Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 1 | /* |
| 2 | * SLOB Allocator: Simple List Of Blocks |
| 3 | * |
| 4 | * Matt Mackall <mpm@selenic.com> 12/30/03 |
| 5 | * |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 6 | * NUMA support by Paul Mundt, 2007. |
| 7 | * |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 8 | * How SLOB works: |
| 9 | * |
| 10 | * The core of SLOB is a traditional K&R style heap allocator, with |
| 11 | * support for returning aligned objects. The granularity of this |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 12 | * allocator is as little as 2 bytes, however typically most architectures |
| 13 | * will require 4 bytes on 32-bit and 8 bytes on 64-bit. |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 14 | * |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 15 | * The slob heap is a set of linked list of pages from alloc_pages(), |
| 16 | * and within each page, there is a singly-linked list of free blocks |
| 17 | * (slob_t). The heap is grown on demand. To reduce fragmentation, |
| 18 | * heap pages are segregated into three lists, with objects less than |
| 19 | * 256 bytes, objects less than 1024 bytes, and all other objects. |
| 20 | * |
| 21 | * Allocation from heap involves first searching for a page with |
| 22 | * sufficient free blocks (using a next-fit-like approach) followed by |
| 23 | * a first-fit scan of the page. Deallocation inserts objects back |
| 24 | * into the free list in address order, so this is effectively an |
| 25 | * address-ordered first fit. |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 26 | * |
| 27 | * Above this is an implementation of kmalloc/kfree. Blocks returned |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 28 | * from kmalloc are prepended with a 4-byte header with the kmalloc size. |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 29 | * If kmalloc is asked for objects of PAGE_SIZE or larger, it calls |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 30 | * alloc_pages() directly, allocating compound pages so the page order |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 31 | * does not have to be separately tracked, and also stores the exact |
| 32 | * allocation size in page->private so that it can be used to accurately |
| 33 | * provide ksize(). These objects are detected in kfree() because slob_page() |
| 34 | * is false for them. |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 35 | * |
| 36 | * SLAB is emulated on top of SLOB by simply calling constructors and |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 37 | * destructors for every SLAB allocation. Objects are returned with the |
| 38 | * 4-byte alignment unless the SLAB_HWCACHE_ALIGN flag is set, in which |
| 39 | * case the low-level allocator will fragment blocks to create the proper |
| 40 | * alignment. Again, objects of page-size or greater are allocated by |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 41 | * calling alloc_pages(). As SLAB objects know their size, no separate |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 42 | * size bookkeeping is necessary and there is essentially no allocation |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 43 | * space overhead, and compound pages aren't needed for multi-page |
| 44 | * allocations. |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 45 | * |
| 46 | * NUMA support in SLOB is fairly simplistic, pushing most of the real |
| 47 | * logic down to the page allocator, and simply doing the node accounting |
| 48 | * on the upper levels. In the event that a node id is explicitly |
| 49 | * provided, alloc_pages_node() with the specified node id is used |
| 50 | * instead. The common case (or when the node id isn't explicitly provided) |
| 51 | * will default to the current node, as per numa_node_id(). |
| 52 | * |
| 53 | * Node aware pages are still inserted in to the global freelist, and |
| 54 | * these are scanned for by matching against the node id encoded in the |
| 55 | * page flags. As a result, block allocations that can be satisfied from |
| 56 | * the freelist will only be done so on pages residing on the same node, |
| 57 | * in order to prevent random node placement. |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 58 | */ |
| 59 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 60 | #include <linux/kernel.h> |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 61 | #include <linux/slab.h> |
| 62 | #include <linux/mm.h> |
| 63 | #include <linux/cache.h> |
| 64 | #include <linux/init.h> |
| 65 | #include <linux/module.h> |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 66 | #include <linux/rcupdate.h> |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 67 | #include <linux/list.h> |
Frederic Weisbecker | 36994e5 | 2008-12-29 13:42:23 -0800 | [diff] [blame^] | 68 | #include <trace/kmemtrace.h> |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 69 | #include <asm/atomic.h> |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 70 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 71 | /* |
| 72 | * slob_block has a field 'units', which indicates size of block if +ve, |
| 73 | * or offset of next block if -ve (in SLOB_UNITs). |
| 74 | * |
| 75 | * Free blocks of size 1 unit simply contain the offset of the next block. |
| 76 | * Those with larger size contain their size in the first SLOB_UNIT of |
| 77 | * memory, and the offset of the next free block in the second SLOB_UNIT. |
| 78 | */ |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 79 | #if PAGE_SIZE <= (32767 * 2) |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 80 | typedef s16 slobidx_t; |
| 81 | #else |
| 82 | typedef s32 slobidx_t; |
| 83 | #endif |
| 84 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 85 | struct slob_block { |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 86 | slobidx_t units; |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 87 | }; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 88 | typedef struct slob_block slob_t; |
| 89 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 90 | /* |
| 91 | * We use struct page fields to manage some slob allocation aspects, |
| 92 | * however to avoid the horrible mess in include/linux/mm_types.h, we'll |
| 93 | * just define our own struct page type variant here. |
| 94 | */ |
| 95 | struct slob_page { |
| 96 | union { |
| 97 | struct { |
| 98 | unsigned long flags; /* mandatory */ |
| 99 | atomic_t _count; /* mandatory */ |
| 100 | slobidx_t units; /* free units left in page */ |
| 101 | unsigned long pad[2]; |
| 102 | slob_t *free; /* first free slob_t in page */ |
| 103 | struct list_head list; /* linked list of free pages */ |
| 104 | }; |
| 105 | struct page page; |
| 106 | }; |
| 107 | }; |
| 108 | static inline void struct_slob_page_wrong_size(void) |
| 109 | { BUILD_BUG_ON(sizeof(struct slob_page) != sizeof(struct page)); } |
| 110 | |
| 111 | /* |
| 112 | * free_slob_page: call before a slob_page is returned to the page allocator. |
| 113 | */ |
| 114 | static inline void free_slob_page(struct slob_page *sp) |
| 115 | { |
| 116 | reset_page_mapcount(&sp->page); |
| 117 | sp->page.mapping = NULL; |
| 118 | } |
| 119 | |
| 120 | /* |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 121 | * All partially free slob pages go on these lists. |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 122 | */ |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 123 | #define SLOB_BREAK1 256 |
| 124 | #define SLOB_BREAK2 1024 |
| 125 | static LIST_HEAD(free_slob_small); |
| 126 | static LIST_HEAD(free_slob_medium); |
| 127 | static LIST_HEAD(free_slob_large); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 128 | |
| 129 | /* |
| 130 | * slob_page: True for all slob pages (false for bigblock pages) |
| 131 | */ |
| 132 | static inline int slob_page(struct slob_page *sp) |
| 133 | { |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 134 | return PageSlobPage((struct page *)sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | static inline void set_slob_page(struct slob_page *sp) |
| 138 | { |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 139 | __SetPageSlobPage((struct page *)sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | static inline void clear_slob_page(struct slob_page *sp) |
| 143 | { |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 144 | __ClearPageSlobPage((struct page *)sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | /* |
| 148 | * slob_page_free: true for pages on free_slob_pages list. |
| 149 | */ |
| 150 | static inline int slob_page_free(struct slob_page *sp) |
| 151 | { |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 152 | return PageSlobFree((struct page *)sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 153 | } |
| 154 | |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 155 | static void set_slob_page_free(struct slob_page *sp, struct list_head *list) |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 156 | { |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 157 | list_add(&sp->list, list); |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 158 | __SetPageSlobFree((struct page *)sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | static inline void clear_slob_page_free(struct slob_page *sp) |
| 162 | { |
| 163 | list_del(&sp->list); |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 164 | __ClearPageSlobFree((struct page *)sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 165 | } |
| 166 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 167 | #define SLOB_UNIT sizeof(slob_t) |
| 168 | #define SLOB_UNITS(size) (((size) + SLOB_UNIT - 1)/SLOB_UNIT) |
| 169 | #define SLOB_ALIGN L1_CACHE_BYTES |
| 170 | |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 171 | /* |
| 172 | * struct slob_rcu is inserted at the tail of allocated slob blocks, which |
| 173 | * were created with a SLAB_DESTROY_BY_RCU slab. slob_rcu is used to free |
| 174 | * the block using call_rcu. |
| 175 | */ |
| 176 | struct slob_rcu { |
| 177 | struct rcu_head head; |
| 178 | int size; |
| 179 | }; |
| 180 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 181 | /* |
| 182 | * slob_lock protects all slob allocator structures. |
| 183 | */ |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 184 | static DEFINE_SPINLOCK(slob_lock); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 185 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 186 | /* |
| 187 | * Encode the given size and next info into a free slob block s. |
| 188 | */ |
| 189 | static void set_slob(slob_t *s, slobidx_t size, slob_t *next) |
| 190 | { |
| 191 | slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK); |
| 192 | slobidx_t offset = next - base; |
Dimitri Gorokhovik | bcb4ddb | 2006-12-29 16:48:28 -0800 | [diff] [blame] | 193 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 194 | if (size > 1) { |
| 195 | s[0].units = size; |
| 196 | s[1].units = offset; |
| 197 | } else |
| 198 | s[0].units = -offset; |
| 199 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 200 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 201 | /* |
| 202 | * Return the size of a slob block. |
| 203 | */ |
| 204 | static slobidx_t slob_units(slob_t *s) |
| 205 | { |
| 206 | if (s->units > 0) |
| 207 | return s->units; |
| 208 | return 1; |
| 209 | } |
| 210 | |
| 211 | /* |
| 212 | * Return the next free slob block pointer after this one. |
| 213 | */ |
| 214 | static slob_t *slob_next(slob_t *s) |
| 215 | { |
| 216 | slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK); |
| 217 | slobidx_t next; |
| 218 | |
| 219 | if (s[0].units < 0) |
| 220 | next = -s[0].units; |
| 221 | else |
| 222 | next = s[1].units; |
| 223 | return base+next; |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * Returns true if s is the last free block in its page. |
| 228 | */ |
| 229 | static int slob_last(slob_t *s) |
| 230 | { |
| 231 | return !((unsigned long)slob_next(s) & ~PAGE_MASK); |
| 232 | } |
| 233 | |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 234 | static void *slob_new_page(gfp_t gfp, int order, int node) |
| 235 | { |
| 236 | void *page; |
| 237 | |
| 238 | #ifdef CONFIG_NUMA |
| 239 | if (node != -1) |
| 240 | page = alloc_pages_node(node, gfp, order); |
| 241 | else |
| 242 | #endif |
| 243 | page = alloc_pages(gfp, order); |
| 244 | |
| 245 | if (!page) |
| 246 | return NULL; |
| 247 | |
| 248 | return page_address(page); |
| 249 | } |
| 250 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 251 | /* |
| 252 | * Allocate a slob block within a given slob_page sp. |
| 253 | */ |
| 254 | static void *slob_page_alloc(struct slob_page *sp, size_t size, int align) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 255 | { |
| 256 | slob_t *prev, *cur, *aligned = 0; |
| 257 | int delta = 0, units = SLOB_UNITS(size); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 258 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 259 | for (prev = NULL, cur = sp->free; ; prev = cur, cur = slob_next(cur)) { |
| 260 | slobidx_t avail = slob_units(cur); |
| 261 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 262 | if (align) { |
| 263 | aligned = (slob_t *)ALIGN((unsigned long)cur, align); |
| 264 | delta = aligned - cur; |
| 265 | } |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 266 | if (avail >= units + delta) { /* room enough? */ |
| 267 | slob_t *next; |
| 268 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 269 | if (delta) { /* need to fragment head to align? */ |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 270 | next = slob_next(cur); |
| 271 | set_slob(aligned, avail - delta, next); |
| 272 | set_slob(cur, delta, aligned); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 273 | prev = cur; |
| 274 | cur = aligned; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 275 | avail = slob_units(cur); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 276 | } |
| 277 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 278 | next = slob_next(cur); |
| 279 | if (avail == units) { /* exact fit? unlink. */ |
| 280 | if (prev) |
| 281 | set_slob(prev, slob_units(prev), next); |
| 282 | else |
| 283 | sp->free = next; |
| 284 | } else { /* fragment */ |
| 285 | if (prev) |
| 286 | set_slob(prev, slob_units(prev), cur + units); |
| 287 | else |
| 288 | sp->free = cur + units; |
| 289 | set_slob(cur + units, avail - units, next); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 290 | } |
| 291 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 292 | sp->units -= units; |
| 293 | if (!sp->units) |
| 294 | clear_slob_page_free(sp); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 295 | return cur; |
| 296 | } |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 297 | if (slob_last(cur)) |
| 298 | return NULL; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 299 | } |
| 300 | } |
| 301 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 302 | /* |
| 303 | * slob_alloc: entry point into the slob allocator. |
| 304 | */ |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 305 | static void *slob_alloc(size_t size, gfp_t gfp, int align, int node) |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 306 | { |
| 307 | struct slob_page *sp; |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 308 | struct list_head *prev; |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 309 | struct list_head *slob_list; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 310 | slob_t *b = NULL; |
| 311 | unsigned long flags; |
| 312 | |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 313 | if (size < SLOB_BREAK1) |
| 314 | slob_list = &free_slob_small; |
| 315 | else if (size < SLOB_BREAK2) |
| 316 | slob_list = &free_slob_medium; |
| 317 | else |
| 318 | slob_list = &free_slob_large; |
| 319 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 320 | spin_lock_irqsave(&slob_lock, flags); |
| 321 | /* Iterate through each partially free page, try to find room */ |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 322 | list_for_each_entry(sp, slob_list, list) { |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 323 | #ifdef CONFIG_NUMA |
| 324 | /* |
| 325 | * If there's a node specification, search for a partial |
| 326 | * page with a matching node id in the freelist. |
| 327 | */ |
| 328 | if (node != -1 && page_to_nid(&sp->page) != node) |
| 329 | continue; |
| 330 | #endif |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 331 | /* Enough room on this page? */ |
| 332 | if (sp->units < SLOB_UNITS(size)) |
| 333 | continue; |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 334 | |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 335 | /* Attempt to alloc */ |
| 336 | prev = sp->list.prev; |
| 337 | b = slob_page_alloc(sp, size, align); |
| 338 | if (!b) |
| 339 | continue; |
| 340 | |
| 341 | /* Improve fragment distribution and reduce our average |
| 342 | * search time by starting our next search here. (see |
| 343 | * Knuth vol 1, sec 2.5, pg 449) */ |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 344 | if (prev != slob_list->prev && |
| 345 | slob_list->next != prev->next) |
| 346 | list_move_tail(slob_list, prev->next); |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 347 | break; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 348 | } |
| 349 | spin_unlock_irqrestore(&slob_lock, flags); |
| 350 | |
| 351 | /* Not enough space: must allocate a new page */ |
| 352 | if (!b) { |
Linus Torvalds | 7fd2725 | 2007-12-09 10:14:36 -0800 | [diff] [blame] | 353 | b = slob_new_page(gfp & ~__GFP_ZERO, 0, node); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 354 | if (!b) |
| 355 | return 0; |
| 356 | sp = (struct slob_page *)virt_to_page(b); |
| 357 | set_slob_page(sp); |
| 358 | |
| 359 | spin_lock_irqsave(&slob_lock, flags); |
| 360 | sp->units = SLOB_UNITS(PAGE_SIZE); |
| 361 | sp->free = b; |
| 362 | INIT_LIST_HEAD(&sp->list); |
| 363 | set_slob(b, SLOB_UNITS(PAGE_SIZE), b + SLOB_UNITS(PAGE_SIZE)); |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 364 | set_slob_page_free(sp, slob_list); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 365 | b = slob_page_alloc(sp, size, align); |
| 366 | BUG_ON(!b); |
| 367 | spin_unlock_irqrestore(&slob_lock, flags); |
| 368 | } |
Christoph Lameter | d07dbea | 2007-07-17 04:03:23 -0700 | [diff] [blame] | 369 | if (unlikely((gfp & __GFP_ZERO) && b)) |
| 370 | memset(b, 0, size); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 371 | return b; |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * slob_free: entry point into the slob allocator. |
| 376 | */ |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 377 | static void slob_free(void *block, int size) |
| 378 | { |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 379 | struct slob_page *sp; |
| 380 | slob_t *prev, *next, *b = (slob_t *)block; |
| 381 | slobidx_t units; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 382 | unsigned long flags; |
| 383 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 384 | if (unlikely(ZERO_OR_NULL_PTR(block))) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 385 | return; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 386 | BUG_ON(!size); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 387 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 388 | sp = (struct slob_page *)virt_to_page(block); |
| 389 | units = SLOB_UNITS(size); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 390 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 391 | spin_lock_irqsave(&slob_lock, flags); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 392 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 393 | if (sp->units + units == SLOB_UNITS(PAGE_SIZE)) { |
| 394 | /* Go directly to page allocator. Do not pass slob allocator */ |
| 395 | if (slob_page_free(sp)) |
| 396 | clear_slob_page_free(sp); |
| 397 | clear_slob_page(sp); |
| 398 | free_slob_page(sp); |
| 399 | free_page((unsigned long)b); |
| 400 | goto out; |
| 401 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 402 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 403 | if (!slob_page_free(sp)) { |
| 404 | /* This slob page is about to become partially free. Easy! */ |
| 405 | sp->units = units; |
| 406 | sp->free = b; |
| 407 | set_slob(b, units, |
| 408 | (void *)((unsigned long)(b + |
| 409 | SLOB_UNITS(PAGE_SIZE)) & PAGE_MASK)); |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 410 | set_slob_page_free(sp, &free_slob_small); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 411 | goto out; |
| 412 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 413 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 414 | /* |
| 415 | * Otherwise the page is already partially free, so find reinsertion |
| 416 | * point. |
| 417 | */ |
| 418 | sp->units += units; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 419 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 420 | if (b < sp->free) { |
Matt Mackall | 679299b | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 421 | if (b + units == sp->free) { |
| 422 | units += slob_units(sp->free); |
| 423 | sp->free = slob_next(sp->free); |
| 424 | } |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 425 | set_slob(b, units, sp->free); |
| 426 | sp->free = b; |
| 427 | } else { |
| 428 | prev = sp->free; |
| 429 | next = slob_next(prev); |
| 430 | while (b > next) { |
| 431 | prev = next; |
| 432 | next = slob_next(prev); |
| 433 | } |
| 434 | |
| 435 | if (!slob_last(prev) && b + units == next) { |
| 436 | units += slob_units(next); |
| 437 | set_slob(b, units, slob_next(next)); |
| 438 | } else |
| 439 | set_slob(b, units, next); |
| 440 | |
| 441 | if (prev + slob_units(prev) == b) { |
| 442 | units = slob_units(b) + slob_units(prev); |
| 443 | set_slob(prev, units, slob_next(b)); |
| 444 | } else |
| 445 | set_slob(prev, slob_units(prev), b); |
| 446 | } |
| 447 | out: |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 448 | spin_unlock_irqrestore(&slob_lock, flags); |
| 449 | } |
| 450 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 451 | /* |
| 452 | * End of slob allocator proper. Begin kmem_cache_alloc and kmalloc frontend. |
| 453 | */ |
| 454 | |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 455 | #ifndef ARCH_KMALLOC_MINALIGN |
| 456 | #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long) |
| 457 | #endif |
| 458 | |
| 459 | #ifndef ARCH_SLAB_MINALIGN |
| 460 | #define ARCH_SLAB_MINALIGN __alignof__(unsigned long) |
| 461 | #endif |
| 462 | |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 463 | void *__kmalloc_node(size_t size, gfp_t gfp, int node) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 464 | { |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 465 | unsigned int *m; |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 466 | int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 467 | void *ret; |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 468 | |
| 469 | if (size < PAGE_SIZE - align) { |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 470 | if (!size) |
| 471 | return ZERO_SIZE_PTR; |
| 472 | |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 473 | m = slob_alloc(size + align, gfp, align, node); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 474 | |
MinChan Kim | 239f49c | 2008-05-19 22:12:08 +0900 | [diff] [blame] | 475 | if (!m) |
| 476 | return NULL; |
| 477 | *m = size; |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 478 | ret = (void *)m + align; |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 479 | |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 480 | kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, |
| 481 | _RET_IP_, ret, |
| 482 | size, size + align, gfp, node); |
| 483 | } else { |
| 484 | unsigned int order = get_order(size); |
| 485 | |
| 486 | ret = slob_new_page(gfp | __GFP_COMP, order, node); |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 487 | if (ret) { |
| 488 | struct page *page; |
| 489 | page = virt_to_page(ret); |
| 490 | page->private = size; |
| 491 | } |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 492 | |
| 493 | kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, |
| 494 | _RET_IP_, ret, |
| 495 | size, PAGE_SIZE << order, gfp, node); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 496 | } |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 497 | |
| 498 | return ret; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 499 | } |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 500 | EXPORT_SYMBOL(__kmalloc_node); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 501 | |
| 502 | void kfree(const void *block) |
| 503 | { |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 504 | struct slob_page *sp; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 505 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 506 | if (unlikely(ZERO_OR_NULL_PTR(block))) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 507 | return; |
| 508 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 509 | sp = (struct slob_page *)virt_to_page(block); |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 510 | if (slob_page(sp)) { |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 511 | int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); |
| 512 | unsigned int *m = (unsigned int *)(block - align); |
| 513 | slob_free(m, *m + align); |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 514 | } else |
| 515 | put_page(&sp->page); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 516 | |
| 517 | kmemtrace_mark_free(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, block); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 518 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 519 | EXPORT_SYMBOL(kfree); |
| 520 | |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 521 | /* can't use ksize for kmem_cache_alloc memory, only kmalloc */ |
Pekka Enberg | fd76bab | 2007-05-06 14:48:40 -0700 | [diff] [blame] | 522 | size_t ksize(const void *block) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 523 | { |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 524 | struct slob_page *sp; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 525 | |
Christoph Lameter | ef8b452 | 2007-10-16 01:24:46 -0700 | [diff] [blame] | 526 | BUG_ON(!block); |
| 527 | if (unlikely(block == ZERO_SIZE_PTR)) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 528 | return 0; |
| 529 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 530 | sp = (struct slob_page *)virt_to_page(block); |
Matt Mackall | 70096a5 | 2008-10-08 14:51:57 -0500 | [diff] [blame] | 531 | if (slob_page(sp)) { |
| 532 | int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); |
| 533 | unsigned int *m = (unsigned int *)(block - align); |
| 534 | return SLOB_UNITS(*m) * SLOB_UNIT; |
| 535 | } else |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 536 | return sp->page.private; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 537 | } |
| 538 | |
| 539 | struct kmem_cache { |
| 540 | unsigned int size, align; |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 541 | unsigned long flags; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 542 | const char *name; |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 543 | void (*ctor)(void *); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 544 | }; |
| 545 | |
| 546 | struct kmem_cache *kmem_cache_create(const char *name, size_t size, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 547 | size_t align, unsigned long flags, void (*ctor)(void *)) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 548 | { |
| 549 | struct kmem_cache *c; |
| 550 | |
Yi Li | 0701a9e | 2008-04-25 19:49:21 +0300 | [diff] [blame] | 551 | c = slob_alloc(sizeof(struct kmem_cache), |
Catalin Marinas | 5e18e2b | 2008-12-15 13:54:16 -0800 | [diff] [blame] | 552 | GFP_KERNEL, ARCH_KMALLOC_MINALIGN, -1); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 553 | |
| 554 | if (c) { |
| 555 | c->name = name; |
| 556 | c->size = size; |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 557 | if (flags & SLAB_DESTROY_BY_RCU) { |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 558 | /* leave room for rcu footer at the end of object */ |
| 559 | c->size += sizeof(struct slob_rcu); |
| 560 | } |
| 561 | c->flags = flags; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 562 | c->ctor = ctor; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 563 | /* ignore alignment unless it's forced */ |
Christoph Lameter | 5af6083 | 2007-05-06 14:49:56 -0700 | [diff] [blame] | 564 | c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0; |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 565 | if (c->align < ARCH_SLAB_MINALIGN) |
| 566 | c->align = ARCH_SLAB_MINALIGN; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 567 | if (c->align < align) |
| 568 | c->align = align; |
Akinobu Mita | bc0055a | 2007-05-06 14:49:52 -0700 | [diff] [blame] | 569 | } else if (flags & SLAB_PANIC) |
| 570 | panic("Cannot create slab cache %s\n", name); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 571 | |
| 572 | return c; |
| 573 | } |
| 574 | EXPORT_SYMBOL(kmem_cache_create); |
| 575 | |
Alexey Dobriyan | 133d205 | 2006-09-27 01:49:41 -0700 | [diff] [blame] | 576 | void kmem_cache_destroy(struct kmem_cache *c) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 577 | { |
| 578 | slob_free(c, sizeof(struct kmem_cache)); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 579 | } |
| 580 | EXPORT_SYMBOL(kmem_cache_destroy); |
| 581 | |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 582 | void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 583 | { |
| 584 | void *b; |
| 585 | |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 586 | if (c->size < PAGE_SIZE) { |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 587 | b = slob_alloc(c->size, flags, c->align, node); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 588 | kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_CACHE, |
| 589 | _RET_IP_, b, c->size, |
| 590 | SLOB_UNITS(c->size) * SLOB_UNIT, |
| 591 | flags, node); |
| 592 | } else { |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 593 | b = slob_new_page(flags, get_order(c->size), node); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 594 | kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_CACHE, |
| 595 | _RET_IP_, b, c->size, |
| 596 | PAGE_SIZE << get_order(c->size), |
| 597 | flags, node); |
| 598 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 599 | |
| 600 | if (c->ctor) |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 601 | c->ctor(b); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 602 | |
| 603 | return b; |
| 604 | } |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 605 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 606 | |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 607 | static void __kmem_cache_free(void *b, int size) |
| 608 | { |
| 609 | if (size < PAGE_SIZE) |
| 610 | slob_free(b, size); |
| 611 | else |
| 612 | free_pages((unsigned long)b, get_order(size)); |
| 613 | } |
| 614 | |
| 615 | static void kmem_rcu_free(struct rcu_head *head) |
| 616 | { |
| 617 | struct slob_rcu *slob_rcu = (struct slob_rcu *)head; |
| 618 | void *b = (void *)slob_rcu - (slob_rcu->size - sizeof(struct slob_rcu)); |
| 619 | |
| 620 | __kmem_cache_free(b, slob_rcu->size); |
| 621 | } |
| 622 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 623 | void kmem_cache_free(struct kmem_cache *c, void *b) |
| 624 | { |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 625 | if (unlikely(c->flags & SLAB_DESTROY_BY_RCU)) { |
| 626 | struct slob_rcu *slob_rcu; |
| 627 | slob_rcu = b + (c->size - sizeof(struct slob_rcu)); |
| 628 | INIT_RCU_HEAD(&slob_rcu->head); |
| 629 | slob_rcu->size = c->size; |
| 630 | call_rcu(&slob_rcu->head, kmem_rcu_free); |
| 631 | } else { |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 632 | __kmem_cache_free(b, c->size); |
| 633 | } |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 634 | |
| 635 | kmemtrace_mark_free(KMEMTRACE_TYPE_CACHE, _RET_IP_, b); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 636 | } |
| 637 | EXPORT_SYMBOL(kmem_cache_free); |
| 638 | |
| 639 | unsigned int kmem_cache_size(struct kmem_cache *c) |
| 640 | { |
| 641 | return c->size; |
| 642 | } |
| 643 | EXPORT_SYMBOL(kmem_cache_size); |
| 644 | |
| 645 | const char *kmem_cache_name(struct kmem_cache *c) |
| 646 | { |
| 647 | return c->name; |
| 648 | } |
| 649 | EXPORT_SYMBOL(kmem_cache_name); |
| 650 | |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 651 | int kmem_cache_shrink(struct kmem_cache *d) |
| 652 | { |
| 653 | return 0; |
| 654 | } |
| 655 | EXPORT_SYMBOL(kmem_cache_shrink); |
| 656 | |
Christoph Lameter | 55935a3 | 2006-12-13 00:34:24 -0800 | [diff] [blame] | 657 | int kmem_ptr_validate(struct kmem_cache *a, const void *b) |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 658 | { |
| 659 | return 0; |
| 660 | } |
| 661 | |
Paul Mundt | 84a01c2 | 2007-07-15 23:38:24 -0700 | [diff] [blame] | 662 | static unsigned int slob_ready __read_mostly; |
| 663 | |
| 664 | int slab_is_available(void) |
| 665 | { |
| 666 | return slob_ready; |
| 667 | } |
| 668 | |
Dimitri Gorokhovik | bcb4ddb | 2006-12-29 16:48:28 -0800 | [diff] [blame] | 669 | void __init kmem_cache_init(void) |
| 670 | { |
Paul Mundt | 84a01c2 | 2007-07-15 23:38:24 -0700 | [diff] [blame] | 671 | slob_ready = 1; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 672 | } |