Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/mm/memory_hotplug.c |
| 3 | * |
| 4 | * Copyright (C) |
| 5 | */ |
| 6 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 7 | #include <linux/stddef.h> |
| 8 | #include <linux/mm.h> |
| 9 | #include <linux/swap.h> |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/pagemap.h> |
| 12 | #include <linux/bootmem.h> |
| 13 | #include <linux/compiler.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/pagevec.h> |
Chandra Seetharaman | 2d1d43f | 2006-09-29 02:01:25 -0700 | [diff] [blame] | 16 | #include <linux/writeback.h> |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 17 | #include <linux/slab.h> |
| 18 | #include <linux/sysctl.h> |
| 19 | #include <linux/cpu.h> |
| 20 | #include <linux/memory.h> |
| 21 | #include <linux/memory_hotplug.h> |
| 22 | #include <linux/highmem.h> |
| 23 | #include <linux/vmalloc.h> |
KAMEZAWA Hiroyuki | 0a54703 | 2006-06-27 02:53:35 -0700 | [diff] [blame] | 24 | #include <linux/ioport.h> |
Paul Jackson | 38837fc | 2006-09-29 02:01:16 -0700 | [diff] [blame] | 25 | #include <linux/cpuset.h> |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 26 | #include <linux/delay.h> |
| 27 | #include <linux/migrate.h> |
| 28 | #include <linux/page-isolation.h> |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 29 | |
| 30 | #include <asm/tlbflush.h> |
| 31 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 32 | /* add this memory to iomem resource */ |
| 33 | static struct resource *register_memory_resource(u64 start, u64 size) |
| 34 | { |
| 35 | struct resource *res; |
| 36 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
| 37 | BUG_ON(!res); |
| 38 | |
| 39 | res->name = "System RAM"; |
| 40 | res->start = start; |
| 41 | res->end = start + size - 1; |
Yasunori Goto | 887c3cb | 2007-11-14 16:59:20 -0800 | [diff] [blame] | 42 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 43 | if (request_resource(&iomem_resource, res) < 0) { |
| 44 | printk("System RAM resource %llx - %llx cannot be added\n", |
| 45 | (unsigned long long)res->start, (unsigned long long)res->end); |
| 46 | kfree(res); |
| 47 | res = NULL; |
| 48 | } |
| 49 | return res; |
| 50 | } |
| 51 | |
| 52 | static void release_memory_resource(struct resource *res) |
| 53 | { |
| 54 | if (!res) |
| 55 | return; |
| 56 | release_resource(res); |
| 57 | kfree(res); |
| 58 | return; |
| 59 | } |
| 60 | |
Keith Mannthey | 5394702 | 2006-09-30 23:27:08 -0700 | [diff] [blame] | 61 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame^] | 62 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
| 63 | static void get_page_bootmem(unsigned long info, struct page *page, int magic) |
| 64 | { |
| 65 | atomic_set(&page->_mapcount, magic); |
| 66 | SetPagePrivate(page); |
| 67 | set_page_private(page, info); |
| 68 | atomic_inc(&page->_count); |
| 69 | } |
| 70 | |
| 71 | void put_page_bootmem(struct page *page) |
| 72 | { |
| 73 | int magic; |
| 74 | |
| 75 | magic = atomic_read(&page->_mapcount); |
| 76 | BUG_ON(magic >= -1); |
| 77 | |
| 78 | if (atomic_dec_return(&page->_count) == 1) { |
| 79 | ClearPagePrivate(page); |
| 80 | set_page_private(page, 0); |
| 81 | reset_page_mapcount(page); |
| 82 | __free_pages_bootmem(page, 0); |
| 83 | } |
| 84 | |
| 85 | } |
| 86 | |
| 87 | void register_page_bootmem_info_section(unsigned long start_pfn) |
| 88 | { |
| 89 | unsigned long *usemap, mapsize, section_nr, i; |
| 90 | struct mem_section *ms; |
| 91 | struct page *page, *memmap; |
| 92 | |
| 93 | if (!pfn_valid(start_pfn)) |
| 94 | return; |
| 95 | |
| 96 | section_nr = pfn_to_section_nr(start_pfn); |
| 97 | ms = __nr_to_section(section_nr); |
| 98 | |
| 99 | /* Get section's memmap address */ |
| 100 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); |
| 101 | |
| 102 | /* |
| 103 | * Get page for the memmap's phys address |
| 104 | * XXX: need more consideration for sparse_vmemmap... |
| 105 | */ |
| 106 | page = virt_to_page(memmap); |
| 107 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; |
| 108 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; |
| 109 | |
| 110 | /* remember memmap's page */ |
| 111 | for (i = 0; i < mapsize; i++, page++) |
| 112 | get_page_bootmem(section_nr, page, SECTION_INFO); |
| 113 | |
| 114 | usemap = __nr_to_section(section_nr)->pageblock_flags; |
| 115 | page = virt_to_page(usemap); |
| 116 | |
| 117 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; |
| 118 | |
| 119 | for (i = 0; i < mapsize; i++, page++) |
| 120 | get_page_bootmem(section_nr, page, MIX_INFO); |
| 121 | |
| 122 | } |
| 123 | |
| 124 | void register_page_bootmem_info_node(struct pglist_data *pgdat) |
| 125 | { |
| 126 | unsigned long i, pfn, end_pfn, nr_pages; |
| 127 | int node = pgdat->node_id; |
| 128 | struct page *page; |
| 129 | struct zone *zone; |
| 130 | |
| 131 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; |
| 132 | page = virt_to_page(pgdat); |
| 133 | |
| 134 | for (i = 0; i < nr_pages; i++, page++) |
| 135 | get_page_bootmem(node, page, NODE_INFO); |
| 136 | |
| 137 | zone = &pgdat->node_zones[0]; |
| 138 | for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) { |
| 139 | if (zone->wait_table) { |
| 140 | nr_pages = zone->wait_table_hash_nr_entries |
| 141 | * sizeof(wait_queue_head_t); |
| 142 | nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT; |
| 143 | page = virt_to_page(zone->wait_table); |
| 144 | |
| 145 | for (i = 0; i < nr_pages; i++, page++) |
| 146 | get_page_bootmem(node, page, NODE_INFO); |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | pfn = pgdat->node_start_pfn; |
| 151 | end_pfn = pfn + pgdat->node_spanned_pages; |
| 152 | |
| 153 | /* register_section info */ |
| 154 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) |
| 155 | register_page_bootmem_info_section(pfn); |
| 156 | |
| 157 | } |
| 158 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ |
| 159 | |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 160 | static int __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 161 | { |
| 162 | struct pglist_data *pgdat = zone->zone_pgdat; |
| 163 | int nr_pages = PAGES_PER_SECTION; |
| 164 | int nid = pgdat->node_id; |
| 165 | int zone_type; |
| 166 | |
| 167 | zone_type = zone - pgdat->node_zones; |
Yasunori Goto | 13466c8 | 2007-06-01 00:46:53 -0700 | [diff] [blame] | 168 | if (!zone->wait_table) { |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 169 | int ret = 0; |
Dave Hansen | a2f3aa02 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 170 | ret = init_currently_empty_zone(zone, phys_start_pfn, |
| 171 | nr_pages, MEMMAP_HOTPLUG); |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 172 | if (ret < 0) |
| 173 | return ret; |
| 174 | } |
Dave Hansen | a2f3aa02 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 175 | memmap_init_zone(nr_pages, nid, zone_type, |
| 176 | phys_start_pfn, MEMMAP_HOTPLUG); |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 177 | return 0; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 178 | } |
| 179 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 180 | static int __add_section(struct zone *zone, unsigned long phys_start_pfn) |
| 181 | { |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 182 | int nr_pages = PAGES_PER_SECTION; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 183 | int ret; |
| 184 | |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 185 | if (pfn_valid(phys_start_pfn)) |
| 186 | return -EEXIST; |
| 187 | |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 188 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 189 | |
| 190 | if (ret < 0) |
| 191 | return ret; |
| 192 | |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 193 | ret = __add_zone(zone, phys_start_pfn); |
| 194 | |
| 195 | if (ret < 0) |
| 196 | return ret; |
| 197 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 198 | return register_new_memory(__pfn_to_section(phys_start_pfn)); |
| 199 | } |
| 200 | |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 201 | static int __remove_section(struct zone *zone, struct mem_section *ms) |
| 202 | { |
| 203 | unsigned long flags; |
| 204 | struct pglist_data *pgdat = zone->zone_pgdat; |
| 205 | int ret = -EINVAL; |
| 206 | |
| 207 | if (!valid_section(ms)) |
| 208 | return ret; |
| 209 | |
| 210 | ret = unregister_memory_section(ms); |
| 211 | if (ret) |
| 212 | return ret; |
| 213 | |
| 214 | pgdat_resize_lock(pgdat, &flags); |
| 215 | sparse_remove_one_section(zone, ms); |
| 216 | pgdat_resize_unlock(pgdat, &flags); |
| 217 | return 0; |
| 218 | } |
| 219 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 220 | /* |
| 221 | * Reasonably generic function for adding memory. It is |
| 222 | * expected that archs that support memory hotplug will |
| 223 | * call this function after deciding the zone to which to |
| 224 | * add the new pages. |
| 225 | */ |
| 226 | int __add_pages(struct zone *zone, unsigned long phys_start_pfn, |
| 227 | unsigned long nr_pages) |
| 228 | { |
| 229 | unsigned long i; |
| 230 | int err = 0; |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 231 | int start_sec, end_sec; |
| 232 | /* during initialize mem_map, align hot-added range to section */ |
| 233 | start_sec = pfn_to_section_nr(phys_start_pfn); |
| 234 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 235 | |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 236 | for (i = start_sec; i <= end_sec; i++) { |
| 237 | err = __add_section(zone, i << PFN_SECTION_SHIFT); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 238 | |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 239 | /* |
Simon Arlott | 183ff22 | 2007-10-20 01:27:18 +0200 | [diff] [blame] | 240 | * EEXIST is finally dealt with by ioresource collision |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 241 | * check. see add_memory() => register_memory_resource() |
| 242 | * Warning will be printed if there is collision. |
Joel H Schopp | bed120c | 2006-05-01 12:16:11 -0700 | [diff] [blame] | 243 | */ |
| 244 | if (err && (err != -EEXIST)) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 245 | break; |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 246 | err = 0; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | return err; |
| 250 | } |
Joel H Schopp | bed120c | 2006-05-01 12:16:11 -0700 | [diff] [blame] | 251 | EXPORT_SYMBOL_GPL(__add_pages); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 252 | |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 253 | /** |
| 254 | * __remove_pages() - remove sections of pages from a zone |
| 255 | * @zone: zone from which pages need to be removed |
| 256 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) |
| 257 | * @nr_pages: number of pages to remove (must be multiple of section size) |
| 258 | * |
| 259 | * Generic helper function to remove section mappings and sysfs entries |
| 260 | * for the section of the memory we are removing. Caller needs to make |
| 261 | * sure that pages are marked reserved and zones are adjust properly by |
| 262 | * calling offline_pages(). |
| 263 | */ |
| 264 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, |
| 265 | unsigned long nr_pages) |
| 266 | { |
| 267 | unsigned long i, ret = 0; |
| 268 | int sections_to_remove; |
| 269 | |
| 270 | /* |
| 271 | * We can only remove entire sections |
| 272 | */ |
| 273 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); |
| 274 | BUG_ON(nr_pages % PAGES_PER_SECTION); |
| 275 | |
| 276 | release_mem_region(phys_start_pfn << PAGE_SHIFT, nr_pages * PAGE_SIZE); |
| 277 | |
| 278 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
| 279 | for (i = 0; i < sections_to_remove; i++) { |
| 280 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; |
| 281 | ret = __remove_section(zone, __pfn_to_section(pfn)); |
| 282 | if (ret) |
| 283 | break; |
| 284 | } |
| 285 | return ret; |
| 286 | } |
| 287 | EXPORT_SYMBOL_GPL(__remove_pages); |
| 288 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 289 | static void grow_zone_span(struct zone *zone, |
| 290 | unsigned long start_pfn, unsigned long end_pfn) |
| 291 | { |
| 292 | unsigned long old_zone_end_pfn; |
| 293 | |
| 294 | zone_span_writelock(zone); |
| 295 | |
| 296 | old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; |
| 297 | if (start_pfn < zone->zone_start_pfn) |
| 298 | zone->zone_start_pfn = start_pfn; |
| 299 | |
Yasunori Goto | 25a6df9 | 2006-05-30 21:25:42 -0700 | [diff] [blame] | 300 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - |
| 301 | zone->zone_start_pfn; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 302 | |
| 303 | zone_span_writeunlock(zone); |
| 304 | } |
| 305 | |
| 306 | static void grow_pgdat_span(struct pglist_data *pgdat, |
| 307 | unsigned long start_pfn, unsigned long end_pfn) |
| 308 | { |
| 309 | unsigned long old_pgdat_end_pfn = |
| 310 | pgdat->node_start_pfn + pgdat->node_spanned_pages; |
| 311 | |
| 312 | if (start_pfn < pgdat->node_start_pfn) |
| 313 | pgdat->node_start_pfn = start_pfn; |
| 314 | |
Yasunori Goto | 25a6df9 | 2006-05-30 21:25:42 -0700 | [diff] [blame] | 315 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - |
| 316 | pgdat->node_start_pfn; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 317 | } |
| 318 | |
Jeremy Fitzhardinge | 180c06e | 2008-04-28 02:12:03 -0700 | [diff] [blame] | 319 | void online_page(struct page *page) |
| 320 | { |
| 321 | totalram_pages++; |
| 322 | num_physpages++; |
| 323 | |
| 324 | #ifdef CONFIG_HIGHMEM |
| 325 | if (PageHighMem(page)) |
| 326 | totalhigh_pages++; |
| 327 | #endif |
| 328 | |
| 329 | #ifdef CONFIG_FLATMEM |
| 330 | max_mapnr = max(page_to_pfn(page), max_mapnr); |
| 331 | #endif |
| 332 | |
| 333 | ClearPageReserved(page); |
| 334 | init_page_count(page); |
| 335 | __free_page(page); |
| 336 | } |
| 337 | |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 338 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
| 339 | void *arg) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 340 | { |
| 341 | unsigned long i; |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 342 | unsigned long onlined_pages = *(unsigned long *)arg; |
| 343 | struct page *page; |
| 344 | if (PageReserved(pfn_to_page(start_pfn))) |
| 345 | for (i = 0; i < nr_pages; i++) { |
| 346 | page = pfn_to_page(start_pfn + i); |
| 347 | online_page(page); |
| 348 | onlined_pages++; |
| 349 | } |
| 350 | *(unsigned long *)arg = onlined_pages; |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | |
| 355 | int online_pages(unsigned long pfn, unsigned long nr_pages) |
| 356 | { |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 357 | unsigned long flags; |
| 358 | unsigned long onlined_pages = 0; |
| 359 | struct zone *zone; |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 360 | int need_zonelists_rebuild = 0; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 361 | int nid; |
| 362 | int ret; |
| 363 | struct memory_notify arg; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 364 | |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 365 | arg.start_pfn = pfn; |
| 366 | arg.nr_pages = nr_pages; |
| 367 | arg.status_change_nid = -1; |
| 368 | |
| 369 | nid = page_to_nid(pfn_to_page(pfn)); |
| 370 | if (node_present_pages(nid) == 0) |
| 371 | arg.status_change_nid = nid; |
| 372 | |
| 373 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
| 374 | ret = notifier_to_errno(ret); |
| 375 | if (ret) { |
| 376 | memory_notify(MEM_CANCEL_ONLINE, &arg); |
| 377 | return ret; |
| 378 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 379 | /* |
| 380 | * This doesn't need a lock to do pfn_to_page(). |
| 381 | * The section can't be removed here because of the |
Daniel Walker | da19cbc | 2008-02-04 23:35:47 -0800 | [diff] [blame] | 382 | * memory_block->state_mutex. |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 383 | */ |
| 384 | zone = page_zone(pfn_to_page(pfn)); |
| 385 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
| 386 | grow_zone_span(zone, pfn, pfn + nr_pages); |
| 387 | grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages); |
| 388 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
| 389 | |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 390 | /* |
| 391 | * If this zone is not populated, then it is not in zonelist. |
| 392 | * This means the page allocator ignores this zone. |
| 393 | * So, zonelist must be updated after online. |
| 394 | */ |
| 395 | if (!populated_zone(zone)) |
| 396 | need_zonelists_rebuild = 1; |
| 397 | |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 398 | walk_memory_resource(pfn, nr_pages, &onlined_pages, |
| 399 | online_pages_range); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 400 | zone->present_pages += onlined_pages; |
Yasunori Goto | f2937be | 2006-03-09 17:33:51 -0800 | [diff] [blame] | 401 | zone->zone_pgdat->node_present_pages += onlined_pages; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 402 | |
Dave Hansen | 61b1399 | 2005-10-29 18:16:56 -0700 | [diff] [blame] | 403 | setup_per_zone_pages_min(); |
Christoph Lameter | 7ea1530 | 2007-10-16 01:25:29 -0700 | [diff] [blame] | 404 | if (onlined_pages) { |
| 405 | kswapd_run(zone_to_nid(zone)); |
| 406 | node_set_state(zone_to_nid(zone), N_HIGH_MEMORY); |
| 407 | } |
Dave Hansen | 61b1399 | 2005-10-29 18:16:56 -0700 | [diff] [blame] | 408 | |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 409 | if (need_zonelists_rebuild) |
| 410 | build_all_zonelists(); |
KAMEZAWA Hiroyuki | 5a4d436 | 2006-06-23 02:03:47 -0700 | [diff] [blame] | 411 | vm_total_pages = nr_free_pagecache_pages(); |
Chandra Seetharaman | 2d1d43f | 2006-09-29 02:01:25 -0700 | [diff] [blame] | 412 | writeback_set_ratelimit(); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 413 | |
| 414 | if (onlined_pages) |
| 415 | memory_notify(MEM_ONLINE, &arg); |
| 416 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 417 | return 0; |
| 418 | } |
Keith Mannthey | 5394702 | 2006-09-30 23:27:08 -0700 | [diff] [blame] | 419 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 420 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 421 | static pg_data_t *hotadd_new_pgdat(int nid, u64 start) |
| 422 | { |
| 423 | struct pglist_data *pgdat; |
| 424 | unsigned long zones_size[MAX_NR_ZONES] = {0}; |
| 425 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; |
| 426 | unsigned long start_pfn = start >> PAGE_SHIFT; |
| 427 | |
| 428 | pgdat = arch_alloc_nodedata(nid); |
| 429 | if (!pgdat) |
| 430 | return NULL; |
| 431 | |
| 432 | arch_refresh_nodedata(nid, pgdat); |
| 433 | |
| 434 | /* we can use NODE_DATA(nid) from here */ |
| 435 | |
| 436 | /* init node's zones as empty zones, we don't have any present pages.*/ |
| 437 | free_area_init_node(nid, pgdat, zones_size, start_pfn, zholes_size); |
| 438 | |
| 439 | return pgdat; |
| 440 | } |
| 441 | |
| 442 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) |
| 443 | { |
| 444 | arch_refresh_nodedata(nid, NULL); |
| 445 | arch_free_nodedata(pgdat); |
| 446 | return; |
| 447 | } |
| 448 | |
KAMEZAWA Hiroyuki | 0a54703 | 2006-06-27 02:53:35 -0700 | [diff] [blame] | 449 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 450 | int add_memory(int nid, u64 start, u64 size) |
| 451 | { |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 452 | pg_data_t *pgdat = NULL; |
| 453 | int new_pgdat = 0; |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 454 | struct resource *res; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 455 | int ret; |
| 456 | |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 457 | res = register_memory_resource(start, size); |
| 458 | if (!res) |
| 459 | return -EEXIST; |
| 460 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 461 | if (!node_online(nid)) { |
| 462 | pgdat = hotadd_new_pgdat(nid, start); |
| 463 | if (!pgdat) |
| 464 | return -ENOMEM; |
| 465 | new_pgdat = 1; |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 466 | } |
| 467 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 468 | /* call arch's memory hotadd */ |
| 469 | ret = arch_add_memory(nid, start, size); |
| 470 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 471 | if (ret < 0) |
| 472 | goto error; |
| 473 | |
Yasunori Goto | 0fc4415 | 2006-06-27 02:53:38 -0700 | [diff] [blame] | 474 | /* we online node here. we can't roll back from here. */ |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 475 | node_set_online(nid); |
| 476 | |
Paul Jackson | 38837fc | 2006-09-29 02:01:16 -0700 | [diff] [blame] | 477 | cpuset_track_online_nodes(); |
| 478 | |
Yasunori Goto | 0fc4415 | 2006-06-27 02:53:38 -0700 | [diff] [blame] | 479 | if (new_pgdat) { |
| 480 | ret = register_one_node(nid); |
| 481 | /* |
| 482 | * If sysfs file of new node can't create, cpu on the node |
| 483 | * can't be hot-added. There is no rollback way now. |
| 484 | * So, check by BUG_ON() to catch it reluctantly.. |
| 485 | */ |
| 486 | BUG_ON(ret); |
| 487 | } |
| 488 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 489 | return ret; |
| 490 | error: |
| 491 | /* rollback pgdat allocation and others */ |
| 492 | if (new_pgdat) |
| 493 | rollback_node_hotadd(nid, pgdat); |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 494 | if (res) |
| 495 | release_memory_resource(res); |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 496 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 497 | return ret; |
| 498 | } |
| 499 | EXPORT_SYMBOL_GPL(add_memory); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 500 | |
| 501 | #ifdef CONFIG_MEMORY_HOTREMOVE |
| 502 | /* |
| 503 | * Confirm all pages in a range [start, end) is belongs to the same zone. |
| 504 | */ |
| 505 | static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn) |
| 506 | { |
| 507 | unsigned long pfn; |
| 508 | struct zone *zone = NULL; |
| 509 | struct page *page; |
| 510 | int i; |
| 511 | for (pfn = start_pfn; |
| 512 | pfn < end_pfn; |
| 513 | pfn += MAX_ORDER_NR_PAGES) { |
| 514 | i = 0; |
| 515 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ |
| 516 | while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i)) |
| 517 | i++; |
| 518 | if (i == MAX_ORDER_NR_PAGES) |
| 519 | continue; |
| 520 | page = pfn_to_page(pfn + i); |
| 521 | if (zone && page_zone(page) != zone) |
| 522 | return 0; |
| 523 | zone = page_zone(page); |
| 524 | } |
| 525 | return 1; |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * Scanning pfn is much easier than scanning lru list. |
| 530 | * Scan pfn from start to end and Find LRU page. |
| 531 | */ |
| 532 | int scan_lru_pages(unsigned long start, unsigned long end) |
| 533 | { |
| 534 | unsigned long pfn; |
| 535 | struct page *page; |
| 536 | for (pfn = start; pfn < end; pfn++) { |
| 537 | if (pfn_valid(pfn)) { |
| 538 | page = pfn_to_page(pfn); |
| 539 | if (PageLRU(page)) |
| 540 | return pfn; |
| 541 | } |
| 542 | } |
| 543 | return 0; |
| 544 | } |
| 545 | |
| 546 | static struct page * |
| 547 | hotremove_migrate_alloc(struct page *page, |
| 548 | unsigned long private, |
| 549 | int **x) |
| 550 | { |
| 551 | /* This should be improoooooved!! */ |
| 552 | return alloc_page(GFP_HIGHUSER_PAGECACHE); |
| 553 | } |
| 554 | |
| 555 | |
| 556 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
| 557 | static int |
| 558 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) |
| 559 | { |
| 560 | unsigned long pfn; |
| 561 | struct page *page; |
| 562 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; |
| 563 | int not_managed = 0; |
| 564 | int ret = 0; |
| 565 | LIST_HEAD(source); |
| 566 | |
| 567 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { |
| 568 | if (!pfn_valid(pfn)) |
| 569 | continue; |
| 570 | page = pfn_to_page(pfn); |
| 571 | if (!page_count(page)) |
| 572 | continue; |
| 573 | /* |
| 574 | * We can skip free pages. And we can only deal with pages on |
| 575 | * LRU. |
| 576 | */ |
| 577 | ret = isolate_lru_page(page, &source); |
| 578 | if (!ret) { /* Success */ |
| 579 | move_pages--; |
| 580 | } else { |
| 581 | /* Becasue we don't have big zone->lock. we should |
| 582 | check this again here. */ |
| 583 | if (page_count(page)) |
| 584 | not_managed++; |
| 585 | #ifdef CONFIG_DEBUG_VM |
| 586 | printk(KERN_INFO "removing from LRU failed" |
| 587 | " %lx/%d/%lx\n", |
| 588 | pfn, page_count(page), page->flags); |
| 589 | #endif |
| 590 | } |
| 591 | } |
| 592 | ret = -EBUSY; |
| 593 | if (not_managed) { |
| 594 | if (!list_empty(&source)) |
| 595 | putback_lru_pages(&source); |
| 596 | goto out; |
| 597 | } |
| 598 | ret = 0; |
| 599 | if (list_empty(&source)) |
| 600 | goto out; |
| 601 | /* this function returns # of failed pages */ |
| 602 | ret = migrate_pages(&source, hotremove_migrate_alloc, 0); |
| 603 | |
| 604 | out: |
| 605 | return ret; |
| 606 | } |
| 607 | |
| 608 | /* |
| 609 | * remove from free_area[] and mark all as Reserved. |
| 610 | */ |
| 611 | static int |
| 612 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, |
| 613 | void *data) |
| 614 | { |
| 615 | __offline_isolated_pages(start, start + nr_pages); |
| 616 | return 0; |
| 617 | } |
| 618 | |
| 619 | static void |
| 620 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) |
| 621 | { |
| 622 | walk_memory_resource(start_pfn, end_pfn - start_pfn, NULL, |
| 623 | offline_isolated_pages_cb); |
| 624 | } |
| 625 | |
| 626 | /* |
| 627 | * Check all pages in range, recoreded as memory resource, are isolated. |
| 628 | */ |
| 629 | static int |
| 630 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, |
| 631 | void *data) |
| 632 | { |
| 633 | int ret; |
| 634 | long offlined = *(long *)data; |
| 635 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages); |
| 636 | offlined = nr_pages; |
| 637 | if (!ret) |
| 638 | *(long *)data += offlined; |
| 639 | return ret; |
| 640 | } |
| 641 | |
| 642 | static long |
| 643 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) |
| 644 | { |
| 645 | long offlined = 0; |
| 646 | int ret; |
| 647 | |
| 648 | ret = walk_memory_resource(start_pfn, end_pfn - start_pfn, &offlined, |
| 649 | check_pages_isolated_cb); |
| 650 | if (ret < 0) |
| 651 | offlined = (long)ret; |
| 652 | return offlined; |
| 653 | } |
| 654 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 655 | int offline_pages(unsigned long start_pfn, |
| 656 | unsigned long end_pfn, unsigned long timeout) |
| 657 | { |
| 658 | unsigned long pfn, nr_pages, expire; |
| 659 | long offlined_pages; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 660 | int ret, drain, retry_max, node; |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 661 | struct zone *zone; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 662 | struct memory_notify arg; |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 663 | |
| 664 | BUG_ON(start_pfn >= end_pfn); |
| 665 | /* at least, alignment against pageblock is necessary */ |
| 666 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) |
| 667 | return -EINVAL; |
| 668 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) |
| 669 | return -EINVAL; |
| 670 | /* This makes hotplug much easier...and readable. |
| 671 | we assume this for now. .*/ |
| 672 | if (!test_pages_in_a_zone(start_pfn, end_pfn)) |
| 673 | return -EINVAL; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 674 | |
| 675 | zone = page_zone(pfn_to_page(start_pfn)); |
| 676 | node = zone_to_nid(zone); |
| 677 | nr_pages = end_pfn - start_pfn; |
| 678 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 679 | /* set above range as isolated */ |
| 680 | ret = start_isolate_page_range(start_pfn, end_pfn); |
| 681 | if (ret) |
| 682 | return ret; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 683 | |
| 684 | arg.start_pfn = start_pfn; |
| 685 | arg.nr_pages = nr_pages; |
| 686 | arg.status_change_nid = -1; |
| 687 | if (nr_pages >= node_present_pages(node)) |
| 688 | arg.status_change_nid = node; |
| 689 | |
| 690 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); |
| 691 | ret = notifier_to_errno(ret); |
| 692 | if (ret) |
| 693 | goto failed_removal; |
| 694 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 695 | pfn = start_pfn; |
| 696 | expire = jiffies + timeout; |
| 697 | drain = 0; |
| 698 | retry_max = 5; |
| 699 | repeat: |
| 700 | /* start memory hot removal */ |
| 701 | ret = -EAGAIN; |
| 702 | if (time_after(jiffies, expire)) |
| 703 | goto failed_removal; |
| 704 | ret = -EINTR; |
| 705 | if (signal_pending(current)) |
| 706 | goto failed_removal; |
| 707 | ret = 0; |
| 708 | if (drain) { |
| 709 | lru_add_drain_all(); |
| 710 | flush_scheduled_work(); |
| 711 | cond_resched(); |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 712 | drain_all_pages(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 713 | } |
| 714 | |
| 715 | pfn = scan_lru_pages(start_pfn, end_pfn); |
| 716 | if (pfn) { /* We have page on LRU */ |
| 717 | ret = do_migrate_range(pfn, end_pfn); |
| 718 | if (!ret) { |
| 719 | drain = 1; |
| 720 | goto repeat; |
| 721 | } else { |
| 722 | if (ret < 0) |
| 723 | if (--retry_max == 0) |
| 724 | goto failed_removal; |
| 725 | yield(); |
| 726 | drain = 1; |
| 727 | goto repeat; |
| 728 | } |
| 729 | } |
| 730 | /* drain all zone's lru pagevec, this is asyncronous... */ |
| 731 | lru_add_drain_all(); |
| 732 | flush_scheduled_work(); |
| 733 | yield(); |
| 734 | /* drain pcp pages , this is synchrouns. */ |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 735 | drain_all_pages(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 736 | /* check again */ |
| 737 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); |
| 738 | if (offlined_pages < 0) { |
| 739 | ret = -EBUSY; |
| 740 | goto failed_removal; |
| 741 | } |
| 742 | printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages); |
| 743 | /* Ok, all of our target is islaoted. |
| 744 | We cannot do rollback at this point. */ |
| 745 | offline_isolated_pages(start_pfn, end_pfn); |
KAMEZAWA Hiroyuki | dbc0e4c | 2007-11-14 16:59:12 -0800 | [diff] [blame] | 746 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
| 747 | undo_isolate_page_range(start_pfn, end_pfn); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 748 | /* removal success */ |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 749 | zone->present_pages -= offlined_pages; |
| 750 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
| 751 | totalram_pages -= offlined_pages; |
| 752 | num_physpages -= offlined_pages; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 753 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 754 | vm_total_pages = nr_free_pagecache_pages(); |
| 755 | writeback_set_ratelimit(); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 756 | |
| 757 | memory_notify(MEM_OFFLINE, &arg); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 758 | return 0; |
| 759 | |
| 760 | failed_removal: |
| 761 | printk(KERN_INFO "memory offlining %lx to %lx failed\n", |
| 762 | start_pfn, end_pfn); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 763 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 764 | /* pushback to free area */ |
| 765 | undo_isolate_page_range(start_pfn, end_pfn); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 766 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 767 | return ret; |
| 768 | } |
KAMEZAWA Hiroyuki | 48e9419 | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 769 | #else |
| 770 | int remove_memory(u64 start, u64 size) |
| 771 | { |
| 772 | return -EINVAL; |
| 773 | } |
| 774 | EXPORT_SYMBOL_GPL(remove_memory); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 775 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |