm, sl[au]b: crea... |
783 |
|
b7454ad3c mm/sl[au]b: Move ... |
784 |
#ifdef CONFIG_SLABINFO |
e9b4db2b8 mm/slab: Fix /pro... |
785 786 787 788 789 790 |
#ifdef CONFIG_SLAB #define SLABINFO_RIGHTS (S_IWUSR | S_IRUSR) #else #define SLABINFO_RIGHTS S_IRUSR #endif |
b047501cd memcg: use generi... |
791 |
static void print_slabinfo_header(struct seq_file *m) |
bcee6e2a1 mm/sl[au]b: Move ... |
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{ /* * Output format version, so at least we can change it * without _too_ many complaints. */ #ifdef CONFIG_DEBUG_SLAB seq_puts(m, "slabinfo - version: 2.1 (statistics) "); #else seq_puts(m, "slabinfo - version: 2.1 "); #endif seq_puts(m, "# name <active_objs> <num_objs> <objsize> " "<objperslab> <pagesperslab>"); seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>"); seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>"); #ifdef CONFIG_DEBUG_SLAB seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped> " "<error> <maxfreeable> <nodeallocs> <remotefrees> <alienoverflow>"); seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>"); #endif seq_putc(m, ' '); } |
1df3b26f2 slab: print slabi... |
816 |
void *slab_start(struct seq_file *m, loff_t *pos) |
b7454ad3c mm/sl[au]b: Move ... |
817 |
{ |
b7454ad3c mm/sl[au]b: Move ... |
818 |
mutex_lock(&slab_mutex); |
b7454ad3c mm/sl[au]b: Move ... |
819 820 |
return seq_list_start(&slab_caches, *pos); } |
276a2439c mm/slab: Give s_n... |
821 |
void *slab_next(struct seq_file *m, void *p, loff_t *pos) |
b7454ad3c mm/sl[au]b: Move ... |
822 823 824 |
{ return seq_list_next(p, &slab_caches, pos); } |
276a2439c mm/slab: Give s_n... |
825 |
void slab_stop(struct seq_file *m, void *p) |
b7454ad3c mm/sl[au]b: Move ... |
826 827 828 |
{ mutex_unlock(&slab_mutex); } |
749c54151 memcg: aggregate ... |
829 830 831 832 833 834 835 836 837 838 839 |
static void memcg_accumulate_slabinfo(struct kmem_cache *s, struct slabinfo *info) { struct kmem_cache *c; struct slabinfo sinfo; int i; if (!is_root_cache(s)) return; for_each_memcg_cache_index(i) { |
2ade4de87 memcg, kmem: rena... |
840 |
c = cache_from_memcg_idx(s, i); |
749c54151 memcg: aggregate ... |
841 842 843 844 845 846 847 848 849 850 851 852 853 |
if (!c) continue; memset(&sinfo, 0, sizeof(sinfo)); get_slabinfo(c, &sinfo); info->active_slabs += sinfo.active_slabs; info->num_slabs += sinfo.num_slabs; info->shared_avail += sinfo.shared_avail; info->active_objs += sinfo.active_objs; info->num_objs += sinfo.num_objs; } } |
b047501cd memcg: use generi... |
854 |
static void cache_show(struct kmem_cache *s, struct seq_file *m) |
b7454ad3c mm/sl[au]b: Move ... |
855 |
{ |
0d7561c61 sl[au]b: Process ... |
856 857 858 859 |
struct slabinfo sinfo; memset(&sinfo, 0, sizeof(sinfo)); get_slabinfo(s, &sinfo); |
749c54151 memcg: aggregate ... |
860 |
memcg_accumulate_slabinfo(s, &sinfo); |
0d7561c61 sl[au]b: Process ... |
861 |
seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", |
749c54151 memcg: aggregate ... |
862 |
cache_name(s), sinfo.active_objs, sinfo.num_objs, s->size, |
0d7561c61 sl[au]b: Process ... |
863 864 865 866 867 868 869 870 871 |
sinfo.objects_per_slab, (1 << sinfo.cache_order)); seq_printf(m, " : tunables %4u %4u %4u", sinfo.limit, sinfo.batchcount, sinfo.shared); seq_printf(m, " : slabdata %6lu %6lu %6lu", sinfo.active_slabs, sinfo.num_slabs, sinfo.shared_avail); slabinfo_show_stats(m, s); seq_putc(m, ' '); |
b7454ad3c mm/sl[au]b: Move ... |
872 |
} |
1df3b26f2 slab: print slabi... |
873 |
static int slab_show(struct seq_file *m, void *p) |
749c54151 memcg: aggregate ... |
874 875 |
{ struct kmem_cache *s = list_entry(p, struct kmem_cache, list); |
1df3b26f2 slab: print slabi... |
876 877 |
if (p == slab_caches.next) print_slabinfo_header(m); |
b047501cd memcg: use generi... |
878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 |
if (is_root_cache(s)) cache_show(s, m); return 0; } #ifdef CONFIG_MEMCG_KMEM int memcg_slab_show(struct seq_file *m, void *p) { struct kmem_cache *s = list_entry(p, struct kmem_cache, list); struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m)); if (p == slab_caches.next) print_slabinfo_header(m); if (!is_root_cache(s) && s->memcg_params->memcg == memcg) cache_show(s, m); return 0; |
749c54151 memcg: aggregate ... |
894 |
} |
b047501cd memcg: use generi... |
895 |
#endif |
749c54151 memcg: aggregate ... |
896 |
|
b7454ad3c mm/sl[au]b: Move ... |
897 898 899 900 901 902 903 904 905 906 907 908 909 910 |
/* * slabinfo_op - iterator that generates /proc/slabinfo * * Output layout: * cache-name * num-active-objs * total-objs * object size * num-active-slabs * total-slabs * num-pages-per-slab * + further values on SMP and with statistics enabled */ static const struct seq_operations slabinfo_op = { |
1df3b26f2 slab: print slabi... |
911 |
.start = slab_start, |
276a2439c mm/slab: Give s_n... |
912 913 |
.next = slab_next, .stop = slab_stop, |
1df3b26f2 slab: print slabi... |
914 |
.show = slab_show, |
b7454ad3c mm/sl[au]b: Move ... |
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 |
}; static int slabinfo_open(struct inode *inode, struct file *file) { return seq_open(file, &slabinfo_op); } static const struct file_operations proc_slabinfo_operations = { .open = slabinfo_open, .read = seq_read, .write = slabinfo_write, .llseek = seq_lseek, .release = seq_release, }; static int __init slab_proc_init(void) { |
e9b4db2b8 mm/slab: Fix /pro... |
932 933 |
proc_create("slabinfo", SLABINFO_RIGHTS, NULL, &proc_slabinfo_operations); |
b7454ad3c mm/sl[au]b: Move ... |
934 935 936 937 |
return 0; } module_init(slab_proc_init); #endif /* CONFIG_SLABINFO */ |
928cec9cd mm: move slab rel... |
938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 |
static __always_inline void *__do_krealloc(const void *p, size_t new_size, gfp_t flags) { void *ret; size_t ks = 0; if (p) ks = ksize(p); if (ks >= new_size) return (void *)p; ret = kmalloc_track_caller(new_size, flags); if (ret && p) memcpy(ret, p, ks); return ret; } /** * __krealloc - like krealloc() but don't free @p. * @p: object to reallocate memory for. * @new_size: how many bytes of memory are required. * @flags: the type of memory to allocate. * * This function is like krealloc() except it never frees the originally * allocated buffer. Use this if you don't want to free the buffer immediately * like, for example, with RCU. */ void *__krealloc(const void *p, size_t new_size, gfp_t flags) { if (unlikely(!new_size)) return ZERO_SIZE_PTR; return __do_krealloc(p, new_size, flags); } EXPORT_SYMBOL(__krealloc); /** * krealloc - reallocate memory. The contents will remain unchanged. * @p: object to reallocate memory for. * @new_size: how many bytes of memory are required. * @flags: the type of memory to allocate. * * The contents of the object pointed to are preserved up to the * lesser of the new and old sizes. If @p is %NULL, krealloc() * behaves exactly like kmalloc(). If @new_size is 0 and @p is not a * %NULL pointer, the object pointed to is freed. */ void *krealloc(const void *p, size_t new_size, gfp_t flags) { void *ret; if (unlikely(!new_size)) { kfree(p); return ZERO_SIZE_PTR; } ret = __do_krealloc(p, new_size, flags); if (ret && p != ret) kfree(p); return ret; } EXPORT_SYMBOL(krealloc); /** * kzfree - like kfree but zero memory * @p: object to free memory of * * The memory of the object @p points to is zeroed before freed. * If @p is %NULL, kzfree() does nothing. * * Note: this function zeroes the whole allocated buffer which can be a good * deal bigger than the requested buffer size passed to kmalloc(). So be * careful when using this function in performance sensitive code. */ void kzfree(const void *p) { size_t ks; void *mem = (void *)p; if (unlikely(ZERO_OR_NULL_PTR(mem))) return; ks = ksize(mem); memset(mem, 0, ks); kfree(mem); } EXPORT_SYMBOL(kzfree); /* Tracepoints definitions. */ EXPORT_TRACEPOINT_SYMBOL(kmalloc); EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc); EXPORT_TRACEPOINT_SYMBOL(kmalloc_node); EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc_node); EXPORT_TRACEPOINT_SYMBOL(kfree); EXPORT_TRACEPOINT_SYMBOL(kmem_cache_free); |