Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 2 | * Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk). |
| 3 | * |
Christoph Lameter | cde5353 | 2008-07-04 09:59:22 -0700 | [diff] [blame] | 4 | * (C) SGI 2006, Christoph Lameter |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 5 | * Cleaned up and restructured to ease the addition of alternative |
| 6 | * implementations of SLAB allocators. |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 7 | * (C) Linux Foundation 2008-2013 |
| 8 | * Unified interface for all slab allocators |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #ifndef _LINUX_SLAB_H |
| 12 | #define _LINUX_SLAB_H |
| 13 | |
Andrew Morton | 1b1cec4 | 2006-12-06 20:33:22 -0800 | [diff] [blame] | 14 | #include <linux/gfp.h> |
Andrew Morton | 1b1cec4 | 2006-12-06 20:33:22 -0800 | [diff] [blame] | 15 | #include <linux/types.h> |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 16 | #include <linux/workqueue.h> |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 19 | /* |
| 20 | * Flags to pass to kmem_cache_create(). |
| 21 | * The ones marked DEBUG are only valid if CONFIG_SLAB_DEBUG is set. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | */ |
Christoph Lameter | 55935a3 | 2006-12-13 00:34:24 -0800 | [diff] [blame] | 23 | #define SLAB_DEBUG_FREE 0x00000100UL /* DEBUG: Perform (expensive) checks on free */ |
Christoph Lameter | 55935a3 | 2006-12-13 00:34:24 -0800 | [diff] [blame] | 24 | #define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */ |
| 25 | #define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */ |
| 26 | #define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */ |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 27 | #define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */ |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 28 | #define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */ |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 29 | #define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */ |
Peter Zijlstra | d7de4c1 | 2008-11-13 20:40:12 +0200 | [diff] [blame] | 30 | /* |
| 31 | * SLAB_DESTROY_BY_RCU - **WARNING** READ THIS! |
| 32 | * |
| 33 | * This delays freeing the SLAB page by a grace period, it does _NOT_ |
| 34 | * delay object freeing. This means that if you do kmem_cache_free() |
| 35 | * that memory location is free to be reused at any time. Thus it may |
| 36 | * be possible to see another object there in the same RCU grace period. |
| 37 | * |
| 38 | * This feature only ensures the memory location backing the object |
| 39 | * stays valid, the trick to using this is relying on an independent |
| 40 | * object validation pass. Something like: |
| 41 | * |
| 42 | * rcu_read_lock() |
| 43 | * again: |
| 44 | * obj = lockless_lookup(key); |
| 45 | * if (obj) { |
| 46 | * if (!try_get_ref(obj)) // might fail for free objects |
| 47 | * goto again; |
| 48 | * |
| 49 | * if (obj->key != key) { // not the object we expected |
| 50 | * put_ref(obj); |
| 51 | * goto again; |
| 52 | * } |
| 53 | * } |
| 54 | * rcu_read_unlock(); |
| 55 | * |
Joonsoo Kim | 6812670 | 2013-10-24 10:07:42 +0900 | [diff] [blame] | 56 | * This is useful if we need to approach a kernel structure obliquely, |
| 57 | * from its address obtained without the usual locking. We can lock |
| 58 | * the structure to stabilize it and check it's still at the given address, |
| 59 | * only if we can be sure that the memory has not been meanwhile reused |
| 60 | * for some other kind of object (which our subsystem's lock might corrupt). |
| 61 | * |
| 62 | * rcu_read_lock before reading the address, then rcu_read_unlock after |
| 63 | * taking the spinlock within the structure expected at that address. |
Peter Zijlstra | d7de4c1 | 2008-11-13 20:40:12 +0200 | [diff] [blame] | 64 | */ |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 65 | #define SLAB_DESTROY_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */ |
Paul Jackson | 101a500 | 2006-03-24 03:16:07 -0800 | [diff] [blame] | 66 | #define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 67 | #define SLAB_TRACE 0x00200000UL /* Trace allocations and frees */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Thomas Gleixner | 30327ac | 2008-04-30 00:54:59 -0700 | [diff] [blame] | 69 | /* Flag to prevent checks on free */ |
| 70 | #ifdef CONFIG_DEBUG_OBJECTS |
| 71 | # define SLAB_DEBUG_OBJECTS 0x00400000UL |
| 72 | #else |
| 73 | # define SLAB_DEBUG_OBJECTS 0x00000000UL |
| 74 | #endif |
| 75 | |
Catalin Marinas | d5cff63 | 2009-06-11 13:22:40 +0100 | [diff] [blame] | 76 | #define SLAB_NOLEAKTRACE 0x00800000UL /* Avoid kmemleak tracing */ |
| 77 | |
Vegard Nossum | 2dff440 | 2008-05-31 15:56:17 +0200 | [diff] [blame] | 78 | /* Don't track use of uninitialized memory */ |
| 79 | #ifdef CONFIG_KMEMCHECK |
| 80 | # define SLAB_NOTRACK 0x01000000UL |
| 81 | #else |
| 82 | # define SLAB_NOTRACK 0x00000000UL |
| 83 | #endif |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 84 | #ifdef CONFIG_FAILSLAB |
| 85 | # define SLAB_FAILSLAB 0x02000000UL /* Fault injection mark */ |
| 86 | #else |
| 87 | # define SLAB_FAILSLAB 0x00000000UL |
| 88 | #endif |
Vegard Nossum | 2dff440 | 2008-05-31 15:56:17 +0200 | [diff] [blame] | 89 | |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 90 | /* The following flags affect the page allocator grouping pages by mobility */ |
| 91 | #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */ |
| 92 | #define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */ |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 93 | /* |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 94 | * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests. |
| 95 | * |
| 96 | * Dereferencing ZERO_SIZE_PTR will lead to a distinct access fault. |
| 97 | * |
| 98 | * ZERO_SIZE_PTR can be passed to kfree though in the same way that NULL can. |
| 99 | * Both make kfree a no-op. |
| 100 | */ |
| 101 | #define ZERO_SIZE_PTR ((void *)16) |
| 102 | |
Roland Dreier | 1d4ec7b | 2007-07-20 12:13:20 -0700 | [diff] [blame] | 103 | #define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) <= \ |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 104 | (unsigned long)ZERO_SIZE_PTR) |
| 105 | |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 106 | #include <linux/kmemleak.h> |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 107 | |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 108 | struct mem_cgroup; |
Christoph Lameter | 3b0efdf | 2012-06-13 10:24:57 -0500 | [diff] [blame] | 109 | /* |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 110 | * struct kmem_cache related prototypes |
| 111 | */ |
| 112 | void __init kmem_cache_init(void); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 113 | int slab_is_available(void); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 114 | |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 115 | struct kmem_cache *kmem_cache_create(const char *, size_t, size_t, |
Christoph Lameter | ebe2973 | 2006-12-06 20:32:59 -0800 | [diff] [blame] | 116 | unsigned long, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 117 | void (*)(void *)); |
Vladimir Davydov | 794b124 | 2014-04-07 15:39:26 -0700 | [diff] [blame] | 118 | #ifdef CONFIG_MEMCG_KMEM |
Vladimir Davydov | bd67314 | 2014-06-04 16:07:40 -0700 | [diff] [blame] | 119 | struct kmem_cache *kmem_cache_create_memcg(struct mem_cgroup *, |
Vladimir Davydov | 073ee1c | 2014-06-04 16:08:23 -0700 | [diff] [blame^] | 120 | struct kmem_cache *, |
| 121 | const char *); |
Vladimir Davydov | 794b124 | 2014-04-07 15:39:26 -0700 | [diff] [blame] | 122 | #endif |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 123 | void kmem_cache_destroy(struct kmem_cache *); |
| 124 | int kmem_cache_shrink(struct kmem_cache *); |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 125 | void kmem_cache_free(struct kmem_cache *, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Christoph Lameter | 0a31bd5 | 2007-05-06 14:49:57 -0700 | [diff] [blame] | 127 | /* |
| 128 | * Please use this macro to create slab caches. Simply specify the |
| 129 | * name of the structure and maybe some flags that are listed above. |
| 130 | * |
| 131 | * The alignment of the struct determines object alignment. If you |
| 132 | * f.e. add ____cacheline_aligned_in_smp to the struct declaration |
| 133 | * then the objects will be properly aligned in SMP configurations. |
| 134 | */ |
| 135 | #define KMEM_CACHE(__struct, __flags) kmem_cache_create(#__struct,\ |
| 136 | sizeof(struct __struct), __alignof__(struct __struct),\ |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 137 | (__flags), NULL) |
Christoph Lameter | 0a31bd5 | 2007-05-06 14:49:57 -0700 | [diff] [blame] | 138 | |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 139 | /* |
Christoph Lameter | 3450466 | 2013-01-10 19:00:53 +0000 | [diff] [blame] | 140 | * Common kmalloc functions provided by all allocators |
| 141 | */ |
| 142 | void * __must_check __krealloc(const void *, size_t, gfp_t); |
| 143 | void * __must_check krealloc(const void *, size_t, gfp_t); |
| 144 | void kfree(const void *); |
| 145 | void kzfree(const void *); |
| 146 | size_t ksize(const void *); |
| 147 | |
Christoph Lameter | c601fd6 | 2013-02-05 16:36:47 +0000 | [diff] [blame] | 148 | /* |
| 149 | * Some archs want to perform DMA into kmalloc caches and need a guaranteed |
| 150 | * alignment larger than the alignment of a 64-bit integer. |
| 151 | * Setting ARCH_KMALLOC_MINALIGN in arch headers allows that. |
| 152 | */ |
| 153 | #if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8 |
| 154 | #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN |
| 155 | #define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN |
| 156 | #define KMALLOC_SHIFT_LOW ilog2(ARCH_DMA_MINALIGN) |
| 157 | #else |
| 158 | #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) |
| 159 | #endif |
| 160 | |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 161 | #ifdef CONFIG_SLOB |
| 162 | /* |
| 163 | * Common fields provided in kmem_cache by all slab allocators |
| 164 | * This struct is either used directly by the allocator (SLOB) |
| 165 | * or the allocator must include definitions for all fields |
| 166 | * provided in kmem_cache_common in their definition of kmem_cache. |
| 167 | * |
| 168 | * Once we can do anonymous structs (C11 standard) we could put a |
| 169 | * anonymous struct definition in these allocators so that the |
| 170 | * separate allocations in the kmem_cache structure of SLAB and |
| 171 | * SLUB is no longer needed. |
| 172 | */ |
| 173 | struct kmem_cache { |
| 174 | unsigned int object_size;/* The original size of the object */ |
| 175 | unsigned int size; /* The aligned/padded/added on size */ |
| 176 | unsigned int align; /* Alignment as calculated */ |
| 177 | unsigned long flags; /* Active flags on the slab */ |
| 178 | const char *name; /* Slab name for sysfs */ |
| 179 | int refcount; /* Use counter */ |
| 180 | void (*ctor)(void *); /* Called on object slot creation */ |
| 181 | struct list_head list; /* List of all slab caches on the system */ |
| 182 | }; |
| 183 | |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 184 | #endif /* CONFIG_SLOB */ |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 185 | |
Christoph Lameter | 3450466 | 2013-01-10 19:00:53 +0000 | [diff] [blame] | 186 | /* |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 187 | * Kmalloc array related definitions |
| 188 | */ |
| 189 | |
| 190 | #ifdef CONFIG_SLAB |
| 191 | /* |
| 192 | * The largest kmalloc size supported by the SLAB allocators is |
Christoph Lameter | 0aa817f | 2007-05-16 22:11:01 -0700 | [diff] [blame] | 193 | * 32 megabyte (2^25) or the maximum allocatable page order if that is |
| 194 | * less than 32 MB. |
| 195 | * |
| 196 | * WARNING: Its not easy to increase this value since the allocators have |
| 197 | * to do various tricks to work around compiler limitations in order to |
| 198 | * ensure proper constant folding. |
| 199 | */ |
Christoph Lameter | debee07 | 2007-06-23 17:16:43 -0700 | [diff] [blame] | 200 | #define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \ |
| 201 | (MAX_ORDER + PAGE_SHIFT - 1) : 25) |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 202 | #define KMALLOC_SHIFT_MAX KMALLOC_SHIFT_HIGH |
Christoph Lameter | c601fd6 | 2013-02-05 16:36:47 +0000 | [diff] [blame] | 203 | #ifndef KMALLOC_SHIFT_LOW |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 204 | #define KMALLOC_SHIFT_LOW 5 |
Christoph Lameter | c601fd6 | 2013-02-05 16:36:47 +0000 | [diff] [blame] | 205 | #endif |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 206 | #endif |
| 207 | |
| 208 | #ifdef CONFIG_SLUB |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 209 | /* |
Dave Hansen | 433a91f | 2014-01-28 14:24:50 -0800 | [diff] [blame] | 210 | * SLUB directly allocates requests fitting in to an order-1 page |
| 211 | * (PAGE_SIZE*2). Larger requests are passed to the page allocator. |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 212 | */ |
| 213 | #define KMALLOC_SHIFT_HIGH (PAGE_SHIFT + 1) |
| 214 | #define KMALLOC_SHIFT_MAX (MAX_ORDER + PAGE_SHIFT) |
Christoph Lameter | c601fd6 | 2013-02-05 16:36:47 +0000 | [diff] [blame] | 215 | #ifndef KMALLOC_SHIFT_LOW |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 216 | #define KMALLOC_SHIFT_LOW 3 |
| 217 | #endif |
Christoph Lameter | c601fd6 | 2013-02-05 16:36:47 +0000 | [diff] [blame] | 218 | #endif |
Christoph Lameter | 0aa817f | 2007-05-16 22:11:01 -0700 | [diff] [blame] | 219 | |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 220 | #ifdef CONFIG_SLOB |
| 221 | /* |
Dave Hansen | 433a91f | 2014-01-28 14:24:50 -0800 | [diff] [blame] | 222 | * SLOB passes all requests larger than one page to the page allocator. |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 223 | * No kmalloc array is necessary since objects of different sizes can |
| 224 | * be allocated from the same page. |
| 225 | */ |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 226 | #define KMALLOC_SHIFT_HIGH PAGE_SHIFT |
Dave Hansen | 433a91f | 2014-01-28 14:24:50 -0800 | [diff] [blame] | 227 | #define KMALLOC_SHIFT_MAX 30 |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 228 | #ifndef KMALLOC_SHIFT_LOW |
| 229 | #define KMALLOC_SHIFT_LOW 3 |
| 230 | #endif |
| 231 | #endif |
| 232 | |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 233 | /* Maximum allocatable size */ |
| 234 | #define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_MAX) |
| 235 | /* Maximum size for which we actually use a slab cache */ |
| 236 | #define KMALLOC_MAX_CACHE_SIZE (1UL << KMALLOC_SHIFT_HIGH) |
| 237 | /* Maximum order allocatable via the slab allocagtor */ |
| 238 | #define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_MAX - PAGE_SHIFT) |
Christoph Lameter | 0aa817f | 2007-05-16 22:11:01 -0700 | [diff] [blame] | 239 | |
Christoph Lameter | 9081064 | 2011-06-23 09:36:12 -0500 | [diff] [blame] | 240 | /* |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 241 | * Kmalloc subsystem. |
| 242 | */ |
Christoph Lameter | c601fd6 | 2013-02-05 16:36:47 +0000 | [diff] [blame] | 243 | #ifndef KMALLOC_MIN_SIZE |
Christoph Lameter | 95a05b4 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 244 | #define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_LOW) |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 245 | #endif |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 246 | |
Joonsoo Kim | 24f870d | 2014-03-12 17:06:19 +0900 | [diff] [blame] | 247 | /* |
| 248 | * This restriction comes from byte sized index implementation. |
| 249 | * Page size is normally 2^12 bytes and, in this case, if we want to use |
| 250 | * byte sized index which can represent 2^8 entries, the size of the object |
| 251 | * should be equal or greater to 2^12 / 2^8 = 2^4 = 16. |
| 252 | * If minimum size of kmalloc is less than 16, we use it as minimum object |
| 253 | * size and give up to use byte sized index. |
| 254 | */ |
| 255 | #define SLAB_OBJ_MIN_SIZE (KMALLOC_MIN_SIZE < 16 ? \ |
| 256 | (KMALLOC_MIN_SIZE) : 16) |
| 257 | |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 258 | #ifndef CONFIG_SLOB |
Christoph Lameter | 9425c58 | 2013-01-10 19:12:17 +0000 | [diff] [blame] | 259 | extern struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1]; |
| 260 | #ifdef CONFIG_ZONE_DMA |
| 261 | extern struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1]; |
| 262 | #endif |
| 263 | |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 264 | /* |
| 265 | * Figure out which kmalloc slab an allocation of a certain size |
| 266 | * belongs to. |
| 267 | * 0 = zero alloc |
| 268 | * 1 = 65 .. 96 bytes |
| 269 | * 2 = 120 .. 192 bytes |
| 270 | * n = 2^(n-1) .. 2^n -1 |
| 271 | */ |
| 272 | static __always_inline int kmalloc_index(size_t size) |
| 273 | { |
| 274 | if (!size) |
| 275 | return 0; |
| 276 | |
| 277 | if (size <= KMALLOC_MIN_SIZE) |
| 278 | return KMALLOC_SHIFT_LOW; |
| 279 | |
| 280 | if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96) |
| 281 | return 1; |
| 282 | if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192) |
| 283 | return 2; |
| 284 | if (size <= 8) return 3; |
| 285 | if (size <= 16) return 4; |
| 286 | if (size <= 32) return 5; |
| 287 | if (size <= 64) return 6; |
| 288 | if (size <= 128) return 7; |
| 289 | if (size <= 256) return 8; |
| 290 | if (size <= 512) return 9; |
| 291 | if (size <= 1024) return 10; |
| 292 | if (size <= 2 * 1024) return 11; |
| 293 | if (size <= 4 * 1024) return 12; |
| 294 | if (size <= 8 * 1024) return 13; |
| 295 | if (size <= 16 * 1024) return 14; |
| 296 | if (size <= 32 * 1024) return 15; |
| 297 | if (size <= 64 * 1024) return 16; |
| 298 | if (size <= 128 * 1024) return 17; |
| 299 | if (size <= 256 * 1024) return 18; |
| 300 | if (size <= 512 * 1024) return 19; |
| 301 | if (size <= 1024 * 1024) return 20; |
| 302 | if (size <= 2 * 1024 * 1024) return 21; |
| 303 | if (size <= 4 * 1024 * 1024) return 22; |
| 304 | if (size <= 8 * 1024 * 1024) return 23; |
| 305 | if (size <= 16 * 1024 * 1024) return 24; |
| 306 | if (size <= 32 * 1024 * 1024) return 25; |
| 307 | if (size <= 64 * 1024 * 1024) return 26; |
| 308 | BUG(); |
| 309 | |
| 310 | /* Will never be reached. Needed because the compiler may complain */ |
| 311 | return -1; |
| 312 | } |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 313 | #endif /* !CONFIG_SLOB */ |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 314 | |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 315 | void *__kmalloc(size_t size, gfp_t flags); |
| 316 | void *kmem_cache_alloc(struct kmem_cache *, gfp_t flags); |
| 317 | |
| 318 | #ifdef CONFIG_NUMA |
| 319 | void *__kmalloc_node(size_t size, gfp_t flags, int node); |
| 320 | void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node); |
| 321 | #else |
| 322 | static __always_inline void *__kmalloc_node(size_t size, gfp_t flags, int node) |
| 323 | { |
| 324 | return __kmalloc(size, flags); |
| 325 | } |
| 326 | |
| 327 | static __always_inline void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t flags, int node) |
| 328 | { |
| 329 | return kmem_cache_alloc(s, flags); |
| 330 | } |
| 331 | #endif |
| 332 | |
| 333 | #ifdef CONFIG_TRACING |
| 334 | extern void *kmem_cache_alloc_trace(struct kmem_cache *, gfp_t, size_t); |
| 335 | |
| 336 | #ifdef CONFIG_NUMA |
| 337 | extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s, |
| 338 | gfp_t gfpflags, |
| 339 | int node, size_t size); |
| 340 | #else |
| 341 | static __always_inline void * |
| 342 | kmem_cache_alloc_node_trace(struct kmem_cache *s, |
| 343 | gfp_t gfpflags, |
| 344 | int node, size_t size) |
| 345 | { |
| 346 | return kmem_cache_alloc_trace(s, gfpflags, size); |
| 347 | } |
| 348 | #endif /* CONFIG_NUMA */ |
| 349 | |
| 350 | #else /* CONFIG_TRACING */ |
| 351 | static __always_inline void *kmem_cache_alloc_trace(struct kmem_cache *s, |
| 352 | gfp_t flags, size_t size) |
| 353 | { |
| 354 | return kmem_cache_alloc(s, flags); |
| 355 | } |
| 356 | |
| 357 | static __always_inline void * |
| 358 | kmem_cache_alloc_node_trace(struct kmem_cache *s, |
| 359 | gfp_t gfpflags, |
| 360 | int node, size_t size) |
| 361 | { |
| 362 | return kmem_cache_alloc_node(s, gfpflags, node); |
| 363 | } |
| 364 | #endif /* CONFIG_TRACING */ |
| 365 | |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 366 | #ifdef CONFIG_SLAB |
| 367 | #include <linux/slab_def.h> |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 368 | #endif |
| 369 | |
| 370 | #ifdef CONFIG_SLUB |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 371 | #include <linux/slub_def.h> |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 372 | #endif |
| 373 | |
Vladimir Davydov | 5238343 | 2014-06-04 16:06:39 -0700 | [diff] [blame] | 374 | extern void *kmalloc_order(size_t size, gfp_t flags, unsigned int order); |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 375 | |
| 376 | #ifdef CONFIG_TRACING |
| 377 | extern void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order); |
| 378 | #else |
| 379 | static __always_inline void * |
| 380 | kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) |
| 381 | { |
| 382 | return kmalloc_order(size, flags, order); |
| 383 | } |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 384 | #endif |
| 385 | |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 386 | static __always_inline void *kmalloc_large(size_t size, gfp_t flags) |
| 387 | { |
| 388 | unsigned int order = get_order(size); |
| 389 | return kmalloc_order_trace(size, flags, order); |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * kmalloc - allocate memory |
| 394 | * @size: how many bytes of memory are required. |
Randy Dunlap | 7e3528c | 2013-11-22 18:14:38 -0800 | [diff] [blame] | 395 | * @flags: the type of memory to allocate. |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 396 | * |
| 397 | * kmalloc is the normal method of allocating memory |
| 398 | * for objects smaller than page size in the kernel. |
Randy Dunlap | 7e3528c | 2013-11-22 18:14:38 -0800 | [diff] [blame] | 399 | * |
| 400 | * The @flags argument may be one of: |
| 401 | * |
| 402 | * %GFP_USER - Allocate memory on behalf of user. May sleep. |
| 403 | * |
| 404 | * %GFP_KERNEL - Allocate normal kernel ram. May sleep. |
| 405 | * |
| 406 | * %GFP_ATOMIC - Allocation will not sleep. May use emergency pools. |
| 407 | * For example, use this inside interrupt handlers. |
| 408 | * |
| 409 | * %GFP_HIGHUSER - Allocate pages from high memory. |
| 410 | * |
| 411 | * %GFP_NOIO - Do not do any I/O at all while trying to get memory. |
| 412 | * |
| 413 | * %GFP_NOFS - Do not make any fs calls while trying to get memory. |
| 414 | * |
| 415 | * %GFP_NOWAIT - Allocation will not sleep. |
| 416 | * |
Johannes Weiner | e97ca8e | 2014-03-10 15:49:43 -0700 | [diff] [blame] | 417 | * %__GFP_THISNODE - Allocate node-local memory only. |
Randy Dunlap | 7e3528c | 2013-11-22 18:14:38 -0800 | [diff] [blame] | 418 | * |
| 419 | * %GFP_DMA - Allocation suitable for DMA. |
| 420 | * Should only be used for kmalloc() caches. Otherwise, use a |
| 421 | * slab created with SLAB_DMA. |
| 422 | * |
| 423 | * Also it is possible to set different flags by OR'ing |
| 424 | * in one or more of the following additional @flags: |
| 425 | * |
| 426 | * %__GFP_COLD - Request cache-cold pages instead of |
| 427 | * trying to return cache-warm pages. |
| 428 | * |
| 429 | * %__GFP_HIGH - This allocation has high priority and may use emergency pools. |
| 430 | * |
| 431 | * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail |
| 432 | * (think twice before using). |
| 433 | * |
| 434 | * %__GFP_NORETRY - If memory is not immediately available, |
| 435 | * then give up at once. |
| 436 | * |
| 437 | * %__GFP_NOWARN - If allocation fails, don't issue any warnings. |
| 438 | * |
| 439 | * %__GFP_REPEAT - If allocation fails initially, try once more before failing. |
| 440 | * |
| 441 | * There are other flags available as well, but these are not intended |
| 442 | * for general use, and so are not documented here. For a full list of |
| 443 | * potential flags, always refer to linux/gfp.h. |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 444 | */ |
| 445 | static __always_inline void *kmalloc(size_t size, gfp_t flags) |
| 446 | { |
| 447 | if (__builtin_constant_p(size)) { |
| 448 | if (size > KMALLOC_MAX_CACHE_SIZE) |
| 449 | return kmalloc_large(size, flags); |
| 450 | #ifndef CONFIG_SLOB |
| 451 | if (!(flags & GFP_DMA)) { |
| 452 | int index = kmalloc_index(size); |
| 453 | |
| 454 | if (!index) |
| 455 | return ZERO_SIZE_PTR; |
| 456 | |
| 457 | return kmem_cache_alloc_trace(kmalloc_caches[index], |
| 458 | flags, size); |
| 459 | } |
| 460 | #endif |
| 461 | } |
| 462 | return __kmalloc(size, flags); |
| 463 | } |
| 464 | |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 465 | /* |
| 466 | * Determine size used for the nth kmalloc cache. |
| 467 | * return size or 0 if a kmalloc cache for that |
| 468 | * size does not exist |
| 469 | */ |
| 470 | static __always_inline int kmalloc_size(int n) |
| 471 | { |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 472 | #ifndef CONFIG_SLOB |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 473 | if (n > 2) |
| 474 | return 1 << n; |
| 475 | |
| 476 | if (n == 1 && KMALLOC_MIN_SIZE <= 32) |
| 477 | return 96; |
| 478 | |
| 479 | if (n == 2 && KMALLOC_MIN_SIZE <= 64) |
| 480 | return 192; |
Christoph Lameter | 069e2b35 | 2013-06-14 19:55:13 +0000 | [diff] [blame] | 481 | #endif |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 482 | return 0; |
| 483 | } |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 484 | |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 485 | static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
| 486 | { |
| 487 | #ifndef CONFIG_SLOB |
| 488 | if (__builtin_constant_p(size) && |
Christoph Lameter | 23774a2 | 2013-09-04 19:58:08 +0000 | [diff] [blame] | 489 | size <= KMALLOC_MAX_CACHE_SIZE && !(flags & GFP_DMA)) { |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 490 | int i = kmalloc_index(size); |
| 491 | |
| 492 | if (!i) |
| 493 | return ZERO_SIZE_PTR; |
| 494 | |
| 495 | return kmem_cache_alloc_node_trace(kmalloc_caches[i], |
| 496 | flags, node, size); |
| 497 | } |
| 498 | #endif |
| 499 | return __kmalloc_node(size, flags, node); |
| 500 | } |
| 501 | |
Christoph Lameter | ce6a502 | 2013-01-10 19:14:19 +0000 | [diff] [blame] | 502 | /* |
Christoph Lameter | 9081064 | 2011-06-23 09:36:12 -0500 | [diff] [blame] | 503 | * Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment. |
| 504 | * Intended for arches that get misalignment faults even for 64 bit integer |
| 505 | * aligned buffers. |
| 506 | */ |
Christoph Lameter | 3192b92 | 2011-06-14 16:16:36 -0500 | [diff] [blame] | 507 | #ifndef ARCH_SLAB_MINALIGN |
| 508 | #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) |
| 509 | #endif |
Christoph Lameter | 0aa817f | 2007-05-16 22:11:01 -0700 | [diff] [blame] | 510 | /* |
Glauber Costa | ba6c496 | 2012-12-18 14:22:27 -0800 | [diff] [blame] | 511 | * This is the main placeholder for memcg-related information in kmem caches. |
| 512 | * struct kmem_cache will hold a pointer to it, so the memory cost while |
| 513 | * disabled is 1 pointer. The runtime cost while enabled, gets bigger than it |
| 514 | * would otherwise be if that would be bundled in kmem_cache: we'll need an |
| 515 | * extra pointer chase. But the trade off clearly lays in favor of not |
| 516 | * penalizing non-users. |
| 517 | * |
| 518 | * Both the root cache and the child caches will have it. For the root cache, |
| 519 | * this will hold a dynamically allocated array large enough to hold |
Vladimir Davydov | f857026 | 2014-01-23 15:53:06 -0800 | [diff] [blame] | 520 | * information about the currently limited memcgs in the system. To allow the |
| 521 | * array to be accessed without taking any locks, on relocation we free the old |
| 522 | * version only after a grace period. |
Glauber Costa | ba6c496 | 2012-12-18 14:22:27 -0800 | [diff] [blame] | 523 | * |
| 524 | * Child caches will hold extra metadata needed for its operation. Fields are: |
| 525 | * |
| 526 | * @memcg: pointer to the memcg this cache belongs to |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 527 | * @list: list_head for the list of all caches in this memcg |
| 528 | * @root_cache: pointer to the global, root cache, this cache was derived from |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 529 | * @nr_pages: number of pages that belongs to this cache. |
Glauber Costa | ba6c496 | 2012-12-18 14:22:27 -0800 | [diff] [blame] | 530 | */ |
| 531 | struct memcg_cache_params { |
| 532 | bool is_root_cache; |
| 533 | union { |
Vladimir Davydov | f857026 | 2014-01-23 15:53:06 -0800 | [diff] [blame] | 534 | struct { |
| 535 | struct rcu_head rcu_head; |
| 536 | struct kmem_cache *memcg_caches[0]; |
| 537 | }; |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 538 | struct { |
| 539 | struct mem_cgroup *memcg; |
| 540 | struct list_head list; |
| 541 | struct kmem_cache *root_cache; |
Glauber Costa | 1f458cb | 2012-12-18 14:22:50 -0800 | [diff] [blame] | 542 | atomic_t nr_pages; |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 543 | }; |
Glauber Costa | ba6c496 | 2012-12-18 14:22:27 -0800 | [diff] [blame] | 544 | }; |
| 545 | }; |
| 546 | |
Glauber Costa | 2633d7a | 2012-12-18 14:22:34 -0800 | [diff] [blame] | 547 | int memcg_update_all_caches(int num_memcgs); |
| 548 | |
Glauber Costa | 749c541 | 2012-12-18 14:23:01 -0800 | [diff] [blame] | 549 | struct seq_file; |
| 550 | int cache_show(struct kmem_cache *s, struct seq_file *m); |
| 551 | void print_slabinfo_header(struct seq_file *m); |
| 552 | |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 553 | /** |
Michael Opdenacker | e7efa61 | 2013-06-25 18:16:55 +0200 | [diff] [blame] | 554 | * kmalloc_array - allocate memory for an array. |
| 555 | * @n: number of elements. |
| 556 | * @size: element size. |
| 557 | * @flags: the type of memory to allocate (see kmalloc). |
Paul Drynoff | 800590f | 2006-06-23 02:03:48 -0700 | [diff] [blame] | 558 | */ |
Xi Wang | a820372 | 2012-03-05 15:14:41 -0800 | [diff] [blame] | 559 | static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | { |
Xi Wang | a3860c1 | 2012-05-31 16:26:04 -0700 | [diff] [blame] | 561 | if (size != 0 && n > SIZE_MAX / size) |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 562 | return NULL; |
Xi Wang | a820372 | 2012-03-05 15:14:41 -0800 | [diff] [blame] | 563 | return __kmalloc(n * size, flags); |
| 564 | } |
| 565 | |
| 566 | /** |
| 567 | * kcalloc - allocate memory for an array. The memory is set to zero. |
| 568 | * @n: number of elements. |
| 569 | * @size: element size. |
| 570 | * @flags: the type of memory to allocate (see kmalloc). |
| 571 | */ |
| 572 | static inline void *kcalloc(size_t n, size_t size, gfp_t flags) |
| 573 | { |
| 574 | return kmalloc_array(n, size, flags | __GFP_ZERO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
| 576 | |
Christoph Hellwig | 1d2c8ee | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 577 | /* |
| 578 | * kmalloc_track_caller is a special version of kmalloc that records the |
| 579 | * calling function of the routine calling it for slab leak tracking instead |
| 580 | * of just the calling function (confusing, eh?). |
| 581 | * It's useful when the call to kmalloc comes from a widely-used standard |
| 582 | * allocator where we care about the real place the memory allocation |
| 583 | * request comes from. |
| 584 | */ |
Xiaotian Feng | 7adde04 | 2010-06-30 17:57:22 +0800 | [diff] [blame] | 585 | #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || \ |
Ezequiel Garcia | f3f7410 | 2012-09-08 17:47:53 -0300 | [diff] [blame] | 586 | (defined(CONFIG_SLAB) && defined(CONFIG_TRACING)) || \ |
| 587 | (defined(CONFIG_SLOB) && defined(CONFIG_TRACING)) |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 588 | extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long); |
Christoph Hellwig | 1d2c8ee | 2006-10-04 02:15:25 -0700 | [diff] [blame] | 589 | #define kmalloc_track_caller(size, flags) \ |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 590 | __kmalloc_track_caller(size, flags, _RET_IP_) |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 591 | #else |
| 592 | #define kmalloc_track_caller(size, flags) \ |
| 593 | __kmalloc(size, flags) |
| 594 | #endif /* DEBUG_SLAB */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
Manfred Spraul | 97e2bde | 2005-05-01 08:58:38 -0700 | [diff] [blame] | 596 | #ifdef CONFIG_NUMA |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 597 | /* |
| 598 | * kmalloc_node_track_caller is a special version of kmalloc_node that |
| 599 | * records the calling function of the routine calling it for slab leak |
| 600 | * tracking instead of just the calling function (confusing, eh?). |
| 601 | * It's useful when the call to kmalloc_node comes from a widely-used |
| 602 | * standard allocator where we care about the real place the memory |
| 603 | * allocation request comes from. |
| 604 | */ |
Xiaotian Feng | 7adde04 | 2010-06-30 17:57:22 +0800 | [diff] [blame] | 605 | #if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || \ |
Ezequiel Garcia | f3f7410 | 2012-09-08 17:47:53 -0300 | [diff] [blame] | 606 | (defined(CONFIG_SLAB) && defined(CONFIG_TRACING)) || \ |
| 607 | (defined(CONFIG_SLOB) && defined(CONFIG_TRACING)) |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 608 | extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long); |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 609 | #define kmalloc_node_track_caller(size, flags, node) \ |
| 610 | __kmalloc_node_track_caller(size, flags, node, \ |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 611 | _RET_IP_) |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 612 | #else |
| 613 | #define kmalloc_node_track_caller(size, flags, node) \ |
| 614 | __kmalloc_node(size, flags, node) |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 615 | #endif |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 616 | |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 617 | #else /* CONFIG_NUMA */ |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 618 | |
| 619 | #define kmalloc_node_track_caller(size, flags, node) \ |
| 620 | kmalloc_track_caller(size, flags) |
| 621 | |
Pascal Terjan | dfcd361 | 2008-11-25 15:08:19 +0100 | [diff] [blame] | 622 | #endif /* CONFIG_NUMA */ |
Christoph Hellwig | 8b98c16 | 2006-12-06 20:32:30 -0800 | [diff] [blame] | 623 | |
Christoph Lameter | 81cda66 | 2007-07-17 04:03:29 -0700 | [diff] [blame] | 624 | /* |
| 625 | * Shortcuts |
| 626 | */ |
| 627 | static inline void *kmem_cache_zalloc(struct kmem_cache *k, gfp_t flags) |
| 628 | { |
| 629 | return kmem_cache_alloc(k, flags | __GFP_ZERO); |
| 630 | } |
| 631 | |
| 632 | /** |
| 633 | * kzalloc - allocate memory. The memory is set to zero. |
| 634 | * @size: how many bytes of memory are required. |
| 635 | * @flags: the type of memory to allocate (see kmalloc). |
| 636 | */ |
| 637 | static inline void *kzalloc(size_t size, gfp_t flags) |
| 638 | { |
| 639 | return kmalloc(size, flags | __GFP_ZERO); |
| 640 | } |
| 641 | |
Jeff Layton | 979b0fe | 2008-06-05 22:47:00 -0700 | [diff] [blame] | 642 | /** |
| 643 | * kzalloc_node - allocate zeroed memory from a particular memory node. |
| 644 | * @size: how many bytes of memory are required. |
| 645 | * @flags: the type of memory to allocate (see kmalloc). |
| 646 | * @node: memory node from which to allocate |
| 647 | */ |
| 648 | static inline void *kzalloc_node(size_t size, gfp_t flags, int node) |
| 649 | { |
| 650 | return kmalloc_node(size, flags | __GFP_ZERO, node); |
| 651 | } |
| 652 | |
Ezequiel Garcia | 242860a | 2012-10-19 09:33:12 -0300 | [diff] [blame] | 653 | /* |
| 654 | * Determine the size of a slab object |
| 655 | */ |
| 656 | static inline unsigned int kmem_cache_size(struct kmem_cache *s) |
| 657 | { |
| 658 | return s->object_size; |
| 659 | } |
| 660 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 661 | void __init kmem_cache_init_late(void); |
| 662 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | #endif /* _LINUX_SLAB_H */ |