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 |
Ezequiel Garcia | 999d879 | 2012-10-19 09:33:10 -0300 | [diff] [blame] | 31 | * does not have to be separately tracked. |
| 32 | * These objects are detected in kfree() because PageSlab() |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 33 | * is false for them. |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 34 | * |
| 35 | * SLAB is emulated on top of SLOB by simply calling constructors and |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 36 | * destructors for every SLAB allocation. Objects are returned with the |
| 37 | * 4-byte alignment unless the SLAB_HWCACHE_ALIGN flag is set, in which |
| 38 | * case the low-level allocator will fragment blocks to create the proper |
| 39 | * alignment. Again, objects of page-size or greater are allocated by |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 40 | * calling alloc_pages(). As SLAB objects know their size, no separate |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 41 | * size bookkeeping is necessary and there is essentially no allocation |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 42 | * space overhead, and compound pages aren't needed for multi-page |
| 43 | * allocations. |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 44 | * |
| 45 | * NUMA support in SLOB is fairly simplistic, pushing most of the real |
| 46 | * logic down to the page allocator, and simply doing the node accounting |
| 47 | * on the upper levels. In the event that a node id is explicitly |
Mel Gorman | 6484eb3 | 2009-06-16 15:31:54 -0700 | [diff] [blame] | 48 | * provided, alloc_pages_exact_node() with the specified node id is used |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 49 | * instead. The common case (or when the node id isn't explicitly provided) |
| 50 | * will default to the current node, as per numa_node_id(). |
| 51 | * |
| 52 | * Node aware pages are still inserted in to the global freelist, and |
| 53 | * these are scanned for by matching against the node id encoded in the |
| 54 | * page flags. As a result, block allocations that can be satisfied from |
| 55 | * the freelist will only be done so on pages residing on the same node, |
| 56 | * in order to prevent random node placement. |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 57 | */ |
| 58 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 59 | #include <linux/kernel.h> |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 60 | #include <linux/slab.h> |
Christoph Lameter | 97d0660 | 2012-07-06 15:25:11 -0500 | [diff] [blame] | 61 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 62 | #include <linux/mm.h> |
Nick Piggin | 1f0532e | 2009-05-05 19:13:45 +1000 | [diff] [blame] | 63 | #include <linux/swap.h> /* struct reclaim_state */ |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 64 | #include <linux/cache.h> |
| 65 | #include <linux/init.h> |
Paul Gortmaker | b95f1b31 | 2011-10-16 02:01:52 -0400 | [diff] [blame] | 66 | #include <linux/export.h> |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 67 | #include <linux/rcupdate.h> |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 68 | #include <linux/list.h> |
Catalin Marinas | 4374e61 | 2009-06-11 13:23:17 +0100 | [diff] [blame] | 69 | #include <linux/kmemleak.h> |
Li Zefan | 039ca4e | 2010-05-26 17:22:17 +0800 | [diff] [blame] | 70 | |
| 71 | #include <trace/events/kmem.h> |
| 72 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 73 | #include <linux/atomic.h> |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 74 | |
Glauber Costa | b9ce5ef | 2012-12-18 14:22:46 -0800 | [diff] [blame] | 75 | #include "slab.h" |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 76 | /* |
| 77 | * slob_block has a field 'units', which indicates size of block if +ve, |
| 78 | * or offset of next block if -ve (in SLOB_UNITs). |
| 79 | * |
| 80 | * Free blocks of size 1 unit simply contain the offset of the next block. |
| 81 | * Those with larger size contain their size in the first SLOB_UNIT of |
| 82 | * memory, and the offset of the next free block in the second SLOB_UNIT. |
| 83 | */ |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 84 | #if PAGE_SIZE <= (32767 * 2) |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 85 | typedef s16 slobidx_t; |
| 86 | #else |
| 87 | typedef s32 slobidx_t; |
| 88 | #endif |
| 89 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 90 | struct slob_block { |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 91 | slobidx_t units; |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 92 | }; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 93 | typedef struct slob_block slob_t; |
| 94 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 95 | /* |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 96 | * All partially free slob pages go on these lists. |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 97 | */ |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 98 | #define SLOB_BREAK1 256 |
| 99 | #define SLOB_BREAK2 1024 |
| 100 | static LIST_HEAD(free_slob_small); |
| 101 | static LIST_HEAD(free_slob_medium); |
| 102 | static LIST_HEAD(free_slob_large); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 103 | |
| 104 | /* |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 105 | * slob_page_free: true for pages on free_slob_pages list. |
| 106 | */ |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 107 | static inline int slob_page_free(struct page *sp) |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 108 | { |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 109 | return PageSlobFree(sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 110 | } |
| 111 | |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 112 | static void set_slob_page_free(struct page *sp, struct list_head *list) |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 113 | { |
Dave Hansen | 34bf6ef | 2014-04-08 13:44:27 -0700 | [diff] [blame] | 114 | list_add(&sp->lru, list); |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 115 | __SetPageSlobFree(sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 116 | } |
| 117 | |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 118 | static inline void clear_slob_page_free(struct page *sp) |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 119 | { |
Dave Hansen | 34bf6ef | 2014-04-08 13:44:27 -0700 | [diff] [blame] | 120 | list_del(&sp->lru); |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 121 | __ClearPageSlobFree(sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 122 | } |
| 123 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 124 | #define SLOB_UNIT sizeof(slob_t) |
Sasha Levin | a6d7815 | 2012-12-20 14:11:39 -0500 | [diff] [blame] | 125 | #define SLOB_UNITS(size) DIV_ROUND_UP(size, SLOB_UNIT) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 126 | |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 127 | /* |
| 128 | * struct slob_rcu is inserted at the tail of allocated slob blocks, which |
| 129 | * were created with a SLAB_DESTROY_BY_RCU slab. slob_rcu is used to free |
| 130 | * the block using call_rcu. |
| 131 | */ |
| 132 | struct slob_rcu { |
| 133 | struct rcu_head head; |
| 134 | int size; |
| 135 | }; |
| 136 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 137 | /* |
| 138 | * slob_lock protects all slob allocator structures. |
| 139 | */ |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 140 | static DEFINE_SPINLOCK(slob_lock); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 141 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 142 | /* |
| 143 | * Encode the given size and next info into a free slob block s. |
| 144 | */ |
| 145 | static void set_slob(slob_t *s, slobidx_t size, slob_t *next) |
| 146 | { |
| 147 | slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK); |
| 148 | slobidx_t offset = next - base; |
Dimitri Gorokhovik | bcb4ddb | 2006-12-29 16:48:28 -0800 | [diff] [blame] | 149 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 150 | if (size > 1) { |
| 151 | s[0].units = size; |
| 152 | s[1].units = offset; |
| 153 | } else |
| 154 | s[0].units = -offset; |
| 155 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 156 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 157 | /* |
| 158 | * Return the size of a slob block. |
| 159 | */ |
| 160 | static slobidx_t slob_units(slob_t *s) |
| 161 | { |
| 162 | if (s->units > 0) |
| 163 | return s->units; |
| 164 | return 1; |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * Return the next free slob block pointer after this one. |
| 169 | */ |
| 170 | static slob_t *slob_next(slob_t *s) |
| 171 | { |
| 172 | slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK); |
| 173 | slobidx_t next; |
| 174 | |
| 175 | if (s[0].units < 0) |
| 176 | next = -s[0].units; |
| 177 | else |
| 178 | next = s[1].units; |
| 179 | return base+next; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Returns true if s is the last free block in its page. |
| 184 | */ |
| 185 | static int slob_last(slob_t *s) |
| 186 | { |
| 187 | return !((unsigned long)slob_next(s) & ~PAGE_MASK); |
| 188 | } |
| 189 | |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 190 | static void *slob_new_pages(gfp_t gfp, int order, int node) |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 191 | { |
| 192 | void *page; |
| 193 | |
| 194 | #ifdef CONFIG_NUMA |
Ezequiel Garcia | 90f2cbb | 2012-09-08 17:47:51 -0300 | [diff] [blame] | 195 | if (node != NUMA_NO_NODE) |
Mel Gorman | 6484eb3 | 2009-06-16 15:31:54 -0700 | [diff] [blame] | 196 | page = alloc_pages_exact_node(node, gfp, order); |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 197 | else |
| 198 | #endif |
| 199 | page = alloc_pages(gfp, order); |
| 200 | |
| 201 | if (!page) |
| 202 | return NULL; |
| 203 | |
| 204 | return page_address(page); |
| 205 | } |
| 206 | |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 207 | static void slob_free_pages(void *b, int order) |
| 208 | { |
Nick Piggin | 1f0532e | 2009-05-05 19:13:45 +1000 | [diff] [blame] | 209 | if (current->reclaim_state) |
| 210 | current->reclaim_state->reclaimed_slab += 1 << order; |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 211 | free_pages((unsigned long)b, order); |
| 212 | } |
| 213 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 214 | /* |
| 215 | * Allocate a slob block within a given slob_page sp. |
| 216 | */ |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 217 | static void *slob_page_alloc(struct page *sp, size_t size, int align) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 218 | { |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 219 | slob_t *prev, *cur, *aligned = NULL; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 220 | int delta = 0, units = SLOB_UNITS(size); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 221 | |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 222 | for (prev = NULL, cur = sp->freelist; ; prev = cur, cur = slob_next(cur)) { |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 223 | slobidx_t avail = slob_units(cur); |
| 224 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 225 | if (align) { |
| 226 | aligned = (slob_t *)ALIGN((unsigned long)cur, align); |
| 227 | delta = aligned - cur; |
| 228 | } |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 229 | if (avail >= units + delta) { /* room enough? */ |
| 230 | slob_t *next; |
| 231 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 232 | if (delta) { /* need to fragment head to align? */ |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 233 | next = slob_next(cur); |
| 234 | set_slob(aligned, avail - delta, next); |
| 235 | set_slob(cur, delta, aligned); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 236 | prev = cur; |
| 237 | cur = aligned; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 238 | avail = slob_units(cur); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 239 | } |
| 240 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 241 | next = slob_next(cur); |
| 242 | if (avail == units) { /* exact fit? unlink. */ |
| 243 | if (prev) |
| 244 | set_slob(prev, slob_units(prev), next); |
| 245 | else |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 246 | sp->freelist = next; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 247 | } else { /* fragment */ |
| 248 | if (prev) |
| 249 | set_slob(prev, slob_units(prev), cur + units); |
| 250 | else |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 251 | sp->freelist = cur + units; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 252 | set_slob(cur + units, avail - units, next); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 253 | } |
| 254 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 255 | sp->units -= units; |
| 256 | if (!sp->units) |
| 257 | clear_slob_page_free(sp); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 258 | return cur; |
| 259 | } |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 260 | if (slob_last(cur)) |
| 261 | return NULL; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 262 | } |
| 263 | } |
| 264 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 265 | /* |
| 266 | * slob_alloc: entry point into the slob allocator. |
| 267 | */ |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 268 | 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] | 269 | { |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 270 | struct page *sp; |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 271 | struct list_head *prev; |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 272 | struct list_head *slob_list; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 273 | slob_t *b = NULL; |
| 274 | unsigned long flags; |
| 275 | |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 276 | if (size < SLOB_BREAK1) |
| 277 | slob_list = &free_slob_small; |
| 278 | else if (size < SLOB_BREAK2) |
| 279 | slob_list = &free_slob_medium; |
| 280 | else |
| 281 | slob_list = &free_slob_large; |
| 282 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 283 | spin_lock_irqsave(&slob_lock, flags); |
| 284 | /* Iterate through each partially free page, try to find room */ |
Dave Hansen | 34bf6ef | 2014-04-08 13:44:27 -0700 | [diff] [blame] | 285 | list_for_each_entry(sp, slob_list, lru) { |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 286 | #ifdef CONFIG_NUMA |
| 287 | /* |
| 288 | * If there's a node specification, search for a partial |
| 289 | * page with a matching node id in the freelist. |
| 290 | */ |
Ezequiel Garcia | 90f2cbb | 2012-09-08 17:47:51 -0300 | [diff] [blame] | 291 | if (node != NUMA_NO_NODE && page_to_nid(sp) != node) |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 292 | continue; |
| 293 | #endif |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 294 | /* Enough room on this page? */ |
| 295 | if (sp->units < SLOB_UNITS(size)) |
| 296 | continue; |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 297 | |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 298 | /* Attempt to alloc */ |
Dave Hansen | 34bf6ef | 2014-04-08 13:44:27 -0700 | [diff] [blame] | 299 | prev = sp->lru.prev; |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 300 | b = slob_page_alloc(sp, size, align); |
| 301 | if (!b) |
| 302 | continue; |
| 303 | |
| 304 | /* Improve fragment distribution and reduce our average |
| 305 | * search time by starting our next search here. (see |
| 306 | * Knuth vol 1, sec 2.5, pg 449) */ |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 307 | if (prev != slob_list->prev && |
| 308 | slob_list->next != prev->next) |
| 309 | list_move_tail(slob_list, prev->next); |
Matt Mackall | d626954 | 2007-07-21 04:37:40 -0700 | [diff] [blame] | 310 | break; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 311 | } |
| 312 | spin_unlock_irqrestore(&slob_lock, flags); |
| 313 | |
| 314 | /* Not enough space: must allocate a new page */ |
| 315 | if (!b) { |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 316 | b = slob_new_pages(gfp & ~__GFP_ZERO, 0, node); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 317 | if (!b) |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 318 | return NULL; |
Christoph Lameter | b5568280 | 2012-06-13 10:24:54 -0500 | [diff] [blame] | 319 | sp = virt_to_page(b); |
| 320 | __SetPageSlab(sp); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 321 | |
| 322 | spin_lock_irqsave(&slob_lock, flags); |
| 323 | sp->units = SLOB_UNITS(PAGE_SIZE); |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 324 | sp->freelist = b; |
Dave Hansen | 34bf6ef | 2014-04-08 13:44:27 -0700 | [diff] [blame] | 325 | INIT_LIST_HEAD(&sp->lru); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 326 | set_slob(b, SLOB_UNITS(PAGE_SIZE), b + SLOB_UNITS(PAGE_SIZE)); |
Matt Mackall | 20cecba | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 327 | set_slob_page_free(sp, slob_list); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 328 | b = slob_page_alloc(sp, size, align); |
| 329 | BUG_ON(!b); |
| 330 | spin_unlock_irqrestore(&slob_lock, flags); |
| 331 | } |
Christoph Lameter | d07dbea | 2007-07-17 04:03:23 -0700 | [diff] [blame] | 332 | if (unlikely((gfp & __GFP_ZERO) && b)) |
| 333 | memset(b, 0, size); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 334 | return b; |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * slob_free: entry point into the slob allocator. |
| 339 | */ |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 340 | static void slob_free(void *block, int size) |
| 341 | { |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 342 | struct page *sp; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 343 | slob_t *prev, *next, *b = (slob_t *)block; |
| 344 | slobidx_t units; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 345 | unsigned long flags; |
Bob Liu | d602dab | 2010-07-10 18:05:33 +0800 | [diff] [blame] | 346 | struct list_head *slob_list; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 347 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 348 | if (unlikely(ZERO_OR_NULL_PTR(block))) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 349 | return; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 350 | BUG_ON(!size); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 351 | |
Christoph Lameter | b5568280 | 2012-06-13 10:24:54 -0500 | [diff] [blame] | 352 | sp = virt_to_page(block); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 353 | units = SLOB_UNITS(size); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 354 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 355 | spin_lock_irqsave(&slob_lock, flags); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 356 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 357 | if (sp->units + units == SLOB_UNITS(PAGE_SIZE)) { |
| 358 | /* Go directly to page allocator. Do not pass slob allocator */ |
| 359 | if (slob_page_free(sp)) |
| 360 | clear_slob_page_free(sp); |
Nick Piggin | 6fb8f42 | 2009-03-16 21:00:28 +1100 | [diff] [blame] | 361 | spin_unlock_irqrestore(&slob_lock, flags); |
Christoph Lameter | b5568280 | 2012-06-13 10:24:54 -0500 | [diff] [blame] | 362 | __ClearPageSlab(sp); |
Mel Gorman | 22b751c | 2013-02-22 16:34:59 -0800 | [diff] [blame] | 363 | page_mapcount_reset(sp); |
Nick Piggin | 1f0532e | 2009-05-05 19:13:45 +1000 | [diff] [blame] | 364 | slob_free_pages(b, 0); |
Nick Piggin | 6fb8f42 | 2009-03-16 21:00:28 +1100 | [diff] [blame] | 365 | return; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 366 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 367 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 368 | if (!slob_page_free(sp)) { |
| 369 | /* This slob page is about to become partially free. Easy! */ |
| 370 | sp->units = units; |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 371 | sp->freelist = b; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 372 | set_slob(b, units, |
| 373 | (void *)((unsigned long)(b + |
| 374 | SLOB_UNITS(PAGE_SIZE)) & PAGE_MASK)); |
Bob Liu | d602dab | 2010-07-10 18:05:33 +0800 | [diff] [blame] | 375 | if (size < SLOB_BREAK1) |
| 376 | slob_list = &free_slob_small; |
| 377 | else if (size < SLOB_BREAK2) |
| 378 | slob_list = &free_slob_medium; |
| 379 | else |
| 380 | slob_list = &free_slob_large; |
| 381 | set_slob_page_free(sp, slob_list); |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 382 | goto out; |
| 383 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 384 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 385 | /* |
| 386 | * Otherwise the page is already partially free, so find reinsertion |
| 387 | * point. |
| 388 | */ |
| 389 | sp->units += units; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 390 | |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 391 | if (b < (slob_t *)sp->freelist) { |
| 392 | if (b + units == sp->freelist) { |
| 393 | units += slob_units(sp->freelist); |
| 394 | sp->freelist = slob_next(sp->freelist); |
Matt Mackall | 679299b | 2008-02-04 22:29:37 -0800 | [diff] [blame] | 395 | } |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 396 | set_slob(b, units, sp->freelist); |
| 397 | sp->freelist = b; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 398 | } else { |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 399 | prev = sp->freelist; |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 400 | next = slob_next(prev); |
| 401 | while (b > next) { |
| 402 | prev = next; |
| 403 | next = slob_next(prev); |
| 404 | } |
| 405 | |
| 406 | if (!slob_last(prev) && b + units == next) { |
| 407 | units += slob_units(next); |
| 408 | set_slob(b, units, slob_next(next)); |
| 409 | } else |
| 410 | set_slob(b, units, next); |
| 411 | |
| 412 | if (prev + slob_units(prev) == b) { |
| 413 | units = slob_units(b) + slob_units(prev); |
| 414 | set_slob(prev, units, slob_next(b)); |
| 415 | } else |
| 416 | set_slob(prev, slob_units(prev), b); |
| 417 | } |
| 418 | out: |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 419 | spin_unlock_irqrestore(&slob_lock, flags); |
| 420 | } |
| 421 | |
Nick Piggin | 95b3512 | 2007-07-15 23:38:07 -0700 | [diff] [blame] | 422 | /* |
| 423 | * End of slob allocator proper. Begin kmem_cache_alloc and kmalloc frontend. |
| 424 | */ |
| 425 | |
Ezequiel Garcia | f3f7410 | 2012-09-08 17:47:53 -0300 | [diff] [blame] | 426 | static __always_inline void * |
| 427 | __do_kmalloc_node(size_t size, gfp_t gfp, int node, unsigned long caller) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 428 | { |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 429 | unsigned int *m; |
Arnd Bergmann | 789306e | 2012-10-05 16:55:20 +0200 | [diff] [blame] | 430 | int align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 431 | void *ret; |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 432 | |
Steven Rostedt | bd50cfa | 2011-06-07 07:18:45 -0400 | [diff] [blame] | 433 | gfp &= gfp_allowed_mask; |
| 434 | |
Ingo Molnar | 19cefdf | 2009-03-15 06:03:11 +0100 | [diff] [blame] | 435 | lockdep_trace_alloc(gfp); |
Nick Piggin | cf40bd1 | 2009-01-21 08:12:39 +0100 | [diff] [blame] | 436 | |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 437 | if (size < PAGE_SIZE - align) { |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 438 | if (!size) |
| 439 | return ZERO_SIZE_PTR; |
| 440 | |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 441 | m = slob_alloc(size + align, gfp, align, node); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 442 | |
MinChan Kim | 239f49c | 2008-05-19 22:12:08 +0900 | [diff] [blame] | 443 | if (!m) |
| 444 | return NULL; |
| 445 | *m = size; |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 446 | ret = (void *)m + align; |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 447 | |
Ezequiel Garcia | f3f7410 | 2012-09-08 17:47:53 -0300 | [diff] [blame] | 448 | trace_kmalloc_node(caller, ret, |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 449 | size, size + align, gfp, node); |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 450 | } else { |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 451 | unsigned int order = get_order(size); |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 452 | |
David Rientjes | 8df275a | 2010-08-22 16:16:06 -0700 | [diff] [blame] | 453 | if (likely(order)) |
| 454 | gfp |= __GFP_COMP; |
| 455 | ret = slob_new_pages(gfp, order, node); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 456 | |
Ezequiel Garcia | f3f7410 | 2012-09-08 17:47:53 -0300 | [diff] [blame] | 457 | trace_kmalloc_node(caller, ret, |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 458 | size, PAGE_SIZE << order, gfp, node); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 459 | } |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 460 | |
Catalin Marinas | 4374e61 | 2009-06-11 13:23:17 +0100 | [diff] [blame] | 461 | kmemleak_alloc(ret, size, 1, gfp); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 462 | return ret; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 463 | } |
Ezequiel Garcia | f3f7410 | 2012-09-08 17:47:53 -0300 | [diff] [blame] | 464 | |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 465 | void *__kmalloc(size_t size, gfp_t gfp) |
Ezequiel Garcia | f3f7410 | 2012-09-08 17:47:53 -0300 | [diff] [blame] | 466 | { |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 467 | return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, _RET_IP_); |
Ezequiel Garcia | f3f7410 | 2012-09-08 17:47:53 -0300 | [diff] [blame] | 468 | } |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 469 | EXPORT_SYMBOL(__kmalloc); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 470 | |
Ezequiel Garcia | f3f7410 | 2012-09-08 17:47:53 -0300 | [diff] [blame] | 471 | #ifdef CONFIG_TRACING |
| 472 | void *__kmalloc_track_caller(size_t size, gfp_t gfp, unsigned long caller) |
| 473 | { |
| 474 | return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, caller); |
| 475 | } |
| 476 | |
| 477 | #ifdef CONFIG_NUMA |
David Rientjes | 82bd550 | 2012-09-25 12:53:51 -0700 | [diff] [blame] | 478 | void *__kmalloc_node_track_caller(size_t size, gfp_t gfp, |
Ezequiel Garcia | f3f7410 | 2012-09-08 17:47:53 -0300 | [diff] [blame] | 479 | int node, unsigned long caller) |
| 480 | { |
| 481 | return __do_kmalloc_node(size, gfp, node, caller); |
| 482 | } |
| 483 | #endif |
| 484 | #endif |
| 485 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 486 | void kfree(const void *block) |
| 487 | { |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 488 | struct page *sp; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 489 | |
Pekka Enberg | 2121db7 | 2009-03-25 11:05:57 +0200 | [diff] [blame] | 490 | trace_kfree(_RET_IP_, block); |
| 491 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 492 | if (unlikely(ZERO_OR_NULL_PTR(block))) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 493 | return; |
Catalin Marinas | 4374e61 | 2009-06-11 13:23:17 +0100 | [diff] [blame] | 494 | kmemleak_free(block); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 495 | |
Christoph Lameter | b5568280 | 2012-06-13 10:24:54 -0500 | [diff] [blame] | 496 | sp = virt_to_page(block); |
| 497 | if (PageSlab(sp)) { |
Arnd Bergmann | 789306e | 2012-10-05 16:55:20 +0200 | [diff] [blame] | 498 | int align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); |
Nick Piggin | 5539484 | 2007-07-15 23:38:09 -0700 | [diff] [blame] | 499 | unsigned int *m = (unsigned int *)(block - align); |
| 500 | slob_free(m, *m + align); |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 501 | } else |
Ezequiel Garcia | 8cf9864 | 2012-10-22 09:04:31 -0300 | [diff] [blame] | 502 | __free_pages(sp, compound_order(sp)); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 503 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 504 | EXPORT_SYMBOL(kfree); |
| 505 | |
Nick Piggin | d87a133 | 2007-07-15 23:38:08 -0700 | [diff] [blame] | 506 | /* can't use ksize for kmem_cache_alloc memory, only kmalloc */ |
Pekka Enberg | fd76bab | 2007-05-06 14:48:40 -0700 | [diff] [blame] | 507 | size_t ksize(const void *block) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 508 | { |
Christoph Lameter | b8c24c4 | 2012-06-13 10:24:52 -0500 | [diff] [blame] | 509 | struct page *sp; |
Ezequiel Garcia | 999d879 | 2012-10-19 09:33:10 -0300 | [diff] [blame] | 510 | int align; |
| 511 | unsigned int *m; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 512 | |
Christoph Lameter | ef8b452 | 2007-10-16 01:24:46 -0700 | [diff] [blame] | 513 | BUG_ON(!block); |
| 514 | if (unlikely(block == ZERO_SIZE_PTR)) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 515 | return 0; |
| 516 | |
Christoph Lameter | b5568280 | 2012-06-13 10:24:54 -0500 | [diff] [blame] | 517 | sp = virt_to_page(block); |
Ezequiel Garcia | 999d879 | 2012-10-19 09:33:10 -0300 | [diff] [blame] | 518 | if (unlikely(!PageSlab(sp))) |
| 519 | return PAGE_SIZE << compound_order(sp); |
| 520 | |
Arnd Bergmann | 789306e | 2012-10-05 16:55:20 +0200 | [diff] [blame] | 521 | align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); |
Ezequiel Garcia | 999d879 | 2012-10-19 09:33:10 -0300 | [diff] [blame] | 522 | m = (unsigned int *)(block - align); |
| 523 | return SLOB_UNITS(*m) * SLOB_UNIT; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 524 | } |
Kirill A. Shutemov | b1aabec | 2009-02-10 15:21:44 +0200 | [diff] [blame] | 525 | EXPORT_SYMBOL(ksize); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 526 | |
Christoph Lameter | 8a13a4c | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 527 | int __kmem_cache_create(struct kmem_cache *c, unsigned long flags) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 528 | { |
Christoph Lameter | 278b1bb | 2012-09-05 00:20:34 +0000 | [diff] [blame] | 529 | if (flags & SLAB_DESTROY_BY_RCU) { |
| 530 | /* leave room for rcu footer at the end of object */ |
| 531 | c->size += sizeof(struct slob_rcu); |
Christoph Lameter | 039363f | 2012-07-06 15:25:10 -0500 | [diff] [blame] | 532 | } |
Christoph Lameter | 278b1bb | 2012-09-05 00:20:34 +0000 | [diff] [blame] | 533 | c->flags = flags; |
Christoph Lameter | 278b1bb | 2012-09-05 00:20:34 +0000 | [diff] [blame] | 534 | return 0; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 535 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 536 | |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 537 | void *slob_alloc_node(struct kmem_cache *c, gfp_t flags, int node) |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 538 | { |
| 539 | void *b; |
| 540 | |
Steven Rostedt | bd50cfa | 2011-06-07 07:18:45 -0400 | [diff] [blame] | 541 | flags &= gfp_allowed_mask; |
| 542 | |
| 543 | lockdep_trace_alloc(flags); |
| 544 | |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 545 | if (c->size < PAGE_SIZE) { |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 546 | b = slob_alloc(c->size, flags, c->align, node); |
Ezequiel Garcia | fe74fe2 | 2012-10-19 09:33:11 -0300 | [diff] [blame] | 547 | trace_kmem_cache_alloc_node(_RET_IP_, b, c->object_size, |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 548 | SLOB_UNITS(c->size) * SLOB_UNIT, |
| 549 | flags, node); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 550 | } else { |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 551 | b = slob_new_pages(flags, get_order(c->size), node); |
Ezequiel Garcia | fe74fe2 | 2012-10-19 09:33:11 -0300 | [diff] [blame] | 552 | trace_kmem_cache_alloc_node(_RET_IP_, b, c->object_size, |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 553 | PAGE_SIZE << get_order(c->size), |
| 554 | flags, node); |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 555 | } |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 556 | |
Steven Rostedt | c1e854e | 2013-01-17 12:13:46 -0500 | [diff] [blame] | 557 | if (b && c->ctor) |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 558 | c->ctor(b); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 559 | |
Catalin Marinas | 4374e61 | 2009-06-11 13:23:17 +0100 | [diff] [blame] | 560 | kmemleak_alloc_recursive(b, c->size, 1, c->flags, flags); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 561 | return b; |
| 562 | } |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 563 | EXPORT_SYMBOL(slob_alloc_node); |
| 564 | |
| 565 | void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) |
| 566 | { |
| 567 | return slob_alloc_node(cachep, flags, NUMA_NO_NODE); |
| 568 | } |
| 569 | EXPORT_SYMBOL(kmem_cache_alloc); |
| 570 | |
| 571 | #ifdef CONFIG_NUMA |
| 572 | void *__kmalloc_node(size_t size, gfp_t gfp, int node) |
| 573 | { |
| 574 | return __do_kmalloc_node(size, gfp, node, _RET_IP_); |
| 575 | } |
| 576 | EXPORT_SYMBOL(__kmalloc_node); |
| 577 | |
| 578 | void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t gfp, int node) |
| 579 | { |
| 580 | return slob_alloc_node(cachep, gfp, node); |
| 581 | } |
Paul Mundt | 6193a2f | 2007-07-15 23:38:22 -0700 | [diff] [blame] | 582 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
Christoph Lameter | f1b6eb6 | 2013-09-04 16:35:34 +0000 | [diff] [blame] | 583 | #endif |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 584 | |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 585 | static void __kmem_cache_free(void *b, int size) |
| 586 | { |
| 587 | if (size < PAGE_SIZE) |
| 588 | slob_free(b, size); |
| 589 | else |
Américo Wang | 6e9ed0c | 2009-01-19 02:00:38 +0800 | [diff] [blame] | 590 | slob_free_pages(b, get_order(size)); |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 591 | } |
| 592 | |
| 593 | static void kmem_rcu_free(struct rcu_head *head) |
| 594 | { |
| 595 | struct slob_rcu *slob_rcu = (struct slob_rcu *)head; |
| 596 | void *b = (void *)slob_rcu - (slob_rcu->size - sizeof(struct slob_rcu)); |
| 597 | |
| 598 | __kmem_cache_free(b, slob_rcu->size); |
| 599 | } |
| 600 | |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 601 | void kmem_cache_free(struct kmem_cache *c, void *b) |
| 602 | { |
Catalin Marinas | 4374e61 | 2009-06-11 13:23:17 +0100 | [diff] [blame] | 603 | kmemleak_free_recursive(b, c->flags); |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 604 | if (unlikely(c->flags & SLAB_DESTROY_BY_RCU)) { |
| 605 | struct slob_rcu *slob_rcu; |
| 606 | slob_rcu = b + (c->size - sizeof(struct slob_rcu)); |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 607 | slob_rcu->size = c->size; |
| 608 | call_rcu(&slob_rcu->head, kmem_rcu_free); |
| 609 | } else { |
Nick Piggin | afc0ced | 2007-05-16 22:10:49 -0700 | [diff] [blame] | 610 | __kmem_cache_free(b, c->size); |
| 611 | } |
Eduard - Gabriel Munteanu | 3eae2cb2 | 2008-08-10 20:14:07 +0300 | [diff] [blame] | 612 | |
Eduard - Gabriel Munteanu | ca2b84cb | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 613 | trace_kmem_cache_free(_RET_IP_, b); |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 614 | } |
| 615 | EXPORT_SYMBOL(kmem_cache_free); |
| 616 | |
Christoph Lameter | 945cf2b | 2012-09-04 23:18:33 +0000 | [diff] [blame] | 617 | int __kmem_cache_shutdown(struct kmem_cache *c) |
| 618 | { |
| 619 | /* No way to check for remaining objects */ |
| 620 | return 0; |
| 621 | } |
| 622 | |
Christoph Lameter | 2e892f4 | 2006-12-13 00:34:23 -0800 | [diff] [blame] | 623 | int kmem_cache_shrink(struct kmem_cache *d) |
| 624 | { |
| 625 | return 0; |
| 626 | } |
| 627 | EXPORT_SYMBOL(kmem_cache_shrink); |
| 628 | |
Christoph Lameter | 9b030cb | 2012-09-05 00:20:33 +0000 | [diff] [blame] | 629 | struct kmem_cache kmem_cache_boot = { |
| 630 | .name = "kmem_cache", |
| 631 | .size = sizeof(struct kmem_cache), |
| 632 | .flags = SLAB_PANIC, |
| 633 | .align = ARCH_KMALLOC_MINALIGN, |
| 634 | }; |
| 635 | |
Dimitri Gorokhovik | bcb4ddb | 2006-12-29 16:48:28 -0800 | [diff] [blame] | 636 | void __init kmem_cache_init(void) |
| 637 | { |
Christoph Lameter | 9b030cb | 2012-09-05 00:20:33 +0000 | [diff] [blame] | 638 | kmem_cache = &kmem_cache_boot; |
Christoph Lameter | 97d0660 | 2012-07-06 15:25:11 -0500 | [diff] [blame] | 639 | slab_state = UP; |
Matt Mackall | 10cef60 | 2006-01-08 01:01:45 -0800 | [diff] [blame] | 640 | } |
Wu Fengguang | bbff2e4 | 2009-08-06 11:36:25 +0300 | [diff] [blame] | 641 | |
| 642 | void __init kmem_cache_init_late(void) |
| 643 | { |
Christoph Lameter | 97d0660 | 2012-07-06 15:25:11 -0500 | [diff] [blame] | 644 | slab_state = FULL; |
Wu Fengguang | bbff2e4 | 2009-08-06 11:36:25 +0300 | [diff] [blame] | 645 | } |