Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * SLUB: A slab allocator that limits cache line use instead of queuing |
| 3 | * objects in per cpu and per node lists. |
| 4 | * |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 5 | * The allocator synchronizes using per slab locks or atomic operatios |
| 6 | * and only uses a centralized lock to manage a pool of partial slabs. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 7 | * |
Christoph Lameter | cde5353 | 2008-07-04 09:59:22 -0700 | [diff] [blame] | 8 | * (C) 2007 SGI, Christoph Lameter |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 9 | * (C) 2011 Linux Foundation, Christoph Lameter |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <linux/mm.h> |
Nick Piggin | 1eb5ac6 | 2009-05-05 19:13:44 +1000 | [diff] [blame] | 13 | #include <linux/swap.h> /* struct reclaim_state */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/bit_spinlock.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/bitops.h> |
| 18 | #include <linux/slab.h> |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 19 | #include <linux/proc_fs.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 20 | #include <linux/seq_file.h> |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 21 | #include <linux/kmemcheck.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 22 | #include <linux/cpu.h> |
| 23 | #include <linux/cpuset.h> |
| 24 | #include <linux/mempolicy.h> |
| 25 | #include <linux/ctype.h> |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 26 | #include <linux/debugobjects.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 27 | #include <linux/kallsyms.h> |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 28 | #include <linux/memory.h> |
Roman Zippel | f8bd225 | 2008-05-01 04:34:31 -0700 | [diff] [blame] | 29 | #include <linux/math64.h> |
Akinobu Mita | 773ff60 | 2008-12-23 19:37:01 +0900 | [diff] [blame] | 30 | #include <linux/fault-inject.h> |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 31 | |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 32 | #include <trace/events/kmem.h> |
| 33 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 34 | /* |
| 35 | * Lock order: |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 36 | * 1. slub_lock (Global Semaphore) |
| 37 | * 2. node->list_lock |
| 38 | * 3. slab_lock(page) (Only on some arches and for debugging) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 39 | * |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 40 | * slub_lock |
| 41 | * |
| 42 | * The role of the slub_lock is to protect the list of all the slabs |
| 43 | * and to synchronize major metadata changes to slab cache structures. |
| 44 | * |
| 45 | * The slab_lock is only used for debugging and on arches that do not |
| 46 | * have the ability to do a cmpxchg_double. It only protects the second |
| 47 | * double word in the page struct. Meaning |
| 48 | * A. page->freelist -> List of object free in a page |
| 49 | * B. page->counters -> Counters of objects |
| 50 | * C. page->frozen -> frozen state |
| 51 | * |
| 52 | * If a slab is frozen then it is exempt from list management. It is not |
| 53 | * on any list. The processor that froze the slab is the one who can |
| 54 | * perform list operations on the page. Other processors may put objects |
| 55 | * onto the freelist but the processor that froze the slab is the only |
| 56 | * one that can retrieve the objects from the page's freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 57 | * |
| 58 | * The list_lock protects the partial and full list on each node and |
| 59 | * the partial slab counter. If taken then no new slabs may be added or |
| 60 | * removed from the lists nor make the number of partial slabs be modified. |
| 61 | * (Note that the total number of slabs is an atomic value that may be |
| 62 | * modified without taking the list lock). |
| 63 | * |
| 64 | * The list_lock is a centralized lock and thus we avoid taking it as |
| 65 | * much as possible. As long as SLUB does not have to handle partial |
| 66 | * slabs, operations can continue without any centralized lock. F.e. |
| 67 | * allocating a long series of objects that fill up slabs does not require |
| 68 | * the list lock. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 69 | * Interrupts are disabled during allocation and deallocation in order to |
| 70 | * make the slab allocator safe to use in the context of an irq. In addition |
| 71 | * interrupts are disabled to ensure that the processor does not change |
| 72 | * while handling per_cpu slabs, due to kernel preemption. |
| 73 | * |
| 74 | * SLUB assigns one slab for allocation to each processor. |
| 75 | * Allocations only occur from these slabs called cpu slabs. |
| 76 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 77 | * Slabs with free elements are kept on a partial list and during regular |
| 78 | * operations no list for full slabs is used. If an object in a full slab is |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 79 | * freed then the slab will show up again on the partial lists. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 80 | * We track full slabs for debugging purposes though because otherwise we |
| 81 | * cannot scan all objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 82 | * |
| 83 | * Slabs are freed when they become empty. Teardown and setup is |
| 84 | * minimal so we rely on the page allocators per cpu caches for |
| 85 | * fast frees and allocs. |
| 86 | * |
| 87 | * Overloading of page flags that are otherwise used for LRU management. |
| 88 | * |
Christoph Lameter | 4b6f075 | 2007-05-16 22:10:53 -0700 | [diff] [blame] | 89 | * PageActive The slab is frozen and exempt from list processing. |
| 90 | * This means that the slab is dedicated to a purpose |
| 91 | * such as satisfying allocations for a specific |
| 92 | * processor. Objects may be freed in the slab while |
| 93 | * it is frozen but slab_free will then skip the usual |
| 94 | * list operations. It is up to the processor holding |
| 95 | * the slab to integrate the slab into the slab lists |
| 96 | * when the slab is no longer needed. |
| 97 | * |
| 98 | * One use of this flag is to mark slabs that are |
| 99 | * used for allocations. Then such a slab becomes a cpu |
| 100 | * slab. The cpu slab may be equipped with an additional |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 101 | * freelist that allows lockless access to |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 102 | * free objects in addition to the regular freelist |
| 103 | * that requires the slab lock. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 104 | * |
| 105 | * PageError Slab requires special handling due to debug |
| 106 | * options set. This moves slab handling out of |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 107 | * the fast path and disables lockless freelists. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 108 | */ |
| 109 | |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 110 | #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ |
| 111 | SLAB_TRACE | SLAB_DEBUG_FREE) |
| 112 | |
| 113 | static inline int kmem_cache_debug(struct kmem_cache *s) |
| 114 | { |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 115 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 116 | return unlikely(s->flags & SLAB_DEBUG_FLAGS); |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 117 | #else |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 118 | return 0; |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 119 | #endif |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 120 | } |
Christoph Lameter | 5577bd8 | 2007-05-16 22:10:56 -0700 | [diff] [blame] | 121 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 122 | /* |
| 123 | * Issues still to be resolved: |
| 124 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 125 | * - Support PAGE_ALLOC_DEBUG. Should be easy to do. |
| 126 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 127 | * - Variable sizing of the per node arrays |
| 128 | */ |
| 129 | |
| 130 | /* Enable to test recovery from slab corruption on boot */ |
| 131 | #undef SLUB_RESILIENCY_TEST |
| 132 | |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 133 | /* Enable to log cmpxchg failures */ |
| 134 | #undef SLUB_DEBUG_CMPXCHG |
| 135 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 136 | /* |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 137 | * Mininum number of partial slabs. These will be left on the partial |
| 138 | * lists even if they are empty. kmem_cache_shrink may reclaim them. |
| 139 | */ |
Christoph Lameter | 76be895 | 2007-12-21 14:37:37 -0800 | [diff] [blame] | 140 | #define MIN_PARTIAL 5 |
Christoph Lameter | e95eed5 | 2007-05-06 14:49:44 -0700 | [diff] [blame] | 141 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 142 | /* |
| 143 | * Maximum number of desirable partial slabs. |
| 144 | * The existence of more partial slabs makes kmem_cache_shrink |
| 145 | * sort the partial list by the number of objects in the. |
| 146 | */ |
| 147 | #define MAX_PARTIAL 10 |
| 148 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 149 | #define DEBUG_DEFAULT_FLAGS (SLAB_DEBUG_FREE | SLAB_RED_ZONE | \ |
| 150 | SLAB_POISON | SLAB_STORE_USER) |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 151 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 152 | /* |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 153 | * Debugging flags that require metadata to be stored in the slab. These get |
| 154 | * disabled when slub_debug=O is used and a cache's min order increases with |
| 155 | * metadata. |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 156 | */ |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 157 | #define DEBUG_METADATA_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 158 | |
| 159 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 160 | * Set of flags that will prevent slab merging |
| 161 | */ |
| 162 | #define SLUB_NEVER_MERGE (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 163 | SLAB_TRACE | SLAB_DESTROY_BY_RCU | SLAB_NOLEAKTRACE | \ |
| 164 | SLAB_FAILSLAB) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 165 | |
| 166 | #define SLUB_MERGE_SAME (SLAB_DEBUG_FREE | SLAB_RECLAIM_ACCOUNT | \ |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 167 | SLAB_CACHE_DMA | SLAB_NOTRACK) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 168 | |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 169 | #define OO_SHIFT 16 |
| 170 | #define OO_MASK ((1 << OO_SHIFT) - 1) |
Christoph Lameter | 50d5c41 | 2011-06-01 12:25:45 -0500 | [diff] [blame] | 171 | #define MAX_OBJS_PER_PAGE 32767 /* since page.objects is u15 */ |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 172 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 173 | /* Internal SLUB flags */ |
Christoph Lameter | f90ec39 | 2010-07-09 14:07:11 -0500 | [diff] [blame] | 174 | #define __OBJECT_POISON 0x80000000UL /* Poison object */ |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 175 | #define __CMPXCHG_DOUBLE 0x40000000UL /* Use cmpxchg_double */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 176 | |
| 177 | static int kmem_size = sizeof(struct kmem_cache); |
| 178 | |
| 179 | #ifdef CONFIG_SMP |
| 180 | static struct notifier_block slab_notifier; |
| 181 | #endif |
| 182 | |
| 183 | static enum { |
| 184 | DOWN, /* No slab functionality available */ |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 185 | PARTIAL, /* Kmem_cache_node works */ |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 186 | UP, /* Everything works but does not show up in sysfs */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 187 | SYSFS /* Sysfs up */ |
| 188 | } slab_state = DOWN; |
| 189 | |
| 190 | /* A list of all slab caches on the system */ |
| 191 | static DECLARE_RWSEM(slub_lock); |
Adrian Bunk | 5af328a | 2007-07-17 04:03:27 -0700 | [diff] [blame] | 192 | static LIST_HEAD(slab_caches); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 193 | |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 194 | /* |
| 195 | * Tracking user of a slab. |
| 196 | */ |
| 197 | struct track { |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 198 | unsigned long addr; /* Called from address */ |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 199 | int cpu; /* Was running on cpu */ |
| 200 | int pid; /* Pid context */ |
| 201 | unsigned long when; /* When did the operation occur */ |
| 202 | }; |
| 203 | |
| 204 | enum track_item { TRACK_ALLOC, TRACK_FREE }; |
| 205 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 206 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 207 | static int sysfs_slab_add(struct kmem_cache *); |
| 208 | static int sysfs_slab_alias(struct kmem_cache *, const char *); |
| 209 | static void sysfs_slab_remove(struct kmem_cache *); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 210 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 211 | #else |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 212 | static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } |
| 213 | static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) |
| 214 | { return 0; } |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 215 | static inline void sysfs_slab_remove(struct kmem_cache *s) |
| 216 | { |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 217 | kfree(s->name); |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 218 | kfree(s); |
| 219 | } |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 220 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 221 | #endif |
| 222 | |
Christoph Lameter | 4fdccdf | 2011-03-22 13:35:00 -0500 | [diff] [blame] | 223 | static inline void stat(const struct kmem_cache *s, enum stat_item si) |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 224 | { |
| 225 | #ifdef CONFIG_SLUB_STATS |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 226 | __this_cpu_inc(s->cpu_slab->stat[si]); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 227 | #endif |
| 228 | } |
| 229 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 230 | /******************************************************************** |
| 231 | * Core slab cache functions |
| 232 | *******************************************************************/ |
| 233 | |
| 234 | int slab_is_available(void) |
| 235 | { |
| 236 | return slab_state >= UP; |
| 237 | } |
| 238 | |
| 239 | static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) |
| 240 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 241 | return s->node[node]; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 242 | } |
| 243 | |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 244 | /* Verify that a pointer has an address that is valid within a slab page */ |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 245 | static inline int check_valid_pointer(struct kmem_cache *s, |
| 246 | struct page *page, const void *object) |
| 247 | { |
| 248 | void *base; |
| 249 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 250 | if (!object) |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 251 | return 1; |
| 252 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 253 | base = page_address(page); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 254 | if (object < base || object >= base + page->objects * s->size || |
Christoph Lameter | 02cbc87 | 2007-05-09 02:32:43 -0700 | [diff] [blame] | 255 | (object - base) % s->size) { |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | return 1; |
| 260 | } |
| 261 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 262 | static inline void *get_freepointer(struct kmem_cache *s, void *object) |
| 263 | { |
| 264 | return *(void **)(object + s->offset); |
| 265 | } |
| 266 | |
Christoph Lameter | 1393d9a | 2011-05-16 15:26:08 -0500 | [diff] [blame] | 267 | static inline void *get_freepointer_safe(struct kmem_cache *s, void *object) |
| 268 | { |
| 269 | void *p; |
| 270 | |
| 271 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 272 | probe_kernel_read(&p, (void **)(object + s->offset), sizeof(p)); |
| 273 | #else |
| 274 | p = get_freepointer(s, object); |
| 275 | #endif |
| 276 | return p; |
| 277 | } |
| 278 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 279 | static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp) |
| 280 | { |
| 281 | *(void **)(object + s->offset) = fp; |
| 282 | } |
| 283 | |
| 284 | /* Loop over all objects in a slab */ |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 285 | #define for_each_object(__p, __s, __addr, __objects) \ |
| 286 | for (__p = (__addr); __p < (__addr) + (__objects) * (__s)->size;\ |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 287 | __p += (__s)->size) |
| 288 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 289 | /* Determine object index from a given position */ |
| 290 | static inline int slab_index(void *p, struct kmem_cache *s, void *addr) |
| 291 | { |
| 292 | return (p - addr) / s->size; |
| 293 | } |
| 294 | |
Mariusz Kozlowski | d71f606 | 2011-02-26 20:10:26 +0100 | [diff] [blame] | 295 | static inline size_t slab_ksize(const struct kmem_cache *s) |
| 296 | { |
| 297 | #ifdef CONFIG_SLUB_DEBUG |
| 298 | /* |
| 299 | * Debugging requires use of the padding between object |
| 300 | * and whatever may come after it. |
| 301 | */ |
| 302 | if (s->flags & (SLAB_RED_ZONE | SLAB_POISON)) |
| 303 | return s->objsize; |
| 304 | |
| 305 | #endif |
| 306 | /* |
| 307 | * If we have the need to store the freelist pointer |
| 308 | * back there or track user information then we can |
| 309 | * only use the space before that information. |
| 310 | */ |
| 311 | if (s->flags & (SLAB_DESTROY_BY_RCU | SLAB_STORE_USER)) |
| 312 | return s->inuse; |
| 313 | /* |
| 314 | * Else we can use all the padding etc for the allocation |
| 315 | */ |
| 316 | return s->size; |
| 317 | } |
| 318 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 319 | static inline int order_objects(int order, unsigned long size, int reserved) |
| 320 | { |
| 321 | return ((PAGE_SIZE << order) - reserved) / size; |
| 322 | } |
| 323 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 324 | static inline struct kmem_cache_order_objects oo_make(int order, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 325 | unsigned long size, int reserved) |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 326 | { |
| 327 | struct kmem_cache_order_objects x = { |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 328 | (order << OO_SHIFT) + order_objects(order, size, reserved) |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 329 | }; |
| 330 | |
| 331 | return x; |
| 332 | } |
| 333 | |
| 334 | static inline int oo_order(struct kmem_cache_order_objects x) |
| 335 | { |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 336 | return x.x >> OO_SHIFT; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | static inline int oo_objects(struct kmem_cache_order_objects x) |
| 340 | { |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 341 | return x.x & OO_MASK; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 342 | } |
| 343 | |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 344 | /* |
| 345 | * Per slab locking using the pagelock |
| 346 | */ |
| 347 | static __always_inline void slab_lock(struct page *page) |
| 348 | { |
| 349 | bit_spin_lock(PG_locked, &page->flags); |
| 350 | } |
| 351 | |
| 352 | static __always_inline void slab_unlock(struct page *page) |
| 353 | { |
| 354 | __bit_spin_unlock(PG_locked, &page->flags); |
| 355 | } |
| 356 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 357 | /* Interrupts must be disabled (for the fallback code to work right) */ |
| 358 | static inline bool __cmpxchg_double_slab(struct kmem_cache *s, struct page *page, |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 359 | void *freelist_old, unsigned long counters_old, |
| 360 | void *freelist_new, unsigned long counters_new, |
| 361 | const char *n) |
| 362 | { |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 363 | VM_BUG_ON(!irqs_disabled()); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 364 | #ifdef CONFIG_CMPXCHG_DOUBLE |
| 365 | if (s->flags & __CMPXCHG_DOUBLE) { |
| 366 | if (cmpxchg_double(&page->freelist, |
| 367 | freelist_old, counters_old, |
| 368 | freelist_new, counters_new)) |
| 369 | return 1; |
| 370 | } else |
| 371 | #endif |
| 372 | { |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 373 | slab_lock(page); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 374 | if (page->freelist == freelist_old && page->counters == counters_old) { |
| 375 | page->freelist = freelist_new; |
| 376 | page->counters = counters_new; |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 377 | slab_unlock(page); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 378 | return 1; |
| 379 | } |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 380 | slab_unlock(page); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 381 | } |
| 382 | |
| 383 | cpu_relax(); |
| 384 | stat(s, CMPXCHG_DOUBLE_FAIL); |
| 385 | |
| 386 | #ifdef SLUB_DEBUG_CMPXCHG |
| 387 | printk(KERN_INFO "%s %s: cmpxchg double redo ", n, s->name); |
| 388 | #endif |
| 389 | |
| 390 | return 0; |
| 391 | } |
| 392 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 393 | static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page, |
| 394 | void *freelist_old, unsigned long counters_old, |
| 395 | void *freelist_new, unsigned long counters_new, |
| 396 | const char *n) |
| 397 | { |
| 398 | #ifdef CONFIG_CMPXCHG_DOUBLE |
| 399 | if (s->flags & __CMPXCHG_DOUBLE) { |
| 400 | if (cmpxchg_double(&page->freelist, |
| 401 | freelist_old, counters_old, |
| 402 | freelist_new, counters_new)) |
| 403 | return 1; |
| 404 | } else |
| 405 | #endif |
| 406 | { |
| 407 | unsigned long flags; |
| 408 | |
| 409 | local_irq_save(flags); |
| 410 | slab_lock(page); |
| 411 | if (page->freelist == freelist_old && page->counters == counters_old) { |
| 412 | page->freelist = freelist_new; |
| 413 | page->counters = counters_new; |
| 414 | slab_unlock(page); |
| 415 | local_irq_restore(flags); |
| 416 | return 1; |
| 417 | } |
| 418 | slab_unlock(page); |
| 419 | local_irq_restore(flags); |
| 420 | } |
| 421 | |
| 422 | cpu_relax(); |
| 423 | stat(s, CMPXCHG_DOUBLE_FAIL); |
| 424 | |
| 425 | #ifdef SLUB_DEBUG_CMPXCHG |
| 426 | printk(KERN_INFO "%s %s: cmpxchg double redo ", n, s->name); |
| 427 | #endif |
| 428 | |
| 429 | return 0; |
| 430 | } |
| 431 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 432 | #ifdef CONFIG_SLUB_DEBUG |
| 433 | /* |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 434 | * Determine a map of object in use on a page. |
| 435 | * |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 436 | * Node listlock must be held to guarantee that the page does |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 437 | * not vanish from under us. |
| 438 | */ |
| 439 | static void get_map(struct kmem_cache *s, struct page *page, unsigned long *map) |
| 440 | { |
| 441 | void *p; |
| 442 | void *addr = page_address(page); |
| 443 | |
| 444 | for (p = page->freelist; p; p = get_freepointer(s, p)) |
| 445 | set_bit(slab_index(p, s, addr), map); |
| 446 | } |
| 447 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 448 | /* |
| 449 | * Debug settings: |
| 450 | */ |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 451 | #ifdef CONFIG_SLUB_DEBUG_ON |
| 452 | static int slub_debug = DEBUG_DEFAULT_FLAGS; |
| 453 | #else |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 454 | static int slub_debug; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 455 | #endif |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 456 | |
| 457 | static char *slub_debug_slabs; |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 458 | static int disable_higher_order_debug; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 459 | |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 460 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 461 | * Object debugging |
| 462 | */ |
| 463 | static void print_section(char *text, u8 *addr, unsigned int length) |
| 464 | { |
| 465 | int i, offset; |
| 466 | int newline = 1; |
| 467 | char ascii[17]; |
| 468 | |
| 469 | ascii[16] = 0; |
| 470 | |
| 471 | for (i = 0; i < length; i++) { |
| 472 | if (newline) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 473 | printk(KERN_ERR "%8s 0x%p: ", text, addr + i); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 474 | newline = 0; |
| 475 | } |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 476 | printk(KERN_CONT " %02x", addr[i]); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 477 | offset = i % 16; |
| 478 | ascii[offset] = isgraph(addr[i]) ? addr[i] : '.'; |
| 479 | if (offset == 15) { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 480 | printk(KERN_CONT " %s\n", ascii); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 481 | newline = 1; |
| 482 | } |
| 483 | } |
| 484 | if (!newline) { |
| 485 | i %= 16; |
| 486 | while (i < 16) { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 487 | printk(KERN_CONT " "); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 488 | ascii[i] = ' '; |
| 489 | i++; |
| 490 | } |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 491 | printk(KERN_CONT " %s\n", ascii); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 492 | } |
| 493 | } |
| 494 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 495 | static struct track *get_track(struct kmem_cache *s, void *object, |
| 496 | enum track_item alloc) |
| 497 | { |
| 498 | struct track *p; |
| 499 | |
| 500 | if (s->offset) |
| 501 | p = object + s->offset + sizeof(void *); |
| 502 | else |
| 503 | p = object + s->inuse; |
| 504 | |
| 505 | return p + alloc; |
| 506 | } |
| 507 | |
| 508 | static void set_track(struct kmem_cache *s, void *object, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 509 | enum track_item alloc, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 510 | { |
Akinobu Mita | 1a00df4 | 2009-03-07 00:36:21 +0900 | [diff] [blame] | 511 | struct track *p = get_track(s, object, alloc); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 512 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 513 | if (addr) { |
| 514 | p->addr = addr; |
| 515 | p->cpu = smp_processor_id(); |
Alexey Dobriyan | 88e4ccf | 2008-06-23 02:58:37 +0400 | [diff] [blame] | 516 | p->pid = current->pid; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 517 | p->when = jiffies; |
| 518 | } else |
| 519 | memset(p, 0, sizeof(struct track)); |
| 520 | } |
| 521 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 522 | static void init_tracking(struct kmem_cache *s, void *object) |
| 523 | { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 524 | if (!(s->flags & SLAB_STORE_USER)) |
| 525 | return; |
| 526 | |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 527 | set_track(s, object, TRACK_FREE, 0UL); |
| 528 | set_track(s, object, TRACK_ALLOC, 0UL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | static void print_track(const char *s, struct track *t) |
| 532 | { |
| 533 | if (!t->addr) |
| 534 | return; |
| 535 | |
Linus Torvalds | 7daf705 | 2008-07-14 12:12:53 -0700 | [diff] [blame] | 536 | printk(KERN_ERR "INFO: %s in %pS age=%lu cpu=%u pid=%d\n", |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 537 | s, (void *)t->addr, jiffies - t->when, t->cpu, t->pid); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 538 | } |
| 539 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 540 | static void print_tracking(struct kmem_cache *s, void *object) |
| 541 | { |
| 542 | if (!(s->flags & SLAB_STORE_USER)) |
| 543 | return; |
| 544 | |
| 545 | print_track("Allocated", get_track(s, object, TRACK_ALLOC)); |
| 546 | print_track("Freed", get_track(s, object, TRACK_FREE)); |
| 547 | } |
| 548 | |
| 549 | static void print_page_info(struct page *page) |
| 550 | { |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 551 | printk(KERN_ERR "INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n", |
| 552 | page, page->objects, page->inuse, page->freelist, page->flags); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 553 | |
| 554 | } |
| 555 | |
| 556 | static void slab_bug(struct kmem_cache *s, char *fmt, ...) |
| 557 | { |
| 558 | va_list args; |
| 559 | char buf[100]; |
| 560 | |
| 561 | va_start(args, fmt); |
| 562 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 563 | va_end(args); |
| 564 | printk(KERN_ERR "========================================" |
| 565 | "=====================================\n"); |
| 566 | printk(KERN_ERR "BUG %s: %s\n", s->name, buf); |
| 567 | printk(KERN_ERR "----------------------------------------" |
| 568 | "-------------------------------------\n\n"); |
| 569 | } |
| 570 | |
| 571 | static void slab_fix(struct kmem_cache *s, char *fmt, ...) |
| 572 | { |
| 573 | va_list args; |
| 574 | char buf[100]; |
| 575 | |
| 576 | va_start(args, fmt); |
| 577 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 578 | va_end(args); |
| 579 | printk(KERN_ERR "FIX %s: %s\n", s->name, buf); |
| 580 | } |
| 581 | |
| 582 | static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 583 | { |
| 584 | unsigned int off; /* Offset of last byte */ |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 585 | u8 *addr = page_address(page); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 586 | |
| 587 | print_tracking(s, p); |
| 588 | |
| 589 | print_page_info(page); |
| 590 | |
| 591 | printk(KERN_ERR "INFO: Object 0x%p @offset=%tu fp=0x%p\n\n", |
| 592 | p, p - addr, get_freepointer(s, p)); |
| 593 | |
| 594 | if (p > addr + 16) |
| 595 | print_section("Bytes b4", p - 16, 16); |
| 596 | |
Pekka Enberg | 0ebd652 | 2008-07-19 14:17:22 +0300 | [diff] [blame] | 597 | print_section("Object", p, min_t(unsigned long, s->objsize, PAGE_SIZE)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 598 | |
| 599 | if (s->flags & SLAB_RED_ZONE) |
| 600 | print_section("Redzone", p + s->objsize, |
| 601 | s->inuse - s->objsize); |
| 602 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 603 | if (s->offset) |
| 604 | off = s->offset + sizeof(void *); |
| 605 | else |
| 606 | off = s->inuse; |
| 607 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 608 | if (s->flags & SLAB_STORE_USER) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 609 | off += 2 * sizeof(struct track); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 610 | |
| 611 | if (off != s->size) |
| 612 | /* Beginning of the filler is the free pointer */ |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 613 | print_section("Padding", p + off, s->size - off); |
| 614 | |
| 615 | dump_stack(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 616 | } |
| 617 | |
| 618 | static void object_err(struct kmem_cache *s, struct page *page, |
| 619 | u8 *object, char *reason) |
| 620 | { |
Christoph Lameter | 3dc5063 | 2008-04-23 12:28:01 -0700 | [diff] [blame] | 621 | slab_bug(s, "%s", reason); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 622 | print_trailer(s, page, object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 623 | } |
| 624 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 625 | static void slab_err(struct kmem_cache *s, struct page *page, char *fmt, ...) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 626 | { |
| 627 | va_list args; |
| 628 | char buf[100]; |
| 629 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 630 | va_start(args, fmt); |
| 631 | vsnprintf(buf, sizeof(buf), fmt, args); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 632 | va_end(args); |
Christoph Lameter | 3dc5063 | 2008-04-23 12:28:01 -0700 | [diff] [blame] | 633 | slab_bug(s, "%s", buf); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 634 | print_page_info(page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 635 | dump_stack(); |
| 636 | } |
| 637 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 638 | static void init_object(struct kmem_cache *s, void *object, u8 val) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 639 | { |
| 640 | u8 *p = object; |
| 641 | |
| 642 | if (s->flags & __OBJECT_POISON) { |
| 643 | memset(p, POISON_FREE, s->objsize - 1); |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 644 | p[s->objsize - 1] = POISON_END; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 645 | } |
| 646 | |
| 647 | if (s->flags & SLAB_RED_ZONE) |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 648 | memset(p + s->objsize, val, s->inuse - s->objsize); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 649 | } |
| 650 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 651 | static u8 *check_bytes(u8 *start, unsigned int value, unsigned int bytes) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 652 | { |
| 653 | while (bytes) { |
| 654 | if (*start != (u8)value) |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 655 | return start; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 656 | start++; |
| 657 | bytes--; |
| 658 | } |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 659 | return NULL; |
| 660 | } |
| 661 | |
| 662 | static void restore_bytes(struct kmem_cache *s, char *message, u8 data, |
| 663 | void *from, void *to) |
| 664 | { |
| 665 | slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data); |
| 666 | memset(from, data, to - from); |
| 667 | } |
| 668 | |
| 669 | static int check_bytes_and_report(struct kmem_cache *s, struct page *page, |
| 670 | u8 *object, char *what, |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 671 | u8 *start, unsigned int value, unsigned int bytes) |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 672 | { |
| 673 | u8 *fault; |
| 674 | u8 *end; |
| 675 | |
| 676 | fault = check_bytes(start, value, bytes); |
| 677 | if (!fault) |
| 678 | return 1; |
| 679 | |
| 680 | end = start + bytes; |
| 681 | while (end > fault && end[-1] == value) |
| 682 | end--; |
| 683 | |
| 684 | slab_bug(s, "%s overwritten", what); |
| 685 | printk(KERN_ERR "INFO: 0x%p-0x%p. First byte 0x%x instead of 0x%x\n", |
| 686 | fault, end - 1, fault[0], value); |
| 687 | print_trailer(s, page, object); |
| 688 | |
| 689 | restore_bytes(s, what, value, fault, end); |
| 690 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 691 | } |
| 692 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 693 | /* |
| 694 | * Object layout: |
| 695 | * |
| 696 | * object address |
| 697 | * Bytes of the object to be managed. |
| 698 | * If the freepointer may overlay the object then the free |
| 699 | * pointer is the first word of the object. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 700 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 701 | * Poisoning uses 0x6b (POISON_FREE) and the last byte is |
| 702 | * 0xa5 (POISON_END) |
| 703 | * |
| 704 | * object + s->objsize |
| 705 | * Padding to reach word boundary. This is also used for Redzoning. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 706 | * Padding is extended by another word if Redzoning is enabled and |
| 707 | * objsize == inuse. |
| 708 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 709 | * We fill with 0xbb (RED_INACTIVE) for inactive objects and with |
| 710 | * 0xcc (RED_ACTIVE) for objects in use. |
| 711 | * |
| 712 | * object + s->inuse |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 713 | * Meta data starts here. |
| 714 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 715 | * A. Free pointer (if we cannot overwrite object on free) |
| 716 | * B. Tracking data for SLAB_STORE_USER |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 717 | * C. Padding to reach required alignment boundary or at mininum |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 718 | * one word if debugging is on to be able to detect writes |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 719 | * before the word boundary. |
| 720 | * |
| 721 | * Padding is done using 0x5a (POISON_INUSE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 722 | * |
| 723 | * object + s->size |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 724 | * Nothing is used beyond s->size. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 725 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 726 | * If slabcaches are merged then the objsize and inuse boundaries are mostly |
| 727 | * ignored. And therefore no slab options that rely on these boundaries |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 728 | * may be used with merged slabcaches. |
| 729 | */ |
| 730 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 731 | static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p) |
| 732 | { |
| 733 | unsigned long off = s->inuse; /* The end of info */ |
| 734 | |
| 735 | if (s->offset) |
| 736 | /* Freepointer is placed after the object. */ |
| 737 | off += sizeof(void *); |
| 738 | |
| 739 | if (s->flags & SLAB_STORE_USER) |
| 740 | /* We also have user information there */ |
| 741 | off += 2 * sizeof(struct track); |
| 742 | |
| 743 | if (s->size == off) |
| 744 | return 1; |
| 745 | |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 746 | return check_bytes_and_report(s, page, p, "Object padding", |
| 747 | p + off, POISON_INUSE, s->size - off); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 748 | } |
| 749 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 750 | /* Check the pad bytes at the end of a slab page */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 751 | static int slab_pad_check(struct kmem_cache *s, struct page *page) |
| 752 | { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 753 | u8 *start; |
| 754 | u8 *fault; |
| 755 | u8 *end; |
| 756 | int length; |
| 757 | int remainder; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 758 | |
| 759 | if (!(s->flags & SLAB_POISON)) |
| 760 | return 1; |
| 761 | |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 762 | start = page_address(page); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 763 | length = (PAGE_SIZE << compound_order(page)) - s->reserved; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 764 | end = start + length; |
| 765 | remainder = length % s->size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 766 | if (!remainder) |
| 767 | return 1; |
| 768 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 769 | fault = check_bytes(end - remainder, POISON_INUSE, remainder); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 770 | if (!fault) |
| 771 | return 1; |
| 772 | while (end > fault && end[-1] == POISON_INUSE) |
| 773 | end--; |
| 774 | |
| 775 | slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 776 | print_section("Padding", end - remainder, remainder); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 777 | |
Eric Dumazet | 8a3d271 | 2009-09-03 16:08:06 +0200 | [diff] [blame] | 778 | restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end); |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 779 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 780 | } |
| 781 | |
| 782 | static int check_object(struct kmem_cache *s, struct page *page, |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 783 | void *object, u8 val) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 784 | { |
| 785 | u8 *p = object; |
| 786 | u8 *endobject = object + s->objsize; |
| 787 | |
| 788 | if (s->flags & SLAB_RED_ZONE) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 789 | if (!check_bytes_and_report(s, page, object, "Redzone", |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 790 | endobject, val, s->inuse - s->objsize)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 791 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 792 | } else { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 793 | if ((s->flags & SLAB_POISON) && s->objsize < s->inuse) { |
| 794 | check_bytes_and_report(s, page, p, "Alignment padding", |
| 795 | endobject, POISON_INUSE, s->inuse - s->objsize); |
| 796 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 797 | } |
| 798 | |
| 799 | if (s->flags & SLAB_POISON) { |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 800 | if (val != SLUB_RED_ACTIVE && (s->flags & __OBJECT_POISON) && |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 801 | (!check_bytes_and_report(s, page, p, "Poison", p, |
| 802 | POISON_FREE, s->objsize - 1) || |
| 803 | !check_bytes_and_report(s, page, p, "Poison", |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 804 | p + s->objsize - 1, POISON_END, 1))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 805 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 806 | /* |
| 807 | * check_pad_bytes cleans up on its own. |
| 808 | */ |
| 809 | check_pad_bytes(s, page, p); |
| 810 | } |
| 811 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 812 | if (!s->offset && val == SLUB_RED_ACTIVE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 813 | /* |
| 814 | * Object and freepointer overlap. Cannot check |
| 815 | * freepointer while object is allocated. |
| 816 | */ |
| 817 | return 1; |
| 818 | |
| 819 | /* Check free pointer validity */ |
| 820 | if (!check_valid_pointer(s, page, get_freepointer(s, p))) { |
| 821 | object_err(s, page, p, "Freepointer corrupt"); |
| 822 | /* |
Nick Andrew | 9f6c708e | 2008-12-05 14:08:08 +1100 | [diff] [blame] | 823 | * No choice but to zap it and thus lose the remainder |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 824 | * of the free objects in this slab. May cause |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 825 | * another error because the object count is now wrong. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 826 | */ |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 827 | set_freepointer(s, p, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 828 | return 0; |
| 829 | } |
| 830 | return 1; |
| 831 | } |
| 832 | |
| 833 | static int check_slab(struct kmem_cache *s, struct page *page) |
| 834 | { |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 835 | int maxobj; |
| 836 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 837 | VM_BUG_ON(!irqs_disabled()); |
| 838 | |
| 839 | if (!PageSlab(page)) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 840 | slab_err(s, page, "Not a valid slab page"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 841 | return 0; |
| 842 | } |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 843 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 844 | maxobj = order_objects(compound_order(page), s->size, s->reserved); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 845 | if (page->objects > maxobj) { |
| 846 | slab_err(s, page, "objects %u > max %u", |
| 847 | s->name, page->objects, maxobj); |
| 848 | return 0; |
| 849 | } |
| 850 | if (page->inuse > page->objects) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 851 | slab_err(s, page, "inuse %u > max %u", |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 852 | s->name, page->inuse, page->objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 853 | return 0; |
| 854 | } |
| 855 | /* Slab_pad_check fixes things up after itself */ |
| 856 | slab_pad_check(s, page); |
| 857 | return 1; |
| 858 | } |
| 859 | |
| 860 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 861 | * Determine if a certain object on a page is on the freelist. Must hold the |
| 862 | * slab lock to guarantee that the chains are in a consistent state. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 863 | */ |
| 864 | static int on_freelist(struct kmem_cache *s, struct page *page, void *search) |
| 865 | { |
| 866 | int nr = 0; |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 867 | void *fp; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 868 | void *object = NULL; |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 869 | unsigned long max_objects; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 870 | |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 871 | fp = page->freelist; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 872 | while (fp && nr <= page->objects) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 873 | if (fp == search) |
| 874 | return 1; |
| 875 | if (!check_valid_pointer(s, page, fp)) { |
| 876 | if (object) { |
| 877 | object_err(s, page, object, |
| 878 | "Freechain corrupt"); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 879 | set_freepointer(s, object, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 880 | break; |
| 881 | } else { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 882 | slab_err(s, page, "Freepointer corrupt"); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 883 | page->freelist = NULL; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 884 | page->inuse = page->objects; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 885 | slab_fix(s, "Freelist cleared"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 886 | return 0; |
| 887 | } |
| 888 | break; |
| 889 | } |
| 890 | object = fp; |
| 891 | fp = get_freepointer(s, object); |
| 892 | nr++; |
| 893 | } |
| 894 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 895 | max_objects = order_objects(compound_order(page), s->size, s->reserved); |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 896 | if (max_objects > MAX_OBJS_PER_PAGE) |
| 897 | max_objects = MAX_OBJS_PER_PAGE; |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 898 | |
| 899 | if (page->objects != max_objects) { |
| 900 | slab_err(s, page, "Wrong number of objects. Found %d but " |
| 901 | "should be %d", page->objects, max_objects); |
| 902 | page->objects = max_objects; |
| 903 | slab_fix(s, "Number of objects adjusted."); |
| 904 | } |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 905 | if (page->inuse != page->objects - nr) { |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 906 | slab_err(s, page, "Wrong object count. Counter is %d but " |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 907 | "counted were %d", page->inuse, page->objects - nr); |
| 908 | page->inuse = page->objects - nr; |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 909 | slab_fix(s, "Object count adjusted."); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 910 | } |
| 911 | return search == NULL; |
| 912 | } |
| 913 | |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 914 | static void trace(struct kmem_cache *s, struct page *page, void *object, |
| 915 | int alloc) |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 916 | { |
| 917 | if (s->flags & SLAB_TRACE) { |
| 918 | printk(KERN_INFO "TRACE %s %s 0x%p inuse=%d fp=0x%p\n", |
| 919 | s->name, |
| 920 | alloc ? "alloc" : "free", |
| 921 | object, page->inuse, |
| 922 | page->freelist); |
| 923 | |
| 924 | if (!alloc) |
| 925 | print_section("Object", (void *)object, s->objsize); |
| 926 | |
| 927 | dump_stack(); |
| 928 | } |
| 929 | } |
| 930 | |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 931 | /* |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 932 | * Hooks for other subsystems that check memory allocations. In a typical |
| 933 | * production configuration these hooks all should produce no code at all. |
| 934 | */ |
| 935 | static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags) |
| 936 | { |
Christoph Lameter | c1d5083 | 2010-08-20 12:37:17 -0500 | [diff] [blame] | 937 | flags &= gfp_allowed_mask; |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 938 | lockdep_trace_alloc(flags); |
| 939 | might_sleep_if(flags & __GFP_WAIT); |
| 940 | |
| 941 | return should_failslab(s->objsize, flags, s->flags); |
| 942 | } |
| 943 | |
| 944 | static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, void *object) |
| 945 | { |
Christoph Lameter | c1d5083 | 2010-08-20 12:37:17 -0500 | [diff] [blame] | 946 | flags &= gfp_allowed_mask; |
Eric Dumazet | b3d4188 | 2011-02-14 18:35:22 +0100 | [diff] [blame] | 947 | kmemcheck_slab_alloc(s, flags, object, slab_ksize(s)); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 948 | kmemleak_alloc_recursive(object, s->objsize, 1, s->flags, flags); |
| 949 | } |
| 950 | |
| 951 | static inline void slab_free_hook(struct kmem_cache *s, void *x) |
| 952 | { |
| 953 | kmemleak_free_recursive(x, s->flags); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 954 | |
Christoph Lameter | d3f661d | 2011-02-25 11:38:52 -0600 | [diff] [blame] | 955 | /* |
| 956 | * Trouble is that we may no longer disable interupts in the fast path |
| 957 | * So in order to make the debug calls that expect irqs to be |
| 958 | * disabled we need to disable interrupts temporarily. |
| 959 | */ |
| 960 | #if defined(CONFIG_KMEMCHECK) || defined(CONFIG_LOCKDEP) |
| 961 | { |
| 962 | unsigned long flags; |
| 963 | |
| 964 | local_irq_save(flags); |
| 965 | kmemcheck_slab_free(s, x, s->objsize); |
| 966 | debug_check_no_locks_freed(x, s->objsize); |
Christoph Lameter | d3f661d | 2011-02-25 11:38:52 -0600 | [diff] [blame] | 967 | local_irq_restore(flags); |
| 968 | } |
| 969 | #endif |
Thomas Gleixner | f9b615d | 2011-03-24 21:26:46 +0200 | [diff] [blame] | 970 | if (!(s->flags & SLAB_DEBUG_OBJECTS)) |
| 971 | debug_check_no_obj_freed(x, s->objsize); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 975 | * Tracking of fully allocated slabs for debugging purposes. |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 976 | * |
| 977 | * list_lock must be held. |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 978 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 979 | static void add_full(struct kmem_cache *s, |
| 980 | struct kmem_cache_node *n, struct page *page) |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 981 | { |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 982 | if (!(s->flags & SLAB_STORE_USER)) |
| 983 | return; |
| 984 | |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 985 | list_add(&page->lru, &n->full); |
| 986 | } |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 987 | |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 988 | /* |
| 989 | * list_lock must be held. |
| 990 | */ |
| 991 | static void remove_full(struct kmem_cache *s, struct page *page) |
| 992 | { |
| 993 | if (!(s->flags & SLAB_STORE_USER)) |
| 994 | return; |
| 995 | |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 996 | list_del(&page->lru); |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 997 | } |
| 998 | |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 999 | /* Tracking of the number of slabs for debugging purposes */ |
| 1000 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
| 1001 | { |
| 1002 | struct kmem_cache_node *n = get_node(s, node); |
| 1003 | |
| 1004 | return atomic_long_read(&n->nr_slabs); |
| 1005 | } |
| 1006 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1007 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
| 1008 | { |
| 1009 | return atomic_long_read(&n->nr_slabs); |
| 1010 | } |
| 1011 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1012 | static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects) |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1013 | { |
| 1014 | struct kmem_cache_node *n = get_node(s, node); |
| 1015 | |
| 1016 | /* |
| 1017 | * May be called early in order to allocate a slab for the |
| 1018 | * kmem_cache_node structure. Solve the chicken-egg |
| 1019 | * dilemma by deferring the increment of the count during |
| 1020 | * bootstrap (see early_kmem_cache_node_alloc). |
| 1021 | */ |
Christoph Lameter | 7340cc8 | 2010-09-28 08:10:26 -0500 | [diff] [blame] | 1022 | if (n) { |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1023 | atomic_long_inc(&n->nr_slabs); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1024 | atomic_long_add(objects, &n->total_objects); |
| 1025 | } |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1026 | } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1027 | static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects) |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1028 | { |
| 1029 | struct kmem_cache_node *n = get_node(s, node); |
| 1030 | |
| 1031 | atomic_long_dec(&n->nr_slabs); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1032 | atomic_long_sub(objects, &n->total_objects); |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1033 | } |
| 1034 | |
| 1035 | /* Object debug checks for alloc/free paths */ |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1036 | static void setup_object_debug(struct kmem_cache *s, struct page *page, |
| 1037 | void *object) |
| 1038 | { |
| 1039 | if (!(s->flags & (SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON))) |
| 1040 | return; |
| 1041 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1042 | init_object(s, object, SLUB_RED_INACTIVE); |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1043 | init_tracking(s, object); |
| 1044 | } |
| 1045 | |
Christoph Lameter | 1537066 | 2010-08-20 12:37:12 -0500 | [diff] [blame] | 1046 | static noinline int alloc_debug_processing(struct kmem_cache *s, struct page *page, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1047 | void *object, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1048 | { |
| 1049 | if (!check_slab(s, page)) |
| 1050 | goto bad; |
| 1051 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1052 | if (!check_valid_pointer(s, page, object)) { |
| 1053 | object_err(s, page, object, "Freelist Pointer check fails"); |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1054 | goto bad; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1055 | } |
| 1056 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1057 | if (!check_object(s, page, object, SLUB_RED_INACTIVE)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1058 | goto bad; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1059 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1060 | /* Success perform special debug activities for allocs */ |
| 1061 | if (s->flags & SLAB_STORE_USER) |
| 1062 | set_track(s, object, TRACK_ALLOC, addr); |
| 1063 | trace(s, page, object, 1); |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1064 | init_object(s, object, SLUB_RED_ACTIVE); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1065 | return 1; |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1066 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1067 | bad: |
| 1068 | if (PageSlab(page)) { |
| 1069 | /* |
| 1070 | * If this is a slab page then lets do the best we can |
| 1071 | * to avoid issues in the future. Marking all objects |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1072 | * as used avoids touching the remaining objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1073 | */ |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1074 | slab_fix(s, "Marking all objects used"); |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 1075 | page->inuse = page->objects; |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 1076 | page->freelist = NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1077 | } |
| 1078 | return 0; |
| 1079 | } |
| 1080 | |
Christoph Lameter | 1537066 | 2010-08-20 12:37:12 -0500 | [diff] [blame] | 1081 | static noinline int free_debug_processing(struct kmem_cache *s, |
| 1082 | struct page *page, void *object, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1083 | { |
Christoph Lameter | 5c2e4bb | 2011-06-01 12:25:54 -0500 | [diff] [blame] | 1084 | unsigned long flags; |
| 1085 | int rc = 0; |
| 1086 | |
| 1087 | local_irq_save(flags); |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 1088 | slab_lock(page); |
| 1089 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1090 | if (!check_slab(s, page)) |
| 1091 | goto fail; |
| 1092 | |
| 1093 | if (!check_valid_pointer(s, page, object)) { |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1094 | slab_err(s, page, "Invalid object pointer 0x%p", object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1095 | goto fail; |
| 1096 | } |
| 1097 | |
| 1098 | if (on_freelist(s, page, object)) { |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1099 | object_err(s, page, object, "Object already free"); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1100 | goto fail; |
| 1101 | } |
| 1102 | |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1103 | if (!check_object(s, page, object, SLUB_RED_ACTIVE)) |
Christoph Lameter | 5c2e4bb | 2011-06-01 12:25:54 -0500 | [diff] [blame] | 1104 | goto out; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1105 | |
| 1106 | if (unlikely(s != page->slab)) { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 1107 | if (!PageSlab(page)) { |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1108 | slab_err(s, page, "Attempt to free object(0x%p) " |
| 1109 | "outside of slab", object); |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 1110 | } else if (!page->slab) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1111 | printk(KERN_ERR |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1112 | "SLUB <none>: no slab for object 0x%p.\n", |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1113 | object); |
Christoph Lameter | 70d7122 | 2007-05-06 14:49:47 -0700 | [diff] [blame] | 1114 | dump_stack(); |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1115 | } else |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1116 | object_err(s, page, object, |
| 1117 | "page slab pointer corrupt."); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1118 | goto fail; |
| 1119 | } |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1120 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1121 | if (s->flags & SLAB_STORE_USER) |
| 1122 | set_track(s, object, TRACK_FREE, addr); |
| 1123 | trace(s, page, object, 0); |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1124 | init_object(s, object, SLUB_RED_INACTIVE); |
Christoph Lameter | 5c2e4bb | 2011-06-01 12:25:54 -0500 | [diff] [blame] | 1125 | rc = 1; |
| 1126 | out: |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 1127 | slab_unlock(page); |
Christoph Lameter | 5c2e4bb | 2011-06-01 12:25:54 -0500 | [diff] [blame] | 1128 | local_irq_restore(flags); |
| 1129 | return rc; |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1130 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1131 | fail: |
Christoph Lameter | 2492268 | 2007-07-17 04:03:18 -0700 | [diff] [blame] | 1132 | slab_fix(s, "Object at 0x%p not freed", object); |
Christoph Lameter | 5c2e4bb | 2011-06-01 12:25:54 -0500 | [diff] [blame] | 1133 | goto out; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1134 | } |
| 1135 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1136 | static int __init setup_slub_debug(char *str) |
| 1137 | { |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1138 | slub_debug = DEBUG_DEFAULT_FLAGS; |
| 1139 | if (*str++ != '=' || !*str) |
| 1140 | /* |
| 1141 | * No options specified. Switch on full debugging. |
| 1142 | */ |
| 1143 | goto out; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1144 | |
| 1145 | if (*str == ',') |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1146 | /* |
| 1147 | * No options but restriction on slabs. This means full |
| 1148 | * debugging for slabs matching a pattern. |
| 1149 | */ |
| 1150 | goto check_slabs; |
| 1151 | |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 1152 | if (tolower(*str) == 'o') { |
| 1153 | /* |
| 1154 | * Avoid enabling debugging on caches if its minimum order |
| 1155 | * would increase as a result. |
| 1156 | */ |
| 1157 | disable_higher_order_debug = 1; |
| 1158 | goto out; |
| 1159 | } |
| 1160 | |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1161 | slub_debug = 0; |
| 1162 | if (*str == '-') |
| 1163 | /* |
| 1164 | * Switch off all debugging measures. |
| 1165 | */ |
| 1166 | goto out; |
| 1167 | |
| 1168 | /* |
| 1169 | * Determine which debug features should be switched on |
| 1170 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1171 | for (; *str && *str != ','; str++) { |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1172 | switch (tolower(*str)) { |
| 1173 | case 'f': |
| 1174 | slub_debug |= SLAB_DEBUG_FREE; |
| 1175 | break; |
| 1176 | case 'z': |
| 1177 | slub_debug |= SLAB_RED_ZONE; |
| 1178 | break; |
| 1179 | case 'p': |
| 1180 | slub_debug |= SLAB_POISON; |
| 1181 | break; |
| 1182 | case 'u': |
| 1183 | slub_debug |= SLAB_STORE_USER; |
| 1184 | break; |
| 1185 | case 't': |
| 1186 | slub_debug |= SLAB_TRACE; |
| 1187 | break; |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 1188 | case 'a': |
| 1189 | slub_debug |= SLAB_FAILSLAB; |
| 1190 | break; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1191 | default: |
| 1192 | printk(KERN_ERR "slub_debug option '%c' " |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1193 | "unknown. skipped\n", *str); |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | check_slabs: |
| 1198 | if (*str == ',') |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1199 | slub_debug_slabs = str + 1; |
Christoph Lameter | f0630ff | 2007-07-15 23:38:14 -0700 | [diff] [blame] | 1200 | out: |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1201 | return 1; |
| 1202 | } |
| 1203 | |
| 1204 | __setup("slub_debug", setup_slub_debug); |
| 1205 | |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1206 | static unsigned long kmem_cache_flags(unsigned long objsize, |
| 1207 | unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1208 | void (*ctor)(void *)) |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1209 | { |
| 1210 | /* |
Christoph Lameter | e153362 | 2008-02-15 23:45:24 -0800 | [diff] [blame] | 1211 | * Enable debugging if selected on the kernel commandline. |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1212 | */ |
Christoph Lameter | e153362 | 2008-02-15 23:45:24 -0800 | [diff] [blame] | 1213 | if (slub_debug && (!slub_debug_slabs || |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 1214 | !strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs)))) |
| 1215 | flags |= slub_debug; |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1216 | |
| 1217 | return flags; |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1218 | } |
| 1219 | #else |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1220 | static inline void setup_object_debug(struct kmem_cache *s, |
| 1221 | struct page *page, void *object) {} |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1222 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1223 | static inline int alloc_debug_processing(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1224 | struct page *page, void *object, unsigned long addr) { return 0; } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1225 | |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1226 | static inline int free_debug_processing(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1227 | struct page *page, void *object, unsigned long addr) { return 0; } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1228 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1229 | static inline int slab_pad_check(struct kmem_cache *s, struct page *page) |
| 1230 | { return 1; } |
| 1231 | static inline int check_object(struct kmem_cache *s, struct page *page, |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1232 | void *object, u8 val) { return 1; } |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1233 | static inline void add_full(struct kmem_cache *s, struct kmem_cache_node *n, |
| 1234 | struct page *page) {} |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1235 | static inline void remove_full(struct kmem_cache *s, struct page *page) {} |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1236 | static inline unsigned long kmem_cache_flags(unsigned long objsize, |
| 1237 | unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1238 | void (*ctor)(void *)) |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 1239 | { |
| 1240 | return flags; |
| 1241 | } |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 1242 | #define slub_debug 0 |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1243 | |
Ingo Molnar | fdaa45e | 2009-09-15 11:00:26 +0200 | [diff] [blame] | 1244 | #define disable_higher_order_debug 0 |
| 1245 | |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 1246 | static inline unsigned long slabs_node(struct kmem_cache *s, int node) |
| 1247 | { return 0; } |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1248 | static inline unsigned long node_nr_slabs(struct kmem_cache_node *n) |
| 1249 | { return 0; } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1250 | static inline void inc_slabs_node(struct kmem_cache *s, int node, |
| 1251 | int objects) {} |
| 1252 | static inline void dec_slabs_node(struct kmem_cache *s, int node, |
| 1253 | int objects) {} |
Christoph Lameter | 7d550c5 | 2010-08-25 14:07:16 -0500 | [diff] [blame] | 1254 | |
| 1255 | static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags) |
| 1256 | { return 0; } |
| 1257 | |
| 1258 | static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, |
| 1259 | void *object) {} |
| 1260 | |
| 1261 | static inline void slab_free_hook(struct kmem_cache *s, void *x) {} |
| 1262 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 1263 | #endif /* CONFIG_SLUB_DEBUG */ |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1264 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1265 | /* |
| 1266 | * Slab allocation and freeing |
| 1267 | */ |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1268 | static inline struct page *alloc_slab_page(gfp_t flags, int node, |
| 1269 | struct kmem_cache_order_objects oo) |
| 1270 | { |
| 1271 | int order = oo_order(oo); |
| 1272 | |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1273 | flags |= __GFP_NOTRACK; |
| 1274 | |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 1275 | if (node == NUMA_NO_NODE) |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1276 | return alloc_pages(flags, order); |
| 1277 | else |
Minchan Kim | 6b65aaf | 2010-04-14 23:58:36 +0900 | [diff] [blame] | 1278 | return alloc_pages_exact_node(node, flags, order); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1279 | } |
| 1280 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1281 | static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) |
| 1282 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1283 | struct page *page; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1284 | struct kmem_cache_order_objects oo = s->oo; |
Pekka Enberg | ba52270 | 2009-06-24 21:59:51 +0300 | [diff] [blame] | 1285 | gfp_t alloc_gfp; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1286 | |
Christoph Lameter | 7e0528d | 2011-06-01 12:25:44 -0500 | [diff] [blame] | 1287 | flags &= gfp_allowed_mask; |
| 1288 | |
| 1289 | if (flags & __GFP_WAIT) |
| 1290 | local_irq_enable(); |
| 1291 | |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 1292 | flags |= s->allocflags; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1293 | |
Pekka Enberg | ba52270 | 2009-06-24 21:59:51 +0300 | [diff] [blame] | 1294 | /* |
| 1295 | * Let the initial higher-order allocation fail under memory pressure |
| 1296 | * so we fall-back to the minimum order allocation. |
| 1297 | */ |
| 1298 | alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL; |
| 1299 | |
| 1300 | page = alloc_slab_page(alloc_gfp, node, oo); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1301 | if (unlikely(!page)) { |
| 1302 | oo = s->min; |
| 1303 | /* |
| 1304 | * Allocation may have failed due to fragmentation. |
| 1305 | * Try a lower order alloc if possible |
| 1306 | */ |
| 1307 | page = alloc_slab_page(flags, node, oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1308 | |
Christoph Lameter | 7e0528d | 2011-06-01 12:25:44 -0500 | [diff] [blame] | 1309 | if (page) |
| 1310 | stat(s, ORDER_FALLBACK); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1311 | } |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1312 | |
Christoph Lameter | 7e0528d | 2011-06-01 12:25:44 -0500 | [diff] [blame] | 1313 | if (flags & __GFP_WAIT) |
| 1314 | local_irq_disable(); |
| 1315 | |
| 1316 | if (!page) |
| 1317 | return NULL; |
| 1318 | |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1319 | if (kmemcheck_enabled |
Amerigo Wang | 5086c38 | 2009-08-19 21:44:13 +0300 | [diff] [blame] | 1320 | && !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) { |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1321 | int pages = 1 << oo_order(oo); |
| 1322 | |
| 1323 | kmemcheck_alloc_shadow(page, oo_order(oo), flags, node); |
| 1324 | |
| 1325 | /* |
| 1326 | * Objects from caches that have a constructor don't get |
| 1327 | * cleared when they're allocated, so we need to do it here. |
| 1328 | */ |
| 1329 | if (s->ctor) |
| 1330 | kmemcheck_mark_uninitialized_pages(page, pages); |
| 1331 | else |
| 1332 | kmemcheck_mark_unallocated_pages(page, pages); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1333 | } |
| 1334 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1335 | page->objects = oo_objects(oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1336 | mod_zone_page_state(page_zone(page), |
| 1337 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? |
| 1338 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1339 | 1 << oo_order(oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1340 | |
| 1341 | return page; |
| 1342 | } |
| 1343 | |
| 1344 | static void setup_object(struct kmem_cache *s, struct page *page, |
| 1345 | void *object) |
| 1346 | { |
Christoph Lameter | 3ec0974 | 2007-05-16 22:11:00 -0700 | [diff] [blame] | 1347 | setup_object_debug(s, page, object); |
Christoph Lameter | 4f10493 | 2007-05-06 14:50:17 -0700 | [diff] [blame] | 1348 | if (unlikely(s->ctor)) |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 1349 | s->ctor(object); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1350 | } |
| 1351 | |
| 1352 | static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) |
| 1353 | { |
| 1354 | struct page *page; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1355 | void *start; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1356 | void *last; |
| 1357 | void *p; |
| 1358 | |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 1359 | BUG_ON(flags & GFP_SLAB_BUG_MASK); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1360 | |
Christoph Lameter | 6cb0622 | 2007-10-16 01:25:41 -0700 | [diff] [blame] | 1361 | page = allocate_slab(s, |
| 1362 | flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1363 | if (!page) |
| 1364 | goto out; |
| 1365 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1366 | inc_slabs_node(s, page_to_nid(page), page->objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1367 | page->slab = s; |
| 1368 | page->flags |= 1 << PG_slab; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1369 | |
| 1370 | start = page_address(page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1371 | |
| 1372 | if (unlikely(s->flags & SLAB_POISON)) |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1373 | memset(start, POISON_INUSE, PAGE_SIZE << compound_order(page)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1374 | |
| 1375 | last = start; |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1376 | for_each_object(p, s, start, page->objects) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1377 | setup_object(s, page, last); |
| 1378 | set_freepointer(s, last, p); |
| 1379 | last = p; |
| 1380 | } |
| 1381 | setup_object(s, page, last); |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 1382 | set_freepointer(s, last, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1383 | |
| 1384 | page->freelist = start; |
| 1385 | page->inuse = 0; |
Christoph Lameter | 8cb0a50 | 2011-06-01 12:25:46 -0500 | [diff] [blame] | 1386 | page->frozen = 1; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1387 | out: |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1388 | return page; |
| 1389 | } |
| 1390 | |
| 1391 | static void __free_slab(struct kmem_cache *s, struct page *page) |
| 1392 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1393 | int order = compound_order(page); |
| 1394 | int pages = 1 << order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1395 | |
Christoph Lameter | af537b0 | 2010-07-09 14:07:14 -0500 | [diff] [blame] | 1396 | if (kmem_cache_debug(s)) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1397 | void *p; |
| 1398 | |
| 1399 | slab_pad_check(s, page); |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1400 | for_each_object(p, s, page_address(page), |
| 1401 | page->objects) |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 1402 | check_object(s, page, p, SLUB_RED_INACTIVE); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1403 | } |
| 1404 | |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 1405 | kmemcheck_free_shadow(page, compound_order(page)); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 1406 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1407 | mod_zone_page_state(page_zone(page), |
| 1408 | (s->flags & SLAB_RECLAIM_ACCOUNT) ? |
| 1409 | NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1410 | -pages); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1411 | |
Christoph Lameter | 49bd522 | 2008-04-14 18:52:18 +0300 | [diff] [blame] | 1412 | __ClearPageSlab(page); |
| 1413 | reset_page_mapcount(page); |
Nick Piggin | 1eb5ac6 | 2009-05-05 19:13:44 +1000 | [diff] [blame] | 1414 | if (current->reclaim_state) |
| 1415 | current->reclaim_state->reclaimed_slab += pages; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 1416 | __free_pages(page, order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1417 | } |
| 1418 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1419 | #define need_reserve_slab_rcu \ |
| 1420 | (sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head)) |
| 1421 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1422 | static void rcu_free_slab(struct rcu_head *h) |
| 1423 | { |
| 1424 | struct page *page; |
| 1425 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1426 | if (need_reserve_slab_rcu) |
| 1427 | page = virt_to_head_page(h); |
| 1428 | else |
| 1429 | page = container_of((struct list_head *)h, struct page, lru); |
| 1430 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1431 | __free_slab(page->slab, page); |
| 1432 | } |
| 1433 | |
| 1434 | static void free_slab(struct kmem_cache *s, struct page *page) |
| 1435 | { |
| 1436 | if (unlikely(s->flags & SLAB_DESTROY_BY_RCU)) { |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 1437 | struct rcu_head *head; |
| 1438 | |
| 1439 | if (need_reserve_slab_rcu) { |
| 1440 | int order = compound_order(page); |
| 1441 | int offset = (PAGE_SIZE << order) - s->reserved; |
| 1442 | |
| 1443 | VM_BUG_ON(s->reserved != sizeof(*head)); |
| 1444 | head = page_address(page) + offset; |
| 1445 | } else { |
| 1446 | /* |
| 1447 | * RCU free overloads the RCU head over the LRU |
| 1448 | */ |
| 1449 | head = (void *)&page->lru; |
| 1450 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1451 | |
| 1452 | call_rcu(head, rcu_free_slab); |
| 1453 | } else |
| 1454 | __free_slab(s, page); |
| 1455 | } |
| 1456 | |
| 1457 | static void discard_slab(struct kmem_cache *s, struct page *page) |
| 1458 | { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 1459 | dec_slabs_node(s, page_to_nid(page), page->objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1460 | free_slab(s, page); |
| 1461 | } |
| 1462 | |
| 1463 | /* |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1464 | * Management of partially allocated slabs. |
| 1465 | * |
| 1466 | * list_lock must be held. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1467 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1468 | static inline void add_partial(struct kmem_cache_node *n, |
Christoph Lameter | 7c2e132 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1469 | struct page *page, int tail) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1470 | { |
Christoph Lameter | e95eed5 | 2007-05-06 14:49:44 -0700 | [diff] [blame] | 1471 | n->nr_partial++; |
Christoph Lameter | 7c2e132 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 1472 | if (tail) |
| 1473 | list_add_tail(&page->lru, &n->partial); |
| 1474 | else |
| 1475 | list_add(&page->lru, &n->partial); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1476 | } |
| 1477 | |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1478 | /* |
| 1479 | * list_lock must be held. |
| 1480 | */ |
| 1481 | static inline void remove_partial(struct kmem_cache_node *n, |
Christoph Lameter | 62e346a | 2010-09-28 08:10:28 -0500 | [diff] [blame] | 1482 | struct page *page) |
| 1483 | { |
| 1484 | list_del(&page->lru); |
| 1485 | n->nr_partial--; |
| 1486 | } |
| 1487 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1488 | /* |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 1489 | * Lock slab, remove from the partial list and put the object into the |
| 1490 | * per cpu freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1491 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1492 | * Must hold list_lock. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1493 | */ |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 1494 | static inline int acquire_slab(struct kmem_cache *s, |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 1495 | struct kmem_cache_node *n, struct page *page) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1496 | { |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1497 | void *freelist; |
| 1498 | unsigned long counters; |
| 1499 | struct page new; |
| 1500 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1501 | /* |
| 1502 | * Zap the freelist and set the frozen bit. |
| 1503 | * The old freelist is the list of objects for the |
| 1504 | * per cpu allocation list. |
| 1505 | */ |
| 1506 | do { |
| 1507 | freelist = page->freelist; |
| 1508 | counters = page->counters; |
| 1509 | new.counters = counters; |
| 1510 | new.inuse = page->objects; |
| 1511 | |
| 1512 | VM_BUG_ON(new.frozen); |
| 1513 | new.frozen = 1; |
| 1514 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 1515 | } while (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1516 | freelist, counters, |
| 1517 | NULL, new.counters, |
| 1518 | "lock and freeze")); |
| 1519 | |
| 1520 | remove_partial(n, page); |
| 1521 | |
| 1522 | if (freelist) { |
| 1523 | /* Populate the per cpu freelist */ |
| 1524 | this_cpu_write(s->cpu_slab->freelist, freelist); |
| 1525 | this_cpu_write(s->cpu_slab->page, page); |
| 1526 | this_cpu_write(s->cpu_slab->node, page_to_nid(page)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1527 | return 1; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1528 | } else { |
| 1529 | /* |
| 1530 | * Slab page came from the wrong list. No object to allocate |
| 1531 | * from. Put it onto the correct list and continue partial |
| 1532 | * scan. |
| 1533 | */ |
| 1534 | printk(KERN_ERR "SLUB: %s : Page without available objects on" |
| 1535 | " partial list\n", s->name); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1536 | return 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1537 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1538 | } |
| 1539 | |
| 1540 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1541 | * Try to allocate a partial slab from a specific node. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1542 | */ |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 1543 | static struct page *get_partial_node(struct kmem_cache *s, |
| 1544 | struct kmem_cache_node *n) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1545 | { |
| 1546 | struct page *page; |
| 1547 | |
| 1548 | /* |
| 1549 | * Racy check. If we mistakenly see no partial slabs then we |
| 1550 | * just allocate an empty slab. If we mistakenly try to get a |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1551 | * partial slab and there is none available then get_partials() |
| 1552 | * will return NULL. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1553 | */ |
| 1554 | if (!n || !n->nr_partial) |
| 1555 | return NULL; |
| 1556 | |
| 1557 | spin_lock(&n->list_lock); |
| 1558 | list_for_each_entry(page, &n->partial, lru) |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 1559 | if (acquire_slab(s, n, page)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1560 | goto out; |
| 1561 | page = NULL; |
| 1562 | out: |
| 1563 | spin_unlock(&n->list_lock); |
| 1564 | return page; |
| 1565 | } |
| 1566 | |
| 1567 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1568 | * Get a page from somewhere. Search in increasing NUMA distances. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1569 | */ |
| 1570 | static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags) |
| 1571 | { |
| 1572 | #ifdef CONFIG_NUMA |
| 1573 | struct zonelist *zonelist; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1574 | struct zoneref *z; |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 1575 | struct zone *zone; |
| 1576 | enum zone_type high_zoneidx = gfp_zone(flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1577 | struct page *page; |
| 1578 | |
| 1579 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1580 | * The defrag ratio allows a configuration of the tradeoffs between |
| 1581 | * inter node defragmentation and node local allocations. A lower |
| 1582 | * defrag_ratio increases the tendency to do local allocations |
| 1583 | * instead of attempting to obtain partial slabs from other nodes. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1584 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1585 | * If the defrag_ratio is set to 0 then kmalloc() always |
| 1586 | * returns node local objects. If the ratio is higher then kmalloc() |
| 1587 | * may return off node objects because partial slabs are obtained |
| 1588 | * from other nodes and filled up. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1589 | * |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 1590 | * If /sys/kernel/slab/xx/defrag_ratio is set to 100 (which makes |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 1591 | * defrag_ratio = 1000) then every (well almost) allocation will |
| 1592 | * first attempt to defrag slab caches on other nodes. This means |
| 1593 | * scanning over all nodes to look for partial slabs which may be |
| 1594 | * expensive if we do it every time we are trying to find a slab |
| 1595 | * with available objects. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1596 | */ |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 1597 | if (!s->remote_node_defrag_ratio || |
| 1598 | get_cycles() % 1024 > s->remote_node_defrag_ratio) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1599 | return NULL; |
| 1600 | |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1601 | get_mems_allowed(); |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1602 | zonelist = node_zonelist(slab_node(current->mempolicy), flags); |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 1603 | for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1604 | struct kmem_cache_node *n; |
| 1605 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 1606 | n = get_node(s, zone_to_nid(zone)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1607 | |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 1608 | if (n && cpuset_zone_allowed_hardwall(zone, flags) && |
David Rientjes | 3b89d7d | 2009-02-22 17:40:07 -0800 | [diff] [blame] | 1609 | n->nr_partial > s->min_partial) { |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 1610 | page = get_partial_node(s, n); |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1611 | if (page) { |
| 1612 | put_mems_allowed(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1613 | return page; |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1614 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1615 | } |
| 1616 | } |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1617 | put_mems_allowed(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1618 | #endif |
| 1619 | return NULL; |
| 1620 | } |
| 1621 | |
| 1622 | /* |
| 1623 | * Get a partial page, lock it and return it. |
| 1624 | */ |
| 1625 | static struct page *get_partial(struct kmem_cache *s, gfp_t flags, int node) |
| 1626 | { |
| 1627 | struct page *page; |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 1628 | int searchnode = (node == NUMA_NO_NODE) ? numa_node_id() : node; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1629 | |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 1630 | page = get_partial_node(s, get_node(s, searchnode)); |
Christoph Lameter | 33de04e | 2011-04-15 14:48:12 -0500 | [diff] [blame] | 1631 | if (page || node != NUMA_NO_NODE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1632 | return page; |
| 1633 | |
| 1634 | return get_any_partial(s, flags); |
| 1635 | } |
| 1636 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1637 | #ifdef CONFIG_PREEMPT |
| 1638 | /* |
| 1639 | * Calculate the next globally unique transaction for disambiguiation |
| 1640 | * during cmpxchg. The transactions start with the cpu number and are then |
| 1641 | * incremented by CONFIG_NR_CPUS. |
| 1642 | */ |
| 1643 | #define TID_STEP roundup_pow_of_two(CONFIG_NR_CPUS) |
| 1644 | #else |
| 1645 | /* |
| 1646 | * No preemption supported therefore also no need to check for |
| 1647 | * different cpus. |
| 1648 | */ |
| 1649 | #define TID_STEP 1 |
| 1650 | #endif |
| 1651 | |
| 1652 | static inline unsigned long next_tid(unsigned long tid) |
| 1653 | { |
| 1654 | return tid + TID_STEP; |
| 1655 | } |
| 1656 | |
| 1657 | static inline unsigned int tid_to_cpu(unsigned long tid) |
| 1658 | { |
| 1659 | return tid % TID_STEP; |
| 1660 | } |
| 1661 | |
| 1662 | static inline unsigned long tid_to_event(unsigned long tid) |
| 1663 | { |
| 1664 | return tid / TID_STEP; |
| 1665 | } |
| 1666 | |
| 1667 | static inline unsigned int init_tid(int cpu) |
| 1668 | { |
| 1669 | return cpu; |
| 1670 | } |
| 1671 | |
| 1672 | static inline void note_cmpxchg_failure(const char *n, |
| 1673 | const struct kmem_cache *s, unsigned long tid) |
| 1674 | { |
| 1675 | #ifdef SLUB_DEBUG_CMPXCHG |
| 1676 | unsigned long actual_tid = __this_cpu_read(s->cpu_slab->tid); |
| 1677 | |
| 1678 | printk(KERN_INFO "%s %s: cmpxchg redo ", n, s->name); |
| 1679 | |
| 1680 | #ifdef CONFIG_PREEMPT |
| 1681 | if (tid_to_cpu(tid) != tid_to_cpu(actual_tid)) |
| 1682 | printk("due to cpu change %d -> %d\n", |
| 1683 | tid_to_cpu(tid), tid_to_cpu(actual_tid)); |
| 1684 | else |
| 1685 | #endif |
| 1686 | if (tid_to_event(tid) != tid_to_event(actual_tid)) |
| 1687 | printk("due to cpu running other code. Event %ld->%ld\n", |
| 1688 | tid_to_event(tid), tid_to_event(actual_tid)); |
| 1689 | else |
| 1690 | printk("for unknown reason: actual=%lx was=%lx target=%lx\n", |
| 1691 | actual_tid, tid, next_tid(tid)); |
| 1692 | #endif |
Christoph Lameter | 4fdccdf | 2011-03-22 13:35:00 -0500 | [diff] [blame] | 1693 | stat(s, CMPXCHG_DOUBLE_CPU_FAIL); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1694 | } |
| 1695 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1696 | void init_kmem_cache_cpus(struct kmem_cache *s) |
| 1697 | { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1698 | int cpu; |
| 1699 | |
| 1700 | for_each_possible_cpu(cpu) |
| 1701 | per_cpu_ptr(s->cpu_slab, cpu)->tid = init_tid(cpu); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1702 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1703 | /* |
| 1704 | * Remove the cpu slab |
| 1705 | */ |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1706 | |
| 1707 | /* |
| 1708 | * Remove the cpu slab |
| 1709 | */ |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1710 | static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1711 | { |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1712 | enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE }; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1713 | struct page *page = c->page; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1714 | struct kmem_cache_node *n = get_node(s, page_to_nid(page)); |
| 1715 | int lock = 0; |
| 1716 | enum slab_modes l = M_NONE, m = M_NONE; |
| 1717 | void *freelist; |
| 1718 | void *nextfree; |
| 1719 | int tail = 0; |
| 1720 | struct page new; |
| 1721 | struct page old; |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 1722 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1723 | if (page->freelist) { |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 1724 | stat(s, DEACTIVATE_REMOTE_FREES); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1725 | tail = 1; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1726 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1727 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1728 | c->tid = next_tid(c->tid); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1729 | c->page = NULL; |
| 1730 | freelist = c->freelist; |
| 1731 | c->freelist = NULL; |
| 1732 | |
| 1733 | /* |
| 1734 | * Stage one: Free all available per cpu objects back |
| 1735 | * to the page freelist while it is still frozen. Leave the |
| 1736 | * last one. |
| 1737 | * |
| 1738 | * There is no need to take the list->lock because the page |
| 1739 | * is still frozen. |
| 1740 | */ |
| 1741 | while (freelist && (nextfree = get_freepointer(s, freelist))) { |
| 1742 | void *prior; |
| 1743 | unsigned long counters; |
| 1744 | |
| 1745 | do { |
| 1746 | prior = page->freelist; |
| 1747 | counters = page->counters; |
| 1748 | set_freepointer(s, freelist, prior); |
| 1749 | new.counters = counters; |
| 1750 | new.inuse--; |
| 1751 | VM_BUG_ON(!new.frozen); |
| 1752 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 1753 | } while (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1754 | prior, counters, |
| 1755 | freelist, new.counters, |
| 1756 | "drain percpu freelist")); |
| 1757 | |
| 1758 | freelist = nextfree; |
| 1759 | } |
| 1760 | |
| 1761 | /* |
| 1762 | * Stage two: Ensure that the page is unfrozen while the |
| 1763 | * list presence reflects the actual number of objects |
| 1764 | * during unfreeze. |
| 1765 | * |
| 1766 | * We setup the list membership and then perform a cmpxchg |
| 1767 | * with the count. If there is a mismatch then the page |
| 1768 | * is not unfrozen but the page is on the wrong list. |
| 1769 | * |
| 1770 | * Then we restart the process which may have to remove |
| 1771 | * the page from the list that we just put it on again |
| 1772 | * because the number of objects in the slab may have |
| 1773 | * changed. |
| 1774 | */ |
| 1775 | redo: |
| 1776 | |
| 1777 | old.freelist = page->freelist; |
| 1778 | old.counters = page->counters; |
| 1779 | VM_BUG_ON(!old.frozen); |
| 1780 | |
| 1781 | /* Determine target state of the slab */ |
| 1782 | new.counters = old.counters; |
| 1783 | if (freelist) { |
| 1784 | new.inuse--; |
| 1785 | set_freepointer(s, freelist, old.freelist); |
| 1786 | new.freelist = freelist; |
| 1787 | } else |
| 1788 | new.freelist = old.freelist; |
| 1789 | |
| 1790 | new.frozen = 0; |
| 1791 | |
| 1792 | if (!new.inuse && n->nr_partial < s->min_partial) |
| 1793 | m = M_FREE; |
| 1794 | else if (new.freelist) { |
| 1795 | m = M_PARTIAL; |
| 1796 | if (!lock) { |
| 1797 | lock = 1; |
| 1798 | /* |
| 1799 | * Taking the spinlock removes the possiblity |
| 1800 | * that acquire_slab() will see a slab page that |
| 1801 | * is frozen |
| 1802 | */ |
| 1803 | spin_lock(&n->list_lock); |
| 1804 | } |
| 1805 | } else { |
| 1806 | m = M_FULL; |
| 1807 | if (kmem_cache_debug(s) && !lock) { |
| 1808 | lock = 1; |
| 1809 | /* |
| 1810 | * This also ensures that the scanning of full |
| 1811 | * slabs from diagnostic functions will not see |
| 1812 | * any frozen slabs. |
| 1813 | */ |
| 1814 | spin_lock(&n->list_lock); |
| 1815 | } |
| 1816 | } |
| 1817 | |
| 1818 | if (l != m) { |
| 1819 | |
| 1820 | if (l == M_PARTIAL) |
| 1821 | |
| 1822 | remove_partial(n, page); |
| 1823 | |
| 1824 | else if (l == M_FULL) |
| 1825 | |
| 1826 | remove_full(s, page); |
| 1827 | |
| 1828 | if (m == M_PARTIAL) { |
| 1829 | |
| 1830 | add_partial(n, page, tail); |
| 1831 | stat(s, tail ? DEACTIVATE_TO_TAIL : DEACTIVATE_TO_HEAD); |
| 1832 | |
| 1833 | } else if (m == M_FULL) { |
| 1834 | |
| 1835 | stat(s, DEACTIVATE_FULL); |
| 1836 | add_full(s, n, page); |
| 1837 | |
| 1838 | } |
| 1839 | } |
| 1840 | |
| 1841 | l = m; |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 1842 | if (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1843 | old.freelist, old.counters, |
| 1844 | new.freelist, new.counters, |
| 1845 | "unfreezing slab")) |
| 1846 | goto redo; |
| 1847 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1848 | if (lock) |
| 1849 | spin_unlock(&n->list_lock); |
| 1850 | |
| 1851 | if (m == M_FREE) { |
| 1852 | stat(s, DEACTIVATE_EMPTY); |
| 1853 | discard_slab(s, page); |
| 1854 | stat(s, FREE_SLAB); |
| 1855 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1856 | } |
| 1857 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1858 | static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1859 | { |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 1860 | stat(s, CPUSLAB_FLUSH); |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1861 | deactivate_slab(s, c); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1862 | } |
| 1863 | |
| 1864 | /* |
| 1865 | * Flush cpu slab. |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 1866 | * |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1867 | * Called from IPI handler with interrupts disabled. |
| 1868 | */ |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 1869 | static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1870 | { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 1871 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1872 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1873 | if (likely(c && c->page)) |
| 1874 | flush_slab(s, c); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1875 | } |
| 1876 | |
| 1877 | static void flush_cpu_slab(void *d) |
| 1878 | { |
| 1879 | struct kmem_cache *s = d; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1880 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1881 | __flush_cpu_slab(s, smp_processor_id()); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1882 | } |
| 1883 | |
| 1884 | static void flush_all(struct kmem_cache *s) |
| 1885 | { |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 1886 | on_each_cpu(flush_cpu_slab, s, 1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1887 | } |
| 1888 | |
| 1889 | /* |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1890 | * Check if the objects in a per cpu structure fit numa |
| 1891 | * locality expectations. |
| 1892 | */ |
| 1893 | static inline int node_match(struct kmem_cache_cpu *c, int node) |
| 1894 | { |
| 1895 | #ifdef CONFIG_NUMA |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 1896 | if (node != NUMA_NO_NODE && c->node != node) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1897 | return 0; |
| 1898 | #endif |
| 1899 | return 1; |
| 1900 | } |
| 1901 | |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 1902 | static int count_free(struct page *page) |
| 1903 | { |
| 1904 | return page->objects - page->inuse; |
| 1905 | } |
| 1906 | |
| 1907 | static unsigned long count_partial(struct kmem_cache_node *n, |
| 1908 | int (*get_count)(struct page *)) |
| 1909 | { |
| 1910 | unsigned long flags; |
| 1911 | unsigned long x = 0; |
| 1912 | struct page *page; |
| 1913 | |
| 1914 | spin_lock_irqsave(&n->list_lock, flags); |
| 1915 | list_for_each_entry(page, &n->partial, lru) |
| 1916 | x += get_count(page); |
| 1917 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 1918 | return x; |
| 1919 | } |
| 1920 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1921 | static inline unsigned long node_nr_objs(struct kmem_cache_node *n) |
| 1922 | { |
| 1923 | #ifdef CONFIG_SLUB_DEBUG |
| 1924 | return atomic_long_read(&n->total_objects); |
| 1925 | #else |
| 1926 | return 0; |
| 1927 | #endif |
| 1928 | } |
| 1929 | |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 1930 | static noinline void |
| 1931 | slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid) |
| 1932 | { |
| 1933 | int node; |
| 1934 | |
| 1935 | printk(KERN_WARNING |
| 1936 | "SLUB: Unable to allocate memory on node %d (gfp=0x%x)\n", |
| 1937 | nid, gfpflags); |
| 1938 | printk(KERN_WARNING " cache: %s, object size: %d, buffer size: %d, " |
| 1939 | "default order: %d, min order: %d\n", s->name, s->objsize, |
| 1940 | s->size, oo_order(s->oo), oo_order(s->min)); |
| 1941 | |
David Rientjes | fa5ec8a | 2009-07-07 00:14:14 -0700 | [diff] [blame] | 1942 | if (oo_order(s->min) > get_order(s->objsize)) |
| 1943 | printk(KERN_WARNING " %s debugging increased min order, use " |
| 1944 | "slub_debug=O to disable.\n", s->name); |
| 1945 | |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 1946 | for_each_online_node(node) { |
| 1947 | struct kmem_cache_node *n = get_node(s, node); |
| 1948 | unsigned long nr_slabs; |
| 1949 | unsigned long nr_objs; |
| 1950 | unsigned long nr_free; |
| 1951 | |
| 1952 | if (!n) |
| 1953 | continue; |
| 1954 | |
Alexander Beregalov | 26c02cf | 2009-06-11 14:08:48 +0400 | [diff] [blame] | 1955 | nr_free = count_partial(n, count_free); |
| 1956 | nr_slabs = node_nr_slabs(n); |
| 1957 | nr_objs = node_nr_objs(n); |
Pekka Enberg | 781b2ba | 2009-06-10 18:50:32 +0300 | [diff] [blame] | 1958 | |
| 1959 | printk(KERN_WARNING |
| 1960 | " node %d: slabs: %ld, objs: %ld, free: %ld\n", |
| 1961 | node, nr_slabs, nr_objs, nr_free); |
| 1962 | } |
| 1963 | } |
| 1964 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 1965 | /* |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1966 | * Slow path. The lockless freelist is empty or we need to perform |
| 1967 | * debugging duties. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1968 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1969 | * Interrupts are disabled. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1970 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1971 | * Processing is still very fast if new objects have been freed to the |
| 1972 | * regular freelist. In that case we simply take over the regular freelist |
| 1973 | * as the lockless freelist and zap the regular freelist. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1974 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 1975 | * If that is not working then we fall back to the partial lists. We take the |
| 1976 | * first element of the freelist as the object to allocate now and move the |
| 1977 | * rest of the freelist to the lockless freelist. |
| 1978 | * |
| 1979 | * And if we were unable to get a new slab from the partial slab lists then |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 1980 | * we need to allocate a new slab. This is the slowest path since it involves |
| 1981 | * a call to the page allocator and the setup of a new slab. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1982 | */ |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 1983 | static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, |
| 1984 | unsigned long addr, struct kmem_cache_cpu *c) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1985 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 1986 | void **object; |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 1987 | struct page *page; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1988 | unsigned long flags; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 1989 | struct page new; |
| 1990 | unsigned long counters; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 1991 | |
| 1992 | local_irq_save(flags); |
| 1993 | #ifdef CONFIG_PREEMPT |
| 1994 | /* |
| 1995 | * We may have been preempted and rescheduled on a different |
| 1996 | * cpu before disabling interrupts. Need to reload cpu area |
| 1997 | * pointer. |
| 1998 | */ |
| 1999 | c = this_cpu_ptr(s->cpu_slab); |
| 2000 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2001 | |
Linus Torvalds | e72e9c2 | 2008-03-27 20:56:33 -0700 | [diff] [blame] | 2002 | /* We handle __GFP_ZERO in the caller */ |
| 2003 | gfpflags &= ~__GFP_ZERO; |
| 2004 | |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2005 | page = c->page; |
| 2006 | if (!page) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2007 | goto new_slab; |
| 2008 | |
Christoph Lameter | fc59c05 | 2011-06-01 12:25:56 -0500 | [diff] [blame] | 2009 | if (unlikely(!node_match(c, node))) { |
Christoph Lameter | e36a265 | 2011-06-01 12:25:57 -0500 | [diff] [blame] | 2010 | stat(s, ALLOC_NODE_MISMATCH); |
Christoph Lameter | fc59c05 | 2011-06-01 12:25:56 -0500 | [diff] [blame] | 2011 | deactivate_slab(s, c); |
| 2012 | goto new_slab; |
| 2013 | } |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2014 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2015 | stat(s, ALLOC_SLOWPATH); |
| 2016 | |
| 2017 | do { |
| 2018 | object = page->freelist; |
| 2019 | counters = page->counters; |
| 2020 | new.counters = counters; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2021 | VM_BUG_ON(!new.frozen); |
| 2022 | |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 2023 | /* |
| 2024 | * If there is no object left then we use this loop to |
| 2025 | * deactivate the slab which is simple since no objects |
| 2026 | * are left in the slab and therefore we do not need to |
| 2027 | * put the page back onto the partial list. |
| 2028 | * |
| 2029 | * If there are objects left then we retrieve them |
| 2030 | * and use them to refill the per cpu queue. |
| 2031 | */ |
| 2032 | |
| 2033 | new.inuse = page->objects; |
| 2034 | new.frozen = object != NULL; |
| 2035 | |
Christoph Lameter | 1d07171 | 2011-07-14 12:49:12 -0500 | [diff] [blame] | 2036 | } while (!__cmpxchg_double_slab(s, page, |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2037 | object, counters, |
| 2038 | NULL, new.counters, |
| 2039 | "__slab_alloc")); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2040 | |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 2041 | if (unlikely(!object)) { |
| 2042 | c->page = NULL; |
| 2043 | stat(s, DEACTIVATE_BYPASS); |
Christoph Lameter | fc59c05 | 2011-06-01 12:25:56 -0500 | [diff] [blame] | 2044 | goto new_slab; |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 2045 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2046 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2047 | stat(s, ALLOC_REFILL); |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2048 | |
Christoph Lameter | 4eade54 | 2011-06-01 12:25:59 -0500 | [diff] [blame] | 2049 | load_freelist: |
| 2050 | VM_BUG_ON(!page->frozen); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2051 | c->freelist = get_freepointer(s, object); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2052 | c->tid = next_tid(c->tid); |
| 2053 | local_irq_restore(flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2054 | return object; |
| 2055 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2056 | new_slab: |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2057 | page = get_partial(s, gfpflags, node); |
| 2058 | if (page) { |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2059 | stat(s, ALLOC_FROM_PARTIAL); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2060 | object = c->freelist; |
| 2061 | |
| 2062 | if (kmem_cache_debug(s)) |
| 2063 | goto debug; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2064 | goto load_freelist; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2065 | } |
| 2066 | |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2067 | page = new_slab(s, gfpflags, node); |
Christoph Lameter | b811c20 | 2007-10-16 23:25:51 -0700 | [diff] [blame] | 2068 | |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2069 | if (page) { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2070 | c = __this_cpu_ptr(s->cpu_slab); |
Christoph Lameter | 05aa345 | 2007-11-05 11:31:58 -0800 | [diff] [blame] | 2071 | if (c->page) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2072 | flush_slab(s, c); |
Christoph Lameter | 01ad8a7 | 2011-04-15 14:48:14 -0500 | [diff] [blame] | 2073 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2074 | /* |
| 2075 | * No other reference to the page yet so we can |
| 2076 | * muck around with it freely without cmpxchg |
| 2077 | */ |
| 2078 | object = page->freelist; |
| 2079 | page->freelist = NULL; |
| 2080 | page->inuse = page->objects; |
| 2081 | |
| 2082 | stat(s, ALLOC_SLAB); |
David Rientjes | bd07d87 | 2011-05-12 13:10:49 -0700 | [diff] [blame] | 2083 | c->node = page_to_nid(page); |
| 2084 | c->page = page; |
Christoph Lameter | 9e577e8 | 2011-07-22 09:35:14 -0500 | [diff] [blame^] | 2085 | |
| 2086 | if (kmem_cache_debug(s)) |
| 2087 | goto debug; |
Christoph Lameter | 4b6f075 | 2007-05-16 22:10:53 -0700 | [diff] [blame] | 2088 | goto load_freelist; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2089 | } |
Pekka Enberg | 95f8598 | 2009-06-11 16:18:09 +0300 | [diff] [blame] | 2090 | if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit()) |
| 2091 | slab_out_of_memory(s, gfpflags, node); |
Christoph Lameter | 2fd66c5 | 2011-03-22 13:32:53 -0500 | [diff] [blame] | 2092 | local_irq_restore(flags); |
Christoph Lameter | 71c7a06 | 2008-02-14 14:28:01 -0800 | [diff] [blame] | 2093 | return NULL; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2094 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2095 | debug: |
| 2096 | if (!object || !alloc_debug_processing(s, page, object, addr)) |
| 2097 | goto new_slab; |
| 2098 | |
| 2099 | c->freelist = get_freepointer(s, object); |
Christoph Lameter | 442b06b | 2011-05-17 16:29:31 -0500 | [diff] [blame] | 2100 | deactivate_slab(s, c); |
| 2101 | c->page = NULL; |
Pekka Enberg | 15b7c51 | 2010-10-02 11:32:32 +0300 | [diff] [blame] | 2102 | c->node = NUMA_NO_NODE; |
Christoph Lameter | a71ae47 | 2011-05-25 09:47:43 -0500 | [diff] [blame] | 2103 | local_irq_restore(flags); |
| 2104 | return object; |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2105 | } |
| 2106 | |
| 2107 | /* |
| 2108 | * Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc) |
| 2109 | * have the fastpath folded into their functions. So no function call |
| 2110 | * overhead for requests that can be satisfied on the fastpath. |
| 2111 | * |
| 2112 | * The fastpath works by first checking if the lockless freelist can be used. |
| 2113 | * If not then __slab_alloc is called for slow processing. |
| 2114 | * |
| 2115 | * Otherwise we can simply pick the next object from the lockless free list. |
| 2116 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2117 | static __always_inline void *slab_alloc(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2118 | gfp_t gfpflags, int node, unsigned long addr) |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2119 | { |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2120 | void **object; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2121 | struct kmem_cache_cpu *c; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2122 | unsigned long tid; |
Christoph Lameter | 1f84260 | 2008-01-07 23:20:30 -0800 | [diff] [blame] | 2123 | |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2124 | if (slab_pre_alloc_hook(s, gfpflags)) |
Akinobu Mita | 773ff60 | 2008-12-23 19:37:01 +0900 | [diff] [blame] | 2125 | return NULL; |
| 2126 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2127 | redo: |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2128 | |
| 2129 | /* |
| 2130 | * Must read kmem_cache cpu data via this cpu ptr. Preemption is |
| 2131 | * enabled. We may switch back and forth between cpus while |
| 2132 | * reading from one cpu area. That does not matter as long |
| 2133 | * as we end up on the original cpu again when doing the cmpxchg. |
| 2134 | */ |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2135 | c = __this_cpu_ptr(s->cpu_slab); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2136 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2137 | /* |
| 2138 | * The transaction ids are globally unique per cpu and per operation on |
| 2139 | * a per cpu queue. Thus they can be guarantee that the cmpxchg_double |
| 2140 | * occurs on the right processor and that there was no operation on the |
| 2141 | * linked list in between. |
| 2142 | */ |
| 2143 | tid = c->tid; |
| 2144 | barrier(); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2145 | |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2146 | object = c->freelist; |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2147 | if (unlikely(!object || !node_match(c, node))) |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2148 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2149 | object = __slab_alloc(s, gfpflags, node, addr, c); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2150 | |
| 2151 | else { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2152 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2153 | * The cmpxchg will only match if there was no additional |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2154 | * operation and if we are on the right processor. |
| 2155 | * |
| 2156 | * The cmpxchg does the following atomically (without lock semantics!) |
| 2157 | * 1. Relocate first pointer to the current per cpu area. |
| 2158 | * 2. Verify that tid and freelist have not been changed |
| 2159 | * 3. If they were not changed replace tid and freelist |
| 2160 | * |
| 2161 | * Since this is without lock semantics the protection is only against |
| 2162 | * code executing on this cpu *not* from access by other cpus. |
| 2163 | */ |
Thomas Gleixner | 30106b8 | 2011-05-04 15:38:19 +0200 | [diff] [blame] | 2164 | if (unlikely(!irqsafe_cpu_cmpxchg_double( |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2165 | s->cpu_slab->freelist, s->cpu_slab->tid, |
| 2166 | object, tid, |
Christoph Lameter | 1393d9a | 2011-05-16 15:26:08 -0500 | [diff] [blame] | 2167 | get_freepointer_safe(s, object), next_tid(tid)))) { |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2168 | |
| 2169 | note_cmpxchg_failure("slab_alloc", s, tid); |
| 2170 | goto redo; |
| 2171 | } |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2172 | stat(s, ALLOC_FASTPATH); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2173 | } |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2174 | |
Pekka Enberg | 74e2134 | 2009-11-25 20:14:48 +0200 | [diff] [blame] | 2175 | if (unlikely(gfpflags & __GFP_ZERO) && object) |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2176 | memset(object, 0, s->objsize); |
Christoph Lameter | d07dbea | 2007-07-17 04:03:23 -0700 | [diff] [blame] | 2177 | |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2178 | slab_post_alloc_hook(s, gfpflags, object); |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 2179 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2180 | return object; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2181 | } |
| 2182 | |
| 2183 | void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) |
| 2184 | { |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 2185 | void *ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2186 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 2187 | trace_kmem_cache_alloc(_RET_IP_, ret, s->objsize, s->size, gfpflags); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2188 | |
| 2189 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2190 | } |
| 2191 | EXPORT_SYMBOL(kmem_cache_alloc); |
| 2192 | |
Li Zefan | 0f24f12 | 2009-12-11 15:45:30 +0800 | [diff] [blame] | 2193 | #ifdef CONFIG_TRACING |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2194 | void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size) |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2195 | { |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2196 | void *ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, _RET_IP_); |
| 2197 | trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags); |
| 2198 | return ret; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2199 | } |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2200 | EXPORT_SYMBOL(kmem_cache_alloc_trace); |
| 2201 | |
| 2202 | void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) |
| 2203 | { |
| 2204 | void *ret = kmalloc_order(size, flags, order); |
| 2205 | trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << order, flags); |
| 2206 | return ret; |
| 2207 | } |
| 2208 | EXPORT_SYMBOL(kmalloc_order_trace); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2209 | #endif |
| 2210 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2211 | #ifdef CONFIG_NUMA |
| 2212 | void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) |
| 2213 | { |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2214 | void *ret = slab_alloc(s, gfpflags, node, _RET_IP_); |
| 2215 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 2216 | trace_kmem_cache_alloc_node(_RET_IP_, ret, |
| 2217 | s->objsize, s->size, gfpflags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2218 | |
| 2219 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2220 | } |
| 2221 | EXPORT_SYMBOL(kmem_cache_alloc_node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2222 | |
Li Zefan | 0f24f12 | 2009-12-11 15:45:30 +0800 | [diff] [blame] | 2223 | #ifdef CONFIG_TRACING |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2224 | void *kmem_cache_alloc_node_trace(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2225 | gfp_t gfpflags, |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2226 | int node, size_t size) |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2227 | { |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2228 | void *ret = slab_alloc(s, gfpflags, node, _RET_IP_); |
| 2229 | |
| 2230 | trace_kmalloc_node(_RET_IP_, ret, |
| 2231 | size, s->size, gfpflags, node); |
| 2232 | return ret; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2233 | } |
Richard Kennedy | 4a92379 | 2010-10-21 10:29:19 +0100 | [diff] [blame] | 2234 | EXPORT_SYMBOL(kmem_cache_alloc_node_trace); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2235 | #endif |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 2236 | #endif |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2237 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2238 | /* |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2239 | * Slow patch handling. This may still be called frequently since objects |
| 2240 | * have a longer lifetime than the cpu slabs in most processing loads. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2241 | * |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2242 | * So we still attempt to reduce cache line usage. Just take the slab |
| 2243 | * lock and free the item. If there is no additional partial page |
| 2244 | * handling required then we can return immediately. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2245 | */ |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2246 | static void __slab_free(struct kmem_cache *s, struct page *page, |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2247 | void *x, unsigned long addr) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2248 | { |
| 2249 | void *prior; |
| 2250 | void **object = (void *)x; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2251 | int was_frozen; |
| 2252 | int inuse; |
| 2253 | struct page new; |
| 2254 | unsigned long counters; |
| 2255 | struct kmem_cache_node *n = NULL; |
Christoph Lameter | 61728d1 | 2011-06-01 12:25:51 -0500 | [diff] [blame] | 2256 | unsigned long uninitialized_var(flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2257 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2258 | stat(s, FREE_SLOWPATH); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2259 | |
Christoph Lameter | 8dc16c6 | 2011-04-15 14:48:16 -0500 | [diff] [blame] | 2260 | if (kmem_cache_debug(s) && !free_debug_processing(s, page, x, addr)) |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2261 | return; |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2262 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2263 | do { |
| 2264 | prior = page->freelist; |
| 2265 | counters = page->counters; |
| 2266 | set_freepointer(s, object, prior); |
| 2267 | new.counters = counters; |
| 2268 | was_frozen = new.frozen; |
| 2269 | new.inuse--; |
| 2270 | if ((!new.inuse || !prior) && !was_frozen && !n) { |
| 2271 | n = get_node(s, page_to_nid(page)); |
| 2272 | /* |
| 2273 | * Speculatively acquire the list_lock. |
| 2274 | * If the cmpxchg does not succeed then we may |
| 2275 | * drop the list_lock without any processing. |
| 2276 | * |
| 2277 | * Otherwise the list_lock will synchronize with |
| 2278 | * other processors updating the list of slabs. |
| 2279 | */ |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2280 | spin_lock_irqsave(&n->list_lock, flags); |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2281 | } |
| 2282 | inuse = new.inuse; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2283 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2284 | } while (!cmpxchg_double_slab(s, page, |
| 2285 | prior, counters, |
| 2286 | object, new.counters, |
| 2287 | "__slab_free")); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2288 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2289 | if (likely(!n)) { |
| 2290 | /* |
| 2291 | * The list lock was not taken therefore no list |
| 2292 | * activity can be necessary. |
| 2293 | */ |
| 2294 | if (was_frozen) |
| 2295 | stat(s, FREE_FROZEN); |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2296 | return; |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2297 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2298 | |
| 2299 | /* |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2300 | * was_frozen may have been set after we acquired the list_lock in |
| 2301 | * an earlier loop. So we need to check it here again. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2302 | */ |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2303 | if (was_frozen) |
| 2304 | stat(s, FREE_FROZEN); |
| 2305 | else { |
| 2306 | if (unlikely(!inuse && n->nr_partial > s->min_partial)) |
| 2307 | goto slab_empty; |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 2308 | |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2309 | /* |
| 2310 | * Objects left in the slab. If it was not on the partial list before |
| 2311 | * then add it. |
| 2312 | */ |
| 2313 | if (unlikely(!prior)) { |
| 2314 | remove_full(s, page); |
| 2315 | add_partial(n, page, 0); |
| 2316 | stat(s, FREE_ADD_PARTIAL); |
| 2317 | } |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 2318 | } |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2319 | spin_unlock_irqrestore(&n->list_lock, flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2320 | return; |
| 2321 | |
| 2322 | slab_empty: |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 2323 | if (prior) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2324 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2325 | * Slab still on the partial list. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2326 | */ |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 2327 | remove_partial(n, page); |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2328 | stat(s, FREE_REMOVE_PARTIAL); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 2329 | } |
Christoph Lameter | 2cfb745 | 2011-06-01 12:25:52 -0500 | [diff] [blame] | 2330 | |
Christoph Lameter | 80f08c1 | 2011-06-01 12:25:55 -0500 | [diff] [blame] | 2331 | spin_unlock_irqrestore(&n->list_lock, flags); |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2332 | stat(s, FREE_SLAB); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2333 | discard_slab(s, page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2334 | } |
| 2335 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2336 | /* |
| 2337 | * Fastpath with forced inlining to produce a kfree and kmem_cache_free that |
| 2338 | * can perform fastpath freeing without additional function calls. |
| 2339 | * |
| 2340 | * The fastpath is only possible if we are freeing to the current cpu slab |
| 2341 | * of this processor. This typically the case if we have just allocated |
| 2342 | * the item before. |
| 2343 | * |
| 2344 | * If fastpath is not possible then fall back to __slab_free where we deal |
| 2345 | * with all sorts of special processing. |
| 2346 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2347 | static __always_inline void slab_free(struct kmem_cache *s, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2348 | struct page *page, void *x, unsigned long addr) |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2349 | { |
| 2350 | void **object = (void *)x; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2351 | struct kmem_cache_cpu *c; |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2352 | unsigned long tid; |
Christoph Lameter | 1f84260 | 2008-01-07 23:20:30 -0800 | [diff] [blame] | 2353 | |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2354 | slab_free_hook(s, x); |
| 2355 | |
Christoph Lameter | a24c5a0 | 2011-03-15 12:45:21 -0500 | [diff] [blame] | 2356 | redo: |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2357 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2358 | /* |
| 2359 | * Determine the currently cpus per cpu slab. |
| 2360 | * The cpu may change afterward. However that does not matter since |
| 2361 | * data is retrieved via this pointer. If we are on the same cpu |
| 2362 | * during the cmpxchg then the free will succedd. |
| 2363 | */ |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2364 | c = __this_cpu_ptr(s->cpu_slab); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2365 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2366 | tid = c->tid; |
| 2367 | barrier(); |
Christoph Lameter | c016b0b | 2010-08-20 12:37:16 -0500 | [diff] [blame] | 2368 | |
Christoph Lameter | 442b06b | 2011-05-17 16:29:31 -0500 | [diff] [blame] | 2369 | if (likely(page == c->page)) { |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2370 | set_freepointer(s, object, c->freelist); |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2371 | |
Thomas Gleixner | 30106b8 | 2011-05-04 15:38:19 +0200 | [diff] [blame] | 2372 | if (unlikely(!irqsafe_cpu_cmpxchg_double( |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2373 | s->cpu_slab->freelist, s->cpu_slab->tid, |
| 2374 | c->freelist, tid, |
| 2375 | object, next_tid(tid)))) { |
| 2376 | |
| 2377 | note_cmpxchg_failure("slab_free", s, tid); |
| 2378 | goto redo; |
| 2379 | } |
Christoph Lameter | 84e554e | 2009-12-18 16:26:23 -0600 | [diff] [blame] | 2380 | stat(s, FREE_FASTPATH); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2381 | } else |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2382 | __slab_free(s, page, x, addr); |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2383 | |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 2384 | } |
| 2385 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2386 | void kmem_cache_free(struct kmem_cache *s, void *x) |
| 2387 | { |
Christoph Lameter | 77c5e2d | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 2388 | struct page *page; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2389 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 2390 | page = virt_to_head_page(x); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2391 | |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 2392 | slab_free(s, page, x, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 2393 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 2394 | trace_kmem_cache_free(_RET_IP_, x); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2395 | } |
| 2396 | EXPORT_SYMBOL(kmem_cache_free); |
| 2397 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2398 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2399 | * Object placement in a slab is made very easy because we always start at |
| 2400 | * offset 0. If we tune the size of the object to the alignment then we can |
| 2401 | * get the required alignment by putting one properly sized object after |
| 2402 | * another. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2403 | * |
| 2404 | * Notice that the allocation order determines the sizes of the per cpu |
| 2405 | * caches. Each processor has always one slab available for allocations. |
| 2406 | * Increasing the allocation order reduces the number of times that slabs |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2407 | * must be moved on and off the partial lists and is therefore a factor in |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2408 | * locking overhead. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2409 | */ |
| 2410 | |
| 2411 | /* |
| 2412 | * Mininum / Maximum order of slab pages. This influences locking overhead |
| 2413 | * and slab fragmentation. A higher order reduces the number of partial slabs |
| 2414 | * and increases the number of allocations possible without having to |
| 2415 | * take the list_lock. |
| 2416 | */ |
| 2417 | static int slub_min_order; |
Christoph Lameter | 114e9e8 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2418 | static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER; |
Christoph Lameter | 9b2cd50 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2419 | static int slub_min_objects; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2420 | |
| 2421 | /* |
| 2422 | * Merge control. If this is set then no merging of slab caches will occur. |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2423 | * (Could be removed. This was introduced to pacify the merge skeptics.) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2424 | */ |
| 2425 | static int slub_nomerge; |
| 2426 | |
| 2427 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2428 | * Calculate the order of allocation given an slab object size. |
| 2429 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2430 | * The order of allocation has significant impact on performance and other |
| 2431 | * system components. Generally order 0 allocations should be preferred since |
| 2432 | * order 0 does not cause fragmentation in the page allocator. Larger objects |
| 2433 | * be problematic to put into order 0 slabs because there may be too much |
Christoph Lameter | c124f5b | 2008-04-14 19:13:29 +0300 | [diff] [blame] | 2434 | * unused space left. We go to a higher order if more than 1/16th of the slab |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2435 | * would be wasted. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2436 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2437 | * In order to reach satisfactory performance we must ensure that a minimum |
| 2438 | * number of objects is in one slab. Otherwise we may generate too much |
| 2439 | * activity on the partial lists which requires taking the list_lock. This is |
| 2440 | * less a concern for large slabs though which are rarely used. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2441 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2442 | * slub_max_order specifies the order where we begin to stop considering the |
| 2443 | * number of objects in a slab as critical. If we reach slub_max_order then |
| 2444 | * we try to keep the page order as low as possible. So we accept more waste |
| 2445 | * of space in favor of a small page order. |
| 2446 | * |
| 2447 | * Higher order allocations also allow the placement of more objects in a |
| 2448 | * slab and thereby reduce object handling overhead. If the user has |
| 2449 | * requested a higher mininum order then we start with that one instead of |
| 2450 | * the smallest order which will fit the object. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2451 | */ |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2452 | static inline int slab_order(int size, int min_objects, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2453 | int max_order, int fract_leftover, int reserved) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2454 | { |
| 2455 | int order; |
| 2456 | int rem; |
Christoph Lameter | 6300ea7 | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 2457 | int min_order = slub_min_order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2458 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2459 | if (order_objects(min_order, size, reserved) > MAX_OBJS_PER_PAGE) |
Cyrill Gorcunov | 210b5c0 | 2008-10-22 23:00:38 +0400 | [diff] [blame] | 2460 | return get_order(size * MAX_OBJS_PER_PAGE) - 1; |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 2461 | |
Christoph Lameter | 6300ea7 | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 2462 | for (order = max(min_order, |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2463 | fls(min_objects * size - 1) - PAGE_SHIFT); |
| 2464 | order <= max_order; order++) { |
| 2465 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2466 | unsigned long slab_size = PAGE_SIZE << order; |
| 2467 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2468 | if (slab_size < min_objects * size + reserved) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2469 | continue; |
| 2470 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2471 | rem = (slab_size - reserved) % size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2472 | |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2473 | if (rem <= slab_size / fract_leftover) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2474 | break; |
| 2475 | |
| 2476 | } |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2477 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2478 | return order; |
| 2479 | } |
| 2480 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2481 | static inline int calculate_order(int size, int reserved) |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2482 | { |
| 2483 | int order; |
| 2484 | int min_objects; |
| 2485 | int fraction; |
Zhang Yanmin | e8120ff | 2009-02-12 18:00:17 +0200 | [diff] [blame] | 2486 | int max_objects; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2487 | |
| 2488 | /* |
| 2489 | * Attempt to find best configuration for a slab. This |
| 2490 | * works by first attempting to generate a layout with |
| 2491 | * the best configuration and backing off gradually. |
| 2492 | * |
| 2493 | * First we reduce the acceptable waste in a slab. Then |
| 2494 | * we reduce the minimum objects required in a slab. |
| 2495 | */ |
| 2496 | min_objects = slub_min_objects; |
Christoph Lameter | 9b2cd50 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2497 | if (!min_objects) |
| 2498 | min_objects = 4 * (fls(nr_cpu_ids) + 1); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2499 | max_objects = order_objects(slub_max_order, size, reserved); |
Zhang Yanmin | e8120ff | 2009-02-12 18:00:17 +0200 | [diff] [blame] | 2500 | min_objects = min(min_objects, max_objects); |
| 2501 | |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2502 | while (min_objects > 1) { |
Christoph Lameter | c124f5b | 2008-04-14 19:13:29 +0300 | [diff] [blame] | 2503 | fraction = 16; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2504 | while (fraction >= 4) { |
| 2505 | order = slab_order(size, min_objects, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2506 | slub_max_order, fraction, reserved); |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2507 | if (order <= slub_max_order) |
| 2508 | return order; |
| 2509 | fraction /= 2; |
| 2510 | } |
Amerigo Wang | 5086c38 | 2009-08-19 21:44:13 +0300 | [diff] [blame] | 2511 | min_objects--; |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2512 | } |
| 2513 | |
| 2514 | /* |
| 2515 | * We were unable to place multiple objects in a slab. Now |
| 2516 | * lets see if we can place a single object there. |
| 2517 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2518 | order = slab_order(size, 1, slub_max_order, 1, reserved); |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2519 | if (order <= slub_max_order) |
| 2520 | return order; |
| 2521 | |
| 2522 | /* |
| 2523 | * Doh this slab cannot be placed using slub_max_order. |
| 2524 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2525 | order = slab_order(size, 1, MAX_ORDER, 1, reserved); |
David Rientjes | 818cf59 | 2009-04-23 09:58:22 +0300 | [diff] [blame] | 2526 | if (order < MAX_ORDER) |
Christoph Lameter | 5e6d444 | 2007-05-09 02:32:46 -0700 | [diff] [blame] | 2527 | return order; |
| 2528 | return -ENOSYS; |
| 2529 | } |
| 2530 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2531 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2532 | * Figure out what the alignment of the objects will be. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2533 | */ |
| 2534 | static unsigned long calculate_alignment(unsigned long flags, |
| 2535 | unsigned long align, unsigned long size) |
| 2536 | { |
| 2537 | /* |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2538 | * If the user wants hardware cache aligned objects then follow that |
| 2539 | * suggestion if the object is sufficiently large. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2540 | * |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2541 | * The hardware cache alignment cannot override the specified |
| 2542 | * alignment though. If that is greater then use it. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2543 | */ |
Nick Piggin | b621038 | 2008-03-05 14:05:56 -0800 | [diff] [blame] | 2544 | if (flags & SLAB_HWCACHE_ALIGN) { |
| 2545 | unsigned long ralign = cache_line_size(); |
| 2546 | while (size <= ralign / 2) |
| 2547 | ralign /= 2; |
| 2548 | align = max(align, ralign); |
| 2549 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2550 | |
| 2551 | if (align < ARCH_SLAB_MINALIGN) |
Nick Piggin | b621038 | 2008-03-05 14:05:56 -0800 | [diff] [blame] | 2552 | align = ARCH_SLAB_MINALIGN; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2553 | |
| 2554 | return ALIGN(align, sizeof(void *)); |
| 2555 | } |
| 2556 | |
Pekka Enberg | 5595cff | 2008-08-05 09:28:47 +0300 | [diff] [blame] | 2557 | static void |
| 2558 | init_kmem_cache_node(struct kmem_cache_node *n, struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2559 | { |
| 2560 | n->nr_partial = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2561 | spin_lock_init(&n->list_lock); |
| 2562 | INIT_LIST_HEAD(&n->partial); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2563 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 2564 | atomic_long_set(&n->nr_slabs, 0); |
Salman Qazi | 02b71b7 | 2008-09-11 12:25:41 -0700 | [diff] [blame] | 2565 | atomic_long_set(&n->total_objects, 0); |
Christoph Lameter | 643b113 | 2007-05-06 14:49:42 -0700 | [diff] [blame] | 2566 | INIT_LIST_HEAD(&n->full); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2567 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2568 | } |
| 2569 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2570 | static inline int alloc_kmem_cache_cpus(struct kmem_cache *s) |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2571 | { |
Christoph Lameter | 6c182dc | 2010-08-20 12:37:14 -0500 | [diff] [blame] | 2572 | BUILD_BUG_ON(PERCPU_DYNAMIC_EARLY_SIZE < |
| 2573 | SLUB_PAGE_SHIFT * sizeof(struct kmem_cache_cpu)); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2574 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2575 | /* |
Chris Metcalf | d4d84fe | 2011-06-02 10:19:41 -0400 | [diff] [blame] | 2576 | * Must align to double word boundary for the double cmpxchg |
| 2577 | * instructions to work; see __pcpu_double_call_return_bool(). |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2578 | */ |
Chris Metcalf | d4d84fe | 2011-06-02 10:19:41 -0400 | [diff] [blame] | 2579 | s->cpu_slab = __alloc_percpu(sizeof(struct kmem_cache_cpu), |
| 2580 | 2 * sizeof(void *)); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2581 | |
Christoph Lameter | 8a5ec0b | 2011-02-25 11:38:54 -0600 | [diff] [blame] | 2582 | if (!s->cpu_slab) |
| 2583 | return 0; |
| 2584 | |
| 2585 | init_kmem_cache_cpus(s); |
| 2586 | |
| 2587 | return 1; |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2588 | } |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2589 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2590 | static struct kmem_cache *kmem_cache_node; |
| 2591 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2592 | /* |
| 2593 | * No kmalloc_node yet so do it by hand. We know that this is the first |
| 2594 | * slab on the node for this slabcache. There are no concurrent accesses |
| 2595 | * possible. |
| 2596 | * |
| 2597 | * Note that this function only works on the kmalloc_node_cache |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2598 | * when allocating for the kmalloc_node_cache. This is used for bootstrapping |
| 2599 | * memory on a fresh node that has no slab structures yet. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2600 | */ |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2601 | static void early_kmem_cache_node_alloc(int node) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2602 | { |
| 2603 | struct page *page; |
| 2604 | struct kmem_cache_node *n; |
| 2605 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2606 | BUG_ON(kmem_cache_node->size < sizeof(struct kmem_cache_node)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2607 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2608 | page = new_slab(kmem_cache_node, GFP_NOWAIT, node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2609 | |
| 2610 | BUG_ON(!page); |
Christoph Lameter | a2f92ee | 2007-08-22 14:01:57 -0700 | [diff] [blame] | 2611 | if (page_to_nid(page) != node) { |
| 2612 | printk(KERN_ERR "SLUB: Unable to allocate memory from " |
| 2613 | "node %d\n", node); |
| 2614 | printk(KERN_ERR "SLUB: Allocating a useless per node structure " |
| 2615 | "in order to be able to continue\n"); |
| 2616 | } |
| 2617 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2618 | n = page->freelist; |
| 2619 | BUG_ON(!n); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2620 | page->freelist = get_freepointer(kmem_cache_node, n); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2621 | page->inuse++; |
Christoph Lameter | 8cb0a50 | 2011-06-01 12:25:46 -0500 | [diff] [blame] | 2622 | page->frozen = 0; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2623 | kmem_cache_node->node[node] = n; |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2624 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | f7cb193 | 2010-09-29 07:15:01 -0500 | [diff] [blame] | 2625 | init_object(kmem_cache_node, n, SLUB_RED_ACTIVE); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2626 | init_tracking(kmem_cache_node, n); |
Christoph Lameter | 8ab1372 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 2627 | #endif |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2628 | init_kmem_cache_node(n, kmem_cache_node); |
| 2629 | inc_slabs_node(kmem_cache_node, node, page->objects); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 2630 | |
Christoph Lameter | 7c2e132 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2631 | add_partial(n, page, 0); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2632 | } |
| 2633 | |
| 2634 | static void free_kmem_cache_nodes(struct kmem_cache *s) |
| 2635 | { |
| 2636 | int node; |
| 2637 | |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 2638 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2639 | struct kmem_cache_node *n = s->node[node]; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2640 | |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2641 | if (n) |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2642 | kmem_cache_free(kmem_cache_node, n); |
| 2643 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2644 | s->node[node] = NULL; |
| 2645 | } |
| 2646 | } |
| 2647 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2648 | static int init_kmem_cache_nodes(struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2649 | { |
| 2650 | int node; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2651 | |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 2652 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2653 | struct kmem_cache_node *n; |
| 2654 | |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2655 | if (slab_state == DOWN) { |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2656 | early_kmem_cache_node_alloc(node); |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2657 | continue; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2658 | } |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2659 | n = kmem_cache_alloc_node(kmem_cache_node, |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2660 | GFP_KERNEL, node); |
Alexander Duyck | 73367bd | 2010-05-21 14:41:35 -0700 | [diff] [blame] | 2661 | |
| 2662 | if (!n) { |
| 2663 | free_kmem_cache_nodes(s); |
| 2664 | return 0; |
| 2665 | } |
| 2666 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2667 | s->node[node] = n; |
Pekka Enberg | 5595cff | 2008-08-05 09:28:47 +0300 | [diff] [blame] | 2668 | init_kmem_cache_node(n, s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2669 | } |
| 2670 | return 1; |
| 2671 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2672 | |
David Rientjes | c0bdb23 | 2009-02-25 09:16:35 +0200 | [diff] [blame] | 2673 | static void set_min_partial(struct kmem_cache *s, unsigned long min) |
David Rientjes | 3b89d7d | 2009-02-22 17:40:07 -0800 | [diff] [blame] | 2674 | { |
| 2675 | if (min < MIN_PARTIAL) |
| 2676 | min = MIN_PARTIAL; |
| 2677 | else if (min > MAX_PARTIAL) |
| 2678 | min = MAX_PARTIAL; |
| 2679 | s->min_partial = min; |
| 2680 | } |
| 2681 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2682 | /* |
| 2683 | * calculate_sizes() determines the order and the distribution of data within |
| 2684 | * a slab object. |
| 2685 | */ |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2686 | static int calculate_sizes(struct kmem_cache *s, int forced_order) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2687 | { |
| 2688 | unsigned long flags = s->flags; |
| 2689 | unsigned long size = s->objsize; |
| 2690 | unsigned long align = s->align; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2691 | int order; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2692 | |
| 2693 | /* |
Christoph Lameter | d8b42bf | 2008-02-15 23:45:25 -0800 | [diff] [blame] | 2694 | * Round up object size to the next word boundary. We can only |
| 2695 | * place the free pointer at word boundaries and this determines |
| 2696 | * the possible location of the free pointer. |
| 2697 | */ |
| 2698 | size = ALIGN(size, sizeof(void *)); |
| 2699 | |
| 2700 | #ifdef CONFIG_SLUB_DEBUG |
| 2701 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2702 | * Determine if we can poison the object itself. If the user of |
| 2703 | * the slab may touch the object after free or before allocation |
| 2704 | * then we should never poison the object itself. |
| 2705 | */ |
| 2706 | if ((flags & SLAB_POISON) && !(flags & SLAB_DESTROY_BY_RCU) && |
Christoph Lameter | c59def9f | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 2707 | !s->ctor) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2708 | s->flags |= __OBJECT_POISON; |
| 2709 | else |
| 2710 | s->flags &= ~__OBJECT_POISON; |
| 2711 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2712 | |
| 2713 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2714 | * If we are Redzoning then check if there is some space between the |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2715 | * end of the object and the free pointer. If not then add an |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2716 | * additional word to have some bytes to store Redzone information. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2717 | */ |
| 2718 | if ((flags & SLAB_RED_ZONE) && size == s->objsize) |
| 2719 | size += sizeof(void *); |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 2720 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2721 | |
| 2722 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2723 | * With that we have determined the number of bytes in actual use |
| 2724 | * by the object. This is the potential offset to the free pointer. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2725 | */ |
| 2726 | s->inuse = size; |
| 2727 | |
| 2728 | if (((flags & (SLAB_DESTROY_BY_RCU | SLAB_POISON)) || |
Christoph Lameter | c59def9f | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 2729 | s->ctor)) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2730 | /* |
| 2731 | * Relocate free pointer after the object if it is not |
| 2732 | * permitted to overwrite the first word of the object on |
| 2733 | * kmem_cache_free. |
| 2734 | * |
| 2735 | * This is the case if we do RCU, have a constructor or |
| 2736 | * destructor or are poisoning the objects. |
| 2737 | */ |
| 2738 | s->offset = size; |
| 2739 | size += sizeof(void *); |
| 2740 | } |
| 2741 | |
Christoph Lameter | c12b3c6 | 2007-05-23 13:57:31 -0700 | [diff] [blame] | 2742 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2743 | if (flags & SLAB_STORE_USER) |
| 2744 | /* |
| 2745 | * Need to store information about allocs and frees after |
| 2746 | * the object. |
| 2747 | */ |
| 2748 | size += 2 * sizeof(struct track); |
| 2749 | |
Christoph Lameter | be7b3fb | 2007-05-09 02:32:36 -0700 | [diff] [blame] | 2750 | if (flags & SLAB_RED_ZONE) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2751 | /* |
| 2752 | * Add some empty padding so that we can catch |
| 2753 | * overwrites from earlier objects rather than let |
| 2754 | * tracking information or the free pointer be |
Frederik Schwarzer | 0211a9c | 2008-12-29 22:14:56 +0100 | [diff] [blame] | 2755 | * corrupted if a user writes before the start |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2756 | * of the object. |
| 2757 | */ |
| 2758 | size += sizeof(void *); |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 2759 | #endif |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2760 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2761 | /* |
| 2762 | * Determine the alignment based on various parameters that the |
Christoph Lameter | 65c02d4 | 2007-05-09 02:32:35 -0700 | [diff] [blame] | 2763 | * user specified and the dynamic determination of cache line size |
| 2764 | * on bootup. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2765 | */ |
| 2766 | align = calculate_alignment(flags, align, s->objsize); |
Zhang, Yanmin | dcb0ce1 | 2009-07-30 11:28:11 +0800 | [diff] [blame] | 2767 | s->align = align; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2768 | |
| 2769 | /* |
| 2770 | * SLUB stores one object immediately after another beginning from |
| 2771 | * offset 0. In order to align the objects we have to simply size |
| 2772 | * each object to conform to the alignment. |
| 2773 | */ |
| 2774 | size = ALIGN(size, align); |
| 2775 | s->size = size; |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2776 | if (forced_order >= 0) |
| 2777 | order = forced_order; |
| 2778 | else |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2779 | order = calculate_order(size, s->reserved); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2780 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2781 | if (order < 0) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2782 | return 0; |
| 2783 | |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 2784 | s->allocflags = 0; |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2785 | if (order) |
Christoph Lameter | b7a49f0 | 2008-02-14 14:21:32 -0800 | [diff] [blame] | 2786 | s->allocflags |= __GFP_COMP; |
| 2787 | |
| 2788 | if (s->flags & SLAB_CACHE_DMA) |
| 2789 | s->allocflags |= SLUB_DMA; |
| 2790 | |
| 2791 | if (s->flags & SLAB_RECLAIM_ACCOUNT) |
| 2792 | s->allocflags |= __GFP_RECLAIMABLE; |
| 2793 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2794 | /* |
| 2795 | * Determine the number of objects per slab |
| 2796 | */ |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2797 | s->oo = oo_make(order, size, s->reserved); |
| 2798 | s->min = oo_make(get_order(size), size, s->reserved); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 2799 | if (oo_objects(s->oo) > oo_objects(s->max)) |
| 2800 | s->max = s->oo; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2801 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2802 | return !!oo_objects(s->oo); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2803 | |
| 2804 | } |
| 2805 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2806 | static int kmem_cache_open(struct kmem_cache *s, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2807 | const char *name, size_t size, |
| 2808 | size_t align, unsigned long flags, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 2809 | void (*ctor)(void *)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2810 | { |
| 2811 | memset(s, 0, kmem_size); |
| 2812 | s->name = name; |
| 2813 | s->ctor = ctor; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2814 | s->objsize = size; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2815 | s->align = align; |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 2816 | s->flags = kmem_cache_flags(size, flags, name, ctor); |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 2817 | s->reserved = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2818 | |
Lai Jiangshan | da9a638 | 2011-03-10 15:22:00 +0800 | [diff] [blame] | 2819 | if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU)) |
| 2820 | s->reserved = sizeof(struct rcu_head); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2821 | |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 2822 | if (!calculate_sizes(s, -1)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2823 | goto error; |
David Rientjes | 3de4721 | 2009-07-27 18:30:35 -0700 | [diff] [blame] | 2824 | if (disable_higher_order_debug) { |
| 2825 | /* |
| 2826 | * Disable debugging flags that store metadata if the min slab |
| 2827 | * order increased. |
| 2828 | */ |
| 2829 | if (get_order(s->size) > get_order(s->objsize)) { |
| 2830 | s->flags &= ~DEBUG_METADATA_FLAGS; |
| 2831 | s->offset = 0; |
| 2832 | if (!calculate_sizes(s, -1)) |
| 2833 | goto error; |
| 2834 | } |
| 2835 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2836 | |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 2837 | #ifdef CONFIG_CMPXCHG_DOUBLE |
| 2838 | if (system_has_cmpxchg_double() && (s->flags & SLAB_DEBUG_FLAGS) == 0) |
| 2839 | /* Enable fast mode */ |
| 2840 | s->flags |= __CMPXCHG_DOUBLE; |
| 2841 | #endif |
| 2842 | |
David Rientjes | 3b89d7d | 2009-02-22 17:40:07 -0800 | [diff] [blame] | 2843 | /* |
| 2844 | * The larger the object size is, the more pages we want on the partial |
| 2845 | * list to avoid pounding the page allocator excessively. |
| 2846 | */ |
David Rientjes | c0bdb23 | 2009-02-25 09:16:35 +0200 | [diff] [blame] | 2847 | set_min_partial(s, ilog2(s->size)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2848 | s->refcount = 1; |
| 2849 | #ifdef CONFIG_NUMA |
Christoph Lameter | e2cb96b | 2008-08-19 08:51:22 -0500 | [diff] [blame] | 2850 | s->remote_node_defrag_ratio = 1000; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2851 | #endif |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2852 | if (!init_kmem_cache_nodes(s)) |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 2853 | goto error; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2854 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2855 | if (alloc_kmem_cache_cpus(s)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2856 | return 1; |
Christoph Lameter | ff12059 | 2009-12-18 16:26:22 -0600 | [diff] [blame] | 2857 | |
Christoph Lameter | 4c93c355 | 2007-10-16 01:26:08 -0700 | [diff] [blame] | 2858 | free_kmem_cache_nodes(s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2859 | error: |
| 2860 | if (flags & SLAB_PANIC) |
| 2861 | panic("Cannot create slab %s size=%lu realsize=%u " |
| 2862 | "order=%u offset=%u flags=%lx\n", |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 2863 | s->name, (unsigned long)size, s->size, oo_order(s->oo), |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2864 | s->offset, flags); |
| 2865 | return 0; |
| 2866 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2867 | |
| 2868 | /* |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2869 | * Determine the size of a slab object |
| 2870 | */ |
| 2871 | unsigned int kmem_cache_size(struct kmem_cache *s) |
| 2872 | { |
| 2873 | return s->objsize; |
| 2874 | } |
| 2875 | EXPORT_SYMBOL(kmem_cache_size); |
| 2876 | |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2877 | static void list_slab_objects(struct kmem_cache *s, struct page *page, |
| 2878 | const char *text) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2879 | { |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2880 | #ifdef CONFIG_SLUB_DEBUG |
| 2881 | void *addr = page_address(page); |
| 2882 | void *p; |
Namhyung Kim | a5dd5c1 | 2010-09-29 21:02:13 +0900 | [diff] [blame] | 2883 | unsigned long *map = kzalloc(BITS_TO_LONGS(page->objects) * |
| 2884 | sizeof(long), GFP_ATOMIC); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 2885 | if (!map) |
| 2886 | return; |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2887 | slab_err(s, page, "%s", text); |
| 2888 | slab_lock(page); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2889 | |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 2890 | get_map(s, page, map); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2891 | for_each_object(p, s, addr, page->objects) { |
| 2892 | |
| 2893 | if (!test_bit(slab_index(p, s, addr), map)) { |
| 2894 | printk(KERN_ERR "INFO: Object 0x%p @offset=%tu\n", |
| 2895 | p, p - addr); |
| 2896 | print_tracking(s, p); |
| 2897 | } |
| 2898 | } |
| 2899 | slab_unlock(page); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 2900 | kfree(map); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2901 | #endif |
| 2902 | } |
| 2903 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2904 | /* |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 2905 | * Attempt to free all partial slabs on a node. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2906 | */ |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 2907 | static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2908 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2909 | unsigned long flags; |
| 2910 | struct page *page, *h; |
| 2911 | |
| 2912 | spin_lock_irqsave(&n->list_lock, flags); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2913 | list_for_each_entry_safe(page, h, &n->partial, lru) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2914 | if (!page->inuse) { |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 2915 | remove_partial(n, page); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2916 | discard_slab(s, page); |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2917 | } else { |
| 2918 | list_slab_objects(s, page, |
| 2919 | "Objects remaining on kmem_cache_close()"); |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 2920 | } |
Christoph Lameter | 33b12c3 | 2008-04-25 12:22:43 -0700 | [diff] [blame] | 2921 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2922 | spin_unlock_irqrestore(&n->list_lock, flags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2923 | } |
| 2924 | |
| 2925 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 2926 | * Release all resources used by a slab cache. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2927 | */ |
Christoph Lameter | 0c71001 | 2007-07-17 04:03:24 -0700 | [diff] [blame] | 2928 | static inline int kmem_cache_close(struct kmem_cache *s) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2929 | { |
| 2930 | int node; |
| 2931 | |
| 2932 | flush_all(s); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 2933 | free_percpu(s->cpu_slab); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2934 | /* Attempt to free all objects */ |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 2935 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2936 | struct kmem_cache_node *n = get_node(s, node); |
| 2937 | |
Christoph Lameter | 599870b | 2008-04-23 12:36:52 -0700 | [diff] [blame] | 2938 | free_partial(s, n); |
| 2939 | if (n->nr_partial || slabs_node(s, node)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2940 | return 1; |
| 2941 | } |
| 2942 | free_kmem_cache_nodes(s); |
| 2943 | return 0; |
| 2944 | } |
| 2945 | |
| 2946 | /* |
| 2947 | * Close a cache and release the kmem_cache structure |
| 2948 | * (must be used for caches created using kmem_cache_create) |
| 2949 | */ |
| 2950 | void kmem_cache_destroy(struct kmem_cache *s) |
| 2951 | { |
| 2952 | down_write(&slub_lock); |
| 2953 | s->refcount--; |
| 2954 | if (!s->refcount) { |
| 2955 | list_del(&s->list); |
Pekka Enberg | d629d81 | 2008-04-23 22:31:08 +0300 | [diff] [blame] | 2956 | if (kmem_cache_close(s)) { |
| 2957 | printk(KERN_ERR "SLUB %s: %s called for cache that " |
| 2958 | "still has objects.\n", s->name, __func__); |
| 2959 | dump_stack(); |
| 2960 | } |
Eric Dumazet | d76b159 | 2009-09-03 22:38:59 +0300 | [diff] [blame] | 2961 | if (s->flags & SLAB_DESTROY_BY_RCU) |
| 2962 | rcu_barrier(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2963 | sysfs_slab_remove(s); |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 2964 | } |
| 2965 | up_write(&slub_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2966 | } |
| 2967 | EXPORT_SYMBOL(kmem_cache_destroy); |
| 2968 | |
| 2969 | /******************************************************************** |
| 2970 | * Kmalloc subsystem |
| 2971 | *******************************************************************/ |
| 2972 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2973 | struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT]; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2974 | EXPORT_SYMBOL(kmalloc_caches); |
| 2975 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2976 | static struct kmem_cache *kmem_cache; |
| 2977 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2978 | #ifdef CONFIG_ZONE_DMA |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 2979 | static struct kmem_cache *kmalloc_dma_caches[SLUB_PAGE_SHIFT]; |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 2980 | #endif |
| 2981 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2982 | static int __init setup_slub_min_order(char *str) |
| 2983 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2984 | get_option(&str, &slub_min_order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2985 | |
| 2986 | return 1; |
| 2987 | } |
| 2988 | |
| 2989 | __setup("slub_min_order=", setup_slub_min_order); |
| 2990 | |
| 2991 | static int __init setup_slub_max_order(char *str) |
| 2992 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 2993 | get_option(&str, &slub_max_order); |
David Rientjes | 818cf59 | 2009-04-23 09:58:22 +0300 | [diff] [blame] | 2994 | slub_max_order = min(slub_max_order, MAX_ORDER - 1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 2995 | |
| 2996 | return 1; |
| 2997 | } |
| 2998 | |
| 2999 | __setup("slub_max_order=", setup_slub_max_order); |
| 3000 | |
| 3001 | static int __init setup_slub_min_objects(char *str) |
| 3002 | { |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3003 | get_option(&str, &slub_min_objects); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3004 | |
| 3005 | return 1; |
| 3006 | } |
| 3007 | |
| 3008 | __setup("slub_min_objects=", setup_slub_min_objects); |
| 3009 | |
| 3010 | static int __init setup_slub_nomerge(char *str) |
| 3011 | { |
| 3012 | slub_nomerge = 1; |
| 3013 | return 1; |
| 3014 | } |
| 3015 | |
| 3016 | __setup("slub_nomerge", setup_slub_nomerge); |
| 3017 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3018 | static struct kmem_cache *__init create_kmalloc_cache(const char *name, |
| 3019 | int size, unsigned int flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3020 | { |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3021 | struct kmem_cache *s; |
| 3022 | |
| 3023 | s = kmem_cache_alloc(kmem_cache, GFP_NOWAIT); |
| 3024 | |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 3025 | /* |
| 3026 | * This function is called with IRQs disabled during early-boot on |
| 3027 | * single CPU so there's no need to take slub_lock here. |
| 3028 | */ |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3029 | if (!kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN, |
Christoph Lameter | 319d1e2 | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 3030 | flags, NULL)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3031 | goto panic; |
| 3032 | |
| 3033 | list_add(&s->list, &slab_caches); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3034 | return s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3035 | |
| 3036 | panic: |
| 3037 | panic("Creation of kmalloc slab %s size=%d failed.\n", name, size); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3038 | return NULL; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3039 | } |
| 3040 | |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3041 | /* |
| 3042 | * Conversion table for small slabs sizes / 8 to the index in the |
| 3043 | * kmalloc array. This is necessary for slabs < 192 since we have non power |
| 3044 | * of two cache sizes there. The size of larger slabs can be determined using |
| 3045 | * fls. |
| 3046 | */ |
| 3047 | static s8 size_index[24] = { |
| 3048 | 3, /* 8 */ |
| 3049 | 4, /* 16 */ |
| 3050 | 5, /* 24 */ |
| 3051 | 5, /* 32 */ |
| 3052 | 6, /* 40 */ |
| 3053 | 6, /* 48 */ |
| 3054 | 6, /* 56 */ |
| 3055 | 6, /* 64 */ |
| 3056 | 1, /* 72 */ |
| 3057 | 1, /* 80 */ |
| 3058 | 1, /* 88 */ |
| 3059 | 1, /* 96 */ |
| 3060 | 7, /* 104 */ |
| 3061 | 7, /* 112 */ |
| 3062 | 7, /* 120 */ |
| 3063 | 7, /* 128 */ |
| 3064 | 2, /* 136 */ |
| 3065 | 2, /* 144 */ |
| 3066 | 2, /* 152 */ |
| 3067 | 2, /* 160 */ |
| 3068 | 2, /* 168 */ |
| 3069 | 2, /* 176 */ |
| 3070 | 2, /* 184 */ |
| 3071 | 2 /* 192 */ |
| 3072 | }; |
| 3073 | |
Aaro Koskinen | acdfcd0 | 2009-08-28 14:28:54 +0300 | [diff] [blame] | 3074 | static inline int size_index_elem(size_t bytes) |
| 3075 | { |
| 3076 | return (bytes - 1) / 8; |
| 3077 | } |
| 3078 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3079 | static struct kmem_cache *get_slab(size_t size, gfp_t flags) |
| 3080 | { |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3081 | int index; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3082 | |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3083 | if (size <= 192) { |
| 3084 | if (!size) |
| 3085 | return ZERO_SIZE_PTR; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3086 | |
Aaro Koskinen | acdfcd0 | 2009-08-28 14:28:54 +0300 | [diff] [blame] | 3087 | index = size_index[size_index_elem(size)]; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3088 | } else |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3089 | index = fls(size - 1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3090 | |
| 3091 | #ifdef CONFIG_ZONE_DMA |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3092 | if (unlikely((flags & SLUB_DMA))) |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3093 | return kmalloc_dma_caches[index]; |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3094 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3095 | #endif |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3096 | return kmalloc_caches[index]; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3097 | } |
| 3098 | |
| 3099 | void *__kmalloc(size_t size, gfp_t flags) |
| 3100 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3101 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3102 | void *ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3103 | |
Christoph Lameter | ffadd4d | 2009-02-17 12:05:07 -0500 | [diff] [blame] | 3104 | if (unlikely(size > SLUB_MAX_SIZE)) |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 3105 | return kmalloc_large(size, flags); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3106 | |
| 3107 | s = get_slab(size, flags); |
| 3108 | |
| 3109 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3110 | return s; |
| 3111 | |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 3112 | ret = slab_alloc(s, flags, NUMA_NO_NODE, _RET_IP_); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3113 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3114 | trace_kmalloc(_RET_IP_, ret, size, s->size, flags); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3115 | |
| 3116 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3117 | } |
| 3118 | EXPORT_SYMBOL(__kmalloc); |
| 3119 | |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 3120 | #ifdef CONFIG_NUMA |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3121 | static void *kmalloc_large_node(size_t size, gfp_t flags, int node) |
| 3122 | { |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 3123 | struct page *page; |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3124 | void *ptr = NULL; |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3125 | |
Vegard Nossum | b1eeab6 | 2008-11-25 16:55:53 +0100 | [diff] [blame] | 3126 | flags |= __GFP_COMP | __GFP_NOTRACK; |
| 3127 | page = alloc_pages_node(node, flags, get_order(size)); |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3128 | if (page) |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3129 | ptr = page_address(page); |
| 3130 | |
| 3131 | kmemleak_alloc(ptr, size, 1, flags); |
| 3132 | return ptr; |
Christoph Lameter | f619cfe | 2008-03-01 13:56:40 -0800 | [diff] [blame] | 3133 | } |
| 3134 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3135 | void *__kmalloc_node(size_t size, gfp_t flags, int node) |
| 3136 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3137 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3138 | void *ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3139 | |
Ingo Molnar | 057685c | 2009-02-20 12:15:30 +0100 | [diff] [blame] | 3140 | if (unlikely(size > SLUB_MAX_SIZE)) { |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3141 | ret = kmalloc_large_node(size, flags, node); |
| 3142 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3143 | trace_kmalloc_node(_RET_IP_, ret, |
| 3144 | size, PAGE_SIZE << get_order(size), |
| 3145 | flags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3146 | |
| 3147 | return ret; |
| 3148 | } |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3149 | |
| 3150 | s = get_slab(size, flags); |
| 3151 | |
| 3152 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3153 | return s; |
| 3154 | |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3155 | ret = slab_alloc(s, flags, node, _RET_IP_); |
| 3156 | |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3157 | trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node); |
Eduard - Gabriel Munteanu | 5b882be | 2008-08-19 20:43:26 +0300 | [diff] [blame] | 3158 | |
| 3159 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3160 | } |
| 3161 | EXPORT_SYMBOL(__kmalloc_node); |
| 3162 | #endif |
| 3163 | |
| 3164 | size_t ksize(const void *object) |
| 3165 | { |
Christoph Lameter | 272c1d2 | 2007-06-08 13:46:49 -0700 | [diff] [blame] | 3166 | struct page *page; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3167 | |
Christoph Lameter | ef8b452 | 2007-10-16 01:24:46 -0700 | [diff] [blame] | 3168 | if (unlikely(object == ZERO_SIZE_PTR)) |
Christoph Lameter | 272c1d2 | 2007-06-08 13:46:49 -0700 | [diff] [blame] | 3169 | return 0; |
| 3170 | |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3171 | page = virt_to_head_page(object); |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3172 | |
Pekka Enberg | 7699441 | 2008-05-22 19:22:25 +0300 | [diff] [blame] | 3173 | if (unlikely(!PageSlab(page))) { |
| 3174 | WARN_ON(!PageCompound(page)); |
Vegard Nossum | 294a80a | 2007-12-04 23:45:30 -0800 | [diff] [blame] | 3175 | return PAGE_SIZE << compound_order(page); |
Pekka Enberg | 7699441 | 2008-05-22 19:22:25 +0300 | [diff] [blame] | 3176 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3177 | |
Eric Dumazet | b3d4188 | 2011-02-14 18:35:22 +0100 | [diff] [blame] | 3178 | return slab_ksize(page->slab); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3179 | } |
Kirill A. Shutemov | b1aabec | 2009-02-10 15:21:44 +0200 | [diff] [blame] | 3180 | EXPORT_SYMBOL(ksize); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3181 | |
| 3182 | void kfree(const void *x) |
| 3183 | { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3184 | struct page *page; |
Christoph Lameter | 5bb983b | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 3185 | void *object = (void *)x; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3186 | |
Pekka Enberg | 2121db7 | 2009-03-25 11:05:57 +0200 | [diff] [blame] | 3187 | trace_kfree(_RET_IP_, x); |
| 3188 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 3189 | if (unlikely(ZERO_OR_NULL_PTR(x))) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3190 | return; |
| 3191 | |
Christoph Lameter | b49af68 | 2007-05-06 14:49:41 -0700 | [diff] [blame] | 3192 | page = virt_to_head_page(x); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3193 | if (unlikely(!PageSlab(page))) { |
Christoph Lameter | 0937502 | 2008-05-28 10:32:22 -0700 | [diff] [blame] | 3194 | BUG_ON(!PageCompound(page)); |
Catalin Marinas | e4f7c0b4 | 2009-07-07 10:32:59 +0100 | [diff] [blame] | 3195 | kmemleak_free(x); |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3196 | put_page(page); |
| 3197 | return; |
| 3198 | } |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3199 | slab_free(page->slab, page, object, _RET_IP_); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3200 | } |
| 3201 | EXPORT_SYMBOL(kfree); |
| 3202 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3203 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3204 | * kmem_cache_shrink removes empty slabs from the partial lists and sorts |
| 3205 | * the remaining slabs by the number of items in use. The slabs with the |
| 3206 | * most items in use come first. New allocations will then fill those up |
| 3207 | * and thus they can be removed from the partial lists. |
| 3208 | * |
| 3209 | * The slabs with the least items are placed last. This results in them |
| 3210 | * being allocated from last increasing the chance that the last objects |
| 3211 | * are freed in them. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3212 | */ |
| 3213 | int kmem_cache_shrink(struct kmem_cache *s) |
| 3214 | { |
| 3215 | int node; |
| 3216 | int i; |
| 3217 | struct kmem_cache_node *n; |
| 3218 | struct page *page; |
| 3219 | struct page *t; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3220 | int objects = oo_objects(s->max); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3221 | struct list_head *slabs_by_inuse = |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3222 | kmalloc(sizeof(struct list_head) * objects, GFP_KERNEL); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3223 | unsigned long flags; |
| 3224 | |
| 3225 | if (!slabs_by_inuse) |
| 3226 | return -ENOMEM; |
| 3227 | |
| 3228 | flush_all(s); |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 3229 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3230 | n = get_node(s, node); |
| 3231 | |
| 3232 | if (!n->nr_partial) |
| 3233 | continue; |
| 3234 | |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3235 | for (i = 0; i < objects; i++) |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3236 | INIT_LIST_HEAD(slabs_by_inuse + i); |
| 3237 | |
| 3238 | spin_lock_irqsave(&n->list_lock, flags); |
| 3239 | |
| 3240 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3241 | * Build lists indexed by the items in use in each slab. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3242 | * |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3243 | * Note that concurrent frees may occur while we hold the |
| 3244 | * list_lock. page->inuse here is the upper limit. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3245 | */ |
| 3246 | list_for_each_entry_safe(page, t, &n->partial, lru) { |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 3247 | if (!page->inuse) { |
Christoph Lameter | 5cc6eee | 2011-06-01 12:25:50 -0500 | [diff] [blame] | 3248 | remove_partial(n, page); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3249 | discard_slab(s, page); |
| 3250 | } else { |
Christoph Lameter | fcda3d8 | 2007-07-30 13:06:46 -0700 | [diff] [blame] | 3251 | list_move(&page->lru, |
| 3252 | slabs_by_inuse + page->inuse); |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3253 | } |
| 3254 | } |
| 3255 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3256 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3257 | * Rebuild the partial list with the slabs filled up most |
| 3258 | * first and the least used slabs at the end. |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3259 | */ |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3260 | for (i = objects - 1; i >= 0; i--) |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3261 | list_splice(slabs_by_inuse + i, n->partial.prev); |
| 3262 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 3263 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 3264 | } |
| 3265 | |
| 3266 | kfree(slabs_by_inuse); |
| 3267 | return 0; |
| 3268 | } |
| 3269 | EXPORT_SYMBOL(kmem_cache_shrink); |
| 3270 | |
Pekka Enberg | 92a5bbc | 2010-10-06 16:58:16 +0300 | [diff] [blame] | 3271 | #if defined(CONFIG_MEMORY_HOTPLUG) |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3272 | static int slab_mem_going_offline_callback(void *arg) |
| 3273 | { |
| 3274 | struct kmem_cache *s; |
| 3275 | |
| 3276 | down_read(&slub_lock); |
| 3277 | list_for_each_entry(s, &slab_caches, list) |
| 3278 | kmem_cache_shrink(s); |
| 3279 | up_read(&slub_lock); |
| 3280 | |
| 3281 | return 0; |
| 3282 | } |
| 3283 | |
| 3284 | static void slab_mem_offline_callback(void *arg) |
| 3285 | { |
| 3286 | struct kmem_cache_node *n; |
| 3287 | struct kmem_cache *s; |
| 3288 | struct memory_notify *marg = arg; |
| 3289 | int offline_node; |
| 3290 | |
| 3291 | offline_node = marg->status_change_nid; |
| 3292 | |
| 3293 | /* |
| 3294 | * If the node still has available memory. we need kmem_cache_node |
| 3295 | * for it yet. |
| 3296 | */ |
| 3297 | if (offline_node < 0) |
| 3298 | return; |
| 3299 | |
| 3300 | down_read(&slub_lock); |
| 3301 | list_for_each_entry(s, &slab_caches, list) { |
| 3302 | n = get_node(s, offline_node); |
| 3303 | if (n) { |
| 3304 | /* |
| 3305 | * if n->nr_slabs > 0, slabs still exist on the node |
| 3306 | * that is going down. We were unable to free them, |
Adam Buchbinder | c9404c9 | 2009-12-18 15:40:42 -0500 | [diff] [blame] | 3307 | * and offline_pages() function shouldn't call this |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3308 | * callback. So, we must fail. |
| 3309 | */ |
Christoph Lameter | 0f389ec | 2008-04-14 18:53:02 +0300 | [diff] [blame] | 3310 | BUG_ON(slabs_node(s, offline_node)); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3311 | |
| 3312 | s->node[offline_node] = NULL; |
Christoph Lameter | 8de66a0 | 2010-08-25 14:51:14 -0500 | [diff] [blame] | 3313 | kmem_cache_free(kmem_cache_node, n); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3314 | } |
| 3315 | } |
| 3316 | up_read(&slub_lock); |
| 3317 | } |
| 3318 | |
| 3319 | static int slab_mem_going_online_callback(void *arg) |
| 3320 | { |
| 3321 | struct kmem_cache_node *n; |
| 3322 | struct kmem_cache *s; |
| 3323 | struct memory_notify *marg = arg; |
| 3324 | int nid = marg->status_change_nid; |
| 3325 | int ret = 0; |
| 3326 | |
| 3327 | /* |
| 3328 | * If the node's memory is already available, then kmem_cache_node is |
| 3329 | * already created. Nothing to do. |
| 3330 | */ |
| 3331 | if (nid < 0) |
| 3332 | return 0; |
| 3333 | |
| 3334 | /* |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 3335 | * We are bringing a node online. No memory is available yet. We must |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3336 | * allocate a kmem_cache_node structure in order to bring the node |
| 3337 | * online. |
| 3338 | */ |
| 3339 | down_read(&slub_lock); |
| 3340 | list_for_each_entry(s, &slab_caches, list) { |
| 3341 | /* |
| 3342 | * XXX: kmem_cache_alloc_node will fallback to other nodes |
| 3343 | * since memory is not yet available from the node that |
| 3344 | * is brought up. |
| 3345 | */ |
Christoph Lameter | 8de66a0 | 2010-08-25 14:51:14 -0500 | [diff] [blame] | 3346 | n = kmem_cache_alloc(kmem_cache_node, GFP_KERNEL); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3347 | if (!n) { |
| 3348 | ret = -ENOMEM; |
| 3349 | goto out; |
| 3350 | } |
Pekka Enberg | 5595cff | 2008-08-05 09:28:47 +0300 | [diff] [blame] | 3351 | init_kmem_cache_node(n, s); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3352 | s->node[nid] = n; |
| 3353 | } |
| 3354 | out: |
| 3355 | up_read(&slub_lock); |
| 3356 | return ret; |
| 3357 | } |
| 3358 | |
| 3359 | static int slab_memory_callback(struct notifier_block *self, |
| 3360 | unsigned long action, void *arg) |
| 3361 | { |
| 3362 | int ret = 0; |
| 3363 | |
| 3364 | switch (action) { |
| 3365 | case MEM_GOING_ONLINE: |
| 3366 | ret = slab_mem_going_online_callback(arg); |
| 3367 | break; |
| 3368 | case MEM_GOING_OFFLINE: |
| 3369 | ret = slab_mem_going_offline_callback(arg); |
| 3370 | break; |
| 3371 | case MEM_OFFLINE: |
| 3372 | case MEM_CANCEL_ONLINE: |
| 3373 | slab_mem_offline_callback(arg); |
| 3374 | break; |
| 3375 | case MEM_ONLINE: |
| 3376 | case MEM_CANCEL_OFFLINE: |
| 3377 | break; |
| 3378 | } |
KAMEZAWA Hiroyuki | dc19f9d | 2008-12-01 13:13:48 -0800 | [diff] [blame] | 3379 | if (ret) |
| 3380 | ret = notifier_from_errno(ret); |
| 3381 | else |
| 3382 | ret = NOTIFY_OK; |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3383 | return ret; |
| 3384 | } |
| 3385 | |
| 3386 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 3387 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3388 | /******************************************************************** |
| 3389 | * Basic setup of slabs |
| 3390 | *******************************************************************/ |
| 3391 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3392 | /* |
| 3393 | * Used for early kmem_cache structures that were allocated using |
| 3394 | * the page allocator |
| 3395 | */ |
| 3396 | |
| 3397 | static void __init kmem_cache_bootstrap_fixup(struct kmem_cache *s) |
| 3398 | { |
| 3399 | int node; |
| 3400 | |
| 3401 | list_add(&s->list, &slab_caches); |
| 3402 | s->refcount = -1; |
| 3403 | |
| 3404 | for_each_node_state(node, N_NORMAL_MEMORY) { |
| 3405 | struct kmem_cache_node *n = get_node(s, node); |
| 3406 | struct page *p; |
| 3407 | |
| 3408 | if (n) { |
| 3409 | list_for_each_entry(p, &n->partial, lru) |
| 3410 | p->slab = s; |
| 3411 | |
Li Zefan | 607bf32 | 2011-04-12 15:22:26 +0800 | [diff] [blame] | 3412 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3413 | list_for_each_entry(p, &n->full, lru) |
| 3414 | p->slab = s; |
| 3415 | #endif |
| 3416 | } |
| 3417 | } |
| 3418 | } |
| 3419 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3420 | void __init kmem_cache_init(void) |
| 3421 | { |
| 3422 | int i; |
Christoph Lameter | 4b356be | 2007-06-16 10:16:13 -0700 | [diff] [blame] | 3423 | int caches = 0; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3424 | struct kmem_cache *temp_kmem_cache; |
| 3425 | int order; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3426 | struct kmem_cache *temp_kmem_cache_node; |
| 3427 | unsigned long kmalloc_size; |
| 3428 | |
| 3429 | kmem_size = offsetof(struct kmem_cache, node) + |
| 3430 | nr_node_ids * sizeof(struct kmem_cache_node *); |
| 3431 | |
| 3432 | /* Allocate two kmem_caches from the page allocator */ |
| 3433 | kmalloc_size = ALIGN(kmem_size, cache_line_size()); |
| 3434 | order = get_order(2 * kmalloc_size); |
| 3435 | kmem_cache = (void *)__get_free_pages(GFP_NOWAIT, order); |
| 3436 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3437 | /* |
| 3438 | * Must first have the slab cache available for the allocations of the |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3439 | * struct kmem_cache_node's. There is special bootstrap code in |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3440 | * kmem_cache_open for slab_state == DOWN. |
| 3441 | */ |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3442 | kmem_cache_node = (void *)kmem_cache + kmalloc_size; |
| 3443 | |
| 3444 | kmem_cache_open(kmem_cache_node, "kmem_cache_node", |
| 3445 | sizeof(struct kmem_cache_node), |
| 3446 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL); |
Yasunori Goto | b9049e2 | 2007-10-21 16:41:37 -0700 | [diff] [blame] | 3447 | |
Nadia Derbey | 0c40ba4 | 2008-04-29 01:00:41 -0700 | [diff] [blame] | 3448 | hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3449 | |
| 3450 | /* Able to allocate the per node structures */ |
| 3451 | slab_state = PARTIAL; |
| 3452 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3453 | temp_kmem_cache = kmem_cache; |
| 3454 | kmem_cache_open(kmem_cache, "kmem_cache", kmem_size, |
| 3455 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL); |
| 3456 | kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT); |
| 3457 | memcpy(kmem_cache, temp_kmem_cache, kmem_size); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3458 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3459 | /* |
| 3460 | * Allocate kmem_cache_node properly from the kmem_cache slab. |
| 3461 | * kmem_cache_node is separately allocated so no need to |
| 3462 | * update any list pointers. |
| 3463 | */ |
| 3464 | temp_kmem_cache_node = kmem_cache_node; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3465 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3466 | kmem_cache_node = kmem_cache_alloc(kmem_cache, GFP_NOWAIT); |
| 3467 | memcpy(kmem_cache_node, temp_kmem_cache_node, kmem_size); |
| 3468 | |
| 3469 | kmem_cache_bootstrap_fixup(kmem_cache_node); |
| 3470 | |
| 3471 | caches++; |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3472 | kmem_cache_bootstrap_fixup(kmem_cache); |
| 3473 | caches++; |
| 3474 | /* Free temporary boot structure */ |
| 3475 | free_pages((unsigned long)temp_kmem_cache, order); |
| 3476 | |
| 3477 | /* Now we can use the kmem_cache to allocate kmalloc slabs */ |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3478 | |
| 3479 | /* |
| 3480 | * Patch up the size_index table if we have strange large alignment |
| 3481 | * requirements for the kmalloc array. This is only the case for |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 3482 | * MIPS it seems. The standard arches will not generate any code here. |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3483 | * |
| 3484 | * Largest permitted alignment is 256 bytes due to the way we |
| 3485 | * handle the index determination for the smaller caches. |
| 3486 | * |
| 3487 | * Make sure that nothing crazy happens if someone starts tinkering |
| 3488 | * around with ARCH_KMALLOC_MINALIGN |
| 3489 | */ |
| 3490 | BUILD_BUG_ON(KMALLOC_MIN_SIZE > 256 || |
| 3491 | (KMALLOC_MIN_SIZE & (KMALLOC_MIN_SIZE - 1))); |
| 3492 | |
Aaro Koskinen | acdfcd0 | 2009-08-28 14:28:54 +0300 | [diff] [blame] | 3493 | for (i = 8; i < KMALLOC_MIN_SIZE; i += 8) { |
| 3494 | int elem = size_index_elem(i); |
| 3495 | if (elem >= ARRAY_SIZE(size_index)) |
| 3496 | break; |
| 3497 | size_index[elem] = KMALLOC_SHIFT_LOW; |
| 3498 | } |
Christoph Lameter | f1b2633 | 2007-07-17 04:03:26 -0700 | [diff] [blame] | 3499 | |
Aaro Koskinen | acdfcd0 | 2009-08-28 14:28:54 +0300 | [diff] [blame] | 3500 | if (KMALLOC_MIN_SIZE == 64) { |
| 3501 | /* |
| 3502 | * The 96 byte size cache is not used if the alignment |
| 3503 | * is 64 byte. |
| 3504 | */ |
| 3505 | for (i = 64 + 8; i <= 96; i += 8) |
| 3506 | size_index[size_index_elem(i)] = 7; |
| 3507 | } else if (KMALLOC_MIN_SIZE == 128) { |
Christoph Lameter | 41d54d3 | 2008-07-03 09:14:26 -0500 | [diff] [blame] | 3508 | /* |
| 3509 | * The 192 byte sized cache is not used if the alignment |
| 3510 | * is 128 byte. Redirect kmalloc to use the 256 byte cache |
| 3511 | * instead. |
| 3512 | */ |
| 3513 | for (i = 128 + 8; i <= 192; i += 8) |
Aaro Koskinen | acdfcd0 | 2009-08-28 14:28:54 +0300 | [diff] [blame] | 3514 | size_index[size_index_elem(i)] = 8; |
Christoph Lameter | 41d54d3 | 2008-07-03 09:14:26 -0500 | [diff] [blame] | 3515 | } |
| 3516 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3517 | /* Caches that are not of the two-to-the-power-of size */ |
| 3518 | if (KMALLOC_MIN_SIZE <= 32) { |
| 3519 | kmalloc_caches[1] = create_kmalloc_cache("kmalloc-96", 96, 0); |
| 3520 | caches++; |
| 3521 | } |
| 3522 | |
| 3523 | if (KMALLOC_MIN_SIZE <= 64) { |
| 3524 | kmalloc_caches[2] = create_kmalloc_cache("kmalloc-192", 192, 0); |
| 3525 | caches++; |
| 3526 | } |
| 3527 | |
| 3528 | for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) { |
| 3529 | kmalloc_caches[i] = create_kmalloc_cache("kmalloc", 1 << i, 0); |
| 3530 | caches++; |
| 3531 | } |
| 3532 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3533 | slab_state = UP; |
| 3534 | |
| 3535 | /* Provide the correct kmalloc names now that the caches are up */ |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3536 | if (KMALLOC_MIN_SIZE <= 32) { |
| 3537 | kmalloc_caches[1]->name = kstrdup(kmalloc_caches[1]->name, GFP_NOWAIT); |
| 3538 | BUG_ON(!kmalloc_caches[1]->name); |
| 3539 | } |
| 3540 | |
| 3541 | if (KMALLOC_MIN_SIZE <= 64) { |
| 3542 | kmalloc_caches[2]->name = kstrdup(kmalloc_caches[2]->name, GFP_NOWAIT); |
| 3543 | BUG_ON(!kmalloc_caches[2]->name); |
| 3544 | } |
| 3545 | |
Christoph Lameter | d7278bd | 2010-07-09 14:07:12 -0500 | [diff] [blame] | 3546 | for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) { |
| 3547 | char *s = kasprintf(GFP_NOWAIT, "kmalloc-%d", 1 << i); |
| 3548 | |
| 3549 | BUG_ON(!s); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3550 | kmalloc_caches[i]->name = s; |
Christoph Lameter | d7278bd | 2010-07-09 14:07:12 -0500 | [diff] [blame] | 3551 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3552 | |
| 3553 | #ifdef CONFIG_SMP |
| 3554 | register_cpu_notifier(&slab_notifier); |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 3555 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3556 | |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3557 | #ifdef CONFIG_ZONE_DMA |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3558 | for (i = 0; i < SLUB_PAGE_SHIFT; i++) { |
| 3559 | struct kmem_cache *s = kmalloc_caches[i]; |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3560 | |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3561 | if (s && s->size) { |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3562 | char *name = kasprintf(GFP_NOWAIT, |
| 3563 | "dma-kmalloc-%d", s->objsize); |
| 3564 | |
| 3565 | BUG_ON(!name); |
Christoph Lameter | 51df114 | 2010-08-20 12:37:15 -0500 | [diff] [blame] | 3566 | kmalloc_dma_caches[i] = create_kmalloc_cache(name, |
| 3567 | s->objsize, SLAB_CACHE_DMA); |
Christoph Lameter | 5513659 | 2010-08-20 12:37:13 -0500 | [diff] [blame] | 3568 | } |
| 3569 | } |
| 3570 | #endif |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 3571 | printk(KERN_INFO |
| 3572 | "SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, MinObjects=%d," |
Christoph Lameter | 4b356be | 2007-06-16 10:16:13 -0700 | [diff] [blame] | 3573 | " CPUs=%d, Nodes=%d\n", |
| 3574 | caches, cache_line_size(), |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3575 | slub_min_order, slub_max_order, slub_min_objects, |
| 3576 | nr_cpu_ids, nr_node_ids); |
| 3577 | } |
| 3578 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 3579 | void __init kmem_cache_init_late(void) |
| 3580 | { |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 3581 | } |
| 3582 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3583 | /* |
| 3584 | * Find a mergeable slab cache |
| 3585 | */ |
| 3586 | static int slab_unmergeable(struct kmem_cache *s) |
| 3587 | { |
| 3588 | if (slub_nomerge || (s->flags & SLUB_NEVER_MERGE)) |
| 3589 | return 1; |
| 3590 | |
Christoph Lameter | c59def9f | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 3591 | if (s->ctor) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3592 | return 1; |
| 3593 | |
Christoph Lameter | 8ffa687 | 2007-05-31 00:40:51 -0700 | [diff] [blame] | 3594 | /* |
| 3595 | * We may have set a slab to be unmergeable during bootstrap. |
| 3596 | */ |
| 3597 | if (s->refcount < 0) |
| 3598 | return 1; |
| 3599 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3600 | return 0; |
| 3601 | } |
| 3602 | |
| 3603 | static struct kmem_cache *find_mergeable(size_t size, |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3604 | size_t align, unsigned long flags, const char *name, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 3605 | void (*ctor)(void *)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3606 | { |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3607 | struct kmem_cache *s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3608 | |
| 3609 | if (slub_nomerge || (flags & SLUB_NEVER_MERGE)) |
| 3610 | return NULL; |
| 3611 | |
Christoph Lameter | c59def9f | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 3612 | if (ctor) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3613 | return NULL; |
| 3614 | |
| 3615 | size = ALIGN(size, sizeof(void *)); |
| 3616 | align = calculate_alignment(flags, align, size); |
| 3617 | size = ALIGN(size, align); |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3618 | flags = kmem_cache_flags(size, flags, name, NULL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3619 | |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3620 | list_for_each_entry(s, &slab_caches, list) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3621 | if (slab_unmergeable(s)) |
| 3622 | continue; |
| 3623 | |
| 3624 | if (size > s->size) |
| 3625 | continue; |
| 3626 | |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3627 | if ((flags & SLUB_MERGE_SAME) != (s->flags & SLUB_MERGE_SAME)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3628 | continue; |
| 3629 | /* |
| 3630 | * Check if alignment is compatible. |
| 3631 | * Courtesy of Adrian Drzewiecki |
| 3632 | */ |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3633 | if ((s->size & ~(align - 1)) != s->size) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3634 | continue; |
| 3635 | |
| 3636 | if (s->size - size >= sizeof(void *)) |
| 3637 | continue; |
| 3638 | |
| 3639 | return s; |
| 3640 | } |
| 3641 | return NULL; |
| 3642 | } |
| 3643 | |
| 3644 | struct kmem_cache *kmem_cache_create(const char *name, size_t size, |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 3645 | size_t align, unsigned long flags, void (*ctor)(void *)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3646 | { |
| 3647 | struct kmem_cache *s; |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3648 | char *n; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3649 | |
Benjamin Herrenschmidt | fe1ff49 | 2009-09-21 17:02:30 -0700 | [diff] [blame] | 3650 | if (WARN_ON(!name)) |
| 3651 | return NULL; |
| 3652 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3653 | down_write(&slub_lock); |
Christoph Lameter | ba0268a | 2007-09-11 15:24:11 -0700 | [diff] [blame] | 3654 | s = find_mergeable(size, align, flags, name, ctor); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3655 | if (s) { |
| 3656 | s->refcount++; |
| 3657 | /* |
| 3658 | * Adjust the object sizes so that we clear |
| 3659 | * the complete object on kzalloc. |
| 3660 | */ |
| 3661 | s->objsize = max(s->objsize, (int)size); |
| 3662 | s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *))); |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 3663 | |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3664 | if (sysfs_slab_alias(s, name)) { |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3665 | s->refcount--; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3666 | goto err; |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3667 | } |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 3668 | up_write(&slub_lock); |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3669 | return s; |
| 3670 | } |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 3671 | |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3672 | n = kstrdup(name, GFP_KERNEL); |
| 3673 | if (!n) |
| 3674 | goto err; |
| 3675 | |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3676 | s = kmalloc(kmem_size, GFP_KERNEL); |
| 3677 | if (s) { |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3678 | if (kmem_cache_open(s, n, |
Christoph Lameter | c59def9f | 2007-05-16 22:10:50 -0700 | [diff] [blame] | 3679 | size, align, flags, ctor)) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3680 | list_add(&s->list, &slab_caches); |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3681 | if (sysfs_slab_add(s)) { |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3682 | list_del(&s->list); |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3683 | kfree(n); |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3684 | kfree(s); |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3685 | goto err; |
David Rientjes | 7b8f3b6 | 2008-12-17 22:09:46 -0800 | [diff] [blame] | 3686 | } |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 3687 | up_write(&slub_lock); |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3688 | return s; |
| 3689 | } |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 3690 | kfree(n); |
Christoph Lameter | a0e1d1b | 2007-07-17 04:03:31 -0700 | [diff] [blame] | 3691 | kfree(s); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3692 | } |
Pavel Emelyanov | 68cee4f | 2010-10-28 13:50:37 +0400 | [diff] [blame] | 3693 | err: |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3694 | up_write(&slub_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3695 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3696 | if (flags & SLAB_PANIC) |
| 3697 | panic("Cannot create slabcache %s\n", name); |
| 3698 | else |
| 3699 | s = NULL; |
| 3700 | return s; |
| 3701 | } |
| 3702 | EXPORT_SYMBOL(kmem_cache_create); |
| 3703 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3704 | #ifdef CONFIG_SMP |
Christoph Lameter | 27390bc | 2007-06-01 00:47:09 -0700 | [diff] [blame] | 3705 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3706 | * Use the cpu notifier to insure that the cpu slabs are flushed when |
| 3707 | * necessary. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3708 | */ |
| 3709 | static int __cpuinit slab_cpuup_callback(struct notifier_block *nfb, |
| 3710 | unsigned long action, void *hcpu) |
| 3711 | { |
| 3712 | long cpu = (long)hcpu; |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3713 | struct kmem_cache *s; |
| 3714 | unsigned long flags; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3715 | |
| 3716 | switch (action) { |
| 3717 | case CPU_UP_CANCELED: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 3718 | case CPU_UP_CANCELED_FROZEN: |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3719 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 3720 | case CPU_DEAD_FROZEN: |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 3721 | down_read(&slub_lock); |
| 3722 | list_for_each_entry(s, &slab_caches, list) { |
| 3723 | local_irq_save(flags); |
| 3724 | __flush_cpu_slab(s, cpu); |
| 3725 | local_irq_restore(flags); |
| 3726 | } |
| 3727 | up_read(&slub_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3728 | break; |
| 3729 | default: |
| 3730 | break; |
| 3731 | } |
| 3732 | return NOTIFY_OK; |
| 3733 | } |
| 3734 | |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3735 | static struct notifier_block __cpuinitdata slab_notifier = { |
Ingo Molnar | 3adbefe | 2008-02-05 17:57:39 -0800 | [diff] [blame] | 3736 | .notifier_call = slab_cpuup_callback |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 3737 | }; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3738 | |
| 3739 | #endif |
| 3740 | |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3741 | void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3742 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3743 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3744 | void *ret; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3745 | |
Christoph Lameter | ffadd4d | 2009-02-17 12:05:07 -0500 | [diff] [blame] | 3746 | if (unlikely(size > SLUB_MAX_SIZE)) |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 3747 | return kmalloc_large(size, gfpflags); |
| 3748 | |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3749 | s = get_slab(size, gfpflags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3750 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 3751 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3752 | return s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3753 | |
Christoph Lameter | 2154a33 | 2010-07-09 14:07:10 -0500 | [diff] [blame] | 3754 | ret = slab_alloc(s, gfpflags, NUMA_NO_NODE, caller); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3755 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3756 | /* Honor the call site pointer we received. */ |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3757 | trace_kmalloc(caller, ret, size, s->size, gfpflags); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3758 | |
| 3759 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3760 | } |
| 3761 | |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 3762 | #ifdef CONFIG_NUMA |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3763 | void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3764 | int node, unsigned long caller) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3765 | { |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3766 | struct kmem_cache *s; |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3767 | void *ret; |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3768 | |
Xiaotian Feng | d3e14aa | 2010-04-08 17:26:44 +0800 | [diff] [blame] | 3769 | if (unlikely(size > SLUB_MAX_SIZE)) { |
| 3770 | ret = kmalloc_large_node(size, gfpflags, node); |
| 3771 | |
| 3772 | trace_kmalloc_node(caller, ret, |
| 3773 | size, PAGE_SIZE << get_order(size), |
| 3774 | gfpflags, node); |
| 3775 | |
| 3776 | return ret; |
| 3777 | } |
Pekka Enberg | eada35e | 2008-02-11 22:47:46 +0200 | [diff] [blame] | 3778 | |
Christoph Lameter | aadb4bc | 2007-10-16 01:24:38 -0700 | [diff] [blame] | 3779 | s = get_slab(size, gfpflags); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3780 | |
Satyam Sharma | 2408c55 | 2007-10-16 01:24:44 -0700 | [diff] [blame] | 3781 | if (unlikely(ZERO_OR_NULL_PTR(s))) |
Christoph Lameter | 6cb8f91 | 2007-07-17 04:03:22 -0700 | [diff] [blame] | 3782 | return s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3783 | |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3784 | ret = slab_alloc(s, gfpflags, node, caller); |
| 3785 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3786 | /* Honor the call site pointer we received. */ |
Eduard - Gabriel Munteanu | ca2b84c | 2009-03-23 15:12:24 +0200 | [diff] [blame] | 3787 | trace_kmalloc_node(caller, ret, size, s->size, gfpflags, node); |
Eduard - Gabriel Munteanu | 94b528d | 2008-08-24 20:49:35 +0300 | [diff] [blame] | 3788 | |
| 3789 | return ret; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3790 | } |
Namhyung Kim | 5d1f57e | 2010-09-29 21:02:15 +0900 | [diff] [blame] | 3791 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 3792 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 3793 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3794 | static int count_inuse(struct page *page) |
| 3795 | { |
| 3796 | return page->inuse; |
| 3797 | } |
| 3798 | |
| 3799 | static int count_total(struct page *page) |
| 3800 | { |
| 3801 | return page->objects; |
| 3802 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 3803 | #endif |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3804 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 3805 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3806 | static int validate_slab(struct kmem_cache *s, struct page *page, |
| 3807 | unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3808 | { |
| 3809 | void *p; |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 3810 | void *addr = page_address(page); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3811 | |
| 3812 | if (!check_slab(s, page) || |
| 3813 | !on_freelist(s, page, NULL)) |
| 3814 | return 0; |
| 3815 | |
| 3816 | /* Now we know that a valid freelist exists */ |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 3817 | bitmap_zero(map, page->objects); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3818 | |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 3819 | get_map(s, page, map); |
| 3820 | for_each_object(p, s, addr, page->objects) { |
| 3821 | if (test_bit(slab_index(p, s, addr), map)) |
| 3822 | if (!check_object(s, page, p, SLUB_RED_INACTIVE)) |
| 3823 | return 0; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3824 | } |
| 3825 | |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 3826 | for_each_object(p, s, addr, page->objects) |
Christoph Lameter | 7656c72 | 2007-05-09 02:32:40 -0700 | [diff] [blame] | 3827 | if (!test_bit(slab_index(p, s, addr), map)) |
Tero Roponen | 37d5744 | 2010-12-01 20:04:20 +0200 | [diff] [blame] | 3828 | if (!check_object(s, page, p, SLUB_RED_ACTIVE)) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3829 | return 0; |
| 3830 | return 1; |
| 3831 | } |
| 3832 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3833 | static void validate_slab_slab(struct kmem_cache *s, struct page *page, |
| 3834 | unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3835 | { |
Christoph Lameter | 881db7f | 2011-06-01 12:25:53 -0500 | [diff] [blame] | 3836 | slab_lock(page); |
| 3837 | validate_slab(s, page, map); |
| 3838 | slab_unlock(page); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3839 | } |
| 3840 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3841 | static int validate_slab_node(struct kmem_cache *s, |
| 3842 | struct kmem_cache_node *n, unsigned long *map) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3843 | { |
| 3844 | unsigned long count = 0; |
| 3845 | struct page *page; |
| 3846 | unsigned long flags; |
| 3847 | |
| 3848 | spin_lock_irqsave(&n->list_lock, flags); |
| 3849 | |
| 3850 | list_for_each_entry(page, &n->partial, lru) { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3851 | validate_slab_slab(s, page, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3852 | count++; |
| 3853 | } |
| 3854 | if (count != n->nr_partial) |
| 3855 | printk(KERN_ERR "SLUB %s: %ld partial slabs counted but " |
| 3856 | "counter=%ld\n", s->name, count, n->nr_partial); |
| 3857 | |
| 3858 | if (!(s->flags & SLAB_STORE_USER)) |
| 3859 | goto out; |
| 3860 | |
| 3861 | list_for_each_entry(page, &n->full, lru) { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3862 | validate_slab_slab(s, page, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3863 | count++; |
| 3864 | } |
| 3865 | if (count != atomic_long_read(&n->nr_slabs)) |
| 3866 | printk(KERN_ERR "SLUB: %s %ld slabs counted but " |
| 3867 | "counter=%ld\n", s->name, count, |
| 3868 | atomic_long_read(&n->nr_slabs)); |
| 3869 | |
| 3870 | out: |
| 3871 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 3872 | return count; |
| 3873 | } |
| 3874 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3875 | static long validate_slab_cache(struct kmem_cache *s) |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3876 | { |
| 3877 | int node; |
| 3878 | unsigned long count = 0; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 3879 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3880 | sizeof(unsigned long), GFP_KERNEL); |
| 3881 | |
| 3882 | if (!map) |
| 3883 | return -ENOMEM; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3884 | |
| 3885 | flush_all(s); |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 3886 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3887 | struct kmem_cache_node *n = get_node(s, node); |
| 3888 | |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3889 | count += validate_slab_node(s, n, map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3890 | } |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 3891 | kfree(map); |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 3892 | return count; |
| 3893 | } |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3894 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3895 | * Generate lists of code addresses where slabcache objects are allocated |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3896 | * and freed. |
| 3897 | */ |
| 3898 | |
| 3899 | struct location { |
| 3900 | unsigned long count; |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3901 | unsigned long addr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3902 | long long sum_time; |
| 3903 | long min_time; |
| 3904 | long max_time; |
| 3905 | long min_pid; |
| 3906 | long max_pid; |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 3907 | DECLARE_BITMAP(cpus, NR_CPUS); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3908 | nodemask_t nodes; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3909 | }; |
| 3910 | |
| 3911 | struct loc_track { |
| 3912 | unsigned long max; |
| 3913 | unsigned long count; |
| 3914 | struct location *loc; |
| 3915 | }; |
| 3916 | |
| 3917 | static void free_loc_track(struct loc_track *t) |
| 3918 | { |
| 3919 | if (t->max) |
| 3920 | free_pages((unsigned long)t->loc, |
| 3921 | get_order(sizeof(struct location) * t->max)); |
| 3922 | } |
| 3923 | |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 3924 | static int alloc_loc_track(struct loc_track *t, unsigned long max, gfp_t flags) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3925 | { |
| 3926 | struct location *l; |
| 3927 | int order; |
| 3928 | |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3929 | order = get_order(sizeof(struct location) * max); |
| 3930 | |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 3931 | l = (void *)__get_free_pages(flags, order); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3932 | if (!l) |
| 3933 | return 0; |
| 3934 | |
| 3935 | if (t->count) { |
| 3936 | memcpy(l, t->loc, sizeof(struct location) * t->count); |
| 3937 | free_loc_track(t); |
| 3938 | } |
| 3939 | t->max = max; |
| 3940 | t->loc = l; |
| 3941 | return 1; |
| 3942 | } |
| 3943 | |
| 3944 | static int add_location(struct loc_track *t, struct kmem_cache *s, |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3945 | const struct track *track) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3946 | { |
| 3947 | long start, end, pos; |
| 3948 | struct location *l; |
Eduard - Gabriel Munteanu | ce71e27 | 2008-08-19 20:43:25 +0300 | [diff] [blame] | 3949 | unsigned long caddr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3950 | unsigned long age = jiffies - track->when; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3951 | |
| 3952 | start = -1; |
| 3953 | end = t->count; |
| 3954 | |
| 3955 | for ( ; ; ) { |
| 3956 | pos = start + (end - start + 1) / 2; |
| 3957 | |
| 3958 | /* |
| 3959 | * There is nothing at "end". If we end up there |
| 3960 | * we need to add something to before end. |
| 3961 | */ |
| 3962 | if (pos == end) |
| 3963 | break; |
| 3964 | |
| 3965 | caddr = t->loc[pos].addr; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3966 | if (track->addr == caddr) { |
| 3967 | |
| 3968 | l = &t->loc[pos]; |
| 3969 | l->count++; |
| 3970 | if (track->when) { |
| 3971 | l->sum_time += age; |
| 3972 | if (age < l->min_time) |
| 3973 | l->min_time = age; |
| 3974 | if (age > l->max_time) |
| 3975 | l->max_time = age; |
| 3976 | |
| 3977 | if (track->pid < l->min_pid) |
| 3978 | l->min_pid = track->pid; |
| 3979 | if (track->pid > l->max_pid) |
| 3980 | l->max_pid = track->pid; |
| 3981 | |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 3982 | cpumask_set_cpu(track->cpu, |
| 3983 | to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3984 | } |
| 3985 | node_set(page_to_nid(virt_to_page(track)), l->nodes); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3986 | return 1; |
| 3987 | } |
| 3988 | |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 3989 | if (track->addr < caddr) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3990 | end = pos; |
| 3991 | else |
| 3992 | start = pos; |
| 3993 | } |
| 3994 | |
| 3995 | /* |
Christoph Lameter | 672bba3 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 3996 | * Not found. Insert new tracking element. |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3997 | */ |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 3998 | if (t->count >= t->max && !alloc_loc_track(t, 2 * t->max, GFP_ATOMIC)) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 3999 | return 0; |
| 4000 | |
| 4001 | l = t->loc + pos; |
| 4002 | if (pos < t->count) |
| 4003 | memmove(l + 1, l, |
| 4004 | (t->count - pos) * sizeof(struct location)); |
| 4005 | t->count++; |
| 4006 | l->count = 1; |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4007 | l->addr = track->addr; |
| 4008 | l->sum_time = age; |
| 4009 | l->min_time = age; |
| 4010 | l->max_time = age; |
| 4011 | l->min_pid = track->pid; |
| 4012 | l->max_pid = track->pid; |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4013 | cpumask_clear(to_cpumask(l->cpus)); |
| 4014 | cpumask_set_cpu(track->cpu, to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4015 | nodes_clear(l->nodes); |
| 4016 | node_set(page_to_nid(virt_to_page(track)), l->nodes); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4017 | return 1; |
| 4018 | } |
| 4019 | |
| 4020 | static void process_slab(struct loc_track *t, struct kmem_cache *s, |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4021 | struct page *page, enum track_item alloc, |
Namhyung Kim | a5dd5c1 | 2010-09-29 21:02:13 +0900 | [diff] [blame] | 4022 | unsigned long *map) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4023 | { |
Christoph Lameter | a973e9d | 2008-03-01 13:40:44 -0800 | [diff] [blame] | 4024 | void *addr = page_address(page); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4025 | void *p; |
| 4026 | |
Christoph Lameter | 39b2646 | 2008-04-14 19:11:30 +0300 | [diff] [blame] | 4027 | bitmap_zero(map, page->objects); |
Christoph Lameter | 5f80b13 | 2011-04-15 14:48:13 -0500 | [diff] [blame] | 4028 | get_map(s, page, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4029 | |
Christoph Lameter | 224a88b | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4030 | for_each_object(p, s, addr, page->objects) |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4031 | if (!test_bit(slab_index(p, s, addr), map)) |
| 4032 | add_location(t, s, get_track(s, p, alloc)); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4033 | } |
| 4034 | |
| 4035 | static int list_locations(struct kmem_cache *s, char *buf, |
| 4036 | enum track_item alloc) |
| 4037 | { |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4038 | int len = 0; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4039 | unsigned long i; |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4040 | struct loc_track t = { 0, 0, NULL }; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4041 | int node; |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4042 | unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) * |
| 4043 | sizeof(unsigned long), GFP_KERNEL); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4044 | |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4045 | if (!map || !alloc_loc_track(&t, PAGE_SIZE / sizeof(struct location), |
| 4046 | GFP_TEMPORARY)) { |
| 4047 | kfree(map); |
Christoph Lameter | 68dff6a | 2007-07-17 04:03:20 -0700 | [diff] [blame] | 4048 | return sprintf(buf, "Out of memory\n"); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4049 | } |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4050 | /* Push back cpu slabs */ |
| 4051 | flush_all(s); |
| 4052 | |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 4053 | for_each_node_state(node, N_NORMAL_MEMORY) { |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4054 | struct kmem_cache_node *n = get_node(s, node); |
| 4055 | unsigned long flags; |
| 4056 | struct page *page; |
| 4057 | |
Christoph Lameter | 9e86943 | 2007-08-22 14:01:56 -0700 | [diff] [blame] | 4058 | if (!atomic_long_read(&n->nr_slabs)) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4059 | continue; |
| 4060 | |
| 4061 | spin_lock_irqsave(&n->list_lock, flags); |
| 4062 | list_for_each_entry(page, &n->partial, lru) |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4063 | process_slab(&t, s, page, alloc, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4064 | list_for_each_entry(page, &n->full, lru) |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4065 | process_slab(&t, s, page, alloc, map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4066 | spin_unlock_irqrestore(&n->list_lock, flags); |
| 4067 | } |
| 4068 | |
| 4069 | for (i = 0; i < t.count; i++) { |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4070 | struct location *l = &t.loc[i]; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4071 | |
Hugh Dickins | 9c24624 | 2008-12-09 13:14:27 -0800 | [diff] [blame] | 4072 | if (len > PAGE_SIZE - KSYM_SYMBOL_LEN - 100) |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4073 | break; |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4074 | len += sprintf(buf + len, "%7ld ", l->count); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4075 | |
| 4076 | if (l->addr) |
Joe Perches | 62c70bc | 2011-01-13 15:45:52 -0800 | [diff] [blame] | 4077 | len += sprintf(buf + len, "%pS", (void *)l->addr); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4078 | else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4079 | len += sprintf(buf + len, "<not-available>"); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4080 | |
| 4081 | if (l->sum_time != l->min_time) { |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4082 | len += sprintf(buf + len, " age=%ld/%ld/%ld", |
Roman Zippel | f8bd225 | 2008-05-01 04:34:31 -0700 | [diff] [blame] | 4083 | l->min_time, |
| 4084 | (long)div_u64(l->sum_time, l->count), |
| 4085 | l->max_time); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4086 | } else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4087 | len += sprintf(buf + len, " age=%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4088 | l->min_time); |
| 4089 | |
| 4090 | if (l->min_pid != l->max_pid) |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4091 | len += sprintf(buf + len, " pid=%ld-%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4092 | l->min_pid, l->max_pid); |
| 4093 | else |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4094 | len += sprintf(buf + len, " pid=%ld", |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4095 | l->min_pid); |
| 4096 | |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4097 | if (num_online_cpus() > 1 && |
| 4098 | !cpumask_empty(to_cpumask(l->cpus)) && |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4099 | len < PAGE_SIZE - 60) { |
| 4100 | len += sprintf(buf + len, " cpus="); |
| 4101 | len += cpulist_scnprintf(buf + len, PAGE_SIZE - len - 50, |
Rusty Russell | 174596a | 2009-01-01 10:12:29 +1030 | [diff] [blame] | 4102 | to_cpumask(l->cpus)); |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4103 | } |
| 4104 | |
Christoph Lameter | 62bc62a | 2009-06-16 15:32:15 -0700 | [diff] [blame] | 4105 | if (nr_online_nodes > 1 && !nodes_empty(l->nodes) && |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4106 | len < PAGE_SIZE - 60) { |
| 4107 | len += sprintf(buf + len, " nodes="); |
| 4108 | len += nodelist_scnprintf(buf + len, PAGE_SIZE - len - 50, |
Christoph Lameter | 45edfa5 | 2007-05-09 02:32:45 -0700 | [diff] [blame] | 4109 | l->nodes); |
| 4110 | } |
| 4111 | |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4112 | len += sprintf(buf + len, "\n"); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4113 | } |
| 4114 | |
| 4115 | free_loc_track(&t); |
Eric Dumazet | bbd7d57 | 2010-03-24 22:25:47 +0100 | [diff] [blame] | 4116 | kfree(map); |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4117 | if (!t.count) |
Harvey Harrison | e374d48 | 2008-01-31 15:20:50 -0800 | [diff] [blame] | 4118 | len += sprintf(buf, "No data\n"); |
| 4119 | return len; |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4120 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4121 | #endif |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4122 | |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4123 | #ifdef SLUB_RESILIENCY_TEST |
| 4124 | static void resiliency_test(void) |
| 4125 | { |
| 4126 | u8 *p; |
| 4127 | |
| 4128 | BUILD_BUG_ON(KMALLOC_MIN_SIZE > 16 || SLUB_PAGE_SHIFT < 10); |
| 4129 | |
| 4130 | printk(KERN_ERR "SLUB resiliency testing\n"); |
| 4131 | printk(KERN_ERR "-----------------------\n"); |
| 4132 | printk(KERN_ERR "A. Corruption after allocation\n"); |
| 4133 | |
| 4134 | p = kzalloc(16, GFP_KERNEL); |
| 4135 | p[16] = 0x12; |
| 4136 | printk(KERN_ERR "\n1. kmalloc-16: Clobber Redzone/next pointer" |
| 4137 | " 0x12->0x%p\n\n", p + 16); |
| 4138 | |
| 4139 | validate_slab_cache(kmalloc_caches[4]); |
| 4140 | |
| 4141 | /* Hmmm... The next two are dangerous */ |
| 4142 | p = kzalloc(32, GFP_KERNEL); |
| 4143 | p[32 + sizeof(void *)] = 0x34; |
| 4144 | printk(KERN_ERR "\n2. kmalloc-32: Clobber next pointer/next slab" |
| 4145 | " 0x34 -> -0x%p\n", p); |
| 4146 | printk(KERN_ERR |
| 4147 | "If allocated object is overwritten then not detectable\n\n"); |
| 4148 | |
| 4149 | validate_slab_cache(kmalloc_caches[5]); |
| 4150 | p = kzalloc(64, GFP_KERNEL); |
| 4151 | p += 64 + (get_cycles() & 0xff) * sizeof(void *); |
| 4152 | *p = 0x56; |
| 4153 | printk(KERN_ERR "\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n", |
| 4154 | p); |
| 4155 | printk(KERN_ERR |
| 4156 | "If allocated object is overwritten then not detectable\n\n"); |
| 4157 | validate_slab_cache(kmalloc_caches[6]); |
| 4158 | |
| 4159 | printk(KERN_ERR "\nB. Corruption after free\n"); |
| 4160 | p = kzalloc(128, GFP_KERNEL); |
| 4161 | kfree(p); |
| 4162 | *p = 0x78; |
| 4163 | printk(KERN_ERR "1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p); |
| 4164 | validate_slab_cache(kmalloc_caches[7]); |
| 4165 | |
| 4166 | p = kzalloc(256, GFP_KERNEL); |
| 4167 | kfree(p); |
| 4168 | p[50] = 0x9a; |
| 4169 | printk(KERN_ERR "\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", |
| 4170 | p); |
| 4171 | validate_slab_cache(kmalloc_caches[8]); |
| 4172 | |
| 4173 | p = kzalloc(512, GFP_KERNEL); |
| 4174 | kfree(p); |
| 4175 | p[512] = 0xab; |
| 4176 | printk(KERN_ERR "\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p); |
| 4177 | validate_slab_cache(kmalloc_caches[9]); |
| 4178 | } |
| 4179 | #else |
| 4180 | #ifdef CONFIG_SYSFS |
| 4181 | static void resiliency_test(void) {}; |
| 4182 | #endif |
| 4183 | #endif |
| 4184 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4185 | #ifdef CONFIG_SYSFS |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4186 | enum slab_stat_type { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4187 | SL_ALL, /* All slabs */ |
| 4188 | SL_PARTIAL, /* Only partially allocated slabs */ |
| 4189 | SL_CPU, /* Only slabs used for cpu caches */ |
| 4190 | SL_OBJECTS, /* Determine allocated objects not slabs */ |
| 4191 | SL_TOTAL /* Determine object capacity not slabs */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4192 | }; |
| 4193 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4194 | #define SO_ALL (1 << SL_ALL) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4195 | #define SO_PARTIAL (1 << SL_PARTIAL) |
| 4196 | #define SO_CPU (1 << SL_CPU) |
| 4197 | #define SO_OBJECTS (1 << SL_OBJECTS) |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4198 | #define SO_TOTAL (1 << SL_TOTAL) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4199 | |
Cyrill Gorcunov | 62e5c4b | 2008-03-02 23:28:24 +0300 | [diff] [blame] | 4200 | static ssize_t show_slab_objects(struct kmem_cache *s, |
| 4201 | char *buf, unsigned long flags) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4202 | { |
| 4203 | unsigned long total = 0; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4204 | int node; |
| 4205 | int x; |
| 4206 | unsigned long *nodes; |
| 4207 | unsigned long *per_cpu; |
| 4208 | |
| 4209 | nodes = kzalloc(2 * sizeof(unsigned long) * nr_node_ids, GFP_KERNEL); |
Cyrill Gorcunov | 62e5c4b | 2008-03-02 23:28:24 +0300 | [diff] [blame] | 4210 | if (!nodes) |
| 4211 | return -ENOMEM; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4212 | per_cpu = nodes + nr_node_ids; |
| 4213 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4214 | if (flags & SO_CPU) { |
| 4215 | int cpu; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4216 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4217 | for_each_possible_cpu(cpu) { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 4218 | struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4219 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4220 | if (!c || c->node < 0) |
| 4221 | continue; |
| 4222 | |
| 4223 | if (c->page) { |
| 4224 | if (flags & SO_TOTAL) |
| 4225 | x = c->page->objects; |
| 4226 | else if (flags & SO_OBJECTS) |
| 4227 | x = c->page->inuse; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4228 | else |
| 4229 | x = 1; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4230 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4231 | total += x; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4232 | nodes[c->node] += x; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4233 | } |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4234 | per_cpu[c->node]++; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4235 | } |
| 4236 | } |
| 4237 | |
Christoph Lameter | 04d9487 | 2011-01-10 10:15:15 -0600 | [diff] [blame] | 4238 | lock_memory_hotplug(); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4239 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4240 | if (flags & SO_ALL) { |
| 4241 | for_each_node_state(node, N_NORMAL_MEMORY) { |
| 4242 | struct kmem_cache_node *n = get_node(s, node); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4243 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4244 | if (flags & SO_TOTAL) |
| 4245 | x = atomic_long_read(&n->total_objects); |
| 4246 | else if (flags & SO_OBJECTS) |
| 4247 | x = atomic_long_read(&n->total_objects) - |
| 4248 | count_partial(n, count_free); |
| 4249 | |
| 4250 | else |
| 4251 | x = atomic_long_read(&n->nr_slabs); |
| 4252 | total += x; |
| 4253 | nodes[node] += x; |
| 4254 | } |
| 4255 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4256 | } else |
| 4257 | #endif |
| 4258 | if (flags & SO_PARTIAL) { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4259 | for_each_node_state(node, N_NORMAL_MEMORY) { |
| 4260 | struct kmem_cache_node *n = get_node(s, node); |
| 4261 | |
| 4262 | if (flags & SO_TOTAL) |
| 4263 | x = count_partial(n, count_total); |
| 4264 | else if (flags & SO_OBJECTS) |
| 4265 | x = count_partial(n, count_inuse); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4266 | else |
| 4267 | x = n->nr_partial; |
| 4268 | total += x; |
| 4269 | nodes[node] += x; |
| 4270 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4271 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4272 | x = sprintf(buf, "%lu", total); |
| 4273 | #ifdef CONFIG_NUMA |
Christoph Lameter | f64dc58 | 2007-10-16 01:25:33 -0700 | [diff] [blame] | 4274 | for_each_node_state(node, N_NORMAL_MEMORY) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4275 | if (nodes[node]) |
| 4276 | x += sprintf(buf + x, " N%d=%lu", |
| 4277 | node, nodes[node]); |
| 4278 | #endif |
Christoph Lameter | 04d9487 | 2011-01-10 10:15:15 -0600 | [diff] [blame] | 4279 | unlock_memory_hotplug(); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4280 | kfree(nodes); |
| 4281 | return x + sprintf(buf + x, "\n"); |
| 4282 | } |
| 4283 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4284 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4285 | static int any_slab_objects(struct kmem_cache *s) |
| 4286 | { |
| 4287 | int node; |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4288 | |
| 4289 | for_each_online_node(node) { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4290 | struct kmem_cache_node *n = get_node(s, node); |
| 4291 | |
Christoph Lameter | dfb4f09 | 2007-10-16 01:26:05 -0700 | [diff] [blame] | 4292 | if (!n) |
| 4293 | continue; |
| 4294 | |
Benjamin Herrenschmidt | 4ea33e2 | 2008-05-06 20:42:39 -0700 | [diff] [blame] | 4295 | if (atomic_long_read(&n->total_objects)) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4296 | return 1; |
| 4297 | } |
| 4298 | return 0; |
| 4299 | } |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4300 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4301 | |
| 4302 | #define to_slab_attr(n) container_of(n, struct slab_attribute, attr) |
| 4303 | #define to_slab(n) container_of(n, struct kmem_cache, kobj); |
| 4304 | |
| 4305 | struct slab_attribute { |
| 4306 | struct attribute attr; |
| 4307 | ssize_t (*show)(struct kmem_cache *s, char *buf); |
| 4308 | ssize_t (*store)(struct kmem_cache *s, const char *x, size_t count); |
| 4309 | }; |
| 4310 | |
| 4311 | #define SLAB_ATTR_RO(_name) \ |
| 4312 | static struct slab_attribute _name##_attr = __ATTR_RO(_name) |
| 4313 | |
| 4314 | #define SLAB_ATTR(_name) \ |
| 4315 | static struct slab_attribute _name##_attr = \ |
| 4316 | __ATTR(_name, 0644, _name##_show, _name##_store) |
| 4317 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4318 | static ssize_t slab_size_show(struct kmem_cache *s, char *buf) |
| 4319 | { |
| 4320 | return sprintf(buf, "%d\n", s->size); |
| 4321 | } |
| 4322 | SLAB_ATTR_RO(slab_size); |
| 4323 | |
| 4324 | static ssize_t align_show(struct kmem_cache *s, char *buf) |
| 4325 | { |
| 4326 | return sprintf(buf, "%d\n", s->align); |
| 4327 | } |
| 4328 | SLAB_ATTR_RO(align); |
| 4329 | |
| 4330 | static ssize_t object_size_show(struct kmem_cache *s, char *buf) |
| 4331 | { |
| 4332 | return sprintf(buf, "%d\n", s->objsize); |
| 4333 | } |
| 4334 | SLAB_ATTR_RO(object_size); |
| 4335 | |
| 4336 | static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf) |
| 4337 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4338 | return sprintf(buf, "%d\n", oo_objects(s->oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4339 | } |
| 4340 | SLAB_ATTR_RO(objs_per_slab); |
| 4341 | |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4342 | static ssize_t order_store(struct kmem_cache *s, |
| 4343 | const char *buf, size_t length) |
| 4344 | { |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4345 | unsigned long order; |
| 4346 | int err; |
| 4347 | |
| 4348 | err = strict_strtoul(buf, 10, &order); |
| 4349 | if (err) |
| 4350 | return err; |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4351 | |
| 4352 | if (order > slub_max_order || order < slub_min_order) |
| 4353 | return -EINVAL; |
| 4354 | |
| 4355 | calculate_sizes(s, order); |
| 4356 | return length; |
| 4357 | } |
| 4358 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4359 | static ssize_t order_show(struct kmem_cache *s, char *buf) |
| 4360 | { |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 4361 | return sprintf(buf, "%d\n", oo_order(s->oo)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4362 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4363 | SLAB_ATTR(order); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4364 | |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4365 | static ssize_t min_partial_show(struct kmem_cache *s, char *buf) |
| 4366 | { |
| 4367 | return sprintf(buf, "%lu\n", s->min_partial); |
| 4368 | } |
| 4369 | |
| 4370 | static ssize_t min_partial_store(struct kmem_cache *s, const char *buf, |
| 4371 | size_t length) |
| 4372 | { |
| 4373 | unsigned long min; |
| 4374 | int err; |
| 4375 | |
| 4376 | err = strict_strtoul(buf, 10, &min); |
| 4377 | if (err) |
| 4378 | return err; |
| 4379 | |
David Rientjes | c0bdb23 | 2009-02-25 09:16:35 +0200 | [diff] [blame] | 4380 | set_min_partial(s, min); |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4381 | return length; |
| 4382 | } |
| 4383 | SLAB_ATTR(min_partial); |
| 4384 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4385 | static ssize_t ctor_show(struct kmem_cache *s, char *buf) |
| 4386 | { |
Joe Perches | 62c70bc | 2011-01-13 15:45:52 -0800 | [diff] [blame] | 4387 | if (!s->ctor) |
| 4388 | return 0; |
| 4389 | return sprintf(buf, "%pS\n", s->ctor); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4390 | } |
| 4391 | SLAB_ATTR_RO(ctor); |
| 4392 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4393 | static ssize_t aliases_show(struct kmem_cache *s, char *buf) |
| 4394 | { |
| 4395 | return sprintf(buf, "%d\n", s->refcount - 1); |
| 4396 | } |
| 4397 | SLAB_ATTR_RO(aliases); |
| 4398 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4399 | static ssize_t partial_show(struct kmem_cache *s, char *buf) |
| 4400 | { |
Christoph Lameter | d9acf4b | 2008-02-15 15:22:21 -0800 | [diff] [blame] | 4401 | return show_slab_objects(s, buf, SO_PARTIAL); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4402 | } |
| 4403 | SLAB_ATTR_RO(partial); |
| 4404 | |
| 4405 | static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf) |
| 4406 | { |
Christoph Lameter | d9acf4b | 2008-02-15 15:22:21 -0800 | [diff] [blame] | 4407 | return show_slab_objects(s, buf, SO_CPU); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4408 | } |
| 4409 | SLAB_ATTR_RO(cpu_slabs); |
| 4410 | |
| 4411 | static ssize_t objects_show(struct kmem_cache *s, char *buf) |
| 4412 | { |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4413 | return show_slab_objects(s, buf, SO_ALL|SO_OBJECTS); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4414 | } |
| 4415 | SLAB_ATTR_RO(objects); |
| 4416 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4417 | static ssize_t objects_partial_show(struct kmem_cache *s, char *buf) |
| 4418 | { |
| 4419 | return show_slab_objects(s, buf, SO_PARTIAL|SO_OBJECTS); |
| 4420 | } |
| 4421 | SLAB_ATTR_RO(objects_partial); |
| 4422 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4423 | static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf) |
| 4424 | { |
| 4425 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT)); |
| 4426 | } |
| 4427 | |
| 4428 | static ssize_t reclaim_account_store(struct kmem_cache *s, |
| 4429 | const char *buf, size_t length) |
| 4430 | { |
| 4431 | s->flags &= ~SLAB_RECLAIM_ACCOUNT; |
| 4432 | if (buf[0] == '1') |
| 4433 | s->flags |= SLAB_RECLAIM_ACCOUNT; |
| 4434 | return length; |
| 4435 | } |
| 4436 | SLAB_ATTR(reclaim_account); |
| 4437 | |
| 4438 | static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf) |
| 4439 | { |
Christoph Lameter | 5af6083 | 2007-05-06 14:49:56 -0700 | [diff] [blame] | 4440 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN)); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4441 | } |
| 4442 | SLAB_ATTR_RO(hwcache_align); |
| 4443 | |
| 4444 | #ifdef CONFIG_ZONE_DMA |
| 4445 | static ssize_t cache_dma_show(struct kmem_cache *s, char *buf) |
| 4446 | { |
| 4447 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA)); |
| 4448 | } |
| 4449 | SLAB_ATTR_RO(cache_dma); |
| 4450 | #endif |
| 4451 | |
| 4452 | static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf) |
| 4453 | { |
| 4454 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_DESTROY_BY_RCU)); |
| 4455 | } |
| 4456 | SLAB_ATTR_RO(destroy_by_rcu); |
| 4457 | |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 4458 | static ssize_t reserved_show(struct kmem_cache *s, char *buf) |
| 4459 | { |
| 4460 | return sprintf(buf, "%d\n", s->reserved); |
| 4461 | } |
| 4462 | SLAB_ATTR_RO(reserved); |
| 4463 | |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4464 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4465 | static ssize_t slabs_show(struct kmem_cache *s, char *buf) |
| 4466 | { |
| 4467 | return show_slab_objects(s, buf, SO_ALL); |
| 4468 | } |
| 4469 | SLAB_ATTR_RO(slabs); |
| 4470 | |
| 4471 | static ssize_t total_objects_show(struct kmem_cache *s, char *buf) |
| 4472 | { |
| 4473 | return show_slab_objects(s, buf, SO_ALL|SO_TOTAL); |
| 4474 | } |
| 4475 | SLAB_ATTR_RO(total_objects); |
| 4476 | |
| 4477 | static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf) |
| 4478 | { |
| 4479 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_DEBUG_FREE)); |
| 4480 | } |
| 4481 | |
| 4482 | static ssize_t sanity_checks_store(struct kmem_cache *s, |
| 4483 | const char *buf, size_t length) |
| 4484 | { |
| 4485 | s->flags &= ~SLAB_DEBUG_FREE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4486 | if (buf[0] == '1') { |
| 4487 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4488 | s->flags |= SLAB_DEBUG_FREE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4489 | } |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4490 | return length; |
| 4491 | } |
| 4492 | SLAB_ATTR(sanity_checks); |
| 4493 | |
| 4494 | static ssize_t trace_show(struct kmem_cache *s, char *buf) |
| 4495 | { |
| 4496 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_TRACE)); |
| 4497 | } |
| 4498 | |
| 4499 | static ssize_t trace_store(struct kmem_cache *s, const char *buf, |
| 4500 | size_t length) |
| 4501 | { |
| 4502 | s->flags &= ~SLAB_TRACE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4503 | if (buf[0] == '1') { |
| 4504 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4505 | s->flags |= SLAB_TRACE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4506 | } |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4507 | return length; |
| 4508 | } |
| 4509 | SLAB_ATTR(trace); |
| 4510 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4511 | static ssize_t red_zone_show(struct kmem_cache *s, char *buf) |
| 4512 | { |
| 4513 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE)); |
| 4514 | } |
| 4515 | |
| 4516 | static ssize_t red_zone_store(struct kmem_cache *s, |
| 4517 | const char *buf, size_t length) |
| 4518 | { |
| 4519 | if (any_slab_objects(s)) |
| 4520 | return -EBUSY; |
| 4521 | |
| 4522 | s->flags &= ~SLAB_RED_ZONE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4523 | if (buf[0] == '1') { |
| 4524 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4525 | s->flags |= SLAB_RED_ZONE; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4526 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4527 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4528 | return length; |
| 4529 | } |
| 4530 | SLAB_ATTR(red_zone); |
| 4531 | |
| 4532 | static ssize_t poison_show(struct kmem_cache *s, char *buf) |
| 4533 | { |
| 4534 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_POISON)); |
| 4535 | } |
| 4536 | |
| 4537 | static ssize_t poison_store(struct kmem_cache *s, |
| 4538 | const char *buf, size_t length) |
| 4539 | { |
| 4540 | if (any_slab_objects(s)) |
| 4541 | return -EBUSY; |
| 4542 | |
| 4543 | s->flags &= ~SLAB_POISON; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4544 | if (buf[0] == '1') { |
| 4545 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4546 | s->flags |= SLAB_POISON; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4547 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4548 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4549 | return length; |
| 4550 | } |
| 4551 | SLAB_ATTR(poison); |
| 4552 | |
| 4553 | static ssize_t store_user_show(struct kmem_cache *s, char *buf) |
| 4554 | { |
| 4555 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_STORE_USER)); |
| 4556 | } |
| 4557 | |
| 4558 | static ssize_t store_user_store(struct kmem_cache *s, |
| 4559 | const char *buf, size_t length) |
| 4560 | { |
| 4561 | if (any_slab_objects(s)) |
| 4562 | return -EBUSY; |
| 4563 | |
| 4564 | s->flags &= ~SLAB_STORE_USER; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4565 | if (buf[0] == '1') { |
| 4566 | s->flags &= ~__CMPXCHG_DOUBLE; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4567 | s->flags |= SLAB_STORE_USER; |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4568 | } |
Christoph Lameter | 06b285d | 2008-04-14 19:11:41 +0300 | [diff] [blame] | 4569 | calculate_sizes(s, -1); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4570 | return length; |
| 4571 | } |
| 4572 | SLAB_ATTR(store_user); |
| 4573 | |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4574 | static ssize_t validate_show(struct kmem_cache *s, char *buf) |
| 4575 | { |
| 4576 | return 0; |
| 4577 | } |
| 4578 | |
| 4579 | static ssize_t validate_store(struct kmem_cache *s, |
| 4580 | const char *buf, size_t length) |
| 4581 | { |
Christoph Lameter | 434e245 | 2007-07-17 04:03:30 -0700 | [diff] [blame] | 4582 | int ret = -EINVAL; |
| 4583 | |
| 4584 | if (buf[0] == '1') { |
| 4585 | ret = validate_slab_cache(s); |
| 4586 | if (ret >= 0) |
| 4587 | ret = length; |
| 4588 | } |
| 4589 | return ret; |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4590 | } |
| 4591 | SLAB_ATTR(validate); |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4592 | |
| 4593 | static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf) |
| 4594 | { |
| 4595 | if (!(s->flags & SLAB_STORE_USER)) |
| 4596 | return -ENOSYS; |
| 4597 | return list_locations(s, buf, TRACK_ALLOC); |
| 4598 | } |
| 4599 | SLAB_ATTR_RO(alloc_calls); |
| 4600 | |
| 4601 | static ssize_t free_calls_show(struct kmem_cache *s, char *buf) |
| 4602 | { |
| 4603 | if (!(s->flags & SLAB_STORE_USER)) |
| 4604 | return -ENOSYS; |
| 4605 | return list_locations(s, buf, TRACK_FREE); |
| 4606 | } |
| 4607 | SLAB_ATTR_RO(free_calls); |
| 4608 | #endif /* CONFIG_SLUB_DEBUG */ |
| 4609 | |
| 4610 | #ifdef CONFIG_FAILSLAB |
| 4611 | static ssize_t failslab_show(struct kmem_cache *s, char *buf) |
| 4612 | { |
| 4613 | return sprintf(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB)); |
| 4614 | } |
| 4615 | |
| 4616 | static ssize_t failslab_store(struct kmem_cache *s, const char *buf, |
| 4617 | size_t length) |
| 4618 | { |
| 4619 | s->flags &= ~SLAB_FAILSLAB; |
| 4620 | if (buf[0] == '1') |
| 4621 | s->flags |= SLAB_FAILSLAB; |
| 4622 | return length; |
| 4623 | } |
| 4624 | SLAB_ATTR(failslab); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4625 | #endif |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4626 | |
Christoph Lameter | 2086d26 | 2007-05-06 14:49:46 -0700 | [diff] [blame] | 4627 | static ssize_t shrink_show(struct kmem_cache *s, char *buf) |
| 4628 | { |
| 4629 | return 0; |
| 4630 | } |
| 4631 | |
| 4632 | static ssize_t shrink_store(struct kmem_cache *s, |
| 4633 | const char *buf, size_t length) |
| 4634 | { |
| 4635 | if (buf[0] == '1') { |
| 4636 | int rc = kmem_cache_shrink(s); |
| 4637 | |
| 4638 | if (rc) |
| 4639 | return rc; |
| 4640 | } else |
| 4641 | return -EINVAL; |
| 4642 | return length; |
| 4643 | } |
| 4644 | SLAB_ATTR(shrink); |
| 4645 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4646 | #ifdef CONFIG_NUMA |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4647 | static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf) |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4648 | { |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4649 | return sprintf(buf, "%d\n", s->remote_node_defrag_ratio / 10); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4650 | } |
| 4651 | |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4652 | static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4653 | const char *buf, size_t length) |
| 4654 | { |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4655 | unsigned long ratio; |
| 4656 | int err; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4657 | |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4658 | err = strict_strtoul(buf, 10, &ratio); |
| 4659 | if (err) |
| 4660 | return err; |
| 4661 | |
Christoph Lameter | e2cb96b | 2008-08-19 08:51:22 -0500 | [diff] [blame] | 4662 | if (ratio <= 100) |
Christoph Lameter | 0121c619 | 2008-04-29 16:11:12 -0700 | [diff] [blame] | 4663 | s->remote_node_defrag_ratio = ratio * 10; |
| 4664 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4665 | return length; |
| 4666 | } |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4667 | SLAB_ATTR(remote_node_defrag_ratio); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4668 | #endif |
| 4669 | |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4670 | #ifdef CONFIG_SLUB_STATS |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4671 | static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) |
| 4672 | { |
| 4673 | unsigned long sum = 0; |
| 4674 | int cpu; |
| 4675 | int len; |
| 4676 | int *data = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL); |
| 4677 | |
| 4678 | if (!data) |
| 4679 | return -ENOMEM; |
| 4680 | |
| 4681 | for_each_online_cpu(cpu) { |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 4682 | unsigned x = per_cpu_ptr(s->cpu_slab, cpu)->stat[si]; |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4683 | |
| 4684 | data[cpu] = x; |
| 4685 | sum += x; |
| 4686 | } |
| 4687 | |
| 4688 | len = sprintf(buf, "%lu", sum); |
| 4689 | |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 4690 | #ifdef CONFIG_SMP |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4691 | for_each_online_cpu(cpu) { |
| 4692 | if (data[cpu] && len < PAGE_SIZE - 20) |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 4693 | len += sprintf(buf + len, " C%d=%u", cpu, data[cpu]); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4694 | } |
Christoph Lameter | 50ef37b | 2008-04-14 18:52:05 +0300 | [diff] [blame] | 4695 | #endif |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4696 | kfree(data); |
| 4697 | return len + sprintf(buf + len, "\n"); |
| 4698 | } |
| 4699 | |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 4700 | static void clear_stat(struct kmem_cache *s, enum stat_item si) |
| 4701 | { |
| 4702 | int cpu; |
| 4703 | |
| 4704 | for_each_online_cpu(cpu) |
Christoph Lameter | 9dfc6e6 | 2009-12-18 16:26:20 -0600 | [diff] [blame] | 4705 | per_cpu_ptr(s->cpu_slab, cpu)->stat[si] = 0; |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 4706 | } |
| 4707 | |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4708 | #define STAT_ATTR(si, text) \ |
| 4709 | static ssize_t text##_show(struct kmem_cache *s, char *buf) \ |
| 4710 | { \ |
| 4711 | return show_stat(s, buf, si); \ |
| 4712 | } \ |
David Rientjes | 78eb00c | 2009-10-15 02:20:22 -0700 | [diff] [blame] | 4713 | static ssize_t text##_store(struct kmem_cache *s, \ |
| 4714 | const char *buf, size_t length) \ |
| 4715 | { \ |
| 4716 | if (buf[0] != '0') \ |
| 4717 | return -EINVAL; \ |
| 4718 | clear_stat(s, si); \ |
| 4719 | return length; \ |
| 4720 | } \ |
| 4721 | SLAB_ATTR(text); \ |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4722 | |
| 4723 | STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath); |
| 4724 | STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath); |
| 4725 | STAT_ATTR(FREE_FASTPATH, free_fastpath); |
| 4726 | STAT_ATTR(FREE_SLOWPATH, free_slowpath); |
| 4727 | STAT_ATTR(FREE_FROZEN, free_frozen); |
| 4728 | STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial); |
| 4729 | STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial); |
| 4730 | STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial); |
| 4731 | STAT_ATTR(ALLOC_SLAB, alloc_slab); |
| 4732 | STAT_ATTR(ALLOC_REFILL, alloc_refill); |
Christoph Lameter | e36a265 | 2011-06-01 12:25:57 -0500 | [diff] [blame] | 4733 | STAT_ATTR(ALLOC_NODE_MISMATCH, alloc_node_mismatch); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4734 | STAT_ATTR(FREE_SLAB, free_slab); |
| 4735 | STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush); |
| 4736 | STAT_ATTR(DEACTIVATE_FULL, deactivate_full); |
| 4737 | STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty); |
| 4738 | STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head); |
| 4739 | STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail); |
| 4740 | STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees); |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 4741 | STAT_ATTR(DEACTIVATE_BYPASS, deactivate_bypass); |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4742 | STAT_ATTR(ORDER_FALLBACK, order_fallback); |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4743 | STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail); |
| 4744 | STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail); |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4745 | #endif |
| 4746 | |
Pekka Enberg | 0642878 | 2008-01-07 23:20:27 -0800 | [diff] [blame] | 4747 | static struct attribute *slab_attrs[] = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4748 | &slab_size_attr.attr, |
| 4749 | &object_size_attr.attr, |
| 4750 | &objs_per_slab_attr.attr, |
| 4751 | &order_attr.attr, |
David Rientjes | 73d342b | 2009-02-22 17:40:09 -0800 | [diff] [blame] | 4752 | &min_partial_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4753 | &objects_attr.attr, |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4754 | &objects_partial_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4755 | &partial_attr.attr, |
| 4756 | &cpu_slabs_attr.attr, |
| 4757 | &ctor_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4758 | &aliases_attr.attr, |
| 4759 | &align_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4760 | &hwcache_align_attr.attr, |
| 4761 | &reclaim_account_attr.attr, |
| 4762 | &destroy_by_rcu_attr.attr, |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4763 | &shrink_attr.attr, |
Lai Jiangshan | ab9a0f1 | 2011-03-10 15:21:48 +0800 | [diff] [blame] | 4764 | &reserved_attr.attr, |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4765 | #ifdef CONFIG_SLUB_DEBUG |
Christoph Lameter | a5a8475 | 2010-10-05 13:57:27 -0500 | [diff] [blame] | 4766 | &total_objects_attr.attr, |
| 4767 | &slabs_attr.attr, |
| 4768 | &sanity_checks_attr.attr, |
| 4769 | &trace_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4770 | &red_zone_attr.attr, |
| 4771 | &poison_attr.attr, |
| 4772 | &store_user_attr.attr, |
Christoph Lameter | 53e15af | 2007-05-06 14:49:43 -0700 | [diff] [blame] | 4773 | &validate_attr.attr, |
Christoph Lameter | 88a420e | 2007-05-06 14:49:45 -0700 | [diff] [blame] | 4774 | &alloc_calls_attr.attr, |
| 4775 | &free_calls_attr.attr, |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 4776 | #endif |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4777 | #ifdef CONFIG_ZONE_DMA |
| 4778 | &cache_dma_attr.attr, |
| 4779 | #endif |
| 4780 | #ifdef CONFIG_NUMA |
Christoph Lameter | 9824601 | 2008-01-07 23:20:26 -0800 | [diff] [blame] | 4781 | &remote_node_defrag_ratio_attr.attr, |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4782 | #endif |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4783 | #ifdef CONFIG_SLUB_STATS |
| 4784 | &alloc_fastpath_attr.attr, |
| 4785 | &alloc_slowpath_attr.attr, |
| 4786 | &free_fastpath_attr.attr, |
| 4787 | &free_slowpath_attr.attr, |
| 4788 | &free_frozen_attr.attr, |
| 4789 | &free_add_partial_attr.attr, |
| 4790 | &free_remove_partial_attr.attr, |
| 4791 | &alloc_from_partial_attr.attr, |
| 4792 | &alloc_slab_attr.attr, |
| 4793 | &alloc_refill_attr.attr, |
Christoph Lameter | e36a265 | 2011-06-01 12:25:57 -0500 | [diff] [blame] | 4794 | &alloc_node_mismatch_attr.attr, |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4795 | &free_slab_attr.attr, |
| 4796 | &cpuslab_flush_attr.attr, |
| 4797 | &deactivate_full_attr.attr, |
| 4798 | &deactivate_empty_attr.attr, |
| 4799 | &deactivate_to_head_attr.attr, |
| 4800 | &deactivate_to_tail_attr.attr, |
| 4801 | &deactivate_remote_frees_attr.attr, |
Christoph Lameter | 03e404a | 2011-06-01 12:25:58 -0500 | [diff] [blame] | 4802 | &deactivate_bypass_attr.attr, |
Christoph Lameter | 65c3376 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 4803 | &order_fallback_attr.attr, |
Christoph Lameter | b789ef5 | 2011-06-01 12:25:49 -0500 | [diff] [blame] | 4804 | &cmpxchg_double_fail_attr.attr, |
| 4805 | &cmpxchg_double_cpu_fail_attr.attr, |
Christoph Lameter | 8ff12cf | 2008-02-07 17:47:41 -0800 | [diff] [blame] | 4806 | #endif |
Dmitry Monakhov | 4c13dd3 | 2010-02-26 09:36:12 +0300 | [diff] [blame] | 4807 | #ifdef CONFIG_FAILSLAB |
| 4808 | &failslab_attr.attr, |
| 4809 | #endif |
| 4810 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4811 | NULL |
| 4812 | }; |
| 4813 | |
| 4814 | static struct attribute_group slab_attr_group = { |
| 4815 | .attrs = slab_attrs, |
| 4816 | }; |
| 4817 | |
| 4818 | static ssize_t slab_attr_show(struct kobject *kobj, |
| 4819 | struct attribute *attr, |
| 4820 | char *buf) |
| 4821 | { |
| 4822 | struct slab_attribute *attribute; |
| 4823 | struct kmem_cache *s; |
| 4824 | int err; |
| 4825 | |
| 4826 | attribute = to_slab_attr(attr); |
| 4827 | s = to_slab(kobj); |
| 4828 | |
| 4829 | if (!attribute->show) |
| 4830 | return -EIO; |
| 4831 | |
| 4832 | err = attribute->show(s, buf); |
| 4833 | |
| 4834 | return err; |
| 4835 | } |
| 4836 | |
| 4837 | static ssize_t slab_attr_store(struct kobject *kobj, |
| 4838 | struct attribute *attr, |
| 4839 | const char *buf, size_t len) |
| 4840 | { |
| 4841 | struct slab_attribute *attribute; |
| 4842 | struct kmem_cache *s; |
| 4843 | int err; |
| 4844 | |
| 4845 | attribute = to_slab_attr(attr); |
| 4846 | s = to_slab(kobj); |
| 4847 | |
| 4848 | if (!attribute->store) |
| 4849 | return -EIO; |
| 4850 | |
| 4851 | err = attribute->store(s, buf, len); |
| 4852 | |
| 4853 | return err; |
| 4854 | } |
| 4855 | |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 4856 | static void kmem_cache_release(struct kobject *kobj) |
| 4857 | { |
| 4858 | struct kmem_cache *s = to_slab(kobj); |
| 4859 | |
Pekka Enberg | 84c1cf6 | 2010-09-14 23:21:12 +0300 | [diff] [blame] | 4860 | kfree(s->name); |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 4861 | kfree(s); |
| 4862 | } |
| 4863 | |
Emese Revfy | 52cf25d | 2010-01-19 02:58:23 +0100 | [diff] [blame] | 4864 | static const struct sysfs_ops slab_sysfs_ops = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4865 | .show = slab_attr_show, |
| 4866 | .store = slab_attr_store, |
| 4867 | }; |
| 4868 | |
| 4869 | static struct kobj_type slab_ktype = { |
| 4870 | .sysfs_ops = &slab_sysfs_ops, |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 4871 | .release = kmem_cache_release |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4872 | }; |
| 4873 | |
| 4874 | static int uevent_filter(struct kset *kset, struct kobject *kobj) |
| 4875 | { |
| 4876 | struct kobj_type *ktype = get_ktype(kobj); |
| 4877 | |
| 4878 | if (ktype == &slab_ktype) |
| 4879 | return 1; |
| 4880 | return 0; |
| 4881 | } |
| 4882 | |
Emese Revfy | 9cd4361 | 2009-12-31 14:52:51 +0100 | [diff] [blame] | 4883 | static const struct kset_uevent_ops slab_uevent_ops = { |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4884 | .filter = uevent_filter, |
| 4885 | }; |
| 4886 | |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 4887 | static struct kset *slab_kset; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4888 | |
| 4889 | #define ID_STR_LENGTH 64 |
| 4890 | |
| 4891 | /* Create a unique string id for a slab cache: |
Christoph Lameter | 6446faa | 2008-02-15 23:45:26 -0800 | [diff] [blame] | 4892 | * |
| 4893 | * Format :[flags-]size |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4894 | */ |
| 4895 | static char *create_unique_id(struct kmem_cache *s) |
| 4896 | { |
| 4897 | char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL); |
| 4898 | char *p = name; |
| 4899 | |
| 4900 | BUG_ON(!name); |
| 4901 | |
| 4902 | *p++ = ':'; |
| 4903 | /* |
| 4904 | * First flags affecting slabcache operations. We will only |
| 4905 | * get here for aliasable slabs so we do not need to support |
| 4906 | * too many flags. The flags here must cover all flags that |
| 4907 | * are matched during merging to guarantee that the id is |
| 4908 | * unique. |
| 4909 | */ |
| 4910 | if (s->flags & SLAB_CACHE_DMA) |
| 4911 | *p++ = 'd'; |
| 4912 | if (s->flags & SLAB_RECLAIM_ACCOUNT) |
| 4913 | *p++ = 'a'; |
| 4914 | if (s->flags & SLAB_DEBUG_FREE) |
| 4915 | *p++ = 'F'; |
Vegard Nossum | 5a896d9 | 2008-04-04 00:54:48 +0200 | [diff] [blame] | 4916 | if (!(s->flags & SLAB_NOTRACK)) |
| 4917 | *p++ = 't'; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4918 | if (p != name + 1) |
| 4919 | *p++ = '-'; |
| 4920 | p += sprintf(p, "%07d", s->size); |
| 4921 | BUG_ON(p > name + ID_STR_LENGTH - 1); |
| 4922 | return name; |
| 4923 | } |
| 4924 | |
| 4925 | static int sysfs_slab_add(struct kmem_cache *s) |
| 4926 | { |
| 4927 | int err; |
| 4928 | const char *name; |
| 4929 | int unmergeable; |
| 4930 | |
| 4931 | if (slab_state < SYSFS) |
| 4932 | /* Defer until later */ |
| 4933 | return 0; |
| 4934 | |
| 4935 | unmergeable = slab_unmergeable(s); |
| 4936 | if (unmergeable) { |
| 4937 | /* |
| 4938 | * Slabcache can never be merged so we can use the name proper. |
| 4939 | * This is typically the case for debug situations. In that |
| 4940 | * case we can catch duplicate names easily. |
| 4941 | */ |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 4942 | sysfs_remove_link(&slab_kset->kobj, s->name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4943 | name = s->name; |
| 4944 | } else { |
| 4945 | /* |
| 4946 | * Create a unique name for the slab as a target |
| 4947 | * for the symlinks. |
| 4948 | */ |
| 4949 | name = create_unique_id(s); |
| 4950 | } |
| 4951 | |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 4952 | s->kobj.kset = slab_kset; |
Greg Kroah-Hartman | 1eada11 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 4953 | err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, name); |
| 4954 | if (err) { |
| 4955 | kobject_put(&s->kobj); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4956 | return err; |
Greg Kroah-Hartman | 1eada11 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 4957 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4958 | |
| 4959 | err = sysfs_create_group(&s->kobj, &slab_attr_group); |
Xiaotian Feng | 5788d8a | 2009-07-22 11:28:53 +0800 | [diff] [blame] | 4960 | if (err) { |
| 4961 | kobject_del(&s->kobj); |
| 4962 | kobject_put(&s->kobj); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4963 | return err; |
Xiaotian Feng | 5788d8a | 2009-07-22 11:28:53 +0800 | [diff] [blame] | 4964 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4965 | kobject_uevent(&s->kobj, KOBJ_ADD); |
| 4966 | if (!unmergeable) { |
| 4967 | /* Setup first alias */ |
| 4968 | sysfs_slab_alias(s, s->name); |
| 4969 | kfree(name); |
| 4970 | } |
| 4971 | return 0; |
| 4972 | } |
| 4973 | |
| 4974 | static void sysfs_slab_remove(struct kmem_cache *s) |
| 4975 | { |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 4976 | if (slab_state < SYSFS) |
| 4977 | /* |
| 4978 | * Sysfs has not been setup yet so no need to remove the |
| 4979 | * cache from sysfs. |
| 4980 | */ |
| 4981 | return; |
| 4982 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4983 | kobject_uevent(&s->kobj, KOBJ_REMOVE); |
| 4984 | kobject_del(&s->kobj); |
Christoph Lameter | 151c602 | 2008-01-07 22:29:05 -0800 | [diff] [blame] | 4985 | kobject_put(&s->kobj); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4986 | } |
| 4987 | |
| 4988 | /* |
| 4989 | * Need to buffer aliases during bootup until sysfs becomes |
Nick Andrew | 9f6c708e | 2008-12-05 14:08:08 +1100 | [diff] [blame] | 4990 | * available lest we lose that information. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4991 | */ |
| 4992 | struct saved_alias { |
| 4993 | struct kmem_cache *s; |
| 4994 | const char *name; |
| 4995 | struct saved_alias *next; |
| 4996 | }; |
| 4997 | |
Adrian Bunk | 5af328a | 2007-07-17 04:03:27 -0700 | [diff] [blame] | 4998 | static struct saved_alias *alias_list; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 4999 | |
| 5000 | static int sysfs_slab_alias(struct kmem_cache *s, const char *name) |
| 5001 | { |
| 5002 | struct saved_alias *al; |
| 5003 | |
| 5004 | if (slab_state == SYSFS) { |
| 5005 | /* |
| 5006 | * If we have a leftover link then remove it. |
| 5007 | */ |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 5008 | sysfs_remove_link(&slab_kset->kobj, name); |
| 5009 | return sysfs_create_link(&slab_kset->kobj, &s->kobj, name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5010 | } |
| 5011 | |
| 5012 | al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL); |
| 5013 | if (!al) |
| 5014 | return -ENOMEM; |
| 5015 | |
| 5016 | al->s = s; |
| 5017 | al->name = name; |
| 5018 | al->next = alias_list; |
| 5019 | alias_list = al; |
| 5020 | return 0; |
| 5021 | } |
| 5022 | |
| 5023 | static int __init slab_sysfs_init(void) |
| 5024 | { |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 5025 | struct kmem_cache *s; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5026 | int err; |
| 5027 | |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 5028 | down_write(&slub_lock); |
| 5029 | |
Greg Kroah-Hartman | 0ff21e4 | 2007-11-06 10:36:58 -0800 | [diff] [blame] | 5030 | slab_kset = kset_create_and_add("slab", &slab_uevent_ops, kernel_kobj); |
Greg Kroah-Hartman | 27c3a31 | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 5031 | if (!slab_kset) { |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 5032 | up_write(&slub_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5033 | printk(KERN_ERR "Cannot register slab subsystem.\n"); |
| 5034 | return -ENOSYS; |
| 5035 | } |
| 5036 | |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5037 | slab_state = SYSFS; |
| 5038 | |
Christoph Lameter | 5b95a4a | 2007-07-17 04:03:19 -0700 | [diff] [blame] | 5039 | list_for_each_entry(s, &slab_caches, list) { |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5040 | err = sysfs_slab_add(s); |
Christoph Lameter | 5d540fb | 2007-08-30 23:56:26 -0700 | [diff] [blame] | 5041 | if (err) |
| 5042 | printk(KERN_ERR "SLUB: Unable to add boot slab %s" |
| 5043 | " to sysfs\n", s->name); |
Christoph Lameter | 26a7bd0 | 2007-05-09 02:32:39 -0700 | [diff] [blame] | 5044 | } |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5045 | |
| 5046 | while (alias_list) { |
| 5047 | struct saved_alias *al = alias_list; |
| 5048 | |
| 5049 | alias_list = alias_list->next; |
| 5050 | err = sysfs_slab_alias(al->s, al->name); |
Christoph Lameter | 5d540fb | 2007-08-30 23:56:26 -0700 | [diff] [blame] | 5051 | if (err) |
| 5052 | printk(KERN_ERR "SLUB: Unable to add boot slab alias" |
| 5053 | " %s to sysfs\n", s->name); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5054 | kfree(al); |
| 5055 | } |
| 5056 | |
Christoph Lameter | 2bce648 | 2010-07-19 11:39:11 -0500 | [diff] [blame] | 5057 | up_write(&slub_lock); |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 5058 | resiliency_test(); |
| 5059 | return 0; |
| 5060 | } |
| 5061 | |
| 5062 | __initcall(slab_sysfs_init); |
Christoph Lameter | ab4d5ed | 2010-10-05 13:57:26 -0500 | [diff] [blame] | 5063 | #endif /* CONFIG_SYSFS */ |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5064 | |
| 5065 | /* |
| 5066 | * The /proc/slabinfo ABI |
| 5067 | */ |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 5068 | #ifdef CONFIG_SLABINFO |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5069 | static void print_slabinfo_header(struct seq_file *m) |
| 5070 | { |
| 5071 | seq_puts(m, "slabinfo - version: 2.1\n"); |
| 5072 | seq_puts(m, "# name <active_objs> <num_objs> <objsize> " |
| 5073 | "<objperslab> <pagesperslab>"); |
| 5074 | seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>"); |
| 5075 | seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>"); |
| 5076 | seq_putc(m, '\n'); |
| 5077 | } |
| 5078 | |
| 5079 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 5080 | { |
| 5081 | loff_t n = *pos; |
| 5082 | |
| 5083 | down_read(&slub_lock); |
| 5084 | if (!n) |
| 5085 | print_slabinfo_header(m); |
| 5086 | |
| 5087 | return seq_list_start(&slab_caches, *pos); |
| 5088 | } |
| 5089 | |
| 5090 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) |
| 5091 | { |
| 5092 | return seq_list_next(p, &slab_caches, pos); |
| 5093 | } |
| 5094 | |
| 5095 | static void s_stop(struct seq_file *m, void *p) |
| 5096 | { |
| 5097 | up_read(&slub_lock); |
| 5098 | } |
| 5099 | |
| 5100 | static int s_show(struct seq_file *m, void *p) |
| 5101 | { |
| 5102 | unsigned long nr_partials = 0; |
| 5103 | unsigned long nr_slabs = 0; |
| 5104 | unsigned long nr_inuse = 0; |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5105 | unsigned long nr_objs = 0; |
| 5106 | unsigned long nr_free = 0; |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5107 | struct kmem_cache *s; |
| 5108 | int node; |
| 5109 | |
| 5110 | s = list_entry(p, struct kmem_cache, list); |
| 5111 | |
| 5112 | for_each_online_node(node) { |
| 5113 | struct kmem_cache_node *n = get_node(s, node); |
| 5114 | |
| 5115 | if (!n) |
| 5116 | continue; |
| 5117 | |
| 5118 | nr_partials += n->nr_partial; |
| 5119 | nr_slabs += atomic_long_read(&n->nr_slabs); |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5120 | nr_objs += atomic_long_read(&n->total_objects); |
| 5121 | nr_free += count_partial(n, count_free); |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5122 | } |
| 5123 | |
Christoph Lameter | 205ab99 | 2008-04-14 19:11:40 +0300 | [diff] [blame] | 5124 | nr_inuse = nr_objs - nr_free; |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5125 | |
| 5126 | seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", s->name, nr_inuse, |
Christoph Lameter | 834f3d1 | 2008-04-14 19:11:31 +0300 | [diff] [blame] | 5127 | nr_objs, s->size, oo_objects(s->oo), |
| 5128 | (1 << oo_order(s->oo))); |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5129 | seq_printf(m, " : tunables %4u %4u %4u", 0, 0, 0); |
| 5130 | seq_printf(m, " : slabdata %6lu %6lu %6lu", nr_slabs, nr_slabs, |
| 5131 | 0UL); |
| 5132 | seq_putc(m, '\n'); |
| 5133 | return 0; |
| 5134 | } |
| 5135 | |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5136 | static const struct seq_operations slabinfo_op = { |
Pekka J Enberg | 57ed3ed | 2008-01-01 17:23:28 +0100 | [diff] [blame] | 5137 | .start = s_start, |
| 5138 | .next = s_next, |
| 5139 | .stop = s_stop, |
| 5140 | .show = s_show, |
| 5141 | }; |
| 5142 | |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5143 | static int slabinfo_open(struct inode *inode, struct file *file) |
| 5144 | { |
| 5145 | return seq_open(file, &slabinfo_op); |
| 5146 | } |
| 5147 | |
| 5148 | static const struct file_operations proc_slabinfo_operations = { |
| 5149 | .open = slabinfo_open, |
| 5150 | .read = seq_read, |
| 5151 | .llseek = seq_lseek, |
| 5152 | .release = seq_release, |
| 5153 | }; |
| 5154 | |
| 5155 | static int __init slab_proc_init(void) |
| 5156 | { |
WANG Cong | cf5d113 | 2009-08-18 19:11:40 +0300 | [diff] [blame] | 5157 | proc_create("slabinfo", S_IRUGO, NULL, &proc_slabinfo_operations); |
Alexey Dobriyan | 7b3c3a5 | 2008-10-06 02:42:17 +0400 | [diff] [blame] | 5158 | return 0; |
| 5159 | } |
| 5160 | module_init(slab_proc_init); |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 5161 | #endif /* CONFIG_SLABINFO */ |