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> |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 25 | #include <linux/delay.h> |
| 26 | #include <linux/migrate.h> |
| 27 | #include <linux/page-isolation.h> |
Badari Pulavarty | 7108878 | 2008-10-18 20:25:58 -0700 | [diff] [blame] | 28 | #include <linux/pfn.h> |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 29 | #include <linux/suspend.h> |
KOSAKI Motohiro | 6d9c285 | 2009-12-14 17:58:11 -0800 | [diff] [blame] | 30 | #include <linux/mm_inline.h> |
akpm@linux-foundation.org | d96ae53 | 2010-03-05 13:41:58 -0800 | [diff] [blame] | 31 | #include <linux/firmware-map.h> |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 32 | |
| 33 | #include <asm/tlbflush.h> |
| 34 | |
Adrian Bunk | 1e5ad9a | 2008-04-28 20:40:08 +0300 | [diff] [blame] | 35 | #include "internal.h" |
| 36 | |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 37 | DEFINE_MUTEX(mem_hotplug_mutex); |
| 38 | |
| 39 | void lock_memory_hotplug(void) |
| 40 | { |
| 41 | mutex_lock(&mem_hotplug_mutex); |
| 42 | |
| 43 | /* for exclusive hibernation if CONFIG_HIBERNATION=y */ |
| 44 | lock_system_sleep(); |
| 45 | } |
| 46 | |
| 47 | void unlock_memory_hotplug(void) |
| 48 | { |
| 49 | unlock_system_sleep(); |
| 50 | mutex_unlock(&mem_hotplug_mutex); |
| 51 | } |
| 52 | |
| 53 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 54 | /* add this memory to iomem resource */ |
| 55 | static struct resource *register_memory_resource(u64 start, u64 size) |
| 56 | { |
| 57 | struct resource *res; |
| 58 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
| 59 | BUG_ON(!res); |
| 60 | |
| 61 | res->name = "System RAM"; |
| 62 | res->start = start; |
| 63 | res->end = start + size - 1; |
Yasunori Goto | 887c3cb | 2007-11-14 16:59:20 -0800 | [diff] [blame] | 64 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 65 | if (request_resource(&iomem_resource, res) < 0) { |
| 66 | printk("System RAM resource %llx - %llx cannot be added\n", |
| 67 | (unsigned long long)res->start, (unsigned long long)res->end); |
| 68 | kfree(res); |
| 69 | res = NULL; |
| 70 | } |
| 71 | return res; |
| 72 | } |
| 73 | |
| 74 | static void release_memory_resource(struct resource *res) |
| 75 | { |
| 76 | if (!res) |
| 77 | return; |
| 78 | release_resource(res); |
| 79 | kfree(res); |
| 80 | return; |
| 81 | } |
| 82 | |
Keith Mannthey | 5394702 | 2006-09-30 23:27:08 -0700 | [diff] [blame] | 83 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 84 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
Yasunori Goto | af370fb | 2008-07-23 21:28:17 -0700 | [diff] [blame] | 85 | static void get_page_bootmem(unsigned long info, struct page *page, int type) |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 86 | { |
Yasunori Goto | af370fb | 2008-07-23 21:28:17 -0700 | [diff] [blame] | 87 | atomic_set(&page->_mapcount, type); |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 88 | SetPagePrivate(page); |
| 89 | set_page_private(page, info); |
| 90 | atomic_inc(&page->_count); |
| 91 | } |
| 92 | |
Rakib Mullick | 23ce932 | 2009-12-14 17:59:44 -0800 | [diff] [blame] | 93 | /* reference to __meminit __free_pages_bootmem is valid |
| 94 | * so use __ref to tell modpost not to generate a warning */ |
| 95 | void __ref put_page_bootmem(struct page *page) |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 96 | { |
Yasunori Goto | af370fb | 2008-07-23 21:28:17 -0700 | [diff] [blame] | 97 | int type; |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 98 | |
Yasunori Goto | af370fb | 2008-07-23 21:28:17 -0700 | [diff] [blame] | 99 | type = atomic_read(&page->_mapcount); |
| 100 | BUG_ON(type >= -1); |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 101 | |
| 102 | if (atomic_dec_return(&page->_count) == 1) { |
| 103 | ClearPagePrivate(page); |
| 104 | set_page_private(page, 0); |
| 105 | reset_page_mapcount(page); |
| 106 | __free_pages_bootmem(page, 0); |
| 107 | } |
| 108 | |
| 109 | } |
| 110 | |
Adrian Bunk | d92bc31 | 2008-07-23 21:28:12 -0700 | [diff] [blame] | 111 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 112 | { |
| 113 | unsigned long *usemap, mapsize, section_nr, i; |
| 114 | struct mem_section *ms; |
| 115 | struct page *page, *memmap; |
| 116 | |
| 117 | if (!pfn_valid(start_pfn)) |
| 118 | return; |
| 119 | |
| 120 | section_nr = pfn_to_section_nr(start_pfn); |
| 121 | ms = __nr_to_section(section_nr); |
| 122 | |
| 123 | /* Get section's memmap address */ |
| 124 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); |
| 125 | |
| 126 | /* |
| 127 | * Get page for the memmap's phys address |
| 128 | * XXX: need more consideration for sparse_vmemmap... |
| 129 | */ |
| 130 | page = virt_to_page(memmap); |
| 131 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; |
| 132 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; |
| 133 | |
| 134 | /* remember memmap's page */ |
| 135 | for (i = 0; i < mapsize; i++, page++) |
| 136 | get_page_bootmem(section_nr, page, SECTION_INFO); |
| 137 | |
| 138 | usemap = __nr_to_section(section_nr)->pageblock_flags; |
| 139 | page = virt_to_page(usemap); |
| 140 | |
| 141 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; |
| 142 | |
| 143 | for (i = 0; i < mapsize; i++, page++) |
Yasunori Goto | af370fb | 2008-07-23 21:28:17 -0700 | [diff] [blame] | 144 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 145 | |
| 146 | } |
| 147 | |
| 148 | void register_page_bootmem_info_node(struct pglist_data *pgdat) |
| 149 | { |
| 150 | unsigned long i, pfn, end_pfn, nr_pages; |
| 151 | int node = pgdat->node_id; |
| 152 | struct page *page; |
| 153 | struct zone *zone; |
| 154 | |
| 155 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; |
| 156 | page = virt_to_page(pgdat); |
| 157 | |
| 158 | for (i = 0; i < nr_pages; i++, page++) |
| 159 | get_page_bootmem(node, page, NODE_INFO); |
| 160 | |
| 161 | zone = &pgdat->node_zones[0]; |
| 162 | for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) { |
| 163 | if (zone->wait_table) { |
| 164 | nr_pages = zone->wait_table_hash_nr_entries |
| 165 | * sizeof(wait_queue_head_t); |
| 166 | nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT; |
| 167 | page = virt_to_page(zone->wait_table); |
| 168 | |
| 169 | for (i = 0; i < nr_pages; i++, page++) |
| 170 | get_page_bootmem(node, page, NODE_INFO); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | pfn = pgdat->node_start_pfn; |
| 175 | end_pfn = pfn + pgdat->node_spanned_pages; |
| 176 | |
| 177 | /* register_section info */ |
| 178 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) |
| 179 | register_page_bootmem_info_section(pfn); |
| 180 | |
| 181 | } |
| 182 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ |
| 183 | |
Heiko Carstens | 76cdd58 | 2008-05-14 16:05:52 -0700 | [diff] [blame] | 184 | static void grow_zone_span(struct zone *zone, unsigned long start_pfn, |
| 185 | unsigned long end_pfn) |
| 186 | { |
| 187 | unsigned long old_zone_end_pfn; |
| 188 | |
| 189 | zone_span_writelock(zone); |
| 190 | |
| 191 | old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; |
| 192 | if (start_pfn < zone->zone_start_pfn) |
| 193 | zone->zone_start_pfn = start_pfn; |
| 194 | |
| 195 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - |
| 196 | zone->zone_start_pfn; |
| 197 | |
| 198 | zone_span_writeunlock(zone); |
| 199 | } |
| 200 | |
| 201 | static void grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, |
| 202 | unsigned long end_pfn) |
| 203 | { |
| 204 | unsigned long old_pgdat_end_pfn = |
| 205 | pgdat->node_start_pfn + pgdat->node_spanned_pages; |
| 206 | |
| 207 | if (start_pfn < pgdat->node_start_pfn) |
| 208 | pgdat->node_start_pfn = start_pfn; |
| 209 | |
| 210 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - |
| 211 | pgdat->node_start_pfn; |
| 212 | } |
| 213 | |
Al Viro | 3116848 | 2008-11-22 17:33:24 +0000 | [diff] [blame] | 214 | static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 215 | { |
| 216 | struct pglist_data *pgdat = zone->zone_pgdat; |
| 217 | int nr_pages = PAGES_PER_SECTION; |
| 218 | int nid = pgdat->node_id; |
| 219 | int zone_type; |
Heiko Carstens | 76cdd58 | 2008-05-14 16:05:52 -0700 | [diff] [blame] | 220 | unsigned long flags; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 221 | |
| 222 | zone_type = zone - pgdat->node_zones; |
Heiko Carstens | 76cdd58 | 2008-05-14 16:05:52 -0700 | [diff] [blame] | 223 | if (!zone->wait_table) { |
| 224 | int ret; |
| 225 | |
| 226 | ret = init_currently_empty_zone(zone, phys_start_pfn, |
| 227 | nr_pages, MEMMAP_HOTPLUG); |
| 228 | if (ret) |
| 229 | return ret; |
| 230 | } |
| 231 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
| 232 | grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages); |
| 233 | grow_pgdat_span(zone->zone_pgdat, phys_start_pfn, |
| 234 | phys_start_pfn + nr_pages); |
| 235 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
Dave Hansen | a2f3aa02 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 236 | memmap_init_zone(nr_pages, nid, zone_type, |
| 237 | phys_start_pfn, MEMMAP_HOTPLUG); |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 238 | return 0; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 239 | } |
| 240 | |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 241 | static int __meminit __add_section(int nid, struct zone *zone, |
| 242 | unsigned long phys_start_pfn) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 243 | { |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 244 | int nr_pages = PAGES_PER_SECTION; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 245 | int ret; |
| 246 | |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 247 | if (pfn_valid(phys_start_pfn)) |
| 248 | return -EEXIST; |
| 249 | |
Dave Hansen | 0b0acbec | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 250 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 251 | |
| 252 | if (ret < 0) |
| 253 | return ret; |
| 254 | |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 255 | ret = __add_zone(zone, phys_start_pfn); |
| 256 | |
| 257 | if (ret < 0) |
| 258 | return ret; |
| 259 | |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 260 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 261 | } |
| 262 | |
Yasunori Goto | 0c0a4a5 | 2008-04-28 02:13:34 -0700 | [diff] [blame] | 263 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 264 | static int __remove_section(struct zone *zone, struct mem_section *ms) |
| 265 | { |
| 266 | /* |
| 267 | * XXX: Freeing memmap with vmemmap is not implement yet. |
| 268 | * This should be removed later. |
| 269 | */ |
| 270 | return -EBUSY; |
| 271 | } |
| 272 | #else |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 273 | static int __remove_section(struct zone *zone, struct mem_section *ms) |
| 274 | { |
| 275 | unsigned long flags; |
| 276 | struct pglist_data *pgdat = zone->zone_pgdat; |
| 277 | int ret = -EINVAL; |
| 278 | |
| 279 | if (!valid_section(ms)) |
| 280 | return ret; |
| 281 | |
| 282 | ret = unregister_memory_section(ms); |
| 283 | if (ret) |
| 284 | return ret; |
| 285 | |
| 286 | pgdat_resize_lock(pgdat, &flags); |
| 287 | sparse_remove_one_section(zone, ms); |
| 288 | pgdat_resize_unlock(pgdat, &flags); |
| 289 | return 0; |
| 290 | } |
Yasunori Goto | 0c0a4a5 | 2008-04-28 02:13:34 -0700 | [diff] [blame] | 291 | #endif |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 292 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 293 | /* |
| 294 | * Reasonably generic function for adding memory. It is |
| 295 | * expected that archs that support memory hotplug will |
| 296 | * call this function after deciding the zone to which to |
| 297 | * add the new pages. |
| 298 | */ |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 299 | int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn, |
| 300 | unsigned long nr_pages) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 301 | { |
| 302 | unsigned long i; |
| 303 | int err = 0; |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 304 | int start_sec, end_sec; |
| 305 | /* during initialize mem_map, align hot-added range to section */ |
| 306 | start_sec = pfn_to_section_nr(phys_start_pfn); |
| 307 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 308 | |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 309 | for (i = start_sec; i <= end_sec; i++) { |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 310 | err = __add_section(nid, zone, i << PFN_SECTION_SHIFT); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 311 | |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 312 | /* |
Simon Arlott | 183ff22 | 2007-10-20 01:27:18 +0200 | [diff] [blame] | 313 | * EEXIST is finally dealt with by ioresource collision |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 314 | * check. see add_memory() => register_memory_resource() |
| 315 | * Warning will be printed if there is collision. |
Joel H Schopp | bed120c | 2006-05-01 12:16:11 -0700 | [diff] [blame] | 316 | */ |
| 317 | if (err && (err != -EEXIST)) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 318 | break; |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 319 | err = 0; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | return err; |
| 323 | } |
Joel H Schopp | bed120c | 2006-05-01 12:16:11 -0700 | [diff] [blame] | 324 | EXPORT_SYMBOL_GPL(__add_pages); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 325 | |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 326 | /** |
| 327 | * __remove_pages() - remove sections of pages from a zone |
| 328 | * @zone: zone from which pages need to be removed |
| 329 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) |
| 330 | * @nr_pages: number of pages to remove (must be multiple of section size) |
| 331 | * |
| 332 | * Generic helper function to remove section mappings and sysfs entries |
| 333 | * for the section of the memory we are removing. Caller needs to make |
| 334 | * sure that pages are marked reserved and zones are adjust properly by |
| 335 | * calling offline_pages(). |
| 336 | */ |
| 337 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, |
| 338 | unsigned long nr_pages) |
| 339 | { |
| 340 | unsigned long i, ret = 0; |
| 341 | int sections_to_remove; |
| 342 | |
| 343 | /* |
| 344 | * We can only remove entire sections |
| 345 | */ |
| 346 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); |
| 347 | BUG_ON(nr_pages % PAGES_PER_SECTION); |
| 348 | |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 349 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
| 350 | for (i = 0; i < sections_to_remove; i++) { |
| 351 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; |
Nathan Fontenot | de7f0cb | 2008-10-18 20:27:14 -0700 | [diff] [blame] | 352 | release_mem_region(pfn << PAGE_SHIFT, |
| 353 | PAGES_PER_SECTION << PAGE_SHIFT); |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 354 | ret = __remove_section(zone, __pfn_to_section(pfn)); |
| 355 | if (ret) |
| 356 | break; |
| 357 | } |
| 358 | return ret; |
| 359 | } |
| 360 | EXPORT_SYMBOL_GPL(__remove_pages); |
| 361 | |
Jeremy Fitzhardinge | 180c06e | 2008-04-28 02:12:03 -0700 | [diff] [blame] | 362 | void online_page(struct page *page) |
| 363 | { |
Jan Beulich | 4738e1b | 2009-09-21 17:03:03 -0700 | [diff] [blame] | 364 | unsigned long pfn = page_to_pfn(page); |
| 365 | |
Jeremy Fitzhardinge | 180c06e | 2008-04-28 02:12:03 -0700 | [diff] [blame] | 366 | totalram_pages++; |
Jan Beulich | 4738e1b | 2009-09-21 17:03:03 -0700 | [diff] [blame] | 367 | if (pfn >= num_physpages) |
| 368 | num_physpages = pfn + 1; |
Jeremy Fitzhardinge | 180c06e | 2008-04-28 02:12:03 -0700 | [diff] [blame] | 369 | |
| 370 | #ifdef CONFIG_HIGHMEM |
| 371 | if (PageHighMem(page)) |
| 372 | totalhigh_pages++; |
| 373 | #endif |
| 374 | |
| 375 | #ifdef CONFIG_FLATMEM |
| 376 | max_mapnr = max(page_to_pfn(page), max_mapnr); |
| 377 | #endif |
| 378 | |
| 379 | ClearPageReserved(page); |
| 380 | init_page_count(page); |
| 381 | __free_page(page); |
| 382 | } |
| 383 | |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 384 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
| 385 | void *arg) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 386 | { |
| 387 | unsigned long i; |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 388 | unsigned long onlined_pages = *(unsigned long *)arg; |
| 389 | struct page *page; |
| 390 | if (PageReserved(pfn_to_page(start_pfn))) |
| 391 | for (i = 0; i < nr_pages; i++) { |
| 392 | page = pfn_to_page(start_pfn + i); |
| 393 | online_page(page); |
| 394 | onlined_pages++; |
| 395 | } |
| 396 | *(unsigned long *)arg = onlined_pages; |
| 397 | return 0; |
| 398 | } |
| 399 | |
| 400 | |
| 401 | int online_pages(unsigned long pfn, unsigned long nr_pages) |
| 402 | { |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 403 | unsigned long onlined_pages = 0; |
| 404 | struct zone *zone; |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 405 | int need_zonelists_rebuild = 0; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 406 | int nid; |
| 407 | int ret; |
| 408 | struct memory_notify arg; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 409 | |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 410 | arg.start_pfn = pfn; |
| 411 | arg.nr_pages = nr_pages; |
| 412 | arg.status_change_nid = -1; |
| 413 | |
| 414 | nid = page_to_nid(pfn_to_page(pfn)); |
| 415 | if (node_present_pages(nid) == 0) |
| 416 | arg.status_change_nid = nid; |
| 417 | |
| 418 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
| 419 | ret = notifier_to_errno(ret); |
| 420 | if (ret) { |
| 421 | memory_notify(MEM_CANCEL_ONLINE, &arg); |
| 422 | return ret; |
| 423 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 424 | /* |
| 425 | * This doesn't need a lock to do pfn_to_page(). |
| 426 | * The section can't be removed here because of the |
Daniel Walker | da19cbc | 2008-02-04 23:35:47 -0800 | [diff] [blame] | 427 | * memory_block->state_mutex. |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 428 | */ |
| 429 | zone = page_zone(pfn_to_page(pfn)); |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 430 | /* |
| 431 | * If this zone is not populated, then it is not in zonelist. |
| 432 | * This means the page allocator ignores this zone. |
| 433 | * So, zonelist must be updated after online. |
| 434 | */ |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 435 | mutex_lock(&zonelists_mutex); |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 436 | if (!populated_zone(zone)) |
| 437 | need_zonelists_rebuild = 1; |
| 438 | |
KAMEZAWA Hiroyuki | 908eedc | 2009-09-22 16:45:46 -0700 | [diff] [blame] | 439 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 440 | online_pages_range); |
Geoff Levand | fd8a422 | 2008-05-14 16:05:50 -0700 | [diff] [blame] | 441 | if (ret) { |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 442 | mutex_unlock(&zonelists_mutex); |
Geoff Levand | fd8a422 | 2008-05-14 16:05:50 -0700 | [diff] [blame] | 443 | printk(KERN_DEBUG "online_pages %lx at %lx failed\n", |
| 444 | nr_pages, pfn); |
| 445 | memory_notify(MEM_CANCEL_ONLINE, &arg); |
| 446 | return ret; |
| 447 | } |
| 448 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 449 | zone->present_pages += onlined_pages; |
Yasunori Goto | f2937be | 2006-03-09 17:33:51 -0800 | [diff] [blame] | 450 | zone->zone_pgdat->node_present_pages += onlined_pages; |
Haicheng Li | 1f52250 | 2010-05-24 14:32:51 -0700 | [diff] [blame] | 451 | if (need_zonelists_rebuild) |
| 452 | build_all_zonelists(zone); |
| 453 | else |
| 454 | zone_pcp_update(zone); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 455 | |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 456 | mutex_unlock(&zonelists_mutex); |
Minchan Kim | bc75d33 | 2009-06-16 15:32:48 -0700 | [diff] [blame] | 457 | setup_per_zone_wmarks(); |
Minchan Kim | bce7394 | 2009-06-16 15:32:50 -0700 | [diff] [blame] | 458 | calculate_zone_inactive_ratio(zone); |
Christoph Lameter | 7ea1530 | 2007-10-16 01:25:29 -0700 | [diff] [blame] | 459 | if (onlined_pages) { |
| 460 | kswapd_run(zone_to_nid(zone)); |
| 461 | node_set_state(zone_to_nid(zone), N_HIGH_MEMORY); |
| 462 | } |
Dave Hansen | 61b1399 | 2005-10-29 18:16:56 -0700 | [diff] [blame] | 463 | |
Haicheng Li | 1f52250 | 2010-05-24 14:32:51 -0700 | [diff] [blame] | 464 | vm_total_pages = nr_free_pagecache_pages(); |
Kent Liu | 2f7f24e | 2008-07-23 21:28:18 -0700 | [diff] [blame] | 465 | |
Chandra Seetharaman | 2d1d43f | 2006-09-29 02:01:25 -0700 | [diff] [blame] | 466 | writeback_set_ratelimit(); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 467 | |
| 468 | if (onlined_pages) |
| 469 | memory_notify(MEM_ONLINE, &arg); |
| 470 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 471 | return 0; |
| 472 | } |
Keith Mannthey | 5394702 | 2006-09-30 23:27:08 -0700 | [diff] [blame] | 473 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 474 | |
Hidetoshi Seto | e131933 | 2009-11-17 14:06:18 -0800 | [diff] [blame] | 475 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
| 476 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 477 | { |
| 478 | struct pglist_data *pgdat; |
| 479 | unsigned long zones_size[MAX_NR_ZONES] = {0}; |
| 480 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; |
| 481 | unsigned long start_pfn = start >> PAGE_SHIFT; |
| 482 | |
| 483 | pgdat = arch_alloc_nodedata(nid); |
| 484 | if (!pgdat) |
| 485 | return NULL; |
| 486 | |
| 487 | arch_refresh_nodedata(nid, pgdat); |
| 488 | |
| 489 | /* we can use NODE_DATA(nid) from here */ |
| 490 | |
| 491 | /* init node's zones as empty zones, we don't have any present pages.*/ |
Johannes Weiner | 9109fb7 | 2008-07-23 21:27:20 -0700 | [diff] [blame] | 492 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 493 | |
| 494 | return pgdat; |
| 495 | } |
| 496 | |
| 497 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) |
| 498 | { |
| 499 | arch_refresh_nodedata(nid, NULL); |
| 500 | arch_free_nodedata(pgdat); |
| 501 | return; |
| 502 | } |
| 503 | |
KAMEZAWA Hiroyuki | 0a54703 | 2006-06-27 02:53:35 -0700 | [diff] [blame] | 504 | |
minskey guo | cf23422 | 2010-05-24 14:32:41 -0700 | [diff] [blame] | 505 | /* |
| 506 | * called by cpu_up() to online a node without onlined memory. |
| 507 | */ |
| 508 | int mem_online_node(int nid) |
| 509 | { |
| 510 | pg_data_t *pgdat; |
| 511 | int ret; |
| 512 | |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 513 | lock_memory_hotplug(); |
minskey guo | cf23422 | 2010-05-24 14:32:41 -0700 | [diff] [blame] | 514 | pgdat = hotadd_new_pgdat(nid, 0); |
| 515 | if (pgdat) { |
| 516 | ret = -ENOMEM; |
| 517 | goto out; |
| 518 | } |
| 519 | node_set_online(nid); |
| 520 | ret = register_one_node(nid); |
| 521 | BUG_ON(ret); |
| 522 | |
| 523 | out: |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 524 | unlock_memory_hotplug(); |
minskey guo | cf23422 | 2010-05-24 14:32:41 -0700 | [diff] [blame] | 525 | return ret; |
| 526 | } |
| 527 | |
Al Viro | 3116848 | 2008-11-22 17:33:24 +0000 | [diff] [blame] | 528 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
| 529 | int __ref add_memory(int nid, u64 start, u64 size) |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 530 | { |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 531 | pg_data_t *pgdat = NULL; |
| 532 | int new_pgdat = 0; |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 533 | struct resource *res; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 534 | int ret; |
| 535 | |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 536 | lock_memory_hotplug(); |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 537 | |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 538 | res = register_memory_resource(start, size); |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 539 | ret = -EEXIST; |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 540 | if (!res) |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 541 | goto out; |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 542 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 543 | if (!node_online(nid)) { |
| 544 | pgdat = hotadd_new_pgdat(nid, start); |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 545 | ret = -ENOMEM; |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 546 | if (!pgdat) |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 547 | goto out; |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 548 | new_pgdat = 1; |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 549 | } |
| 550 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 551 | /* call arch's memory hotadd */ |
| 552 | ret = arch_add_memory(nid, start, size); |
| 553 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 554 | if (ret < 0) |
| 555 | goto error; |
| 556 | |
Yasunori Goto | 0fc4415 | 2006-06-27 02:53:38 -0700 | [diff] [blame] | 557 | /* we online node here. we can't roll back from here. */ |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 558 | node_set_online(nid); |
| 559 | |
Yasunori Goto | 0fc4415 | 2006-06-27 02:53:38 -0700 | [diff] [blame] | 560 | if (new_pgdat) { |
| 561 | ret = register_one_node(nid); |
| 562 | /* |
| 563 | * If sysfs file of new node can't create, cpu on the node |
| 564 | * can't be hot-added. There is no rollback way now. |
| 565 | * So, check by BUG_ON() to catch it reluctantly.. |
| 566 | */ |
| 567 | BUG_ON(ret); |
| 568 | } |
| 569 | |
akpm@linux-foundation.org | d96ae53 | 2010-03-05 13:41:58 -0800 | [diff] [blame] | 570 | /* create new memmap entry */ |
| 571 | firmware_map_add_hotplug(start, start + size, "System RAM"); |
| 572 | |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 573 | goto out; |
| 574 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 575 | error: |
| 576 | /* rollback pgdat allocation and others */ |
| 577 | if (new_pgdat) |
| 578 | rollback_node_hotadd(nid, pgdat); |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 579 | if (res) |
| 580 | release_memory_resource(res); |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 581 | |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 582 | out: |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 583 | unlock_memory_hotplug(); |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 584 | return ret; |
| 585 | } |
| 586 | EXPORT_SYMBOL_GPL(add_memory); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 587 | |
| 588 | #ifdef CONFIG_MEMORY_HOTREMOVE |
| 589 | /* |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 590 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy |
| 591 | * set and the size of the free page is given by page_order(). Using this, |
| 592 | * the function determines if the pageblock contains only free pages. |
| 593 | * Due to buddy contraints, a free page at least the size of a pageblock will |
| 594 | * be located at the start of the pageblock |
| 595 | */ |
| 596 | static inline int pageblock_free(struct page *page) |
| 597 | { |
| 598 | return PageBuddy(page) && page_order(page) >= pageblock_order; |
| 599 | } |
| 600 | |
| 601 | /* Return the start of the next active pageblock after a given page */ |
| 602 | static struct page *next_active_pageblock(struct page *page) |
| 603 | { |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 604 | /* Ensure the starting page is pageblock-aligned */ |
| 605 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); |
| 606 | |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 607 | /* If the entire pageblock is free, move to the end of free page */ |
KAMEZAWA Hiroyuki | 0dcc48c | 2010-09-09 16:38:01 -0700 | [diff] [blame] | 608 | if (pageblock_free(page)) { |
| 609 | int order; |
| 610 | /* be careful. we don't have locks, page_order can be changed.*/ |
| 611 | order = page_order(page); |
| 612 | if ((order < MAX_ORDER) && (order >= pageblock_order)) |
| 613 | return page + (1 << order); |
| 614 | } |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 615 | |
KAMEZAWA Hiroyuki | 0dcc48c | 2010-09-09 16:38:01 -0700 | [diff] [blame] | 616 | return page + pageblock_nr_pages; |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 617 | } |
| 618 | |
| 619 | /* Checks if this range of memory is likely to be hot-removable. */ |
| 620 | int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) |
| 621 | { |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 622 | struct page *page = pfn_to_page(start_pfn); |
| 623 | struct page *end_page = page + nr_pages; |
| 624 | |
| 625 | /* Check the starting page of each pageblock within the range */ |
| 626 | for (; page < end_page; page = next_active_pageblock(page)) { |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 627 | if (!is_pageblock_removable_nolock(page)) |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 628 | return 0; |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 629 | cond_resched(); |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | /* All pageblocks in the memory block are likely to be hot-removable */ |
| 633 | return 1; |
| 634 | } |
| 635 | |
| 636 | /* |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 637 | * Confirm all pages in a range [start, end) is belongs to the same zone. |
| 638 | */ |
| 639 | static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn) |
| 640 | { |
| 641 | unsigned long pfn; |
| 642 | struct zone *zone = NULL; |
| 643 | struct page *page; |
| 644 | int i; |
| 645 | for (pfn = start_pfn; |
| 646 | pfn < end_pfn; |
| 647 | pfn += MAX_ORDER_NR_PAGES) { |
| 648 | i = 0; |
| 649 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ |
| 650 | while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i)) |
| 651 | i++; |
| 652 | if (i == MAX_ORDER_NR_PAGES) |
| 653 | continue; |
| 654 | page = pfn_to_page(pfn + i); |
| 655 | if (zone && page_zone(page) != zone) |
| 656 | return 0; |
| 657 | zone = page_zone(page); |
| 658 | } |
| 659 | return 1; |
| 660 | } |
| 661 | |
| 662 | /* |
| 663 | * Scanning pfn is much easier than scanning lru list. |
| 664 | * Scan pfn from start to end and Find LRU page. |
| 665 | */ |
Andrew Morton | 7bbc090 | 2010-10-26 14:22:05 -0700 | [diff] [blame] | 666 | static unsigned long scan_lru_pages(unsigned long start, unsigned long end) |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 667 | { |
| 668 | unsigned long pfn; |
| 669 | struct page *page; |
| 670 | for (pfn = start; pfn < end; pfn++) { |
| 671 | if (pfn_valid(pfn)) { |
| 672 | page = pfn_to_page(pfn); |
| 673 | if (PageLRU(page)) |
| 674 | return pfn; |
| 675 | } |
| 676 | } |
| 677 | return 0; |
| 678 | } |
| 679 | |
| 680 | static struct page * |
Hugh Dickins | 3c1d437 | 2009-01-06 14:39:23 -0800 | [diff] [blame] | 681 | hotremove_migrate_alloc(struct page *page, unsigned long private, int **x) |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 682 | { |
Hugh Dickins | 3c1d437 | 2009-01-06 14:39:23 -0800 | [diff] [blame] | 683 | /* This should be improooooved!! */ |
| 684 | return alloc_page(GFP_HIGHUSER_MOVABLE); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 685 | } |
| 686 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 687 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
| 688 | static int |
| 689 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) |
| 690 | { |
| 691 | unsigned long pfn; |
| 692 | struct page *page; |
| 693 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; |
| 694 | int not_managed = 0; |
| 695 | int ret = 0; |
| 696 | LIST_HEAD(source); |
| 697 | |
| 698 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { |
| 699 | if (!pfn_valid(pfn)) |
| 700 | continue; |
| 701 | page = pfn_to_page(pfn); |
| 702 | if (!page_count(page)) |
| 703 | continue; |
| 704 | /* |
| 705 | * We can skip free pages. And we can only deal with pages on |
| 706 | * LRU. |
| 707 | */ |
Nick Piggin | 62695a8 | 2008-10-18 20:26:09 -0700 | [diff] [blame] | 708 | ret = isolate_lru_page(page); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 709 | if (!ret) { /* Success */ |
Nick Piggin | 62695a8 | 2008-10-18 20:26:09 -0700 | [diff] [blame] | 710 | list_add_tail(&page->lru, &source); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 711 | move_pages--; |
KOSAKI Motohiro | 6d9c285 | 2009-12-14 17:58:11 -0800 | [diff] [blame] | 712 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
| 713 | page_is_file_cache(page)); |
| 714 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 715 | } else { |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 716 | #ifdef CONFIG_DEBUG_VM |
Wu Fengguang | 718a382 | 2010-03-10 15:20:43 -0800 | [diff] [blame] | 717 | printk(KERN_ALERT "removing pfn %lx from LRU failed\n", |
| 718 | pfn); |
| 719 | dump_page(page); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 720 | #endif |
Bob Liu | 809c444 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 721 | /* Becasue we don't have big zone->lock. we should |
| 722 | check this again here. */ |
| 723 | if (page_count(page)) { |
| 724 | not_managed++; |
Bob Liu | f3ab263 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 725 | ret = -EBUSY; |
Bob Liu | 809c444 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 726 | break; |
| 727 | } |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 728 | } |
| 729 | } |
Bob Liu | f3ab263 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 730 | if (!list_empty(&source)) { |
| 731 | if (not_managed) { |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 732 | putback_lru_pages(&source); |
Bob Liu | f3ab263 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 733 | goto out; |
| 734 | } |
| 735 | /* this function returns # of failed pages */ |
| 736 | ret = migrate_pages(&source, hotremove_migrate_alloc, 0, 1); |
| 737 | if (ret) |
| 738 | putback_lru_pages(&source); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 739 | } |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 740 | out: |
| 741 | return ret; |
| 742 | } |
| 743 | |
| 744 | /* |
| 745 | * remove from free_area[] and mark all as Reserved. |
| 746 | */ |
| 747 | static int |
| 748 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, |
| 749 | void *data) |
| 750 | { |
| 751 | __offline_isolated_pages(start, start + nr_pages); |
| 752 | return 0; |
| 753 | } |
| 754 | |
| 755 | static void |
| 756 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) |
| 757 | { |
KAMEZAWA Hiroyuki | 908eedc | 2009-09-22 16:45:46 -0700 | [diff] [blame] | 758 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 759 | offline_isolated_pages_cb); |
| 760 | } |
| 761 | |
| 762 | /* |
| 763 | * Check all pages in range, recoreded as memory resource, are isolated. |
| 764 | */ |
| 765 | static int |
| 766 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, |
| 767 | void *data) |
| 768 | { |
| 769 | int ret; |
| 770 | long offlined = *(long *)data; |
| 771 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages); |
| 772 | offlined = nr_pages; |
| 773 | if (!ret) |
| 774 | *(long *)data += offlined; |
| 775 | return ret; |
| 776 | } |
| 777 | |
| 778 | static long |
| 779 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) |
| 780 | { |
| 781 | long offlined = 0; |
| 782 | int ret; |
| 783 | |
KAMEZAWA Hiroyuki | 908eedc | 2009-09-22 16:45:46 -0700 | [diff] [blame] | 784 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 785 | check_pages_isolated_cb); |
| 786 | if (ret < 0) |
| 787 | offlined = (long)ret; |
| 788 | return offlined; |
| 789 | } |
| 790 | |
Andrew Morton | b4e655a | 2009-12-14 17:59:35 -0800 | [diff] [blame] | 791 | static int offline_pages(unsigned long start_pfn, |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 792 | unsigned long end_pfn, unsigned long timeout) |
| 793 | { |
| 794 | unsigned long pfn, nr_pages, expire; |
| 795 | long offlined_pages; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 796 | int ret, drain, retry_max, node; |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 797 | struct zone *zone; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 798 | struct memory_notify arg; |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 799 | |
| 800 | BUG_ON(start_pfn >= end_pfn); |
| 801 | /* at least, alignment against pageblock is necessary */ |
| 802 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) |
| 803 | return -EINVAL; |
| 804 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) |
| 805 | return -EINVAL; |
| 806 | /* This makes hotplug much easier...and readable. |
| 807 | we assume this for now. .*/ |
| 808 | if (!test_pages_in_a_zone(start_pfn, end_pfn)) |
| 809 | return -EINVAL; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 810 | |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 811 | lock_memory_hotplug(); |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 812 | |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 813 | zone = page_zone(pfn_to_page(start_pfn)); |
| 814 | node = zone_to_nid(zone); |
| 815 | nr_pages = end_pfn - start_pfn; |
| 816 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 817 | /* set above range as isolated */ |
| 818 | ret = start_isolate_page_range(start_pfn, end_pfn); |
| 819 | if (ret) |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 820 | goto out; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 821 | |
| 822 | arg.start_pfn = start_pfn; |
| 823 | arg.nr_pages = nr_pages; |
| 824 | arg.status_change_nid = -1; |
| 825 | if (nr_pages >= node_present_pages(node)) |
| 826 | arg.status_change_nid = node; |
| 827 | |
| 828 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); |
| 829 | ret = notifier_to_errno(ret); |
| 830 | if (ret) |
| 831 | goto failed_removal; |
| 832 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 833 | pfn = start_pfn; |
| 834 | expire = jiffies + timeout; |
| 835 | drain = 0; |
| 836 | retry_max = 5; |
| 837 | repeat: |
| 838 | /* start memory hot removal */ |
| 839 | ret = -EAGAIN; |
| 840 | if (time_after(jiffies, expire)) |
| 841 | goto failed_removal; |
| 842 | ret = -EINTR; |
| 843 | if (signal_pending(current)) |
| 844 | goto failed_removal; |
| 845 | ret = 0; |
| 846 | if (drain) { |
| 847 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 848 | cond_resched(); |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 849 | drain_all_pages(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 850 | } |
| 851 | |
| 852 | pfn = scan_lru_pages(start_pfn, end_pfn); |
| 853 | if (pfn) { /* We have page on LRU */ |
| 854 | ret = do_migrate_range(pfn, end_pfn); |
| 855 | if (!ret) { |
| 856 | drain = 1; |
| 857 | goto repeat; |
| 858 | } else { |
| 859 | if (ret < 0) |
| 860 | if (--retry_max == 0) |
| 861 | goto failed_removal; |
| 862 | yield(); |
| 863 | drain = 1; |
| 864 | goto repeat; |
| 865 | } |
| 866 | } |
| 867 | /* drain all zone's lru pagevec, this is asyncronous... */ |
| 868 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 869 | yield(); |
| 870 | /* drain pcp pages , this is synchrouns. */ |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 871 | drain_all_pages(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 872 | /* check again */ |
| 873 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); |
| 874 | if (offlined_pages < 0) { |
| 875 | ret = -EBUSY; |
| 876 | goto failed_removal; |
| 877 | } |
| 878 | printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages); |
| 879 | /* Ok, all of our target is islaoted. |
| 880 | We cannot do rollback at this point. */ |
| 881 | offline_isolated_pages(start_pfn, end_pfn); |
KAMEZAWA Hiroyuki | dbc0e4c | 2007-11-14 16:59:12 -0800 | [diff] [blame] | 882 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
| 883 | undo_isolate_page_range(start_pfn, end_pfn); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 884 | /* removal success */ |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 885 | zone->present_pages -= offlined_pages; |
| 886 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
| 887 | totalram_pages -= offlined_pages; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 888 | |
Minchan Kim | bce7394 | 2009-06-16 15:32:50 -0700 | [diff] [blame] | 889 | setup_per_zone_wmarks(); |
| 890 | calculate_zone_inactive_ratio(zone); |
David Rientjes | 8fe23e0 | 2009-12-14 17:58:33 -0800 | [diff] [blame] | 891 | if (!node_present_pages(node)) { |
| 892 | node_clear_state(node, N_HIGH_MEMORY); |
| 893 | kswapd_stop(node); |
| 894 | } |
Minchan Kim | bce7394 | 2009-06-16 15:32:50 -0700 | [diff] [blame] | 895 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 896 | vm_total_pages = nr_free_pagecache_pages(); |
| 897 | writeback_set_ratelimit(); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 898 | |
| 899 | memory_notify(MEM_OFFLINE, &arg); |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 900 | unlock_memory_hotplug(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 901 | return 0; |
| 902 | |
| 903 | failed_removal: |
| 904 | printk(KERN_INFO "memory offlining %lx to %lx failed\n", |
| 905 | start_pfn, end_pfn); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 906 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 907 | /* pushback to free area */ |
| 908 | undo_isolate_page_range(start_pfn, end_pfn); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 909 | |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 910 | out: |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 911 | unlock_memory_hotplug(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 912 | return ret; |
| 913 | } |
Badari Pulavarty | 7108878 | 2008-10-18 20:25:58 -0700 | [diff] [blame] | 914 | |
| 915 | int remove_memory(u64 start, u64 size) |
| 916 | { |
| 917 | unsigned long start_pfn, end_pfn; |
| 918 | |
| 919 | start_pfn = PFN_DOWN(start); |
| 920 | end_pfn = start_pfn + PFN_DOWN(size); |
| 921 | return offline_pages(start_pfn, end_pfn, 120 * HZ); |
| 922 | } |
KAMEZAWA Hiroyuki | 48e9419 | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 923 | #else |
| 924 | int remove_memory(u64 start, u64 size) |
| 925 | { |
| 926 | return -EINVAL; |
| 927 | } |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 928 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
Badari Pulavarty | 7108878 | 2008-10-18 20:25:58 -0700 | [diff] [blame] | 929 | EXPORT_SYMBOL_GPL(remove_memory); |