Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic hugetlb support. |
| 3 | * (C) William Irwin, April 2004 |
| 4 | */ |
| 5 | #include <linux/gfp.h> |
| 6 | #include <linux/list.h> |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/mm.h> |
Alexey Dobriyan | e1759c2 | 2008-10-15 23:50:22 +0400 | [diff] [blame] | 10 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/sysctl.h> |
| 12 | #include <linux/highmem.h> |
Andrea Arcangeli | cddb8a5 | 2008-07-28 15:46:29 -0700 | [diff] [blame] | 13 | #include <linux/mmu_notifier.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/nodemask.h> |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 15 | #include <linux/pagemap.h> |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 16 | #include <linux/mempolicy.h> |
Christoph Lameter | aea47ff | 2006-01-08 01:00:57 -0800 | [diff] [blame] | 17 | #include <linux/cpuset.h> |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 18 | #include <linux/mutex.h> |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 19 | #include <linux/bootmem.h> |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 20 | #include <linux/sysfs.h> |
Linus Torvalds | d660668 | 2008-08-06 12:04:54 -0700 | [diff] [blame] | 21 | |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 22 | #include <asm/page.h> |
| 23 | #include <asm/pgtable.h> |
Adrian Bunk | 78a34ae | 2008-07-28 15:46:30 -0700 | [diff] [blame] | 24 | #include <asm/io.h> |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 25 | |
| 26 | #include <linux/hugetlb.h> |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 27 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL; |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 30 | static gfp_t htlb_alloc_mask = GFP_HIGHUSER; |
| 31 | unsigned long hugepages_treat_as_movable; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 32 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 33 | static int max_hstate; |
| 34 | unsigned int default_hstate_idx; |
| 35 | struct hstate hstates[HUGE_MAX_HSTATE]; |
| 36 | |
Jon Tollefson | 53ba51d | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 37 | __initdata LIST_HEAD(huge_boot_pages); |
| 38 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 39 | /* for command line parsing */ |
| 40 | static struct hstate * __initdata parsed_hstate; |
| 41 | static unsigned long __initdata default_hstate_max_huge_pages; |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 42 | static unsigned long __initdata default_hstate_size; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 43 | |
| 44 | #define for_each_hstate(h) \ |
| 45 | for ((h) = hstates; (h) < &hstates[max_hstate]; (h)++) |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 46 | |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 47 | /* |
| 48 | * Protects updates to hugepage_freelists, nr_huge_pages, and free_huge_pages |
| 49 | */ |
| 50 | static DEFINE_SPINLOCK(hugetlb_lock); |
Eric Paris | 0bd0f9f | 2005-11-21 21:32:28 -0800 | [diff] [blame] | 51 | |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 52 | /* |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 53 | * Region tracking -- allows tracking of reservations and instantiated pages |
| 54 | * across the pages in a mapping. |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 55 | * |
| 56 | * The region data structures are protected by a combination of the mmap_sem |
| 57 | * and the hugetlb_instantion_mutex. To access or modify a region the caller |
| 58 | * must either hold the mmap_sem for write, or the mmap_sem for read and |
| 59 | * the hugetlb_instantiation mutex: |
| 60 | * |
| 61 | * down_write(&mm->mmap_sem); |
| 62 | * or |
| 63 | * down_read(&mm->mmap_sem); |
| 64 | * mutex_lock(&hugetlb_instantiation_mutex); |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 65 | */ |
| 66 | struct file_region { |
| 67 | struct list_head link; |
| 68 | long from; |
| 69 | long to; |
| 70 | }; |
| 71 | |
| 72 | static long region_add(struct list_head *head, long f, long t) |
| 73 | { |
| 74 | struct file_region *rg, *nrg, *trg; |
| 75 | |
| 76 | /* Locate the region we are either in or before. */ |
| 77 | list_for_each_entry(rg, head, link) |
| 78 | if (f <= rg->to) |
| 79 | break; |
| 80 | |
| 81 | /* Round our left edge to the current segment if it encloses us. */ |
| 82 | if (f > rg->from) |
| 83 | f = rg->from; |
| 84 | |
| 85 | /* Check for and consume any regions we now overlap with. */ |
| 86 | nrg = rg; |
| 87 | list_for_each_entry_safe(rg, trg, rg->link.prev, link) { |
| 88 | if (&rg->link == head) |
| 89 | break; |
| 90 | if (rg->from > t) |
| 91 | break; |
| 92 | |
| 93 | /* If this area reaches higher then extend our area to |
| 94 | * include it completely. If this is not the first area |
| 95 | * which we intend to reuse, free it. */ |
| 96 | if (rg->to > t) |
| 97 | t = rg->to; |
| 98 | if (rg != nrg) { |
| 99 | list_del(&rg->link); |
| 100 | kfree(rg); |
| 101 | } |
| 102 | } |
| 103 | nrg->from = f; |
| 104 | nrg->to = t; |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static long region_chg(struct list_head *head, long f, long t) |
| 109 | { |
| 110 | struct file_region *rg, *nrg; |
| 111 | long chg = 0; |
| 112 | |
| 113 | /* Locate the region we are before or in. */ |
| 114 | list_for_each_entry(rg, head, link) |
| 115 | if (f <= rg->to) |
| 116 | break; |
| 117 | |
| 118 | /* If we are below the current region then a new region is required. |
| 119 | * Subtle, allocate a new region at the position but make it zero |
| 120 | * size such that we can guarantee to record the reservation. */ |
| 121 | if (&rg->link == head || t < rg->from) { |
| 122 | nrg = kmalloc(sizeof(*nrg), GFP_KERNEL); |
| 123 | if (!nrg) |
| 124 | return -ENOMEM; |
| 125 | nrg->from = f; |
| 126 | nrg->to = f; |
| 127 | INIT_LIST_HEAD(&nrg->link); |
| 128 | list_add(&nrg->link, rg->link.prev); |
| 129 | |
| 130 | return t - f; |
| 131 | } |
| 132 | |
| 133 | /* Round our left edge to the current segment if it encloses us. */ |
| 134 | if (f > rg->from) |
| 135 | f = rg->from; |
| 136 | chg = t - f; |
| 137 | |
| 138 | /* Check for and consume any regions we now overlap with. */ |
| 139 | list_for_each_entry(rg, rg->link.prev, link) { |
| 140 | if (&rg->link == head) |
| 141 | break; |
| 142 | if (rg->from > t) |
| 143 | return chg; |
| 144 | |
| 145 | /* We overlap with this area, if it extends futher than |
| 146 | * us then we must extend ourselves. Account for its |
| 147 | * existing reservation. */ |
| 148 | if (rg->to > t) { |
| 149 | chg += rg->to - t; |
| 150 | t = rg->to; |
| 151 | } |
| 152 | chg -= rg->to - rg->from; |
| 153 | } |
| 154 | return chg; |
| 155 | } |
| 156 | |
| 157 | static long region_truncate(struct list_head *head, long end) |
| 158 | { |
| 159 | struct file_region *rg, *trg; |
| 160 | long chg = 0; |
| 161 | |
| 162 | /* Locate the region we are either in or before. */ |
| 163 | list_for_each_entry(rg, head, link) |
| 164 | if (end <= rg->to) |
| 165 | break; |
| 166 | if (&rg->link == head) |
| 167 | return 0; |
| 168 | |
| 169 | /* If we are in the middle of a region then adjust it. */ |
| 170 | if (end > rg->from) { |
| 171 | chg = rg->to - end; |
| 172 | rg->to = end; |
| 173 | rg = list_entry(rg->link.next, typeof(*rg), link); |
| 174 | } |
| 175 | |
| 176 | /* Drop any remaining regions. */ |
| 177 | list_for_each_entry_safe(rg, trg, rg->link.prev, link) { |
| 178 | if (&rg->link == head) |
| 179 | break; |
| 180 | chg += rg->to - rg->from; |
| 181 | list_del(&rg->link); |
| 182 | kfree(rg); |
| 183 | } |
| 184 | return chg; |
| 185 | } |
| 186 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 187 | static long region_count(struct list_head *head, long f, long t) |
| 188 | { |
| 189 | struct file_region *rg; |
| 190 | long chg = 0; |
| 191 | |
| 192 | /* Locate each segment we overlap with, and count that overlap. */ |
| 193 | list_for_each_entry(rg, head, link) { |
| 194 | int seg_from; |
| 195 | int seg_to; |
| 196 | |
| 197 | if (rg->to <= f) |
| 198 | continue; |
| 199 | if (rg->from >= t) |
| 200 | break; |
| 201 | |
| 202 | seg_from = max(rg->from, f); |
| 203 | seg_to = min(rg->to, t); |
| 204 | |
| 205 | chg += seg_to - seg_from; |
| 206 | } |
| 207 | |
| 208 | return chg; |
| 209 | } |
| 210 | |
Andy Whitcroft | 9682290 | 2008-07-23 21:27:29 -0700 | [diff] [blame] | 211 | /* |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 212 | * Convert the address within this vma to the page offset within |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 213 | * the mapping, in pagecache page units; huge pages here. |
| 214 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 215 | static pgoff_t vma_hugecache_offset(struct hstate *h, |
| 216 | struct vm_area_struct *vma, unsigned long address) |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 217 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 218 | return ((address - vma->vm_start) >> huge_page_shift(h)) + |
| 219 | (vma->vm_pgoff >> huge_page_order(h)); |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 220 | } |
| 221 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 222 | /* |
Mel Gorman | 08fba69 | 2009-01-06 14:38:53 -0800 | [diff] [blame] | 223 | * Return the size of the pages allocated when backing a VMA. In the majority |
| 224 | * cases this will be same size as used by the page table entries. |
| 225 | */ |
| 226 | unsigned long vma_kernel_pagesize(struct vm_area_struct *vma) |
| 227 | { |
| 228 | struct hstate *hstate; |
| 229 | |
| 230 | if (!is_vm_hugetlb_page(vma)) |
| 231 | return PAGE_SIZE; |
| 232 | |
| 233 | hstate = hstate_vma(vma); |
| 234 | |
| 235 | return 1UL << (hstate->order + PAGE_SHIFT); |
| 236 | } |
Joerg Roedel | f340ca0 | 2009-06-19 15:16:22 +0200 | [diff] [blame] | 237 | EXPORT_SYMBOL_GPL(vma_kernel_pagesize); |
Mel Gorman | 08fba69 | 2009-01-06 14:38:53 -0800 | [diff] [blame] | 238 | |
| 239 | /* |
Mel Gorman | 3340289 | 2009-01-06 14:38:54 -0800 | [diff] [blame] | 240 | * Return the page size being used by the MMU to back a VMA. In the majority |
| 241 | * of cases, the page size used by the kernel matches the MMU size. On |
| 242 | * architectures where it differs, an architecture-specific version of this |
| 243 | * function is required. |
| 244 | */ |
| 245 | #ifndef vma_mmu_pagesize |
| 246 | unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) |
| 247 | { |
| 248 | return vma_kernel_pagesize(vma); |
| 249 | } |
| 250 | #endif |
| 251 | |
| 252 | /* |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 253 | * Flags for MAP_PRIVATE reservations. These are stored in the bottom |
| 254 | * bits of the reservation map pointer, which are always clear due to |
| 255 | * alignment. |
| 256 | */ |
| 257 | #define HPAGE_RESV_OWNER (1UL << 0) |
| 258 | #define HPAGE_RESV_UNMAPPED (1UL << 1) |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 259 | #define HPAGE_RESV_MASK (HPAGE_RESV_OWNER | HPAGE_RESV_UNMAPPED) |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 260 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 261 | /* |
| 262 | * These helpers are used to track how many pages are reserved for |
| 263 | * faults in a MAP_PRIVATE mapping. Only the process that called mmap() |
| 264 | * is guaranteed to have their future faults succeed. |
| 265 | * |
| 266 | * With the exception of reset_vma_resv_huge_pages() which is called at fork(), |
| 267 | * the reserve counters are updated with the hugetlb_lock held. It is safe |
| 268 | * to reset the VMA at fork() time as it is not in use yet and there is no |
| 269 | * chance of the global counters getting corrupted as a result of the values. |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 270 | * |
| 271 | * The private mapping reservation is represented in a subtly different |
| 272 | * manner to a shared mapping. A shared mapping has a region map associated |
| 273 | * with the underlying file, this region map represents the backing file |
| 274 | * pages which have ever had a reservation assigned which this persists even |
| 275 | * after the page is instantiated. A private mapping has a region map |
| 276 | * associated with the original mmap which is attached to all VMAs which |
| 277 | * reference it, this region map represents those offsets which have consumed |
| 278 | * reservation ie. where pages have been instantiated. |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 279 | */ |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 280 | static unsigned long get_vma_private_data(struct vm_area_struct *vma) |
| 281 | { |
| 282 | return (unsigned long)vma->vm_private_data; |
| 283 | } |
| 284 | |
| 285 | static void set_vma_private_data(struct vm_area_struct *vma, |
| 286 | unsigned long value) |
| 287 | { |
| 288 | vma->vm_private_data = (void *)value; |
| 289 | } |
| 290 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 291 | struct resv_map { |
| 292 | struct kref refs; |
| 293 | struct list_head regions; |
| 294 | }; |
| 295 | |
Harvey Harrison | 2a4b3de | 2008-10-18 20:27:06 -0700 | [diff] [blame] | 296 | static struct resv_map *resv_map_alloc(void) |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 297 | { |
| 298 | struct resv_map *resv_map = kmalloc(sizeof(*resv_map), GFP_KERNEL); |
| 299 | if (!resv_map) |
| 300 | return NULL; |
| 301 | |
| 302 | kref_init(&resv_map->refs); |
| 303 | INIT_LIST_HEAD(&resv_map->regions); |
| 304 | |
| 305 | return resv_map; |
| 306 | } |
| 307 | |
Harvey Harrison | 2a4b3de | 2008-10-18 20:27:06 -0700 | [diff] [blame] | 308 | static void resv_map_release(struct kref *ref) |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 309 | { |
| 310 | struct resv_map *resv_map = container_of(ref, struct resv_map, refs); |
| 311 | |
| 312 | /* Clear out any active regions before we release the map. */ |
| 313 | region_truncate(&resv_map->regions, 0); |
| 314 | kfree(resv_map); |
| 315 | } |
| 316 | |
| 317 | static struct resv_map *vma_resv_map(struct vm_area_struct *vma) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 318 | { |
| 319 | VM_BUG_ON(!is_vm_hugetlb_page(vma)); |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 320 | if (!(vma->vm_flags & VM_MAYSHARE)) |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 321 | return (struct resv_map *)(get_vma_private_data(vma) & |
| 322 | ~HPAGE_RESV_MASK); |
Harvey Harrison | 2a4b3de | 2008-10-18 20:27:06 -0700 | [diff] [blame] | 323 | return NULL; |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 324 | } |
| 325 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 326 | static void set_vma_resv_map(struct vm_area_struct *vma, struct resv_map *map) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 327 | { |
| 328 | VM_BUG_ON(!is_vm_hugetlb_page(vma)); |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 329 | VM_BUG_ON(vma->vm_flags & VM_MAYSHARE); |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 330 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 331 | set_vma_private_data(vma, (get_vma_private_data(vma) & |
| 332 | HPAGE_RESV_MASK) | (unsigned long)map); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 333 | } |
| 334 | |
| 335 | static void set_vma_resv_flags(struct vm_area_struct *vma, unsigned long flags) |
| 336 | { |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 337 | VM_BUG_ON(!is_vm_hugetlb_page(vma)); |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 338 | VM_BUG_ON(vma->vm_flags & VM_MAYSHARE); |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 339 | |
| 340 | set_vma_private_data(vma, get_vma_private_data(vma) | flags); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 341 | } |
| 342 | |
| 343 | static int is_vma_resv_set(struct vm_area_struct *vma, unsigned long flag) |
| 344 | { |
| 345 | VM_BUG_ON(!is_vm_hugetlb_page(vma)); |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 346 | |
| 347 | return (get_vma_private_data(vma) & flag) != 0; |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | /* Decrement the reserved pages in the hugepage pool by one */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 351 | static void decrement_hugepage_resv_vma(struct hstate *h, |
| 352 | struct vm_area_struct *vma) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 353 | { |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 354 | if (vma->vm_flags & VM_NORESERVE) |
| 355 | return; |
| 356 | |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 357 | if (vma->vm_flags & VM_MAYSHARE) { |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 358 | /* Shared mappings always use reserves */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 359 | h->resv_huge_pages--; |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 360 | } else if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) { |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 361 | /* |
| 362 | * Only the process that called mmap() has reserves for |
| 363 | * private mappings. |
| 364 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 365 | h->resv_huge_pages--; |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 366 | } |
| 367 | } |
| 368 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 369 | /* Reset counters to 0 and clear all HPAGE_RESV_* flags */ |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 370 | void reset_vma_resv_huge_pages(struct vm_area_struct *vma) |
| 371 | { |
| 372 | VM_BUG_ON(!is_vm_hugetlb_page(vma)); |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 373 | if (!(vma->vm_flags & VM_MAYSHARE)) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 374 | vma->vm_private_data = (void *)0; |
| 375 | } |
| 376 | |
| 377 | /* Returns true if the VMA has associated reserve pages */ |
Mel Gorman | 7f09ca5 | 2008-07-23 21:27:58 -0700 | [diff] [blame] | 378 | static int vma_has_reserves(struct vm_area_struct *vma) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 379 | { |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 380 | if (vma->vm_flags & VM_MAYSHARE) |
Mel Gorman | 7f09ca5 | 2008-07-23 21:27:58 -0700 | [diff] [blame] | 381 | return 1; |
| 382 | if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) |
| 383 | return 1; |
| 384 | return 0; |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 385 | } |
| 386 | |
Andy Whitcroft | 69d177c | 2008-11-06 12:53:26 -0800 | [diff] [blame] | 387 | static void clear_gigantic_page(struct page *page, |
| 388 | unsigned long addr, unsigned long sz) |
| 389 | { |
| 390 | int i; |
| 391 | struct page *p = page; |
| 392 | |
| 393 | might_sleep(); |
| 394 | for (i = 0; i < sz/PAGE_SIZE; i++, p = mem_map_next(p, page, i)) { |
| 395 | cond_resched(); |
| 396 | clear_user_highpage(p, addr + i * PAGE_SIZE); |
| 397 | } |
| 398 | } |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 399 | static void clear_huge_page(struct page *page, |
| 400 | unsigned long addr, unsigned long sz) |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 401 | { |
| 402 | int i; |
| 403 | |
Hannes Eder | ebdd4ae | 2009-01-06 14:39:58 -0800 | [diff] [blame] | 404 | if (unlikely(sz > MAX_ORDER_NR_PAGES)) { |
| 405 | clear_gigantic_page(page, addr, sz); |
| 406 | return; |
| 407 | } |
Andy Whitcroft | 69d177c | 2008-11-06 12:53:26 -0800 | [diff] [blame] | 408 | |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 409 | might_sleep(); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 410 | for (i = 0; i < sz/PAGE_SIZE; i++) { |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 411 | cond_resched(); |
Ralf Baechle | 281e0e3 | 2007-10-01 01:20:10 -0700 | [diff] [blame] | 412 | clear_user_highpage(page + i, addr + i * PAGE_SIZE); |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 413 | } |
| 414 | } |
| 415 | |
Andy Whitcroft | 69d177c | 2008-11-06 12:53:26 -0800 | [diff] [blame] | 416 | static void copy_gigantic_page(struct page *dst, struct page *src, |
| 417 | unsigned long addr, struct vm_area_struct *vma) |
| 418 | { |
| 419 | int i; |
| 420 | struct hstate *h = hstate_vma(vma); |
| 421 | struct page *dst_base = dst; |
| 422 | struct page *src_base = src; |
| 423 | might_sleep(); |
| 424 | for (i = 0; i < pages_per_huge_page(h); ) { |
| 425 | cond_resched(); |
| 426 | copy_user_highpage(dst, src, addr + i*PAGE_SIZE, vma); |
| 427 | |
| 428 | i++; |
| 429 | dst = mem_map_next(dst, dst_base, i); |
| 430 | src = mem_map_next(src, src_base, i); |
| 431 | } |
| 432 | } |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 433 | static void copy_huge_page(struct page *dst, struct page *src, |
Atsushi Nemoto | 9de455b | 2006-12-12 17:14:55 +0000 | [diff] [blame] | 434 | unsigned long addr, struct vm_area_struct *vma) |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 435 | { |
| 436 | int i; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 437 | struct hstate *h = hstate_vma(vma); |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 438 | |
Hannes Eder | ebdd4ae | 2009-01-06 14:39:58 -0800 | [diff] [blame] | 439 | if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES)) { |
| 440 | copy_gigantic_page(dst, src, addr, vma); |
| 441 | return; |
| 442 | } |
Andy Whitcroft | 69d177c | 2008-11-06 12:53:26 -0800 | [diff] [blame] | 443 | |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 444 | might_sleep(); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 445 | for (i = 0; i < pages_per_huge_page(h); i++) { |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 446 | cond_resched(); |
Atsushi Nemoto | 9de455b | 2006-12-12 17:14:55 +0000 | [diff] [blame] | 447 | copy_user_highpage(dst + i, src + i, addr + i*PAGE_SIZE, vma); |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 448 | } |
| 449 | } |
| 450 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 451 | static void enqueue_huge_page(struct hstate *h, struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
| 453 | int nid = page_to_nid(page); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 454 | list_add(&page->lru, &h->hugepage_freelists[nid]); |
| 455 | h->free_huge_pages++; |
| 456 | h->free_huge_pages_node[nid]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
| 458 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 459 | static struct page *dequeue_huge_page_vma(struct hstate *h, |
| 460 | struct vm_area_struct *vma, |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 461 | unsigned long address, int avoid_reserve) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | { |
Nishanth Aravamudan | 31a5c6e | 2007-07-15 23:38:02 -0700 | [diff] [blame] | 463 | int nid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | struct page *page = NULL; |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 465 | struct mempolicy *mpol; |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 466 | nodemask_t *nodemask; |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 467 | struct zonelist *zonelist = huge_zonelist(vma, address, |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 468 | htlb_alloc_mask, &mpol, &nodemask); |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 469 | struct zone *zone; |
| 470 | struct zoneref *z; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 472 | /* |
| 473 | * A child process with MAP_PRIVATE mappings created by their parent |
| 474 | * have no page reserves. This check ensures that reservations are |
| 475 | * not "stolen". The child may still get SIGKILLed |
| 476 | */ |
Mel Gorman | 7f09ca5 | 2008-07-23 21:27:58 -0700 | [diff] [blame] | 477 | if (!vma_has_reserves(vma) && |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 478 | h->free_huge_pages - h->resv_huge_pages == 0) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 479 | return NULL; |
| 480 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 481 | /* If reserves cannot be used, ensure enough pages are in the pool */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 482 | if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0) |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 483 | return NULL; |
| 484 | |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 485 | for_each_zone_zonelist_nodemask(zone, z, zonelist, |
| 486 | MAX_NR_ZONES - 1, nodemask) { |
Mel Gorman | 54a6eb5 | 2008-04-28 02:12:16 -0700 | [diff] [blame] | 487 | nid = zone_to_nid(zone); |
| 488 | if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask) && |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 489 | !list_empty(&h->hugepage_freelists[nid])) { |
| 490 | page = list_entry(h->hugepage_freelists[nid].next, |
Andrew Morton | 3abf7af | 2007-07-19 01:49:08 -0700 | [diff] [blame] | 491 | struct page, lru); |
| 492 | list_del(&page->lru); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 493 | h->free_huge_pages--; |
| 494 | h->free_huge_pages_node[nid]--; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 495 | |
| 496 | if (!avoid_reserve) |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 497 | decrement_hugepage_resv_vma(h, vma); |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 498 | |
Ken Chen | 5ab3ee7 | 2007-07-23 18:44:00 -0700 | [diff] [blame] | 499 | break; |
Andrew Morton | 3abf7af | 2007-07-19 01:49:08 -0700 | [diff] [blame] | 500 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | } |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 502 | mpol_cond_put(mpol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | return page; |
| 504 | } |
| 505 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 506 | static void update_and_free_page(struct hstate *h, struct page *page) |
Adam Litke | 6af2acb | 2007-10-16 01:26:16 -0700 | [diff] [blame] | 507 | { |
| 508 | int i; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 509 | |
Andy Whitcroft | 18229df | 2008-11-06 12:53:27 -0800 | [diff] [blame] | 510 | VM_BUG_ON(h->order >= MAX_ORDER); |
| 511 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 512 | h->nr_huge_pages--; |
| 513 | h->nr_huge_pages_node[page_to_nid(page)]--; |
| 514 | for (i = 0; i < pages_per_huge_page(h); i++) { |
Adam Litke | 6af2acb | 2007-10-16 01:26:16 -0700 | [diff] [blame] | 515 | page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced | |
| 516 | 1 << PG_dirty | 1 << PG_active | 1 << PG_reserved | |
| 517 | 1 << PG_private | 1<< PG_writeback); |
| 518 | } |
| 519 | set_compound_page_dtor(page, NULL); |
| 520 | set_page_refcounted(page); |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 521 | arch_release_hugepage(page); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 522 | __free_pages(page, huge_page_order(h)); |
Adam Litke | 6af2acb | 2007-10-16 01:26:16 -0700 | [diff] [blame] | 523 | } |
| 524 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 525 | struct hstate *size_to_hstate(unsigned long size) |
| 526 | { |
| 527 | struct hstate *h; |
| 528 | |
| 529 | for_each_hstate(h) { |
| 530 | if (huge_page_size(h) == size) |
| 531 | return h; |
| 532 | } |
| 533 | return NULL; |
| 534 | } |
| 535 | |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 536 | static void free_huge_page(struct page *page) |
| 537 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 538 | /* |
| 539 | * Can't pass hstate in here because it is called from the |
| 540 | * compound page destructor. |
| 541 | */ |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 542 | struct hstate *h = page_hstate(page); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 543 | int nid = page_to_nid(page); |
Adam Litke | c79fb75 | 2007-11-14 16:59:38 -0800 | [diff] [blame] | 544 | struct address_space *mapping; |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 545 | |
Adam Litke | c79fb75 | 2007-11-14 16:59:38 -0800 | [diff] [blame] | 546 | mapping = (struct address_space *) page_private(page); |
Andy Whitcroft | e5df70a | 2008-02-23 15:23:32 -0800 | [diff] [blame] | 547 | set_page_private(page, 0); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 548 | BUG_ON(page_count(page)); |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 549 | INIT_LIST_HEAD(&page->lru); |
| 550 | |
| 551 | spin_lock(&hugetlb_lock); |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 552 | if (h->surplus_huge_pages_node[nid] && huge_page_order(h) < MAX_ORDER) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 553 | update_and_free_page(h, page); |
| 554 | h->surplus_huge_pages--; |
| 555 | h->surplus_huge_pages_node[nid]--; |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 556 | } else { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 557 | enqueue_huge_page(h, page); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 558 | } |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 559 | spin_unlock(&hugetlb_lock); |
Adam Litke | c79fb75 | 2007-11-14 16:59:38 -0800 | [diff] [blame] | 560 | if (mapping) |
Adam Litke | 9a119c0 | 2007-11-14 16:59:41 -0800 | [diff] [blame] | 561 | hugetlb_put_quota(mapping, 1); |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 562 | } |
| 563 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 564 | static void prep_new_huge_page(struct hstate *h, struct page *page, int nid) |
Andi Kleen | b7ba30c | 2008-07-23 21:27:40 -0700 | [diff] [blame] | 565 | { |
| 566 | set_compound_page_dtor(page, free_huge_page); |
| 567 | spin_lock(&hugetlb_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 568 | h->nr_huge_pages++; |
| 569 | h->nr_huge_pages_node[nid]++; |
Andi Kleen | b7ba30c | 2008-07-23 21:27:40 -0700 | [diff] [blame] | 570 | spin_unlock(&hugetlb_lock); |
| 571 | put_page(page); /* free it into the hugepage allocator */ |
| 572 | } |
| 573 | |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 574 | static void prep_compound_gigantic_page(struct page *page, unsigned long order) |
| 575 | { |
| 576 | int i; |
| 577 | int nr_pages = 1 << order; |
| 578 | struct page *p = page + 1; |
| 579 | |
| 580 | /* we rely on prep_new_huge_page to set the destructor */ |
| 581 | set_compound_order(page, order); |
| 582 | __SetPageHead(page); |
| 583 | for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) { |
| 584 | __SetPageTail(p); |
| 585 | p->first_page = page; |
| 586 | } |
| 587 | } |
| 588 | |
| 589 | int PageHuge(struct page *page) |
| 590 | { |
| 591 | compound_page_dtor *dtor; |
| 592 | |
| 593 | if (!PageCompound(page)) |
| 594 | return 0; |
| 595 | |
| 596 | page = compound_head(page); |
| 597 | dtor = get_compound_page_dtor(page); |
| 598 | |
| 599 | return dtor == free_huge_page; |
| 600 | } |
| 601 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 602 | static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | struct page *page; |
Joe Jin | f96efd5 | 2007-07-15 23:38:12 -0700 | [diff] [blame] | 605 | |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 606 | if (h->order >= MAX_ORDER) |
| 607 | return NULL; |
| 608 | |
Mel Gorman | 6484eb3 | 2009-06-16 15:31:54 -0700 | [diff] [blame] | 609 | page = alloc_pages_exact_node(nid, |
Nishanth Aravamudan | 551883a | 2008-04-29 00:58:26 -0700 | [diff] [blame] | 610 | htlb_alloc_mask|__GFP_COMP|__GFP_THISNODE| |
| 611 | __GFP_REPEAT|__GFP_NOWARN, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 612 | huge_page_order(h)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | if (page) { |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 614 | if (arch_prepare_hugepage(page)) { |
Gerald Schaefer | caff3a2 | 2008-08-12 15:08:38 -0700 | [diff] [blame] | 615 | __free_pages(page, huge_page_order(h)); |
Harvey Harrison | 7b8ee84 | 2008-04-28 14:13:19 -0700 | [diff] [blame] | 616 | return NULL; |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 617 | } |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 618 | prep_new_huge_page(h, page, nid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
Nishanth Aravamudan | 63b4613 | 2007-10-16 01:26:24 -0700 | [diff] [blame] | 620 | |
| 621 | return page; |
| 622 | } |
| 623 | |
Andi Kleen | 5ced66c | 2008-07-23 21:27:45 -0700 | [diff] [blame] | 624 | /* |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 625 | * common helper function for hstate_next_node_to_{alloc|free}. |
| 626 | * return next node in node_online_map, wrapping at end. |
| 627 | */ |
| 628 | static int next_node_allowed(int nid) |
| 629 | { |
| 630 | nid = next_node(nid, node_online_map); |
| 631 | if (nid == MAX_NUMNODES) |
| 632 | nid = first_node(node_online_map); |
| 633 | VM_BUG_ON(nid >= MAX_NUMNODES); |
| 634 | |
| 635 | return nid; |
| 636 | } |
| 637 | |
| 638 | /* |
Andi Kleen | 5ced66c | 2008-07-23 21:27:45 -0700 | [diff] [blame] | 639 | * Use a helper variable to find the next node and then |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 640 | * copy it back to next_nid_to_alloc afterwards: |
Andi Kleen | 5ced66c | 2008-07-23 21:27:45 -0700 | [diff] [blame] | 641 | * otherwise there's a window in which a racer might |
Mel Gorman | 6484eb3 | 2009-06-16 15:31:54 -0700 | [diff] [blame] | 642 | * pass invalid nid MAX_NUMNODES to alloc_pages_exact_node. |
Andi Kleen | 5ced66c | 2008-07-23 21:27:45 -0700 | [diff] [blame] | 643 | * But we don't need to use a spin_lock here: it really |
| 644 | * doesn't matter if occasionally a racer chooses the |
| 645 | * same nid as we do. Move nid forward in the mask even |
| 646 | * if we just successfully allocated a hugepage so that |
| 647 | * the next caller gets hugepages on the next node. |
| 648 | */ |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 649 | static int hstate_next_node_to_alloc(struct hstate *h) |
Andi Kleen | 5ced66c | 2008-07-23 21:27:45 -0700 | [diff] [blame] | 650 | { |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 651 | int nid, next_nid; |
| 652 | |
| 653 | nid = h->next_nid_to_alloc; |
| 654 | next_nid = next_node_allowed(nid); |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 655 | h->next_nid_to_alloc = next_nid; |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 656 | return nid; |
Andi Kleen | 5ced66c | 2008-07-23 21:27:45 -0700 | [diff] [blame] | 657 | } |
| 658 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 659 | static int alloc_fresh_huge_page(struct hstate *h) |
Nishanth Aravamudan | 63b4613 | 2007-10-16 01:26:24 -0700 | [diff] [blame] | 660 | { |
| 661 | struct page *page; |
| 662 | int start_nid; |
| 663 | int next_nid; |
| 664 | int ret = 0; |
| 665 | |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 666 | start_nid = hstate_next_node_to_alloc(h); |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 667 | next_nid = start_nid; |
Nishanth Aravamudan | 63b4613 | 2007-10-16 01:26:24 -0700 | [diff] [blame] | 668 | |
| 669 | do { |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 670 | page = alloc_fresh_huge_page_node(h, next_nid); |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 671 | if (page) { |
Nishanth Aravamudan | 63b4613 | 2007-10-16 01:26:24 -0700 | [diff] [blame] | 672 | ret = 1; |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 673 | break; |
| 674 | } |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 675 | next_nid = hstate_next_node_to_alloc(h); |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 676 | } while (next_nid != start_nid); |
Nishanth Aravamudan | 63b4613 | 2007-10-16 01:26:24 -0700 | [diff] [blame] | 677 | |
Adam Litke | 3b11630 | 2008-04-28 02:13:06 -0700 | [diff] [blame] | 678 | if (ret) |
| 679 | count_vm_event(HTLB_BUDDY_PGALLOC); |
| 680 | else |
| 681 | count_vm_event(HTLB_BUDDY_PGALLOC_FAIL); |
| 682 | |
Nishanth Aravamudan | 63b4613 | 2007-10-16 01:26:24 -0700 | [diff] [blame] | 683 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | } |
| 685 | |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 686 | /* |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 687 | * helper for free_pool_huge_page() - return the next node |
| 688 | * from which to free a huge page. Advance the next node id |
| 689 | * whether or not we find a free huge page to free so that the |
| 690 | * next attempt to free addresses the next node. |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 691 | */ |
| 692 | static int hstate_next_node_to_free(struct hstate *h) |
| 693 | { |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 694 | int nid, next_nid; |
| 695 | |
| 696 | nid = h->next_nid_to_free; |
| 697 | next_nid = next_node_allowed(nid); |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 698 | h->next_nid_to_free = next_nid; |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 699 | return nid; |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 700 | } |
| 701 | |
| 702 | /* |
| 703 | * Free huge page from pool from next node to free. |
| 704 | * Attempt to keep persistent huge pages more or less |
| 705 | * balanced over allowed nodes. |
| 706 | * Called with hugetlb_lock locked. |
| 707 | */ |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 708 | static int free_pool_huge_page(struct hstate *h, bool acct_surplus) |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 709 | { |
| 710 | int start_nid; |
| 711 | int next_nid; |
| 712 | int ret = 0; |
| 713 | |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 714 | start_nid = hstate_next_node_to_free(h); |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 715 | next_nid = start_nid; |
| 716 | |
| 717 | do { |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 718 | /* |
| 719 | * If we're returning unused surplus pages, only examine |
| 720 | * nodes with surplus pages. |
| 721 | */ |
| 722 | if ((!acct_surplus || h->surplus_huge_pages_node[next_nid]) && |
| 723 | !list_empty(&h->hugepage_freelists[next_nid])) { |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 724 | struct page *page = |
| 725 | list_entry(h->hugepage_freelists[next_nid].next, |
| 726 | struct page, lru); |
| 727 | list_del(&page->lru); |
| 728 | h->free_huge_pages--; |
| 729 | h->free_huge_pages_node[next_nid]--; |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 730 | if (acct_surplus) { |
| 731 | h->surplus_huge_pages--; |
| 732 | h->surplus_huge_pages_node[next_nid]--; |
| 733 | } |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 734 | update_and_free_page(h, page); |
| 735 | ret = 1; |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 736 | break; |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 737 | } |
| 738 | next_nid = hstate_next_node_to_free(h); |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 739 | } while (next_nid != start_nid); |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 740 | |
| 741 | return ret; |
| 742 | } |
| 743 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 744 | static struct page *alloc_buddy_huge_page(struct hstate *h, |
| 745 | struct vm_area_struct *vma, unsigned long address) |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 746 | { |
| 747 | struct page *page; |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 748 | unsigned int nid; |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 749 | |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 750 | if (h->order >= MAX_ORDER) |
| 751 | return NULL; |
| 752 | |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 753 | /* |
| 754 | * Assume we will successfully allocate the surplus page to |
| 755 | * prevent racing processes from causing the surplus to exceed |
| 756 | * overcommit |
| 757 | * |
| 758 | * This however introduces a different race, where a process B |
| 759 | * tries to grow the static hugepage pool while alloc_pages() is |
| 760 | * called by process A. B will only examine the per-node |
| 761 | * counters in determining if surplus huge pages can be |
| 762 | * converted to normal huge pages in adjust_pool_surplus(). A |
| 763 | * won't be able to increment the per-node counter, until the |
| 764 | * lock is dropped by B, but B doesn't drop hugetlb_lock until |
| 765 | * no more huge pages can be converted from surplus to normal |
| 766 | * state (and doesn't try to convert again). Thus, we have a |
| 767 | * case where a surplus huge page exists, the pool is grown, and |
| 768 | * the surplus huge page still exists after, even though it |
| 769 | * should just have been converted to a normal huge page. This |
| 770 | * does not leak memory, though, as the hugepage will be freed |
| 771 | * once it is out of use. It also does not allow the counters to |
| 772 | * go out of whack in adjust_pool_surplus() as we don't modify |
| 773 | * the node values until we've gotten the hugepage and only the |
| 774 | * per-node value is checked there. |
| 775 | */ |
| 776 | spin_lock(&hugetlb_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 777 | if (h->surplus_huge_pages >= h->nr_overcommit_huge_pages) { |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 778 | spin_unlock(&hugetlb_lock); |
| 779 | return NULL; |
| 780 | } else { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 781 | h->nr_huge_pages++; |
| 782 | h->surplus_huge_pages++; |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 783 | } |
| 784 | spin_unlock(&hugetlb_lock); |
| 785 | |
Nishanth Aravamudan | 551883a | 2008-04-29 00:58:26 -0700 | [diff] [blame] | 786 | page = alloc_pages(htlb_alloc_mask|__GFP_COMP| |
| 787 | __GFP_REPEAT|__GFP_NOWARN, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 788 | huge_page_order(h)); |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 789 | |
Gerald Schaefer | caff3a2 | 2008-08-12 15:08:38 -0700 | [diff] [blame] | 790 | if (page && arch_prepare_hugepage(page)) { |
| 791 | __free_pages(page, huge_page_order(h)); |
| 792 | return NULL; |
| 793 | } |
| 794 | |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 795 | spin_lock(&hugetlb_lock); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 796 | if (page) { |
Adam Litke | 2668db9 | 2008-03-10 11:43:50 -0700 | [diff] [blame] | 797 | /* |
| 798 | * This page is now managed by the hugetlb allocator and has |
| 799 | * no users -- drop the buddy allocator's reference. |
| 800 | */ |
| 801 | put_page_testzero(page); |
| 802 | VM_BUG_ON(page_count(page)); |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 803 | nid = page_to_nid(page); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 804 | set_compound_page_dtor(page, free_huge_page); |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 805 | /* |
| 806 | * We incremented the global counters already |
| 807 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 808 | h->nr_huge_pages_node[nid]++; |
| 809 | h->surplus_huge_pages_node[nid]++; |
Adam Litke | 3b11630 | 2008-04-28 02:13:06 -0700 | [diff] [blame] | 810 | __count_vm_event(HTLB_BUDDY_PGALLOC); |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 811 | } else { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 812 | h->nr_huge_pages--; |
| 813 | h->surplus_huge_pages--; |
Adam Litke | 3b11630 | 2008-04-28 02:13:06 -0700 | [diff] [blame] | 814 | __count_vm_event(HTLB_BUDDY_PGALLOC_FAIL); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 815 | } |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 816 | spin_unlock(&hugetlb_lock); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 817 | |
| 818 | return page; |
| 819 | } |
| 820 | |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 821 | /* |
| 822 | * Increase the hugetlb pool such that it can accomodate a reservation |
| 823 | * of size 'delta'. |
| 824 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 825 | static int gather_surplus_pages(struct hstate *h, int delta) |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 826 | { |
| 827 | struct list_head surplus_list; |
| 828 | struct page *page, *tmp; |
| 829 | int ret, i; |
| 830 | int needed, allocated; |
| 831 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 832 | needed = (h->resv_huge_pages + delta) - h->free_huge_pages; |
Adam Litke | ac09b3a | 2008-03-04 14:29:38 -0800 | [diff] [blame] | 833 | if (needed <= 0) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 834 | h->resv_huge_pages += delta; |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 835 | return 0; |
Adam Litke | ac09b3a | 2008-03-04 14:29:38 -0800 | [diff] [blame] | 836 | } |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 837 | |
| 838 | allocated = 0; |
| 839 | INIT_LIST_HEAD(&surplus_list); |
| 840 | |
| 841 | ret = -ENOMEM; |
| 842 | retry: |
| 843 | spin_unlock(&hugetlb_lock); |
| 844 | for (i = 0; i < needed; i++) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 845 | page = alloc_buddy_huge_page(h, NULL, 0); |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 846 | if (!page) { |
| 847 | /* |
| 848 | * We were not able to allocate enough pages to |
| 849 | * satisfy the entire reservation so we free what |
| 850 | * we've allocated so far. |
| 851 | */ |
| 852 | spin_lock(&hugetlb_lock); |
| 853 | needed = 0; |
| 854 | goto free; |
| 855 | } |
| 856 | |
| 857 | list_add(&page->lru, &surplus_list); |
| 858 | } |
| 859 | allocated += needed; |
| 860 | |
| 861 | /* |
| 862 | * After retaking hugetlb_lock, we need to recalculate 'needed' |
| 863 | * because either resv_huge_pages or free_huge_pages may have changed. |
| 864 | */ |
| 865 | spin_lock(&hugetlb_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 866 | needed = (h->resv_huge_pages + delta) - |
| 867 | (h->free_huge_pages + allocated); |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 868 | if (needed > 0) |
| 869 | goto retry; |
| 870 | |
| 871 | /* |
| 872 | * The surplus_list now contains _at_least_ the number of extra pages |
| 873 | * needed to accomodate the reservation. Add the appropriate number |
| 874 | * of pages to the hugetlb pool and free the extras back to the buddy |
Adam Litke | ac09b3a | 2008-03-04 14:29:38 -0800 | [diff] [blame] | 875 | * allocator. Commit the entire reservation here to prevent another |
| 876 | * process from stealing the pages as they are added to the pool but |
| 877 | * before they are reserved. |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 878 | */ |
| 879 | needed += allocated; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 880 | h->resv_huge_pages += delta; |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 881 | ret = 0; |
| 882 | free: |
Adam Litke | 19fc3f0 | 2008-04-28 02:12:20 -0700 | [diff] [blame] | 883 | /* Free the needed pages to the hugetlb pool */ |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 884 | list_for_each_entry_safe(page, tmp, &surplus_list, lru) { |
Adam Litke | 19fc3f0 | 2008-04-28 02:12:20 -0700 | [diff] [blame] | 885 | if ((--needed) < 0) |
| 886 | break; |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 887 | list_del(&page->lru); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 888 | enqueue_huge_page(h, page); |
Adam Litke | 19fc3f0 | 2008-04-28 02:12:20 -0700 | [diff] [blame] | 889 | } |
| 890 | |
| 891 | /* Free unnecessary surplus pages to the buddy allocator */ |
| 892 | if (!list_empty(&surplus_list)) { |
| 893 | spin_unlock(&hugetlb_lock); |
| 894 | list_for_each_entry_safe(page, tmp, &surplus_list, lru) { |
| 895 | list_del(&page->lru); |
Adam Litke | af767cb | 2007-10-16 01:26:25 -0700 | [diff] [blame] | 896 | /* |
Adam Litke | 2668db9 | 2008-03-10 11:43:50 -0700 | [diff] [blame] | 897 | * The page has a reference count of zero already, so |
| 898 | * call free_huge_page directly instead of using |
| 899 | * put_page. This must be done with hugetlb_lock |
Adam Litke | af767cb | 2007-10-16 01:26:25 -0700 | [diff] [blame] | 900 | * unlocked which is safe because free_huge_page takes |
| 901 | * hugetlb_lock before deciding how to free the page. |
| 902 | */ |
Adam Litke | 2668db9 | 2008-03-10 11:43:50 -0700 | [diff] [blame] | 903 | free_huge_page(page); |
Adam Litke | af767cb | 2007-10-16 01:26:25 -0700 | [diff] [blame] | 904 | } |
Adam Litke | 19fc3f0 | 2008-04-28 02:12:20 -0700 | [diff] [blame] | 905 | spin_lock(&hugetlb_lock); |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 906 | } |
| 907 | |
| 908 | return ret; |
| 909 | } |
| 910 | |
| 911 | /* |
| 912 | * When releasing a hugetlb pool reservation, any surplus pages that were |
| 913 | * allocated to satisfy the reservation must be explicitly freed if they were |
| 914 | * never used. |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 915 | * Called with hugetlb_lock held. |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 916 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 917 | static void return_unused_surplus_pages(struct hstate *h, |
| 918 | unsigned long unused_resv_pages) |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 919 | { |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 920 | unsigned long nr_pages; |
| 921 | |
Adam Litke | ac09b3a | 2008-03-04 14:29:38 -0800 | [diff] [blame] | 922 | /* Uncommit the reservation */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 923 | h->resv_huge_pages -= unused_resv_pages; |
Adam Litke | ac09b3a | 2008-03-04 14:29:38 -0800 | [diff] [blame] | 924 | |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 925 | /* Cannot return gigantic pages currently */ |
| 926 | if (h->order >= MAX_ORDER) |
| 927 | return; |
| 928 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 929 | nr_pages = min(unused_resv_pages, h->surplus_huge_pages); |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 930 | |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 931 | /* |
| 932 | * We want to release as many surplus pages as possible, spread |
| 933 | * evenly across all nodes. Iterate across all nodes until we |
| 934 | * can no longer free unreserved surplus pages. This occurs when |
| 935 | * the nodes with surplus pages have no free pages. |
| 936 | * free_pool_huge_page() will balance the the frees across the |
| 937 | * on-line nodes for us and will handle the hstate accounting. |
| 938 | */ |
| 939 | while (nr_pages--) { |
| 940 | if (!free_pool_huge_page(h, 1)) |
| 941 | break; |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 942 | } |
| 943 | } |
| 944 | |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 945 | /* |
| 946 | * Determine if the huge page at addr within the vma has an associated |
| 947 | * reservation. Where it does not we will need to logically increase |
| 948 | * reservation and actually increase quota before an allocation can occur. |
| 949 | * Where any new reservation would be required the reservation change is |
| 950 | * prepared, but not committed. Once the page has been quota'd allocated |
| 951 | * an instantiated the change should be committed via vma_commit_reservation. |
| 952 | * No action is required on failure. |
| 953 | */ |
Roel Kluin | e2f17d9 | 2009-03-31 15:23:15 -0700 | [diff] [blame] | 954 | static long vma_needs_reservation(struct hstate *h, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 955 | struct vm_area_struct *vma, unsigned long addr) |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 956 | { |
| 957 | struct address_space *mapping = vma->vm_file->f_mapping; |
| 958 | struct inode *inode = mapping->host; |
| 959 | |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 960 | if (vma->vm_flags & VM_MAYSHARE) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 961 | pgoff_t idx = vma_hugecache_offset(h, vma, addr); |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 962 | return region_chg(&inode->i_mapping->private_list, |
| 963 | idx, idx + 1); |
| 964 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 965 | } else if (!is_vma_resv_set(vma, HPAGE_RESV_OWNER)) { |
| 966 | return 1; |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 967 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 968 | } else { |
Roel Kluin | e2f17d9 | 2009-03-31 15:23:15 -0700 | [diff] [blame] | 969 | long err; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 970 | pgoff_t idx = vma_hugecache_offset(h, vma, addr); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 971 | struct resv_map *reservations = vma_resv_map(vma); |
| 972 | |
| 973 | err = region_chg(&reservations->regions, idx, idx + 1); |
| 974 | if (err < 0) |
| 975 | return err; |
| 976 | return 0; |
| 977 | } |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 978 | } |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 979 | static void vma_commit_reservation(struct hstate *h, |
| 980 | struct vm_area_struct *vma, unsigned long addr) |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 981 | { |
| 982 | struct address_space *mapping = vma->vm_file->f_mapping; |
| 983 | struct inode *inode = mapping->host; |
| 984 | |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 985 | if (vma->vm_flags & VM_MAYSHARE) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 986 | pgoff_t idx = vma_hugecache_offset(h, vma, addr); |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 987 | region_add(&inode->i_mapping->private_list, idx, idx + 1); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 988 | |
| 989 | } else if (is_vma_resv_set(vma, HPAGE_RESV_OWNER)) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 990 | pgoff_t idx = vma_hugecache_offset(h, vma, addr); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 991 | struct resv_map *reservations = vma_resv_map(vma); |
| 992 | |
| 993 | /* Mark this page used in the map. */ |
| 994 | region_add(&reservations->regions, idx, idx + 1); |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 995 | } |
| 996 | } |
| 997 | |
David Gibson | 27a85ef | 2006-03-22 00:08:56 -0800 | [diff] [blame] | 998 | static struct page *alloc_huge_page(struct vm_area_struct *vma, |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 999 | unsigned long addr, int avoid_reserve) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1001 | struct hstate *h = hstate_vma(vma); |
Adam Litke | 348ea20 | 2007-11-14 16:59:37 -0800 | [diff] [blame] | 1002 | struct page *page; |
Adam Litke | 2fc39ce | 2007-11-14 16:59:39 -0800 | [diff] [blame] | 1003 | struct address_space *mapping = vma->vm_file->f_mapping; |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1004 | struct inode *inode = mapping->host; |
Roel Kluin | e2f17d9 | 2009-03-31 15:23:15 -0700 | [diff] [blame] | 1005 | long chg; |
Adam Litke | 2fc39ce | 2007-11-14 16:59:39 -0800 | [diff] [blame] | 1006 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1007 | /* |
| 1008 | * Processes that did not create the mapping will have no reserves and |
| 1009 | * will not have accounted against quota. Check that the quota can be |
| 1010 | * made before satisfying the allocation |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1011 | * MAP_NORESERVE mappings may also need pages and quota allocated |
| 1012 | * if no reserve mapping overlaps. |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1013 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1014 | chg = vma_needs_reservation(h, vma, addr); |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1015 | if (chg < 0) |
| 1016 | return ERR_PTR(chg); |
| 1017 | if (chg) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1018 | if (hugetlb_get_quota(inode->i_mapping, chg)) |
| 1019 | return ERR_PTR(-ENOSPC); |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1020 | |
| 1021 | spin_lock(&hugetlb_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1022 | page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve); |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1023 | spin_unlock(&hugetlb_lock); |
| 1024 | |
| 1025 | if (!page) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1026 | page = alloc_buddy_huge_page(h, vma, addr); |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1027 | if (!page) { |
| 1028 | hugetlb_put_quota(inode->i_mapping, chg); |
| 1029 | return ERR_PTR(-VM_FAULT_OOM); |
| 1030 | } |
| 1031 | } |
| 1032 | |
| 1033 | set_page_refcounted(page); |
| 1034 | set_page_private(page, (unsigned long) mapping); |
| 1035 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1036 | vma_commit_reservation(h, vma, addr); |
Andy Whitcroft | c37f9fb | 2008-07-23 21:27:30 -0700 | [diff] [blame] | 1037 | |
Adam Litke | 90d8b7e | 2007-11-14 16:59:42 -0800 | [diff] [blame] | 1038 | return page; |
David Gibson | b45b5bd | 2006-03-22 00:08:55 -0800 | [diff] [blame] | 1039 | } |
| 1040 | |
Cyrill Gorcunov | 91f4766 | 2009-01-06 14:40:33 -0800 | [diff] [blame] | 1041 | int __weak alloc_bootmem_huge_page(struct hstate *h) |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1042 | { |
| 1043 | struct huge_bootmem_page *m; |
| 1044 | int nr_nodes = nodes_weight(node_online_map); |
| 1045 | |
| 1046 | while (nr_nodes) { |
| 1047 | void *addr; |
| 1048 | |
| 1049 | addr = __alloc_bootmem_node_nopanic( |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 1050 | NODE_DATA(hstate_next_node_to_alloc(h)), |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1051 | huge_page_size(h), huge_page_size(h), 0); |
| 1052 | |
| 1053 | if (addr) { |
| 1054 | /* |
| 1055 | * Use the beginning of the huge page to store the |
| 1056 | * huge_bootmem_page struct (until gather_bootmem |
| 1057 | * puts them into the mem_map). |
| 1058 | */ |
| 1059 | m = addr; |
Cyrill Gorcunov | 91f4766 | 2009-01-06 14:40:33 -0800 | [diff] [blame] | 1060 | goto found; |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1061 | } |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1062 | nr_nodes--; |
| 1063 | } |
| 1064 | return 0; |
| 1065 | |
| 1066 | found: |
| 1067 | BUG_ON((unsigned long)virt_to_phys(m) & (huge_page_size(h) - 1)); |
| 1068 | /* Put them into a private list first because mem_map is not up yet */ |
| 1069 | list_add(&m->list, &huge_boot_pages); |
| 1070 | m->hstate = h; |
| 1071 | return 1; |
| 1072 | } |
| 1073 | |
Andy Whitcroft | 18229df | 2008-11-06 12:53:27 -0800 | [diff] [blame] | 1074 | static void prep_compound_huge_page(struct page *page, int order) |
| 1075 | { |
| 1076 | if (unlikely(order > (MAX_ORDER - 1))) |
| 1077 | prep_compound_gigantic_page(page, order); |
| 1078 | else |
| 1079 | prep_compound_page(page, order); |
| 1080 | } |
| 1081 | |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1082 | /* Put bootmem huge pages into the standard lists after mem_map is up */ |
| 1083 | static void __init gather_bootmem_prealloc(void) |
| 1084 | { |
| 1085 | struct huge_bootmem_page *m; |
| 1086 | |
| 1087 | list_for_each_entry(m, &huge_boot_pages, list) { |
| 1088 | struct page *page = virt_to_page(m); |
| 1089 | struct hstate *h = m->hstate; |
| 1090 | __ClearPageReserved(page); |
| 1091 | WARN_ON(page_count(page) != 1); |
Andy Whitcroft | 18229df | 2008-11-06 12:53:27 -0800 | [diff] [blame] | 1092 | prep_compound_huge_page(page, h->order); |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1093 | prep_new_huge_page(h, page, page_to_nid(page)); |
| 1094 | } |
| 1095 | } |
| 1096 | |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1097 | static void __init hugetlb_hstate_alloc_pages(struct hstate *h) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | { |
| 1099 | unsigned long i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1101 | for (i = 0; i < h->max_huge_pages; ++i) { |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1102 | if (h->order >= MAX_ORDER) { |
| 1103 | if (!alloc_bootmem_huge_page(h)) |
| 1104 | break; |
| 1105 | } else if (!alloc_fresh_huge_page(h)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | } |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1108 | h->max_huge_pages = i; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1109 | } |
| 1110 | |
| 1111 | static void __init hugetlb_init_hstates(void) |
| 1112 | { |
| 1113 | struct hstate *h; |
| 1114 | |
| 1115 | for_each_hstate(h) { |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1116 | /* oversize hugepages were init'ed in early boot */ |
| 1117 | if (h->order < MAX_ORDER) |
| 1118 | hugetlb_hstate_alloc_pages(h); |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1119 | } |
| 1120 | } |
| 1121 | |
Andi Kleen | 4abd32d | 2008-07-23 21:27:49 -0700 | [diff] [blame] | 1122 | static char * __init memfmt(char *buf, unsigned long n) |
| 1123 | { |
| 1124 | if (n >= (1UL << 30)) |
| 1125 | sprintf(buf, "%lu GB", n >> 30); |
| 1126 | else if (n >= (1UL << 20)) |
| 1127 | sprintf(buf, "%lu MB", n >> 20); |
| 1128 | else |
| 1129 | sprintf(buf, "%lu KB", n >> 10); |
| 1130 | return buf; |
| 1131 | } |
| 1132 | |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1133 | static void __init report_hugepages(void) |
| 1134 | { |
| 1135 | struct hstate *h; |
| 1136 | |
| 1137 | for_each_hstate(h) { |
Andi Kleen | 4abd32d | 2008-07-23 21:27:49 -0700 | [diff] [blame] | 1138 | char buf[32]; |
| 1139 | printk(KERN_INFO "HugeTLB registered %s page size, " |
| 1140 | "pre-allocated %ld pages\n", |
| 1141 | memfmt(buf, huge_page_size(h)), |
| 1142 | h->free_huge_pages); |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1143 | } |
| 1144 | } |
| 1145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | #ifdef CONFIG_HIGHMEM |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1147 | static void try_to_free_low(struct hstate *h, unsigned long count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | { |
Christoph Lameter | 4415cc8 | 2006-09-25 23:31:55 -0700 | [diff] [blame] | 1149 | int i; |
| 1150 | |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1151 | if (h->order >= MAX_ORDER) |
| 1152 | return; |
| 1153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | for (i = 0; i < MAX_NUMNODES; ++i) { |
| 1155 | struct page *page, *next; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1156 | struct list_head *freel = &h->hugepage_freelists[i]; |
| 1157 | list_for_each_entry_safe(page, next, freel, lru) { |
| 1158 | if (count >= h->nr_huge_pages) |
Adam Litke | 6b0c880 | 2007-10-16 01:26:23 -0700 | [diff] [blame] | 1159 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | if (PageHighMem(page)) |
| 1161 | continue; |
| 1162 | list_del(&page->lru); |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1163 | update_and_free_page(h, page); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1164 | h->free_huge_pages--; |
| 1165 | h->free_huge_pages_node[page_to_nid(page)]--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | } |
| 1167 | } |
| 1168 | } |
| 1169 | #else |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1170 | static inline void try_to_free_low(struct hstate *h, unsigned long count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | { |
| 1172 | } |
| 1173 | #endif |
| 1174 | |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1175 | /* |
| 1176 | * Increment or decrement surplus_huge_pages. Keep node-specific counters |
| 1177 | * balanced by operating on them in a round-robin fashion. |
| 1178 | * Returns 1 if an adjustment was made. |
| 1179 | */ |
| 1180 | static int adjust_pool_surplus(struct hstate *h, int delta) |
| 1181 | { |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1182 | int start_nid, next_nid; |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1183 | int ret = 0; |
| 1184 | |
| 1185 | VM_BUG_ON(delta != -1 && delta != 1); |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1186 | |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1187 | if (delta < 0) |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 1188 | start_nid = hstate_next_node_to_alloc(h); |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1189 | else |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 1190 | start_nid = hstate_next_node_to_free(h); |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1191 | next_nid = start_nid; |
| 1192 | |
| 1193 | do { |
| 1194 | int nid = next_nid; |
| 1195 | if (delta < 0) { |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1196 | /* |
| 1197 | * To shrink on this node, there must be a surplus page |
| 1198 | */ |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 1199 | if (!h->surplus_huge_pages_node[nid]) { |
| 1200 | next_nid = hstate_next_node_to_alloc(h); |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1201 | continue; |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 1202 | } |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1203 | } |
| 1204 | if (delta > 0) { |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1205 | /* |
| 1206 | * Surplus cannot exceed the total number of pages |
| 1207 | */ |
| 1208 | if (h->surplus_huge_pages_node[nid] >= |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 1209 | h->nr_huge_pages_node[nid]) { |
| 1210 | next_nid = hstate_next_node_to_free(h); |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1211 | continue; |
Lee Schermerhorn | 9a76db0 | 2009-12-14 17:58:15 -0800 | [diff] [blame^] | 1212 | } |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1213 | } |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1214 | |
| 1215 | h->surplus_huge_pages += delta; |
| 1216 | h->surplus_huge_pages_node[nid] += delta; |
| 1217 | ret = 1; |
| 1218 | break; |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1219 | } while (next_nid != start_nid); |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1220 | |
Wu Fengguang | 20a0307 | 2009-06-16 15:32:22 -0700 | [diff] [blame] | 1221 | return ret; |
| 1222 | } |
| 1223 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1224 | #define persistent_huge_pages(h) (h->nr_huge_pages - h->surplus_huge_pages) |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1225 | static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | { |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1227 | unsigned long min_count, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1229 | if (h->order >= MAX_ORDER) |
| 1230 | return h->max_huge_pages; |
| 1231 | |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1232 | /* |
| 1233 | * Increase the pool size |
| 1234 | * First take pages out of surplus state. Then make up the |
| 1235 | * remaining difference by allocating fresh huge pages. |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1236 | * |
| 1237 | * We might race with alloc_buddy_huge_page() here and be unable |
| 1238 | * to convert a surplus huge page to a normal huge page. That is |
| 1239 | * not critical, though, it just means the overall size of the |
| 1240 | * pool might be one hugepage larger than it needs to be, but |
| 1241 | * within all the constraints specified by the sysctls. |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1242 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | spin_lock(&hugetlb_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1244 | while (h->surplus_huge_pages && count > persistent_huge_pages(h)) { |
| 1245 | if (!adjust_pool_surplus(h, -1)) |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1246 | break; |
| 1247 | } |
| 1248 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1249 | while (count > persistent_huge_pages(h)) { |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1250 | /* |
| 1251 | * If this allocation races such that we no longer need the |
| 1252 | * page, free_huge_page will handle it by freeing the page |
| 1253 | * and reducing the surplus. |
| 1254 | */ |
| 1255 | spin_unlock(&hugetlb_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1256 | ret = alloc_fresh_huge_page(h); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1257 | spin_lock(&hugetlb_lock); |
| 1258 | if (!ret) |
| 1259 | goto out; |
| 1260 | |
| 1261 | } |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1262 | |
| 1263 | /* |
| 1264 | * Decrease the pool size |
| 1265 | * First return free pages to the buddy allocator (being careful |
| 1266 | * to keep enough around to satisfy reservations). Then place |
| 1267 | * pages into surplus state as needed so the pool will shrink |
| 1268 | * to the desired size as pages become free. |
Nishanth Aravamudan | d1c3fb1 | 2007-12-17 16:20:12 -0800 | [diff] [blame] | 1269 | * |
| 1270 | * By placing pages into the surplus state independent of the |
| 1271 | * overcommit value, we are allowing the surplus pool size to |
| 1272 | * exceed overcommit. There are few sane options here. Since |
| 1273 | * alloc_buddy_huge_page() is checking the global counter, |
| 1274 | * though, we'll note that we're not allowed to exceed surplus |
| 1275 | * and won't grow the pool anywhere else. Not until one of the |
| 1276 | * sysctls are changed, or the surplus pages go out of use. |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1277 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1278 | min_count = h->resv_huge_pages + h->nr_huge_pages - h->free_huge_pages; |
Adam Litke | 6b0c880 | 2007-10-16 01:26:23 -0700 | [diff] [blame] | 1279 | min_count = max(count, min_count); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1280 | try_to_free_low(h, min_count); |
| 1281 | while (min_count < persistent_huge_pages(h)) { |
Lee Schermerhorn | 685f345 | 2009-09-21 17:01:23 -0700 | [diff] [blame] | 1282 | if (!free_pool_huge_page(h, 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | } |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1285 | while (count < persistent_huge_pages(h)) { |
| 1286 | if (!adjust_pool_surplus(h, 1)) |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1287 | break; |
| 1288 | } |
| 1289 | out: |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1290 | ret = persistent_huge_pages(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | spin_unlock(&hugetlb_lock); |
Adam Litke | 7893d1d | 2007-10-16 01:26:18 -0700 | [diff] [blame] | 1292 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | } |
| 1294 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1295 | #define HSTATE_ATTR_RO(_name) \ |
| 1296 | static struct kobj_attribute _name##_attr = __ATTR_RO(_name) |
| 1297 | |
| 1298 | #define HSTATE_ATTR(_name) \ |
| 1299 | static struct kobj_attribute _name##_attr = \ |
| 1300 | __ATTR(_name, 0644, _name##_show, _name##_store) |
| 1301 | |
| 1302 | static struct kobject *hugepages_kobj; |
| 1303 | static struct kobject *hstate_kobjs[HUGE_MAX_HSTATE]; |
| 1304 | |
| 1305 | static struct hstate *kobj_to_hstate(struct kobject *kobj) |
| 1306 | { |
| 1307 | int i; |
| 1308 | for (i = 0; i < HUGE_MAX_HSTATE; i++) |
| 1309 | if (hstate_kobjs[i] == kobj) |
| 1310 | return &hstates[i]; |
| 1311 | BUG(); |
| 1312 | return NULL; |
| 1313 | } |
| 1314 | |
| 1315 | static ssize_t nr_hugepages_show(struct kobject *kobj, |
| 1316 | struct kobj_attribute *attr, char *buf) |
| 1317 | { |
| 1318 | struct hstate *h = kobj_to_hstate(kobj); |
| 1319 | return sprintf(buf, "%lu\n", h->nr_huge_pages); |
| 1320 | } |
| 1321 | static ssize_t nr_hugepages_store(struct kobject *kobj, |
| 1322 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1323 | { |
| 1324 | int err; |
| 1325 | unsigned long input; |
| 1326 | struct hstate *h = kobj_to_hstate(kobj); |
| 1327 | |
| 1328 | err = strict_strtoul(buf, 10, &input); |
| 1329 | if (err) |
| 1330 | return 0; |
| 1331 | |
| 1332 | h->max_huge_pages = set_max_huge_pages(h, input); |
| 1333 | |
| 1334 | return count; |
| 1335 | } |
| 1336 | HSTATE_ATTR(nr_hugepages); |
| 1337 | |
| 1338 | static ssize_t nr_overcommit_hugepages_show(struct kobject *kobj, |
| 1339 | struct kobj_attribute *attr, char *buf) |
| 1340 | { |
| 1341 | struct hstate *h = kobj_to_hstate(kobj); |
| 1342 | return sprintf(buf, "%lu\n", h->nr_overcommit_huge_pages); |
| 1343 | } |
| 1344 | static ssize_t nr_overcommit_hugepages_store(struct kobject *kobj, |
| 1345 | struct kobj_attribute *attr, const char *buf, size_t count) |
| 1346 | { |
| 1347 | int err; |
| 1348 | unsigned long input; |
| 1349 | struct hstate *h = kobj_to_hstate(kobj); |
| 1350 | |
| 1351 | err = strict_strtoul(buf, 10, &input); |
| 1352 | if (err) |
| 1353 | return 0; |
| 1354 | |
| 1355 | spin_lock(&hugetlb_lock); |
| 1356 | h->nr_overcommit_huge_pages = input; |
| 1357 | spin_unlock(&hugetlb_lock); |
| 1358 | |
| 1359 | return count; |
| 1360 | } |
| 1361 | HSTATE_ATTR(nr_overcommit_hugepages); |
| 1362 | |
| 1363 | static ssize_t free_hugepages_show(struct kobject *kobj, |
| 1364 | struct kobj_attribute *attr, char *buf) |
| 1365 | { |
| 1366 | struct hstate *h = kobj_to_hstate(kobj); |
| 1367 | return sprintf(buf, "%lu\n", h->free_huge_pages); |
| 1368 | } |
| 1369 | HSTATE_ATTR_RO(free_hugepages); |
| 1370 | |
| 1371 | static ssize_t resv_hugepages_show(struct kobject *kobj, |
| 1372 | struct kobj_attribute *attr, char *buf) |
| 1373 | { |
| 1374 | struct hstate *h = kobj_to_hstate(kobj); |
| 1375 | return sprintf(buf, "%lu\n", h->resv_huge_pages); |
| 1376 | } |
| 1377 | HSTATE_ATTR_RO(resv_hugepages); |
| 1378 | |
| 1379 | static ssize_t surplus_hugepages_show(struct kobject *kobj, |
| 1380 | struct kobj_attribute *attr, char *buf) |
| 1381 | { |
| 1382 | struct hstate *h = kobj_to_hstate(kobj); |
| 1383 | return sprintf(buf, "%lu\n", h->surplus_huge_pages); |
| 1384 | } |
| 1385 | HSTATE_ATTR_RO(surplus_hugepages); |
| 1386 | |
| 1387 | static struct attribute *hstate_attrs[] = { |
| 1388 | &nr_hugepages_attr.attr, |
| 1389 | &nr_overcommit_hugepages_attr.attr, |
| 1390 | &free_hugepages_attr.attr, |
| 1391 | &resv_hugepages_attr.attr, |
| 1392 | &surplus_hugepages_attr.attr, |
| 1393 | NULL, |
| 1394 | }; |
| 1395 | |
| 1396 | static struct attribute_group hstate_attr_group = { |
| 1397 | .attrs = hstate_attrs, |
| 1398 | }; |
| 1399 | |
| 1400 | static int __init hugetlb_sysfs_add_hstate(struct hstate *h) |
| 1401 | { |
| 1402 | int retval; |
| 1403 | |
| 1404 | hstate_kobjs[h - hstates] = kobject_create_and_add(h->name, |
| 1405 | hugepages_kobj); |
| 1406 | if (!hstate_kobjs[h - hstates]) |
| 1407 | return -ENOMEM; |
| 1408 | |
| 1409 | retval = sysfs_create_group(hstate_kobjs[h - hstates], |
| 1410 | &hstate_attr_group); |
| 1411 | if (retval) |
| 1412 | kobject_put(hstate_kobjs[h - hstates]); |
| 1413 | |
| 1414 | return retval; |
| 1415 | } |
| 1416 | |
| 1417 | static void __init hugetlb_sysfs_init(void) |
| 1418 | { |
| 1419 | struct hstate *h; |
| 1420 | int err; |
| 1421 | |
| 1422 | hugepages_kobj = kobject_create_and_add("hugepages", mm_kobj); |
| 1423 | if (!hugepages_kobj) |
| 1424 | return; |
| 1425 | |
| 1426 | for_each_hstate(h) { |
| 1427 | err = hugetlb_sysfs_add_hstate(h); |
| 1428 | if (err) |
| 1429 | printk(KERN_ERR "Hugetlb: Unable to add hstate %s", |
| 1430 | h->name); |
| 1431 | } |
| 1432 | } |
| 1433 | |
| 1434 | static void __exit hugetlb_exit(void) |
| 1435 | { |
| 1436 | struct hstate *h; |
| 1437 | |
| 1438 | for_each_hstate(h) { |
| 1439 | kobject_put(hstate_kobjs[h - hstates]); |
| 1440 | } |
| 1441 | |
| 1442 | kobject_put(hugepages_kobj); |
| 1443 | } |
| 1444 | module_exit(hugetlb_exit); |
| 1445 | |
| 1446 | static int __init hugetlb_init(void) |
| 1447 | { |
Benjamin Herrenschmidt | 0ef89d2 | 2008-07-31 00:07:30 -0700 | [diff] [blame] | 1448 | /* Some platform decide whether they support huge pages at boot |
| 1449 | * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when |
| 1450 | * there is no such support |
| 1451 | */ |
| 1452 | if (HPAGE_SHIFT == 0) |
| 1453 | return 0; |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1454 | |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 1455 | if (!size_to_hstate(default_hstate_size)) { |
| 1456 | default_hstate_size = HPAGE_SIZE; |
| 1457 | if (!size_to_hstate(default_hstate_size)) |
| 1458 | hugetlb_add_hstate(HUGETLB_PAGE_ORDER); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1459 | } |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 1460 | default_hstate_idx = size_to_hstate(default_hstate_size) - hstates; |
| 1461 | if (default_hstate_max_huge_pages) |
| 1462 | default_hstate.max_huge_pages = default_hstate_max_huge_pages; |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1463 | |
| 1464 | hugetlb_init_hstates(); |
| 1465 | |
Andi Kleen | aa888a7 | 2008-07-23 21:27:47 -0700 | [diff] [blame] | 1466 | gather_bootmem_prealloc(); |
| 1467 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1468 | report_hugepages(); |
| 1469 | |
| 1470 | hugetlb_sysfs_init(); |
| 1471 | |
| 1472 | return 0; |
| 1473 | } |
| 1474 | module_init(hugetlb_init); |
| 1475 | |
| 1476 | /* Should be called on processing a hugepagesz=... option */ |
| 1477 | void __init hugetlb_add_hstate(unsigned order) |
| 1478 | { |
| 1479 | struct hstate *h; |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1480 | unsigned long i; |
| 1481 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1482 | if (size_to_hstate(PAGE_SIZE << order)) { |
| 1483 | printk(KERN_WARNING "hugepagesz= specified twice, ignoring\n"); |
| 1484 | return; |
| 1485 | } |
| 1486 | BUG_ON(max_hstate >= HUGE_MAX_HSTATE); |
| 1487 | BUG_ON(order == 0); |
| 1488 | h = &hstates[max_hstate++]; |
| 1489 | h->order = order; |
| 1490 | h->mask = ~((1ULL << (order + PAGE_SHIFT)) - 1); |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1491 | h->nr_huge_pages = 0; |
| 1492 | h->free_huge_pages = 0; |
| 1493 | for (i = 0; i < MAX_NUMNODES; ++i) |
| 1494 | INIT_LIST_HEAD(&h->hugepage_freelists[i]); |
Lee Schermerhorn | e8c5c82 | 2009-09-21 17:01:22 -0700 | [diff] [blame] | 1495 | h->next_nid_to_alloc = first_node(node_online_map); |
| 1496 | h->next_nid_to_free = first_node(node_online_map); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1497 | snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB", |
| 1498 | huge_page_size(h)/1024); |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1499 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1500 | parsed_hstate = h; |
| 1501 | } |
| 1502 | |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 1503 | static int __init hugetlb_nrpages_setup(char *s) |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1504 | { |
| 1505 | unsigned long *mhp; |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1506 | static unsigned long *last_mhp; |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1507 | |
| 1508 | /* |
| 1509 | * !max_hstate means we haven't parsed a hugepagesz= parameter yet, |
| 1510 | * so this hugepages= parameter goes to the "default hstate". |
| 1511 | */ |
| 1512 | if (!max_hstate) |
| 1513 | mhp = &default_hstate_max_huge_pages; |
| 1514 | else |
| 1515 | mhp = &parsed_hstate->max_huge_pages; |
| 1516 | |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1517 | if (mhp == last_mhp) { |
| 1518 | printk(KERN_WARNING "hugepages= specified twice without " |
| 1519 | "interleaving hugepagesz=, ignoring\n"); |
| 1520 | return 1; |
| 1521 | } |
| 1522 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1523 | if (sscanf(s, "%lu", mhp) <= 0) |
| 1524 | *mhp = 0; |
| 1525 | |
Andi Kleen | 8faa8b0 | 2008-07-23 21:27:48 -0700 | [diff] [blame] | 1526 | /* |
| 1527 | * Global state is always initialized later in hugetlb_init. |
| 1528 | * But we need to allocate >= MAX_ORDER hstates here early to still |
| 1529 | * use the bootmem allocator. |
| 1530 | */ |
| 1531 | if (max_hstate && parsed_hstate->order >= MAX_ORDER) |
| 1532 | hugetlb_hstate_alloc_pages(parsed_hstate); |
| 1533 | |
| 1534 | last_mhp = mhp; |
| 1535 | |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1536 | return 1; |
| 1537 | } |
Nick Piggin | e11bfbf | 2008-07-23 21:27:52 -0700 | [diff] [blame] | 1538 | __setup("hugepages=", hugetlb_nrpages_setup); |
| 1539 | |
| 1540 | static int __init hugetlb_default_setup(char *s) |
| 1541 | { |
| 1542 | default_hstate_size = memparse(s, &s); |
| 1543 | return 1; |
| 1544 | } |
| 1545 | __setup("default_hugepagesz=", hugetlb_default_setup); |
Nishanth Aravamudan | a343787 | 2008-07-23 21:27:44 -0700 | [diff] [blame] | 1546 | |
Nishanth Aravamudan | 8a21346 | 2008-07-25 19:44:37 -0700 | [diff] [blame] | 1547 | static unsigned int cpuset_mems_nr(unsigned int *array) |
| 1548 | { |
| 1549 | int node; |
| 1550 | unsigned int nr = 0; |
| 1551 | |
| 1552 | for_each_node_mask(node, cpuset_current_mems_allowed) |
| 1553 | nr += array[node]; |
| 1554 | |
| 1555 | return nr; |
| 1556 | } |
| 1557 | |
| 1558 | #ifdef CONFIG_SYSCTL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | int hugetlb_sysctl_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1560 | void __user *buffer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | size_t *length, loff_t *ppos) |
| 1562 | { |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1563 | struct hstate *h = &default_hstate; |
| 1564 | unsigned long tmp; |
| 1565 | |
| 1566 | if (!write) |
| 1567 | tmp = h->max_huge_pages; |
| 1568 | |
| 1569 | table->data = &tmp; |
| 1570 | table->maxlen = sizeof(unsigned long); |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1571 | proc_doulongvec_minmax(table, write, buffer, length, ppos); |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1572 | |
| 1573 | if (write) |
| 1574 | h->max_huge_pages = set_max_huge_pages(h, tmp); |
| 1575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | return 0; |
| 1577 | } |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 1578 | |
| 1579 | int hugetlb_treat_movable_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1580 | void __user *buffer, |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 1581 | size_t *length, loff_t *ppos) |
| 1582 | { |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1583 | proc_dointvec(table, write, buffer, length, ppos); |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 1584 | if (hugepages_treat_as_movable) |
| 1585 | htlb_alloc_mask = GFP_HIGHUSER_MOVABLE; |
| 1586 | else |
| 1587 | htlb_alloc_mask = GFP_HIGHUSER; |
| 1588 | return 0; |
| 1589 | } |
| 1590 | |
Nishanth Aravamudan | a3d0c6a | 2008-02-08 04:18:18 -0800 | [diff] [blame] | 1591 | int hugetlb_overcommit_handler(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1592 | void __user *buffer, |
Nishanth Aravamudan | a3d0c6a | 2008-02-08 04:18:18 -0800 | [diff] [blame] | 1593 | size_t *length, loff_t *ppos) |
| 1594 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1595 | struct hstate *h = &default_hstate; |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1596 | unsigned long tmp; |
| 1597 | |
| 1598 | if (!write) |
| 1599 | tmp = h->nr_overcommit_huge_pages; |
| 1600 | |
| 1601 | table->data = &tmp; |
| 1602 | table->maxlen = sizeof(unsigned long); |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1603 | proc_doulongvec_minmax(table, write, buffer, length, ppos); |
Andi Kleen | e5ff215 | 2008-07-23 21:27:42 -0700 | [diff] [blame] | 1604 | |
| 1605 | if (write) { |
| 1606 | spin_lock(&hugetlb_lock); |
| 1607 | h->nr_overcommit_huge_pages = tmp; |
| 1608 | spin_unlock(&hugetlb_lock); |
| 1609 | } |
| 1610 | |
Nishanth Aravamudan | a3d0c6a | 2008-02-08 04:18:18 -0800 | [diff] [blame] | 1611 | return 0; |
| 1612 | } |
| 1613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | #endif /* CONFIG_SYSCTL */ |
| 1615 | |
Alexey Dobriyan | e1759c2 | 2008-10-15 23:50:22 +0400 | [diff] [blame] | 1616 | void hugetlb_report_meminfo(struct seq_file *m) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1618 | struct hstate *h = &default_hstate; |
Alexey Dobriyan | e1759c2 | 2008-10-15 23:50:22 +0400 | [diff] [blame] | 1619 | seq_printf(m, |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 1620 | "HugePages_Total: %5lu\n" |
| 1621 | "HugePages_Free: %5lu\n" |
| 1622 | "HugePages_Rsvd: %5lu\n" |
| 1623 | "HugePages_Surp: %5lu\n" |
| 1624 | "Hugepagesize: %8lu kB\n", |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1625 | h->nr_huge_pages, |
| 1626 | h->free_huge_pages, |
| 1627 | h->resv_huge_pages, |
| 1628 | h->surplus_huge_pages, |
| 1629 | 1UL << (huge_page_order(h) + PAGE_SHIFT - 10)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | } |
| 1631 | |
| 1632 | int hugetlb_report_node_meminfo(int nid, char *buf) |
| 1633 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1634 | struct hstate *h = &default_hstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | return sprintf(buf, |
| 1636 | "Node %d HugePages_Total: %5u\n" |
Nishanth Aravamudan | a1de091 | 2008-03-26 14:37:53 -0700 | [diff] [blame] | 1637 | "Node %d HugePages_Free: %5u\n" |
| 1638 | "Node %d HugePages_Surp: %5u\n", |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1639 | nid, h->nr_huge_pages_node[nid], |
| 1640 | nid, h->free_huge_pages_node[nid], |
| 1641 | nid, h->surplus_huge_pages_node[nid]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | } |
| 1643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | /* Return the number pages of memory we physically have, in PAGE_SIZE units. */ |
| 1645 | unsigned long hugetlb_total_pages(void) |
| 1646 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1647 | struct hstate *h = &default_hstate; |
| 1648 | return h->nr_huge_pages * pages_per_huge_page(h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1651 | static int hugetlb_acct_memory(struct hstate *h, long delta) |
Mel Gorman | fc1b8a7 | 2008-07-23 21:27:22 -0700 | [diff] [blame] | 1652 | { |
| 1653 | int ret = -ENOMEM; |
| 1654 | |
| 1655 | spin_lock(&hugetlb_lock); |
| 1656 | /* |
| 1657 | * When cpuset is configured, it breaks the strict hugetlb page |
| 1658 | * reservation as the accounting is done on a global variable. Such |
| 1659 | * reservation is completely rubbish in the presence of cpuset because |
| 1660 | * the reservation is not checked against page availability for the |
| 1661 | * current cpuset. Application can still potentially OOM'ed by kernel |
| 1662 | * with lack of free htlb page in cpuset that the task is in. |
| 1663 | * Attempt to enforce strict accounting with cpuset is almost |
| 1664 | * impossible (or too ugly) because cpuset is too fluid that |
| 1665 | * task or memory node can be dynamically moved between cpusets. |
| 1666 | * |
| 1667 | * The change of semantics for shared hugetlb mapping with cpuset is |
| 1668 | * undesirable. However, in order to preserve some of the semantics, |
| 1669 | * we fall back to check against current free page availability as |
| 1670 | * a best attempt and hopefully to minimize the impact of changing |
| 1671 | * semantics that cpuset has. |
| 1672 | */ |
| 1673 | if (delta > 0) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1674 | if (gather_surplus_pages(h, delta) < 0) |
Mel Gorman | fc1b8a7 | 2008-07-23 21:27:22 -0700 | [diff] [blame] | 1675 | goto out; |
| 1676 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1677 | if (delta > cpuset_mems_nr(h->free_huge_pages_node)) { |
| 1678 | return_unused_surplus_pages(h, delta); |
Mel Gorman | fc1b8a7 | 2008-07-23 21:27:22 -0700 | [diff] [blame] | 1679 | goto out; |
| 1680 | } |
| 1681 | } |
| 1682 | |
| 1683 | ret = 0; |
| 1684 | if (delta < 0) |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1685 | return_unused_surplus_pages(h, (unsigned long) -delta); |
Mel Gorman | fc1b8a7 | 2008-07-23 21:27:22 -0700 | [diff] [blame] | 1686 | |
| 1687 | out: |
| 1688 | spin_unlock(&hugetlb_lock); |
| 1689 | return ret; |
| 1690 | } |
| 1691 | |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 1692 | static void hugetlb_vm_op_open(struct vm_area_struct *vma) |
| 1693 | { |
| 1694 | struct resv_map *reservations = vma_resv_map(vma); |
| 1695 | |
| 1696 | /* |
| 1697 | * This new VMA should share its siblings reservation map if present. |
| 1698 | * The VMA will only ever have a valid reservation map pointer where |
| 1699 | * it is being copied for another still existing VMA. As that VMA |
| 1700 | * has a reference to the reservation map it cannot dissappear until |
| 1701 | * after this open call completes. It is therefore safe to take a |
| 1702 | * new reference here without additional locking. |
| 1703 | */ |
| 1704 | if (reservations) |
| 1705 | kref_get(&reservations->refs); |
| 1706 | } |
| 1707 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1708 | static void hugetlb_vm_op_close(struct vm_area_struct *vma) |
| 1709 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1710 | struct hstate *h = hstate_vma(vma); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 1711 | struct resv_map *reservations = vma_resv_map(vma); |
| 1712 | unsigned long reserve; |
| 1713 | unsigned long start; |
| 1714 | unsigned long end; |
| 1715 | |
| 1716 | if (reservations) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1717 | start = vma_hugecache_offset(h, vma, vma->vm_start); |
| 1718 | end = vma_hugecache_offset(h, vma, vma->vm_end); |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 1719 | |
| 1720 | reserve = (end - start) - |
| 1721 | region_count(&reservations->regions, start, end); |
| 1722 | |
| 1723 | kref_put(&reservations->refs, resv_map_release); |
| 1724 | |
Adam Litke | 7251ff7 | 2008-07-23 21:27:59 -0700 | [diff] [blame] | 1725 | if (reserve) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1726 | hugetlb_acct_memory(h, -reserve); |
Adam Litke | 7251ff7 | 2008-07-23 21:27:59 -0700 | [diff] [blame] | 1727 | hugetlb_put_quota(vma->vm_file->f_mapping, reserve); |
| 1728 | } |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 1729 | } |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1730 | } |
| 1731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | /* |
| 1733 | * We cannot handle pagefaults against hugetlb pages at all. They cause |
| 1734 | * handle_mm_fault() to try to instantiate regular-sized pages in the |
| 1735 | * hugegpage VMA. do_page_fault() is supposed to trap this, so BUG is we get |
| 1736 | * this far. |
| 1737 | */ |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 1738 | static int hugetlb_vm_op_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | { |
| 1740 | BUG(); |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 1741 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | } |
| 1743 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 1744 | const struct vm_operations_struct hugetlb_vm_ops = { |
Nick Piggin | d0217ac | 2007-07-19 01:47:03 -0700 | [diff] [blame] | 1745 | .fault = hugetlb_vm_op_fault, |
Andy Whitcroft | 84afd99 | 2008-07-23 21:27:32 -0700 | [diff] [blame] | 1746 | .open = hugetlb_vm_op_open, |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 1747 | .close = hugetlb_vm_op_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | }; |
| 1749 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1750 | static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, |
| 1751 | int writable) |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1752 | { |
| 1753 | pte_t entry; |
| 1754 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1755 | if (writable) { |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1756 | entry = |
| 1757 | pte_mkwrite(pte_mkdirty(mk_pte(page, vma->vm_page_prot))); |
| 1758 | } else { |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 1759 | entry = huge_pte_wrprotect(mk_pte(page, vma->vm_page_prot)); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1760 | } |
| 1761 | entry = pte_mkyoung(entry); |
| 1762 | entry = pte_mkhuge(entry); |
| 1763 | |
| 1764 | return entry; |
| 1765 | } |
| 1766 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1767 | static void set_huge_ptep_writable(struct vm_area_struct *vma, |
| 1768 | unsigned long address, pte_t *ptep) |
| 1769 | { |
| 1770 | pte_t entry; |
| 1771 | |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 1772 | entry = pte_mkwrite(pte_mkdirty(huge_ptep_get(ptep))); |
| 1773 | if (huge_ptep_set_access_flags(vma, address, ptep, entry, 1)) { |
Benjamin Herrenschmidt | 8dab524 | 2007-06-16 10:16:12 -0700 | [diff] [blame] | 1774 | update_mmu_cache(vma, address, entry); |
Benjamin Herrenschmidt | 8dab524 | 2007-06-16 10:16:12 -0700 | [diff] [blame] | 1775 | } |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1776 | } |
| 1777 | |
| 1778 | |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1779 | int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, |
| 1780 | struct vm_area_struct *vma) |
| 1781 | { |
| 1782 | pte_t *src_pte, *dst_pte, entry; |
| 1783 | struct page *ptepage; |
Hugh Dickins | 1c59827 | 2005-10-19 21:23:43 -0700 | [diff] [blame] | 1784 | unsigned long addr; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1785 | int cow; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1786 | struct hstate *h = hstate_vma(vma); |
| 1787 | unsigned long sz = huge_page_size(h); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1788 | |
| 1789 | cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1790 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1791 | for (addr = vma->vm_start; addr < vma->vm_end; addr += sz) { |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 1792 | src_pte = huge_pte_offset(src, addr); |
| 1793 | if (!src_pte) |
| 1794 | continue; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1795 | dst_pte = huge_pte_alloc(dst, addr, sz); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1796 | if (!dst_pte) |
| 1797 | goto nomem; |
Larry Woodman | c5c9942 | 2008-01-24 05:49:25 -0800 | [diff] [blame] | 1798 | |
| 1799 | /* If the pagetables are shared don't copy or take references */ |
| 1800 | if (dst_pte == src_pte) |
| 1801 | continue; |
| 1802 | |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 1803 | spin_lock(&dst->page_table_lock); |
Nick Piggin | 4647875 | 2008-06-05 22:45:57 -0700 | [diff] [blame] | 1804 | spin_lock_nested(&src->page_table_lock, SINGLE_DEPTH_NESTING); |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 1805 | if (!huge_pte_none(huge_ptep_get(src_pte))) { |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1806 | if (cow) |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 1807 | huge_ptep_set_wrprotect(src, addr, src_pte); |
| 1808 | entry = huge_ptep_get(src_pte); |
Hugh Dickins | 1c59827 | 2005-10-19 21:23:43 -0700 | [diff] [blame] | 1809 | ptepage = pte_page(entry); |
| 1810 | get_page(ptepage); |
Hugh Dickins | 1c59827 | 2005-10-19 21:23:43 -0700 | [diff] [blame] | 1811 | set_huge_pte_at(dst, addr, dst_pte, entry); |
| 1812 | } |
| 1813 | spin_unlock(&src->page_table_lock); |
Hugh Dickins | c74df32 | 2005-10-29 18:16:23 -0700 | [diff] [blame] | 1814 | spin_unlock(&dst->page_table_lock); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1815 | } |
| 1816 | return 0; |
| 1817 | |
| 1818 | nomem: |
| 1819 | return -ENOMEM; |
| 1820 | } |
| 1821 | |
Chen, Kenneth W | 502717f | 2006-10-11 01:20:46 -0700 | [diff] [blame] | 1822 | void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1823 | unsigned long end, struct page *ref_page) |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1824 | { |
| 1825 | struct mm_struct *mm = vma->vm_mm; |
| 1826 | unsigned long address; |
David Gibson | c7546f8 | 2005-08-05 11:59:35 -0700 | [diff] [blame] | 1827 | pte_t *ptep; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1828 | pte_t pte; |
| 1829 | struct page *page; |
Chen, Kenneth W | fe1668a | 2006-10-04 02:15:24 -0700 | [diff] [blame] | 1830 | struct page *tmp; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1831 | struct hstate *h = hstate_vma(vma); |
| 1832 | unsigned long sz = huge_page_size(h); |
| 1833 | |
Chen, Kenneth W | c0a499c | 2006-12-06 20:31:39 -0800 | [diff] [blame] | 1834 | /* |
| 1835 | * A page gathering list, protected by per file i_mmap_lock. The |
| 1836 | * lock is used to avoid list corruption from multiple unmapping |
| 1837 | * of the same page since we are using page->lru. |
| 1838 | */ |
Chen, Kenneth W | fe1668a | 2006-10-04 02:15:24 -0700 | [diff] [blame] | 1839 | LIST_HEAD(page_list); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1840 | |
| 1841 | WARN_ON(!is_vm_hugetlb_page(vma)); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1842 | BUG_ON(start & ~huge_page_mask(h)); |
| 1843 | BUG_ON(end & ~huge_page_mask(h)); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1844 | |
Andrea Arcangeli | cddb8a5 | 2008-07-28 15:46:29 -0700 | [diff] [blame] | 1845 | mmu_notifier_invalidate_range_start(mm, start, end); |
Hugh Dickins | 508034a | 2005-10-29 18:16:30 -0700 | [diff] [blame] | 1846 | spin_lock(&mm->page_table_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1847 | for (address = start; address < end; address += sz) { |
David Gibson | c7546f8 | 2005-08-05 11:59:35 -0700 | [diff] [blame] | 1848 | ptep = huge_pte_offset(mm, address); |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 1849 | if (!ptep) |
David Gibson | c7546f8 | 2005-08-05 11:59:35 -0700 | [diff] [blame] | 1850 | continue; |
| 1851 | |
Chen, Kenneth W | 39dde65 | 2006-12-06 20:32:03 -0800 | [diff] [blame] | 1852 | if (huge_pmd_unshare(mm, &address, ptep)) |
| 1853 | continue; |
| 1854 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1855 | /* |
| 1856 | * If a reference page is supplied, it is because a specific |
| 1857 | * page is being unmapped, not a range. Ensure the page we |
| 1858 | * are about to unmap is the actual page of interest. |
| 1859 | */ |
| 1860 | if (ref_page) { |
| 1861 | pte = huge_ptep_get(ptep); |
| 1862 | if (huge_pte_none(pte)) |
| 1863 | continue; |
| 1864 | page = pte_page(pte); |
| 1865 | if (page != ref_page) |
| 1866 | continue; |
| 1867 | |
| 1868 | /* |
| 1869 | * Mark the VMA as having unmapped its page so that |
| 1870 | * future faults in this VMA will fail rather than |
| 1871 | * looking like data was lost |
| 1872 | */ |
| 1873 | set_vma_resv_flags(vma, HPAGE_RESV_UNMAPPED); |
| 1874 | } |
| 1875 | |
David Gibson | c7546f8 | 2005-08-05 11:59:35 -0700 | [diff] [blame] | 1876 | pte = huge_ptep_get_and_clear(mm, address, ptep); |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 1877 | if (huge_pte_none(pte)) |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1878 | continue; |
David Gibson | c7546f8 | 2005-08-05 11:59:35 -0700 | [diff] [blame] | 1879 | |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1880 | page = pte_page(pte); |
Ken Chen | 6649a38 | 2007-02-08 14:20:27 -0800 | [diff] [blame] | 1881 | if (pte_dirty(pte)) |
| 1882 | set_page_dirty(page); |
Chen, Kenneth W | fe1668a | 2006-10-04 02:15:24 -0700 | [diff] [blame] | 1883 | list_add(&page->lru, &page_list); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1884 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | spin_unlock(&mm->page_table_lock); |
Hugh Dickins | 508034a | 2005-10-29 18:16:30 -0700 | [diff] [blame] | 1886 | flush_tlb_range(vma, start, end); |
Andrea Arcangeli | cddb8a5 | 2008-07-28 15:46:29 -0700 | [diff] [blame] | 1887 | mmu_notifier_invalidate_range_end(mm, start, end); |
Chen, Kenneth W | fe1668a | 2006-10-04 02:15:24 -0700 | [diff] [blame] | 1888 | list_for_each_entry_safe(page, tmp, &page_list, lru) { |
| 1889 | list_del(&page->lru); |
| 1890 | put_page(page); |
| 1891 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | } |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 1893 | |
Chen, Kenneth W | 502717f | 2006-10-11 01:20:46 -0700 | [diff] [blame] | 1894 | void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1895 | unsigned long end, struct page *ref_page) |
Chen, Kenneth W | 502717f | 2006-10-11 01:20:46 -0700 | [diff] [blame] | 1896 | { |
Andi Kleen | a137e1c | 2008-07-23 21:27:43 -0700 | [diff] [blame] | 1897 | spin_lock(&vma->vm_file->f_mapping->i_mmap_lock); |
| 1898 | __unmap_hugepage_range(vma, start, end, ref_page); |
| 1899 | spin_unlock(&vma->vm_file->f_mapping->i_mmap_lock); |
Chen, Kenneth W | 502717f | 2006-10-11 01:20:46 -0700 | [diff] [blame] | 1900 | } |
| 1901 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1902 | /* |
| 1903 | * This is called when the original mapper is failing to COW a MAP_PRIVATE |
| 1904 | * mappping it owns the reserve page for. The intention is to unmap the page |
| 1905 | * from other VMAs and let the children be SIGKILLed if they are faulting the |
| 1906 | * same region. |
| 1907 | */ |
Harvey Harrison | 2a4b3de | 2008-10-18 20:27:06 -0700 | [diff] [blame] | 1908 | static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma, |
| 1909 | struct page *page, unsigned long address) |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1910 | { |
Adam Litke | 7526674 | 2008-11-12 13:24:56 -0800 | [diff] [blame] | 1911 | struct hstate *h = hstate_vma(vma); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1912 | struct vm_area_struct *iter_vma; |
| 1913 | struct address_space *mapping; |
| 1914 | struct prio_tree_iter iter; |
| 1915 | pgoff_t pgoff; |
| 1916 | |
| 1917 | /* |
| 1918 | * vm_pgoff is in PAGE_SIZE units, hence the different calculation |
| 1919 | * from page cache lookup which is in HPAGE_SIZE units. |
| 1920 | */ |
Adam Litke | 7526674 | 2008-11-12 13:24:56 -0800 | [diff] [blame] | 1921 | address = address & huge_page_mask(h); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1922 | pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) |
| 1923 | + (vma->vm_pgoff >> PAGE_SHIFT); |
| 1924 | mapping = (struct address_space *)page_private(page); |
| 1925 | |
| 1926 | vma_prio_tree_foreach(iter_vma, &iter, &mapping->i_mmap, pgoff, pgoff) { |
| 1927 | /* Do not unmap the current VMA */ |
| 1928 | if (iter_vma == vma) |
| 1929 | continue; |
| 1930 | |
| 1931 | /* |
| 1932 | * Unmap the page from other VMAs without their own reserves. |
| 1933 | * They get marked to be SIGKILLed if they fault in these |
| 1934 | * areas. This is because a future no-page fault on this VMA |
| 1935 | * could insert a zeroed page instead of the data existing |
| 1936 | * from the time of fork. This would look like data corruption |
| 1937 | */ |
| 1938 | if (!is_vma_resv_set(iter_vma, HPAGE_RESV_OWNER)) |
| 1939 | unmap_hugepage_range(iter_vma, |
Adam Litke | 7526674 | 2008-11-12 13:24:56 -0800 | [diff] [blame] | 1940 | address, address + huge_page_size(h), |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1941 | page); |
| 1942 | } |
| 1943 | |
| 1944 | return 1; |
| 1945 | } |
| 1946 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1947 | static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1948 | unsigned long address, pte_t *ptep, pte_t pte, |
| 1949 | struct page *pagecache_page) |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1950 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1951 | struct hstate *h = hstate_vma(vma); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1952 | struct page *old_page, *new_page; |
David Gibson | 79ac6ba | 2006-03-22 00:08:51 -0800 | [diff] [blame] | 1953 | int avoidcopy; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1954 | int outside_reserve = 0; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1955 | |
| 1956 | old_page = pte_page(pte); |
| 1957 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1958 | retry_avoidcopy: |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1959 | /* If no-one else is actually using this page, avoid the copy |
| 1960 | * and just make the page writable */ |
| 1961 | avoidcopy = (page_count(old_page) == 1); |
| 1962 | if (avoidcopy) { |
| 1963 | set_huge_ptep_writable(vma, address, ptep); |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 1964 | return 0; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1965 | } |
| 1966 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1967 | /* |
| 1968 | * If the process that created a MAP_PRIVATE mapping is about to |
| 1969 | * perform a COW due to a shared page count, attempt to satisfy |
| 1970 | * the allocation without using the existing reserves. The pagecache |
| 1971 | * page is used to determine if the reserve at this address was |
| 1972 | * consumed or not. If reserves were used, a partial faulted mapping |
| 1973 | * at the time of fork() could consume its reserves on COW instead |
| 1974 | * of the full address range. |
| 1975 | */ |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 1976 | if (!(vma->vm_flags & VM_MAYSHARE) && |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1977 | is_vma_resv_set(vma, HPAGE_RESV_OWNER) && |
| 1978 | old_page != pagecache_page) |
| 1979 | outside_reserve = 1; |
| 1980 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1981 | page_cache_get(old_page); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1982 | new_page = alloc_huge_page(vma, address, outside_reserve); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1983 | |
Adam Litke | 2fc39ce | 2007-11-14 16:59:39 -0800 | [diff] [blame] | 1984 | if (IS_ERR(new_page)) { |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 1985 | page_cache_release(old_page); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 1986 | |
| 1987 | /* |
| 1988 | * If a process owning a MAP_PRIVATE mapping fails to COW, |
| 1989 | * it is due to references held by a child and an insufficient |
| 1990 | * huge page pool. To guarantee the original mappers |
| 1991 | * reliability, unmap the page from child processes. The child |
| 1992 | * may get SIGKILLed if it later faults. |
| 1993 | */ |
| 1994 | if (outside_reserve) { |
| 1995 | BUG_ON(huge_pte_none(pte)); |
| 1996 | if (unmap_ref_private(mm, vma, old_page, address)) { |
| 1997 | BUG_ON(page_count(old_page) != 1); |
| 1998 | BUG_ON(huge_pte_none(pte)); |
| 1999 | goto retry_avoidcopy; |
| 2000 | } |
| 2001 | WARN_ON_ONCE(1); |
| 2002 | } |
| 2003 | |
Adam Litke | 2fc39ce | 2007-11-14 16:59:39 -0800 | [diff] [blame] | 2004 | return -PTR_ERR(new_page); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2005 | } |
| 2006 | |
| 2007 | spin_unlock(&mm->page_table_lock); |
Atsushi Nemoto | 9de455b | 2006-12-12 17:14:55 +0000 | [diff] [blame] | 2008 | copy_huge_page(new_page, old_page, address, vma); |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 2009 | __SetPageUptodate(new_page); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2010 | spin_lock(&mm->page_table_lock); |
| 2011 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2012 | ptep = huge_pte_offset(mm, address & huge_page_mask(h)); |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 2013 | if (likely(pte_same(huge_ptep_get(ptep), pte))) { |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2014 | /* Break COW */ |
Gerald Schaefer | 8fe627e | 2008-04-28 02:13:28 -0700 | [diff] [blame] | 2015 | huge_ptep_clear_flush(vma, address, ptep); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2016 | set_huge_pte_at(mm, address, ptep, |
| 2017 | make_huge_pte(vma, new_page, 1)); |
| 2018 | /* Make the old page be freed below */ |
| 2019 | new_page = old_page; |
| 2020 | } |
| 2021 | page_cache_release(new_page); |
| 2022 | page_cache_release(old_page); |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 2023 | return 0; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2024 | } |
| 2025 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2026 | /* Return the pagecache page at a given address within a VMA */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2027 | static struct page *hugetlbfs_pagecache_page(struct hstate *h, |
| 2028 | struct vm_area_struct *vma, unsigned long address) |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2029 | { |
| 2030 | struct address_space *mapping; |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 2031 | pgoff_t idx; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2032 | |
| 2033 | mapping = vma->vm_file->f_mapping; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2034 | idx = vma_hugecache_offset(h, vma, address); |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2035 | |
| 2036 | return find_lock_page(mapping, idx); |
| 2037 | } |
| 2038 | |
Hugh Dickins | 3ae77f4 | 2009-09-21 17:03:33 -0700 | [diff] [blame] | 2039 | /* |
| 2040 | * Return whether there is a pagecache page to back given address within VMA. |
| 2041 | * Caller follow_hugetlb_page() holds page_table_lock so we cannot lock_page. |
| 2042 | */ |
| 2043 | static bool hugetlbfs_pagecache_present(struct hstate *h, |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2044 | struct vm_area_struct *vma, unsigned long address) |
| 2045 | { |
| 2046 | struct address_space *mapping; |
| 2047 | pgoff_t idx; |
| 2048 | struct page *page; |
| 2049 | |
| 2050 | mapping = vma->vm_file->f_mapping; |
| 2051 | idx = vma_hugecache_offset(h, vma, address); |
| 2052 | |
| 2053 | page = find_get_page(mapping, idx); |
| 2054 | if (page) |
| 2055 | put_page(page); |
| 2056 | return page != NULL; |
| 2057 | } |
| 2058 | |
Robert P. J. Day | a1ed3dd | 2007-07-17 04:03:33 -0700 | [diff] [blame] | 2059 | static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma, |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 2060 | unsigned long address, pte_t *ptep, unsigned int flags) |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 2061 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2062 | struct hstate *h = hstate_vma(vma); |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 2063 | int ret = VM_FAULT_SIGBUS; |
Andy Whitcroft | e7c4b0b | 2008-07-23 21:27:26 -0700 | [diff] [blame] | 2064 | pgoff_t idx; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2065 | unsigned long size; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2066 | struct page *page; |
| 2067 | struct address_space *mapping; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2068 | pte_t new_pte; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2069 | |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2070 | /* |
| 2071 | * Currently, we are forced to kill the process in the event the |
| 2072 | * original mapper has unmapped pages from the child due to a failed |
| 2073 | * COW. Warn that such a situation has occured as it may not be obvious |
| 2074 | */ |
| 2075 | if (is_vma_resv_set(vma, HPAGE_RESV_UNMAPPED)) { |
| 2076 | printk(KERN_WARNING |
| 2077 | "PID %d killed due to inadequate hugepage pool\n", |
| 2078 | current->pid); |
| 2079 | return ret; |
| 2080 | } |
| 2081 | |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2082 | mapping = vma->vm_file->f_mapping; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2083 | idx = vma_hugecache_offset(h, vma, address); |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2084 | |
| 2085 | /* |
| 2086 | * Use page lock to guard against racing truncation |
| 2087 | * before we get page_table_lock. |
| 2088 | */ |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 2089 | retry: |
| 2090 | page = find_lock_page(mapping, idx); |
| 2091 | if (!page) { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2092 | size = i_size_read(mapping->host) >> huge_page_shift(h); |
Hugh Dickins | ebed4bf | 2006-10-28 10:38:43 -0700 | [diff] [blame] | 2093 | if (idx >= size) |
| 2094 | goto out; |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2095 | page = alloc_huge_page(vma, address, 0); |
Adam Litke | 2fc39ce | 2007-11-14 16:59:39 -0800 | [diff] [blame] | 2096 | if (IS_ERR(page)) { |
| 2097 | ret = -PTR_ERR(page); |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 2098 | goto out; |
| 2099 | } |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2100 | clear_huge_page(page, address, huge_page_size(h)); |
Nick Piggin | 0ed361d | 2008-02-04 22:29:34 -0800 | [diff] [blame] | 2101 | __SetPageUptodate(page); |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 2102 | |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 2103 | if (vma->vm_flags & VM_MAYSHARE) { |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 2104 | int err; |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 2105 | struct inode *inode = mapping->host; |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 2106 | |
| 2107 | err = add_to_page_cache(page, mapping, idx, GFP_KERNEL); |
| 2108 | if (err) { |
| 2109 | put_page(page); |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 2110 | if (err == -EEXIST) |
| 2111 | goto retry; |
| 2112 | goto out; |
| 2113 | } |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 2114 | |
| 2115 | spin_lock(&inode->i_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2116 | inode->i_blocks += blocks_per_huge_page(h); |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 2117 | spin_unlock(&inode->i_lock); |
Christoph Lameter | 6bda666 | 2006-01-06 00:10:49 -0800 | [diff] [blame] | 2118 | } else |
| 2119 | lock_page(page); |
| 2120 | } |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2121 | |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 2122 | /* |
| 2123 | * If we are going to COW a private mapping later, we examine the |
| 2124 | * pending reservations for this page now. This will ensure that |
| 2125 | * any allocations necessary to record that reservation occur outside |
| 2126 | * the spinlock. |
| 2127 | */ |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 2128 | if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) |
Andy Whitcroft | 2b26736 | 2008-08-12 15:08:49 -0700 | [diff] [blame] | 2129 | if (vma_needs_reservation(h, vma, address) < 0) { |
| 2130 | ret = VM_FAULT_OOM; |
| 2131 | goto backout_unlocked; |
| 2132 | } |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 2133 | |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 2134 | spin_lock(&mm->page_table_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2135 | size = i_size_read(mapping->host) >> huge_page_shift(h); |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2136 | if (idx >= size) |
| 2137 | goto backout; |
| 2138 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 2139 | ret = 0; |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 2140 | if (!huge_pte_none(huge_ptep_get(ptep))) |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2141 | goto backout; |
| 2142 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2143 | new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE) |
| 2144 | && (vma->vm_flags & VM_SHARED))); |
| 2145 | set_huge_pte_at(mm, address, ptep, new_pte); |
| 2146 | |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 2147 | if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) { |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2148 | /* Optimization, do the COW without a second fault */ |
Mel Gorman | 04f2cbe | 2008-07-23 21:27:25 -0700 | [diff] [blame] | 2149 | ret = hugetlb_cow(mm, vma, address, ptep, new_pte, page); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2150 | } |
| 2151 | |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 2152 | spin_unlock(&mm->page_table_lock); |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2153 | unlock_page(page); |
| 2154 | out: |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 2155 | return ret; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2156 | |
| 2157 | backout: |
| 2158 | spin_unlock(&mm->page_table_lock); |
Andy Whitcroft | 2b26736 | 2008-08-12 15:08:49 -0700 | [diff] [blame] | 2159 | backout_unlocked: |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2160 | unlock_page(page); |
| 2161 | put_page(page); |
| 2162 | goto out; |
Hugh Dickins | ac9b9c6 | 2005-10-20 16:24:28 +0100 | [diff] [blame] | 2163 | } |
| 2164 | |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 2165 | int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 2166 | unsigned long address, unsigned int flags) |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 2167 | { |
| 2168 | pte_t *ptep; |
| 2169 | pte_t entry; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2170 | int ret; |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 2171 | struct page *pagecache_page = NULL; |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 2172 | static DEFINE_MUTEX(hugetlb_instantiation_mutex); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2173 | struct hstate *h = hstate_vma(vma); |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 2174 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2175 | ptep = huge_pte_alloc(mm, address, huge_page_size(h)); |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 2176 | if (!ptep) |
| 2177 | return VM_FAULT_OOM; |
| 2178 | |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 2179 | /* |
| 2180 | * Serialize hugepage allocation and instantiation, so that we don't |
| 2181 | * get spurious allocation failures if two CPUs race to instantiate |
| 2182 | * the same page in the page cache. |
| 2183 | */ |
| 2184 | mutex_lock(&hugetlb_instantiation_mutex); |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 2185 | entry = huge_ptep_get(ptep); |
| 2186 | if (huge_pte_none(entry)) { |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 2187 | ret = hugetlb_no_page(mm, vma, address, ptep, flags); |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 2188 | goto out_mutex; |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 2189 | } |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 2190 | |
Nick Piggin | 83c5407 | 2007-07-19 01:47:05 -0700 | [diff] [blame] | 2191 | ret = 0; |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2192 | |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 2193 | /* |
| 2194 | * If we are going to COW the mapping later, we examine the pending |
| 2195 | * reservations for this page now. This will ensure that any |
| 2196 | * allocations necessary to record that reservation occur outside the |
| 2197 | * spinlock. For private mappings, we also lookup the pagecache |
| 2198 | * page now as it is used to determine if a reservation has been |
| 2199 | * consumed. |
| 2200 | */ |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 2201 | if ((flags & FAULT_FLAG_WRITE) && !pte_write(entry)) { |
Andy Whitcroft | 2b26736 | 2008-08-12 15:08:49 -0700 | [diff] [blame] | 2202 | if (vma_needs_reservation(h, vma, address) < 0) { |
| 2203 | ret = VM_FAULT_OOM; |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 2204 | goto out_mutex; |
Andy Whitcroft | 2b26736 | 2008-08-12 15:08:49 -0700 | [diff] [blame] | 2205 | } |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 2206 | |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 2207 | if (!(vma->vm_flags & VM_MAYSHARE)) |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 2208 | pagecache_page = hugetlbfs_pagecache_page(h, |
| 2209 | vma, address); |
| 2210 | } |
| 2211 | |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2212 | spin_lock(&mm->page_table_lock); |
| 2213 | /* Check for a racing update before calling hugetlb_cow */ |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 2214 | if (unlikely(!pte_same(entry, huge_ptep_get(ptep)))) |
| 2215 | goto out_page_table_lock; |
| 2216 | |
| 2217 | |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 2218 | if (flags & FAULT_FLAG_WRITE) { |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 2219 | if (!pte_write(entry)) { |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 2220 | ret = hugetlb_cow(mm, vma, address, ptep, entry, |
| 2221 | pagecache_page); |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 2222 | goto out_page_table_lock; |
| 2223 | } |
| 2224 | entry = pte_mkdirty(entry); |
| 2225 | } |
| 2226 | entry = pte_mkyoung(entry); |
Hugh Dickins | 788c7df | 2009-06-23 13:49:05 +0100 | [diff] [blame] | 2227 | if (huge_ptep_set_access_flags(vma, address, ptep, entry, |
| 2228 | flags & FAULT_FLAG_WRITE)) |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 2229 | update_mmu_cache(vma, address, entry); |
| 2230 | |
| 2231 | out_page_table_lock: |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2232 | spin_unlock(&mm->page_table_lock); |
Andy Whitcroft | 57303d8 | 2008-08-12 15:08:47 -0700 | [diff] [blame] | 2233 | |
| 2234 | if (pagecache_page) { |
| 2235 | unlock_page(pagecache_page); |
| 2236 | put_page(pagecache_page); |
| 2237 | } |
| 2238 | |
David Gibson | b4d1d99 | 2008-10-15 22:01:11 -0700 | [diff] [blame] | 2239 | out_mutex: |
David Gibson | 3935baa | 2006-03-22 00:08:53 -0800 | [diff] [blame] | 2240 | mutex_unlock(&hugetlb_instantiation_mutex); |
David Gibson | 1e8f889 | 2006-01-06 00:10:44 -0800 | [diff] [blame] | 2241 | |
| 2242 | return ret; |
Adam Litke | 86e5216 | 2006-01-06 00:10:43 -0800 | [diff] [blame] | 2243 | } |
| 2244 | |
Andi Kleen | ceb8687 | 2008-07-23 21:27:50 -0700 | [diff] [blame] | 2245 | /* Can be overriden by architectures */ |
| 2246 | __attribute__((weak)) struct page * |
| 2247 | follow_huge_pud(struct mm_struct *mm, unsigned long address, |
| 2248 | pud_t *pud, int write) |
| 2249 | { |
| 2250 | BUG(); |
| 2251 | return NULL; |
| 2252 | } |
| 2253 | |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2254 | int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, |
| 2255 | struct page **pages, struct vm_area_struct **vmas, |
Adam Litke | 5b23dbe | 2007-11-14 16:59:33 -0800 | [diff] [blame] | 2256 | unsigned long *position, int *length, int i, |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2257 | unsigned int flags) |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2258 | { |
Chen, Kenneth W | d5d4b0a | 2006-03-22 00:09:03 -0800 | [diff] [blame] | 2259 | unsigned long pfn_offset; |
| 2260 | unsigned long vaddr = *position; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2261 | int remainder = *length; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2262 | struct hstate *h = hstate_vma(vma); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2263 | |
Hugh Dickins | 1c59827 | 2005-10-19 21:23:43 -0700 | [diff] [blame] | 2264 | spin_lock(&mm->page_table_lock); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2265 | while (vaddr < vma->vm_end && remainder) { |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2266 | pte_t *pte; |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2267 | int absent; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2268 | struct page *page; |
| 2269 | |
| 2270 | /* |
| 2271 | * Some archs (sparc64, sh*) have multiple pte_ts to |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2272 | * each hugepage. We have to make sure we get the |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2273 | * first, for the page indexing below to work. |
| 2274 | */ |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2275 | pte = huge_pte_offset(mm, vaddr & huge_page_mask(h)); |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2276 | absent = !pte || huge_pte_none(huge_ptep_get(pte)); |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2277 | |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2278 | /* |
| 2279 | * When coredumping, it suits get_dump_page if we just return |
Hugh Dickins | 3ae77f4 | 2009-09-21 17:03:33 -0700 | [diff] [blame] | 2280 | * an error where there's an empty slot with no huge pagecache |
| 2281 | * to back it. This way, we avoid allocating a hugepage, and |
| 2282 | * the sparse dumpfile avoids allocating disk blocks, but its |
| 2283 | * huge holes still show up with zeroes where they need to be. |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2284 | */ |
Hugh Dickins | 3ae77f4 | 2009-09-21 17:03:33 -0700 | [diff] [blame] | 2285 | if (absent && (flags & FOLL_DUMP) && |
| 2286 | !hugetlbfs_pagecache_present(h, vma, vaddr)) { |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2287 | remainder = 0; |
| 2288 | break; |
| 2289 | } |
| 2290 | |
| 2291 | if (absent || |
| 2292 | ((flags & FOLL_WRITE) && !pte_write(huge_ptep_get(pte)))) { |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2293 | int ret; |
| 2294 | |
| 2295 | spin_unlock(&mm->page_table_lock); |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2296 | ret = hugetlb_fault(mm, vma, vaddr, |
| 2297 | (flags & FOLL_WRITE) ? FAULT_FLAG_WRITE : 0); |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2298 | spin_lock(&mm->page_table_lock); |
Adam Litke | a89182c | 2007-08-22 14:01:51 -0700 | [diff] [blame] | 2299 | if (!(ret & VM_FAULT_ERROR)) |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2300 | continue; |
| 2301 | |
| 2302 | remainder = 0; |
Adam Litke | 4c88726 | 2005-10-29 18:16:46 -0700 | [diff] [blame] | 2303 | break; |
| 2304 | } |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2305 | |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2306 | pfn_offset = (vaddr & ~huge_page_mask(h)) >> PAGE_SHIFT; |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 2307 | page = pte_page(huge_ptep_get(pte)); |
Chen, Kenneth W | d5d4b0a | 2006-03-22 00:09:03 -0800 | [diff] [blame] | 2308 | same_page: |
Chen, Kenneth W | d669218 | 2006-03-31 02:29:57 -0800 | [diff] [blame] | 2309 | if (pages) { |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2310 | pages[i] = mem_map_offset(page, pfn_offset); |
KOSAKI Motohiro | 4b2e38a | 2008-10-18 20:27:10 -0700 | [diff] [blame] | 2311 | get_page(pages[i]); |
Chen, Kenneth W | d669218 | 2006-03-31 02:29:57 -0800 | [diff] [blame] | 2312 | } |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2313 | |
| 2314 | if (vmas) |
| 2315 | vmas[i] = vma; |
| 2316 | |
| 2317 | vaddr += PAGE_SIZE; |
Chen, Kenneth W | d5d4b0a | 2006-03-22 00:09:03 -0800 | [diff] [blame] | 2318 | ++pfn_offset; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2319 | --remainder; |
| 2320 | ++i; |
Chen, Kenneth W | d5d4b0a | 2006-03-22 00:09:03 -0800 | [diff] [blame] | 2321 | if (vaddr < vma->vm_end && remainder && |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2322 | pfn_offset < pages_per_huge_page(h)) { |
Chen, Kenneth W | d5d4b0a | 2006-03-22 00:09:03 -0800 | [diff] [blame] | 2323 | /* |
| 2324 | * We use pfn_offset to avoid touching the pageframes |
| 2325 | * of this compound page. |
| 2326 | */ |
| 2327 | goto same_page; |
| 2328 | } |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2329 | } |
Hugh Dickins | 1c59827 | 2005-10-19 21:23:43 -0700 | [diff] [blame] | 2330 | spin_unlock(&mm->page_table_lock); |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2331 | *length = remainder; |
| 2332 | *position = vaddr; |
| 2333 | |
Hugh Dickins | 2a15efc | 2009-09-21 17:03:27 -0700 | [diff] [blame] | 2334 | return i ? i : -EFAULT; |
David Gibson | 63551ae | 2005-06-21 17:14:44 -0700 | [diff] [blame] | 2335 | } |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 2336 | |
| 2337 | void hugetlb_change_protection(struct vm_area_struct *vma, |
| 2338 | unsigned long address, unsigned long end, pgprot_t newprot) |
| 2339 | { |
| 2340 | struct mm_struct *mm = vma->vm_mm; |
| 2341 | unsigned long start = address; |
| 2342 | pte_t *ptep; |
| 2343 | pte_t pte; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2344 | struct hstate *h = hstate_vma(vma); |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 2345 | |
| 2346 | BUG_ON(address >= end); |
| 2347 | flush_cache_range(vma, address, end); |
| 2348 | |
Chen, Kenneth W | 39dde65 | 2006-12-06 20:32:03 -0800 | [diff] [blame] | 2349 | spin_lock(&vma->vm_file->f_mapping->i_mmap_lock); |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 2350 | spin_lock(&mm->page_table_lock); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2351 | for (; address < end; address += huge_page_size(h)) { |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 2352 | ptep = huge_pte_offset(mm, address); |
| 2353 | if (!ptep) |
| 2354 | continue; |
Chen, Kenneth W | 39dde65 | 2006-12-06 20:32:03 -0800 | [diff] [blame] | 2355 | if (huge_pmd_unshare(mm, &address, ptep)) |
| 2356 | continue; |
Gerald Schaefer | 7f2e952 | 2008-04-28 02:13:29 -0700 | [diff] [blame] | 2357 | if (!huge_pte_none(huge_ptep_get(ptep))) { |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 2358 | pte = huge_ptep_get_and_clear(mm, address, ptep); |
| 2359 | pte = pte_mkhuge(pte_modify(pte, newprot)); |
| 2360 | set_huge_pte_at(mm, address, ptep, pte); |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 2361 | } |
| 2362 | } |
| 2363 | spin_unlock(&mm->page_table_lock); |
Chen, Kenneth W | 39dde65 | 2006-12-06 20:32:03 -0800 | [diff] [blame] | 2364 | spin_unlock(&vma->vm_file->f_mapping->i_mmap_lock); |
Zhang, Yanmin | 8f86059 | 2006-03-22 00:08:50 -0800 | [diff] [blame] | 2365 | |
| 2366 | flush_tlb_range(vma, start, end); |
| 2367 | } |
| 2368 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 2369 | int hugetlb_reserve_pages(struct inode *inode, |
| 2370 | long from, long to, |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 2371 | struct vm_area_struct *vma, |
| 2372 | int acctflag) |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 2373 | { |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 2374 | long ret, chg; |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2375 | struct hstate *h = hstate_inode(inode); |
Adam Litke | e4e574b | 2007-10-16 01:26:19 -0700 | [diff] [blame] | 2376 | |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 2377 | /* |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 2378 | * Only apply hugepage reservation if asked. At fault time, an |
| 2379 | * attempt will be made for VM_NORESERVE to allocate a page |
| 2380 | * and filesystem quota without using reserves |
| 2381 | */ |
| 2382 | if (acctflag & VM_NORESERVE) |
| 2383 | return 0; |
| 2384 | |
| 2385 | /* |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 2386 | * Shared mappings base their reservation on the number of pages that |
| 2387 | * are already allocated on behalf of the file. Private mappings need |
| 2388 | * to reserve the full area even if read-only as mprotect() may be |
| 2389 | * called to make the mapping read-write. Assume !vma is a shm mapping |
| 2390 | */ |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 2391 | if (!vma || vma->vm_flags & VM_MAYSHARE) |
Mel Gorman | a1e7877 | 2008-07-23 21:27:23 -0700 | [diff] [blame] | 2392 | chg = region_chg(&inode->i_mapping->private_list, from, to); |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 2393 | else { |
| 2394 | struct resv_map *resv_map = resv_map_alloc(); |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 2395 | if (!resv_map) |
| 2396 | return -ENOMEM; |
| 2397 | |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 2398 | chg = to - from; |
| 2399 | |
Mel Gorman | 5a6fe12 | 2009-02-10 14:02:27 +0000 | [diff] [blame] | 2400 | set_vma_resv_map(vma, resv_map); |
| 2401 | set_vma_resv_flags(vma, HPAGE_RESV_OWNER); |
| 2402 | } |
| 2403 | |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 2404 | if (chg < 0) |
| 2405 | return chg; |
| 2406 | |
| 2407 | /* There must be enough filesystem quota for the mapping */ |
| 2408 | if (hugetlb_get_quota(inode->i_mapping, chg)) |
| 2409 | return -ENOSPC; |
| 2410 | |
| 2411 | /* |
| 2412 | * Check enough hugepages are available for the reservation. |
| 2413 | * Hand back the quota if there are not |
| 2414 | */ |
| 2415 | ret = hugetlb_acct_memory(h, chg); |
| 2416 | if (ret < 0) { |
| 2417 | hugetlb_put_quota(inode->i_mapping, chg); |
| 2418 | return ret; |
| 2419 | } |
| 2420 | |
| 2421 | /* |
| 2422 | * Account for the reservations made. Shared mappings record regions |
| 2423 | * that have reservations as they are shared by multiple VMAs. |
| 2424 | * When the last VMA disappears, the region map says how much |
| 2425 | * the reservation was and the page cache tells how much of |
| 2426 | * the reservation was consumed. Private mappings are per-VMA and |
| 2427 | * only the consumed reservations are tracked. When the VMA |
| 2428 | * disappears, the original reservation is the VMA size and the |
| 2429 | * consumed reservations are stored in the map. Hence, nothing |
| 2430 | * else has to be done for private mappings here |
| 2431 | */ |
Mel Gorman | f83a275 | 2009-05-28 14:34:40 -0700 | [diff] [blame] | 2432 | if (!vma || vma->vm_flags & VM_MAYSHARE) |
Mel Gorman | 17c9d12 | 2009-02-11 16:34:16 +0000 | [diff] [blame] | 2433 | region_add(&inode->i_mapping->private_list, from, to); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 2434 | return 0; |
| 2435 | } |
| 2436 | |
| 2437 | void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed) |
| 2438 | { |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2439 | struct hstate *h = hstate_inode(inode); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 2440 | long chg = region_truncate(&inode->i_mapping->private_list, offset); |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 2441 | |
| 2442 | spin_lock(&inode->i_lock); |
Eric Sandeen | e4c6f8b | 2009-07-29 15:02:16 -0700 | [diff] [blame] | 2443 | inode->i_blocks -= (blocks_per_huge_page(h) * freed); |
Ken Chen | 45c682a | 2007-11-14 16:59:44 -0800 | [diff] [blame] | 2444 | spin_unlock(&inode->i_lock); |
| 2445 | |
Adam Litke | 90d8b7e | 2007-11-14 16:59:42 -0800 | [diff] [blame] | 2446 | hugetlb_put_quota(inode->i_mapping, (chg - freed)); |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 2447 | hugetlb_acct_memory(h, -(chg - freed)); |
Chen, Kenneth W | a43a8c3 | 2006-06-23 02:03:15 -0700 | [diff] [blame] | 2448 | } |