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1#include <linux/mm.h>
2#include <linux/mmzone.h>
3#include <linux/bootmem.h>
4#include <linux/bit_spinlock.h>
5#include <linux/page_cgroup.h>
6#include <linux/hash.h>
94b6da5a 7#include <linux/slab.h>
52d4b9ac 8#include <linux/memory.h>
4c821042 9#include <linux/vmalloc.h>
94b6da5a 10#include <linux/cgroup.h>
27a7faa0 11#include <linux/swapops.h>
7952f988 12#include <linux/kmemleak.h>
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13
14static void __meminit
15__init_page_cgroup(struct page_cgroup *pc, unsigned long pfn)
16{
17 pc->flags = 0;
18 pc->mem_cgroup = NULL;
19 pc->page = pfn_to_page(pfn);
08e552c6 20 INIT_LIST_HEAD(&pc->lru);
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21}
22static unsigned long total_usage;
23
24#if !defined(CONFIG_SPARSEMEM)
25
26
31168481 27void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
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28{
29 pgdat->node_page_cgroup = NULL;
30}
31
32struct page_cgroup *lookup_page_cgroup(struct page *page)
33{
34 unsigned long pfn = page_to_pfn(page);
35 unsigned long offset;
36 struct page_cgroup *base;
37
38 base = NODE_DATA(page_to_nid(page))->node_page_cgroup;
39 if (unlikely(!base))
40 return NULL;
41
42 offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn;
43 return base + offset;
44}
45
46static int __init alloc_node_page_cgroup(int nid)
47{
48 struct page_cgroup *base, *pc;
49 unsigned long table_size;
50 unsigned long start_pfn, nr_pages, index;
51
52 start_pfn = NODE_DATA(nid)->node_start_pfn;
53 nr_pages = NODE_DATA(nid)->node_spanned_pages;
54
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55 if (!nr_pages)
56 return 0;
57
52d4b9ac 58 table_size = sizeof(struct page_cgroup) * nr_pages;
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59
60 base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
61 table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
62 if (!base)
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63 return -ENOMEM;
64 for (index = 0; index < nr_pages; index++) {
65 pc = base + index;
66 __init_page_cgroup(pc, start_pfn + index);
67 }
68 NODE_DATA(nid)->node_page_cgroup = base;
69 total_usage += table_size;
70 return 0;
71}
72
ca371c0d 73void __init page_cgroup_init_flatmem(void)
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74{
75
76 int nid, fail;
77
f8d66542 78 if (mem_cgroup_disabled())
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79 return;
80
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81 for_each_online_node(nid) {
82 fail = alloc_node_page_cgroup(nid);
83 if (fail)
84 goto fail;
85 }
86 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
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87 printk(KERN_INFO "please try 'cgroup_disable=memory' option if you"
88 " don't want memory cgroups\n");
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89 return;
90fail:
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91 printk(KERN_CRIT "allocation of page_cgroup failed.\n");
92 printk(KERN_CRIT "please try 'cgroup_disable=memory' boot option\n");
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93 panic("Out of memory");
94}
95
96#else /* CONFIG_FLAT_NODE_MEM_MAP */
97
98struct page_cgroup *lookup_page_cgroup(struct page *page)
99{
100 unsigned long pfn = page_to_pfn(page);
101 struct mem_section *section = __pfn_to_section(pfn);
102
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103 if (!section->page_cgroup)
104 return NULL;
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105 return section->page_cgroup + pfn;
106}
107
31168481 108/* __alloc_bootmem...() is protected by !slab_available() */
feb16694 109static int __init_refok init_section_page_cgroup(unsigned long pfn)
52d4b9ac 110{
0753b0ef 111 struct mem_section *section = __pfn_to_section(pfn);
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112 struct page_cgroup *base, *pc;
113 unsigned long table_size;
114 int nid, index;
115
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116 if (!section->page_cgroup) {
117 nid = page_to_nid(pfn_to_page(pfn));
118 table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
ca371c0d 119 VM_BUG_ON(!slab_is_available());
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120 if (node_state(nid, N_HIGH_MEMORY)) {
121 base = kmalloc_node(table_size,
ca371c0d 122 GFP_KERNEL | __GFP_NOWARN, nid);
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123 if (!base)
124 base = vmalloc_node(table_size, nid);
125 } else {
126 base = kmalloc(table_size, GFP_KERNEL | __GFP_NOWARN);
127 if (!base)
128 base = vmalloc(table_size);
129 }
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130 /*
131 * The value stored in section->page_cgroup is (base - pfn)
132 * and it does not point to the memory block allocated above,
133 * causing kmemleak false positives.
134 */
135 kmemleak_not_leak(base);
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136 } else {
137 /*
138 * We don't have to allocate page_cgroup again, but
139 * address of memmap may be changed. So, we have to initialize
140 * again.
141 */
142 base = section->page_cgroup + pfn;
143 table_size = 0;
144 /* check address of memmap is changed or not. */
145 if (base->page == pfn_to_page(pfn))
146 return 0;
94b6da5a 147 }
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148
149 if (!base) {
150 printk(KERN_ERR "page cgroup allocation failure\n");
151 return -ENOMEM;
152 }
153
154 for (index = 0; index < PAGES_PER_SECTION; index++) {
155 pc = base + index;
156 __init_page_cgroup(pc, pfn + index);
157 }
158
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159 section->page_cgroup = base - pfn;
160 total_usage += table_size;
161 return 0;
162}
163#ifdef CONFIG_MEMORY_HOTPLUG
164void __free_page_cgroup(unsigned long pfn)
165{
166 struct mem_section *ms;
167 struct page_cgroup *base;
168
169 ms = __pfn_to_section(pfn);
170 if (!ms || !ms->page_cgroup)
171 return;
172 base = ms->page_cgroup + pfn;
94b6da5a 173 if (is_vmalloc_addr(base)) {
52d4b9ac 174 vfree(base);
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175 ms->page_cgroup = NULL;
176 } else {
177 struct page *page = virt_to_page(base);
178 if (!PageReserved(page)) { /* Is bootmem ? */
179 kfree(base);
180 ms->page_cgroup = NULL;
181 }
182 }
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183}
184
31168481 185int __meminit online_page_cgroup(unsigned long start_pfn,
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186 unsigned long nr_pages,
187 int nid)
188{
189 unsigned long start, end, pfn;
190 int fail = 0;
191
33c5d3d6 192 start = start_pfn & ~(PAGES_PER_SECTION - 1);
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193 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
194
195 for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
196 if (!pfn_present(pfn))
197 continue;
198 fail = init_section_page_cgroup(pfn);
199 }
200 if (!fail)
201 return 0;
202
203 /* rollback */
204 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
205 __free_page_cgroup(pfn);
206
207 return -ENOMEM;
208}
209
31168481 210int __meminit offline_page_cgroup(unsigned long start_pfn,
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211 unsigned long nr_pages, int nid)
212{
213 unsigned long start, end, pfn;
214
33c5d3d6 215 start = start_pfn & ~(PAGES_PER_SECTION - 1);
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216 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
217
218 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
219 __free_page_cgroup(pfn);
220 return 0;
221
222}
223
31168481 224static int __meminit page_cgroup_callback(struct notifier_block *self,
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225 unsigned long action, void *arg)
226{
227 struct memory_notify *mn = arg;
228 int ret = 0;
229 switch (action) {
230 case MEM_GOING_ONLINE:
231 ret = online_page_cgroup(mn->start_pfn,
232 mn->nr_pages, mn->status_change_nid);
233 break;
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234 case MEM_OFFLINE:
235 offline_page_cgroup(mn->start_pfn,
236 mn->nr_pages, mn->status_change_nid);
237 break;
dc19f9db 238 case MEM_CANCEL_ONLINE:
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239 case MEM_GOING_OFFLINE:
240 break;
241 case MEM_ONLINE:
242 case MEM_CANCEL_OFFLINE:
243 break;
244 }
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245
246 if (ret)
247 ret = notifier_from_errno(ret);
248 else
249 ret = NOTIFY_OK;
250
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251 return ret;
252}
253
254#endif
255
256void __init page_cgroup_init(void)
257{
258 unsigned long pfn;
259 int fail = 0;
260
f8d66542 261 if (mem_cgroup_disabled())
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262 return;
263
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264 for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
265 if (!pfn_present(pfn))
266 continue;
267 fail = init_section_page_cgroup(pfn);
268 }
269 if (fail) {
8ca739e3 270 printk(KERN_CRIT "try 'cgroup_disable=memory' boot option\n");
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271 panic("Out of memory");
272 } else {
273 hotplug_memory_notifier(page_cgroup_callback, 0);
274 }
275 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
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276 printk(KERN_INFO "please try 'cgroup_disable=memory' option if you don't"
277 " want memory cgroups\n");
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278}
279
31168481 280void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
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281{
282 return;
283}
284
285#endif
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286
287
288#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
289
290static DEFINE_MUTEX(swap_cgroup_mutex);
291struct swap_cgroup_ctrl {
292 struct page **map;
293 unsigned long length;
e9e58a4e 294 spinlock_t lock;
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295};
296
297struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES];
298
27a7faa0 299struct swap_cgroup {
a3b2d692 300 unsigned short id;
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301};
302#define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup))
303#define SC_POS_MASK (SC_PER_PAGE - 1)
304
305/*
306 * SwapCgroup implements "lookup" and "exchange" operations.
307 * In typical usage, this swap_cgroup is accessed via memcg's charge/uncharge
308 * against SwapCache. At swap_free(), this is accessed directly from swap.
309 *
310 * This means,
311 * - we have no race in "exchange" when we're accessed via SwapCache because
312 * SwapCache(and its swp_entry) is under lock.
313 * - When called via swap_free(), there is no user of this entry and no race.
314 * Then, we don't need lock around "exchange".
315 *
316 * TODO: we can push these buffers out to HIGHMEM.
317 */
318
319/*
320 * allocate buffer for swap_cgroup.
321 */
322static int swap_cgroup_prepare(int type)
323{
324 struct page *page;
325 struct swap_cgroup_ctrl *ctrl;
326 unsigned long idx, max;
327
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328 ctrl = &swap_cgroup_ctrl[type];
329
330 for (idx = 0; idx < ctrl->length; idx++) {
331 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
332 if (!page)
333 goto not_enough_page;
334 ctrl->map[idx] = page;
335 }
336 return 0;
337not_enough_page:
338 max = idx;
339 for (idx = 0; idx < max; idx++)
340 __free_page(ctrl->map[idx]);
341
342 return -ENOMEM;
343}
344
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345/**
346 * swap_cgroup_cmpxchg - cmpxchg mem_cgroup's id for this swp_entry.
347 * @end: swap entry to be cmpxchged
348 * @old: old id
349 * @new: new id
350 *
351 * Returns old id at success, 0 at failure.
352 * (There is no mem_cgroup useing 0 as its id)
353 */
354unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
355 unsigned short old, unsigned short new)
356{
357 int type = swp_type(ent);
358 unsigned long offset = swp_offset(ent);
359 unsigned long idx = offset / SC_PER_PAGE;
360 unsigned long pos = offset & SC_POS_MASK;
361 struct swap_cgroup_ctrl *ctrl;
362 struct page *mappage;
363 struct swap_cgroup *sc;
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364 unsigned long flags;
365 unsigned short retval;
02491447
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366
367 ctrl = &swap_cgroup_ctrl[type];
368
369 mappage = ctrl->map[idx];
370 sc = page_address(mappage);
371 sc += pos;
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372 spin_lock_irqsave(&ctrl->lock, flags);
373 retval = sc->id;
374 if (retval == old)
375 sc->id = new;
02491447 376 else
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377 retval = 0;
378 spin_unlock_irqrestore(&ctrl->lock, flags);
379 return retval;
02491447
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380}
381
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382/**
383 * swap_cgroup_record - record mem_cgroup for this swp_entry.
384 * @ent: swap entry to be recorded into
385 * @mem: mem_cgroup to be recorded
386 *
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387 * Returns old value at success, 0 at failure.
388 * (Of course, old value can be 0.)
27a7faa0 389 */
a3b2d692 390unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
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391{
392 int type = swp_type(ent);
393 unsigned long offset = swp_offset(ent);
394 unsigned long idx = offset / SC_PER_PAGE;
395 unsigned long pos = offset & SC_POS_MASK;
396 struct swap_cgroup_ctrl *ctrl;
397 struct page *mappage;
398 struct swap_cgroup *sc;
a3b2d692 399 unsigned short old;
e9e58a4e 400 unsigned long flags;
27a7faa0 401
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402 ctrl = &swap_cgroup_ctrl[type];
403
404 mappage = ctrl->map[idx];
405 sc = page_address(mappage);
406 sc += pos;
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407 spin_lock_irqsave(&ctrl->lock, flags);
408 old = sc->id;
409 sc->id = id;
410 spin_unlock_irqrestore(&ctrl->lock, flags);
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411
412 return old;
413}
414
415/**
416 * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry
417 * @ent: swap entry to be looked up.
418 *
a3b2d692 419 * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
27a7faa0 420 */
a3b2d692 421unsigned short lookup_swap_cgroup(swp_entry_t ent)
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422{
423 int type = swp_type(ent);
424 unsigned long offset = swp_offset(ent);
425 unsigned long idx = offset / SC_PER_PAGE;
426 unsigned long pos = offset & SC_POS_MASK;
427 struct swap_cgroup_ctrl *ctrl;
428 struct page *mappage;
429 struct swap_cgroup *sc;
a3b2d692 430 unsigned short ret;
27a7faa0 431
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432 ctrl = &swap_cgroup_ctrl[type];
433 mappage = ctrl->map[idx];
434 sc = page_address(mappage);
435 sc += pos;
a3b2d692 436 ret = sc->id;
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437 return ret;
438}
439
440int swap_cgroup_swapon(int type, unsigned long max_pages)
441{
442 void *array;
443 unsigned long array_size;
444 unsigned long length;
445 struct swap_cgroup_ctrl *ctrl;
446
447 if (!do_swap_account)
448 return 0;
449
450 length = ((max_pages/SC_PER_PAGE) + 1);
451 array_size = length * sizeof(void *);
452
453 array = vmalloc(array_size);
454 if (!array)
455 goto nomem;
456
457 memset(array, 0, array_size);
458 ctrl = &swap_cgroup_ctrl[type];
459 mutex_lock(&swap_cgroup_mutex);
460 ctrl->length = length;
461 ctrl->map = array;
e9e58a4e 462 spin_lock_init(&ctrl->lock);
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463 if (swap_cgroup_prepare(type)) {
464 /* memory shortage */
465 ctrl->map = NULL;
466 ctrl->length = 0;
467 vfree(array);
468 mutex_unlock(&swap_cgroup_mutex);
469 goto nomem;
470 }
471 mutex_unlock(&swap_cgroup_mutex);
472
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473 return 0;
474nomem:
475 printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n");
476 printk(KERN_INFO
477 "swap_cgroup can be disabled by noswapaccount boot option\n");
478 return -ENOMEM;
479}
480
481void swap_cgroup_swapoff(int type)
482{
483 int i;
484 struct swap_cgroup_ctrl *ctrl;
485
486 if (!do_swap_account)
487 return;
488
489 mutex_lock(&swap_cgroup_mutex);
490 ctrl = &swap_cgroup_ctrl[type];
491 if (ctrl->map) {
492 for (i = 0; i < ctrl->length; i++) {
493 struct page *page = ctrl->map[i];
494 if (page)
495 __free_page(page);
496 }
497 vfree(ctrl->map);
498 ctrl->map = NULL;
499 ctrl->length = 0;
500 }
501 mutex_unlock(&swap_cgroup_mutex);
502}
503
504#endif