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> |
Zhaolei | 02af61b | 2009-04-10 14:26:18 +0800 | [diff] [blame^] | 68 | #include <linux/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 | /* |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 130 | * is_slob_page: True for all slob pages (false for bigblock pages) |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 131 | */ |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 132 | static inline int is_slob_page(struct slob_page *sp) |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 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 | |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 147 | static inline struct slob_page *slob_page(const void *addr) |
| 148 | { |
| 149 | return (struct slob_page *)virt_to_page(addr); |
| 150 | } |
| 151 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 152 | /* |
| 153 | * slob_page_free: true for pages on free_slob_pages list. |
| 154 | */ |
| 155 | static inline int slob_page_free(struct slob_page *sp) |
| 156 | { |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 157 | return PageSlobFree((struct page *)sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 158 | } |
| 159 | |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 160 | 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] | 161 | { |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 162 | list_add(&sp->list, list); |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 163 | __SetPageSlobFree((struct page *)sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | static inline void clear_slob_page_free(struct slob_page *sp) |
| 167 | { |
| 168 | list_del(&sp->list); |
Andy Whitcroft | 9023cb7 | 2008-07-23 21:27:19 -0700 | [diff] [blame] | 169 | __ClearPageSlobFree((struct page *)sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 170 | } |
| 171 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 172 | #define SLOB_UNIT sizeof(slob_t) |
| 173 | #define SLOB_UNITS(size) (((size) + SLOB_UNIT - 1)/SLOB_UNIT) |
| 174 | #define SLOB_ALIGN L1_CACHE_BYTES |
| 175 | |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 176 | /* |
| 177 | * struct slob_rcu is inserted at the tail of allocated slob blocks, which |
| 178 | * were created with a SLAB_DESTROY_BY_RCU slab. slob_rcu is used to free |
| 179 | * the block using call_rcu. |
| 180 | */ |
| 181 | struct slob_rcu { |
| 182 | struct rcu_head head; |
| 183 | int size; |
| 184 | }; |
| 185 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 186 | /* |
| 187 | * slob_lock protects all slob allocator structures. |
| 188 | */ |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 189 | static DEFINE_SPINLOCK(slob_lock); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 190 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 191 | /* |
| 192 | * Encode the given size and next info into a free slob block s. |
| 193 | */ |
| 194 | static void set_slob(slob_t *s, slobidx_t size, slob_t *next) |
| 195 | { |
| 196 | slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK); |
| 197 | slobidx_t offset = next - base; |
Dimitri Gorokhovik | bcb4ddb | 2006-12-29 16:48:28 -0800 | [diff] [blame] | 198 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 199 | if (size > 1) { |
| 200 | s[0].units = size; |
| 201 | s[1].units = offset; |
| 202 | } else |
| 203 | s[0].units = -offset; |
| 204 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 205 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 206 | /* |
| 207 | * Return the size of a slob block. |
| 208 | */ |
| 209 | static slobidx_t slob_units(slob_t *s) |
| 210 | { |
| 211 | if (s->units > 0) |
| 212 | return s->units; |
| 213 | return 1; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Return the next free slob block pointer after this one. |
| 218 | */ |
| 219 | static slob_t *slob_next(slob_t *s) |
| 220 | { |
| 221 | slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK); |
| 222 | slobidx_t next; |
| 223 | |
| 224 | if (s[0].units < 0) |
| 225 | next = -s[0].units; |
| 226 | else |
| 227 | next = s[1].units; |
| 228 | return base+next; |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * Returns true if s is the last free block in its page. |
| 233 | */ |
| 234 | static int slob_last(slob_t *s) |
| 235 | { |
| 236 | return !((unsigned long)slob_next(s) & ~PAGE_MASK); |
| 237 | } |
| 238 | |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 239 | static void *slob_new_pages(gfp_t gfp, int order, int node) |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 240 | { |
| 241 | void *page; |
| 242 | |
| 243 | #ifdef CONFIG_NUMA |
| 244 | if (node != -1) |
| 245 | page = alloc_pages_node(node, gfp, order); |
| 246 | else |
| 247 | #endif |
| 248 | page = alloc_pages(gfp, order); |
| 249 | |
| 250 | if (!page) |
| 251 | return NULL; |
| 252 | |
| 253 | return page_address(page); |
| 254 | } |
| 255 | |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 256 | static void slob_free_pages(void *b, int order) |
| 257 | { |
| 258 | free_pages((unsigned long)b, order); |
| 259 | } |
| 260 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 261 | /* |
| 262 | * Allocate a slob block within a given slob_page sp. |
| 263 | */ |
| 264 | 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] | 265 | { |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 266 | slob_t *prev, *cur, *aligned = NULL; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 267 | int delta = 0, units = SLOB_UNITS(size); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 268 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 269 | for (prev = NULL, cur = sp->free; ; prev = cur, cur = slob_next(cur)) { |
| 270 | slobidx_t avail = slob_units(cur); |
| 271 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 272 | if (align) { |
| 273 | aligned = (slob_t *)ALIGN((unsigned long)cur, align); |
| 274 | delta = aligned - cur; |
| 275 | } |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 276 | if (avail >= units + delta) { /* room enough? */ |
| 277 | slob_t *next; |
| 278 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 279 | if (delta) { /* need to fragment head to align? */ |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 280 | next = slob_next(cur); |
| 281 | set_slob(aligned, avail - delta, next); |
| 282 | set_slob(cur, delta, aligned); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 283 | prev = cur; |
| 284 | cur = aligned; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 285 | avail = slob_units(cur); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 286 | } |
| 287 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 288 | next = slob_next(cur); |
| 289 | if (avail == units) { /* exact fit? unlink. */ |
| 290 | if (prev) |
| 291 | set_slob(prev, slob_units(prev), next); |
| 292 | else |
| 293 | sp->free = next; |
| 294 | } else { /* fragment */ |
| 295 | if (prev) |
| 296 | set_slob(prev, slob_units(prev), cur + units); |
| 297 | else |
| 298 | sp->free = cur + units; |
| 299 | set_slob(cur + units, avail - units, next); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 300 | } |
| 301 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 302 | sp->units -= units; |
| 303 | if (!sp->units) |
| 304 | clear_slob_page_free(sp); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 305 | return cur; |
| 306 | } |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 307 | if (slob_last(cur)) |
| 308 | return NULL; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 309 | } |
| 310 | } |
| 311 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 312 | /* |
| 313 | * slob_alloc: entry point into the slob allocator. |
| 314 | */ |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 315 | 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] | 316 | { |
| 317 | struct slob_page *sp; |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 318 | struct list_head *prev; |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 319 | struct list_head *slob_list; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 320 | slob_t *b = NULL; |
| 321 | unsigned long flags; |
| 322 | |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 323 | if (size < SLOB_BREAK1) |
| 324 | slob_list = &free_slob_small; |
| 325 | else if (size < SLOB_BREAK2) |
| 326 | slob_list = &free_slob_medium; |
| 327 | else |
| 328 | slob_list = &free_slob_large; |
| 329 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 330 | spin_lock_irqsave(&slob_lock, flags); |
| 331 | /* Iterate through each partially free page, try to find room */ |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 332 | list_for_each_entry(sp, slob_list, list) { |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 333 | #ifdef CONFIG_NUMA |
| 334 | /* |
| 335 | * If there's a node specification, search for a partial |
| 336 | * page with a matching node id in the freelist. |
| 337 | */ |
| 338 | if (node != -1 && page_to_nid(&sp->page) != node) |
| 339 | continue; |
| 340 | #endif |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 341 | /* Enough room on this page? */ |
| 342 | if (sp->units < SLOB_UNITS(size)) |
| 343 | continue; |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 344 | |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 345 | /* Attempt to alloc */ |
| 346 | prev = sp->list.prev; |
| 347 | b = slob_page_alloc(sp, size, align); |
| 348 | if (!b) |
| 349 | continue; |
| 350 | |
| 351 | /* Improve fragment distribution and reduce our average |
| 352 | * search time by starting our next search here. (see |
| 353 | * Knuth vol 1, sec 2.5, pg 449) */ |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 354 | if (prev != slob_list->prev && |
| 355 | slob_list->next != prev->next) |
| 356 | list_move_tail(slob_list, prev->next); |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 357 | break; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 358 | } |
| 359 | spin_unlock_irqrestore(&slob_lock, flags); |
| 360 | |
| 361 | /* Not enough space: must allocate a new page */ |
| 362 | if (!b) { |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 363 | b = slob_new_pages(gfp & ~__GFP_ZERO, 0, node); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 364 | if (!b) |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 365 | return NULL; |
| 366 | sp = slob_page(b); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 367 | set_slob_page(sp); |
| 368 | |
| 369 | spin_lock_irqsave(&slob_lock, flags); |
| 370 | sp->units = SLOB_UNITS(PAGE_SIZE); |
| 371 | sp->free = b; |
| 372 | INIT_LIST_HEAD(&sp->list); |
| 373 | set_slob(b, SLOB_UNITS(PAGE_SIZE), b + SLOB_UNITS(PAGE_SIZE)); |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 374 | set_slob_page_free(sp, slob_list); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 375 | b = slob_page_alloc(sp, size, align); |
| 376 | BUG_ON(!b); |
| 377 | spin_unlock_irqrestore(&slob_lock, flags); |
| 378 | } |
Christoph Lameter | d07dbea | 2007-07-17 04:03:23 -0700 | [diff] [blame] | 379 | if (unlikely((gfp & __GFP_ZERO) && b)) |
| 380 | memset(b, 0, size); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 381 | return b; |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * slob_free: entry point into the slob allocator. |
| 386 | */ |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 387 | static void slob_free(void *block, int size) |
| 388 | { |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 389 | struct slob_page *sp; |
| 390 | slob_t *prev, *next, *b = (slob_t *)block; |
| 391 | slobidx_t units; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 392 | unsigned long flags; |
| 393 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 394 | if (unlikely(ZERO_OR_NULL_PTR(block))) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 395 | return; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 396 | BUG_ON(!size); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 397 | |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 398 | sp = slob_page(block); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 399 | units = SLOB_UNITS(size); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 400 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 401 | spin_lock_irqsave(&slob_lock, flags); |
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 (sp->units + units == SLOB_UNITS(PAGE_SIZE)) { |
| 404 | /* Go directly to page allocator. Do not pass slob allocator */ |
| 405 | if (slob_page_free(sp)) |
| 406 | clear_slob_page_free(sp); |
Nick Piggin | 6fb8f42 | 2009-03-16 21:00:28 +1100 | [diff] [blame] | 407 | spin_unlock_irqrestore(&slob_lock, flags); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 408 | clear_slob_page(sp); |
| 409 | free_slob_page(sp); |
| 410 | free_page((unsigned long)b); |
Nick Piggin | 6fb8f42 | 2009-03-16 21:00:28 +1100 | [diff] [blame] | 411 | return; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 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 | if (!slob_page_free(sp)) { |
| 415 | /* This slob page is about to become partially free. Easy! */ |
| 416 | sp->units = units; |
| 417 | sp->free = b; |
| 418 | set_slob(b, units, |
| 419 | (void *)((unsigned long)(b + |
| 420 | SLOB_UNITS(PAGE_SIZE)) & PAGE_MASK)); |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 421 | set_slob_page_free(sp, &free_slob_small); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 422 | goto out; |
| 423 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 424 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 425 | /* |
| 426 | * Otherwise the page is already partially free, so find reinsertion |
| 427 | * point. |
| 428 | */ |
| 429 | sp->units += units; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 430 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 431 | if (b < sp->free) { |
Matt Mackall | 679299b | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 432 | if (b + units == sp->free) { |
| 433 | units += slob_units(sp->free); |
| 434 | sp->free = slob_next(sp->free); |
| 435 | } |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 436 | set_slob(b, units, sp->free); |
| 437 | sp->free = b; |
| 438 | } else { |
| 439 | prev = sp->free; |
| 440 | next = slob_next(prev); |
| 441 | while (b > next) { |
| 442 | prev = next; |
| 443 | next = slob_next(prev); |
| 444 | } |
| 445 | |
| 446 | if (!slob_last(prev) && b + units == next) { |
| 447 | units += slob_units(next); |
| 448 | set_slob(b, units, slob_next(next)); |
| 449 | } else |
| 450 | set_slob(b, units, next); |
| 451 | |
| 452 | if (prev + slob_units(prev) == b) { |
| 453 | units = slob_units(b) + slob_units(prev); |
| 454 | set_slob(prev, units, slob_next(b)); |
| 455 | } else |
| 456 | set_slob(prev, slob_units(prev), b); |
| 457 | } |
| 458 | out: |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 459 | spin_unlock_irqrestore(&slob_lock, flags); |
| 460 | } |
| 461 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 462 | /* |
| 463 | * End of slob allocator proper. Begin kmem_cache_alloc and kmalloc frontend. |
| 464 | */ |
| 465 | |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 466 | #ifndef ARCH_KMALLOC_MINALIGN |
| 467 | #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long) |
| 468 | #endif |
| 469 | |
| 470 | #ifndef ARCH_SLAB_MINALIGN |
| 471 | #define ARCH_SLAB_MINALIGN __alignof__(unsigned long) |
| 472 | #endif |
| 473 | |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 474 | void *__kmalloc_node(size_t size, gfp_t gfp, int node) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 475 | { |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 476 | unsigned int *m; |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 477 | int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 478 | void *ret; |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 479 | |
Ingo Molnar | 19cefdf | 2009-03-15 06:03:11 +0100 | [diff] [blame] | 480 | lockdep_trace_alloc(gfp); |
Nick Piggin | cf40bd1 | 2009-01-21 08:12:39 +0100 | [diff] [blame] | 481 | |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 482 | if (size < PAGE_SIZE - align) { |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 483 | if (!size) |
| 484 | return ZERO_SIZE_PTR; |
| 485 | |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 486 | m = slob_alloc(size + align, gfp, align, node); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 487 | |
MinChan Kim | 239f49c | 2008-05-19 22:12:08 +0900 | [diff] [blame] | 488 | if (!m) |
| 489 | return NULL; |
| 490 | *m = size; |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 491 | ret = (void *)m + align; |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 492 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 493 | trace_kmalloc_node(_RET_IP_, ret, |
| 494 | size, size + align, gfp, node); |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 495 | } else { |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 496 | unsigned int order = get_order(size); |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 497 | |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 498 | ret = slob_new_pages(gfp | __GFP_COMP, get_order(size), node); |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 499 | if (ret) { |
| 500 | struct page *page; |
| 501 | page = virt_to_page(ret); |
| 502 | page->private = size; |
| 503 | } |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 504 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 505 | trace_kmalloc_node(_RET_IP_, ret, |
| 506 | size, PAGE_SIZE << order, gfp, node); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 507 | } |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 508 | |
| 509 | return ret; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 510 | } |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 511 | EXPORT_SYMBOL(__kmalloc_node); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 512 | |
| 513 | void kfree(const void *block) |
| 514 | { |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 515 | struct slob_page *sp; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 516 | |
Pekka Enberg | 2121db7 | 2009-03-25 11:05:57 +0200 | [diff] [blame] | 517 | trace_kfree(_RET_IP_, block); |
| 518 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 519 | if (unlikely(ZERO_OR_NULL_PTR(block))) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 520 | return; |
| 521 | |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 522 | sp = slob_page(block); |
| 523 | if (is_slob_page(sp)) { |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 524 | int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); |
| 525 | unsigned int *m = (unsigned int *)(block - align); |
| 526 | slob_free(m, *m + align); |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 527 | } else |
| 528 | put_page(&sp->page); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 529 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 530 | EXPORT_SYMBOL(kfree); |
| 531 | |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 532 | /* can't use ksize for kmem_cache_alloc memory, only kmalloc */ |
Pekka Enberg | fd76bab | 2007-05-06 14:48:40 -0700 | [diff] [blame] | 533 | size_t ksize(const void *block) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 534 | { |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 535 | struct slob_page *sp; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 536 | |
Christoph Lameter | ef8b452 | 2007-10-16 01:24:46 -0700 | [diff] [blame] | 537 | BUG_ON(!block); |
| 538 | if (unlikely(block == ZERO_SIZE_PTR)) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 539 | return 0; |
| 540 | |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 541 | sp = slob_page(block); |
| 542 | if (is_slob_page(sp)) { |
Matt Mackall | 70096a5 | 2008-10-08 14:51:57 -0500 | [diff] [blame] | 543 | int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); |
| 544 | unsigned int *m = (unsigned int *)(block - align); |
| 545 | return SLOB_UNITS(*m) * SLOB_UNIT; |
| 546 | } else |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 547 | return sp->page.private; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 548 | } |
Kirill A. Shutemov | b1aabec | 2009-02-10 15:21:44 +0200 | [diff] [blame] | 549 | EXPORT_SYMBOL(ksize); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 550 | |
| 551 | struct kmem_cache { |
| 552 | unsigned int size, align; |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 553 | unsigned long flags; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 554 | const char *name; |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 555 | void (*ctor)(void *); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 556 | }; |
| 557 | |
| 558 | struct kmem_cache *kmem_cache_create(const char *name, size_t size, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 559 | size_t align, unsigned long flags, void (*ctor)(void *)) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 560 | { |
| 561 | struct kmem_cache *c; |
| 562 | |
Yi Li | 0701a9e | 2008-04-25 19:49:21 +0300 | [diff] [blame] | 563 | c = slob_alloc(sizeof(struct kmem_cache), |
Catalin Marinas | 5e18e2b | 2008-12-15 13:54:16 -0800 | [diff] [blame] | 564 | GFP_KERNEL, ARCH_KMALLOC_MINALIGN, -1); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 565 | |
| 566 | if (c) { |
| 567 | c->name = name; |
| 568 | c->size = size; |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 569 | if (flags & SLAB_DESTROY_BY_RCU) { |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 570 | /* leave room for rcu footer at the end of object */ |
| 571 | c->size += sizeof(struct slob_rcu); |
| 572 | } |
| 573 | c->flags = flags; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 574 | c->ctor = ctor; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 575 | /* ignore alignment unless it's forced */ |
Christoph Lameter | 5af6083 | 2007-05-06 14:49:56 -0700 | [diff] [blame] | 576 | c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0; |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 577 | if (c->align < ARCH_SLAB_MINALIGN) |
| 578 | c->align = ARCH_SLAB_MINALIGN; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 579 | if (c->align < align) |
| 580 | c->align = align; |
Akinobu Mita | bc0055a | 2007-05-06 14:49:52 -0700 | [diff] [blame] | 581 | } else if (flags & SLAB_PANIC) |
| 582 | panic("Cannot create slab cache %s\n", name); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 583 | |
| 584 | return c; |
| 585 | } |
| 586 | EXPORT_SYMBOL(kmem_cache_create); |
| 587 | |
Alexey Dobriyan | 133d205 | 2006-09-27 01:49:41 -0700 | [diff] [blame] | 588 | void kmem_cache_destroy(struct kmem_cache *c) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 589 | { |
| 590 | slob_free(c, sizeof(struct kmem_cache)); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 591 | } |
| 592 | EXPORT_SYMBOL(kmem_cache_destroy); |
| 593 | |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 594 | 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] | 595 | { |
| 596 | void *b; |
| 597 | |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 598 | if (c->size < PAGE_SIZE) { |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 599 | b = slob_alloc(c->size, flags, c->align, node); |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 600 | trace_kmem_cache_alloc_node(_RET_IP_, b, c->size, |
| 601 | SLOB_UNITS(c->size) * SLOB_UNIT, |
| 602 | flags, node); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 603 | } else { |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 604 | b = slob_new_pages(flags, get_order(c->size), node); |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 605 | trace_kmem_cache_alloc_node(_RET_IP_, b, c->size, |
| 606 | PAGE_SIZE << get_order(c->size), |
| 607 | flags, node); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 608 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 609 | |
| 610 | if (c->ctor) |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 611 | c->ctor(b); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 612 | |
| 613 | return b; |
| 614 | } |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 615 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 616 | |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 617 | static void __kmem_cache_free(void *b, int size) |
| 618 | { |
| 619 | if (size < PAGE_SIZE) |
| 620 | slob_free(b, size); |
| 621 | else |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 622 | slob_free_pages(b, get_order(size)); |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 623 | } |
| 624 | |
| 625 | static void kmem_rcu_free(struct rcu_head *head) |
| 626 | { |
| 627 | struct slob_rcu *slob_rcu = (struct slob_rcu *)head; |
| 628 | void *b = (void *)slob_rcu - (slob_rcu->size - sizeof(struct slob_rcu)); |
| 629 | |
| 630 | __kmem_cache_free(b, slob_rcu->size); |
| 631 | } |
| 632 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 633 | void kmem_cache_free(struct kmem_cache *c, void *b) |
| 634 | { |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 635 | if (unlikely(c->flags & SLAB_DESTROY_BY_RCU)) { |
| 636 | struct slob_rcu *slob_rcu; |
| 637 | slob_rcu = b + (c->size - sizeof(struct slob_rcu)); |
| 638 | INIT_RCU_HEAD(&slob_rcu->head); |
| 639 | slob_rcu->size = c->size; |
| 640 | call_rcu(&slob_rcu->head, kmem_rcu_free); |
| 641 | } else { |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 642 | __kmem_cache_free(b, c->size); |
| 643 | } |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 644 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 645 | trace_kmem_cache_free(_RET_IP_, b); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 646 | } |
| 647 | EXPORT_SYMBOL(kmem_cache_free); |
| 648 | |
| 649 | unsigned int kmem_cache_size(struct kmem_cache *c) |
| 650 | { |
| 651 | return c->size; |
| 652 | } |
| 653 | EXPORT_SYMBOL(kmem_cache_size); |
| 654 | |
| 655 | const char *kmem_cache_name(struct kmem_cache *c) |
| 656 | { |
| 657 | return c->name; |
| 658 | } |
| 659 | EXPORT_SYMBOL(kmem_cache_name); |
| 660 | |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 661 | int kmem_cache_shrink(struct kmem_cache *d) |
| 662 | { |
| 663 | return 0; |
| 664 | } |
| 665 | EXPORT_SYMBOL(kmem_cache_shrink); |
| 666 | |
Christoph Lameter | 55935a3 | 2006-12-13 00:34:24 -0800 | [diff] [blame] | 667 | int kmem_ptr_validate(struct kmem_cache *a, const void *b) |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 668 | { |
| 669 | return 0; |
| 670 | } |
| 671 | |
Paul Mundt | 84a01c2 | 2007-07-15 23:38:24 -0700 | [diff] [blame] | 672 | static unsigned int slob_ready __read_mostly; |
| 673 | |
| 674 | int slab_is_available(void) |
| 675 | { |
| 676 | return slob_ready; |
| 677 | } |
| 678 | |
Dimitri Gorokhovik | bcb4ddb | 2006-12-29 16:48:28 -0800 | [diff] [blame] | 679 | void __init kmem_cache_init(void) |
| 680 | { |
Paul Mundt | 84a01c2 | 2007-07-15 23:38:24 -0700 | [diff] [blame] | 681 | slob_ready = 1; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 682 | } |