Commit | Line | Data |
---|---|---|
52d4b9ac KH |
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> |
52d4b9ac | 13 | |
6b3ae58e | 14 | static void __meminit init_page_cgroup(struct page_cgroup *pc, unsigned long id) |
52d4b9ac KH |
15 | { |
16 | pc->flags = 0; | |
6b3ae58e | 17 | set_page_cgroup_array_id(pc, id); |
52d4b9ac | 18 | pc->mem_cgroup = NULL; |
08e552c6 | 19 | INIT_LIST_HEAD(&pc->lru); |
52d4b9ac KH |
20 | } |
21 | static unsigned long total_usage; | |
22 | ||
23 | #if !defined(CONFIG_SPARSEMEM) | |
24 | ||
25 | ||
31168481 | 26 | void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
52d4b9ac KH |
27 | { |
28 | pgdat->node_page_cgroup = NULL; | |
29 | } | |
30 | ||
31 | struct page_cgroup *lookup_page_cgroup(struct page *page) | |
32 | { | |
33 | unsigned long pfn = page_to_pfn(page); | |
34 | unsigned long offset; | |
35 | struct page_cgroup *base; | |
36 | ||
37 | base = NODE_DATA(page_to_nid(page))->node_page_cgroup; | |
38 | if (unlikely(!base)) | |
39 | return NULL; | |
40 | ||
41 | offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn; | |
42 | return base + offset; | |
43 | } | |
44 | ||
6b3ae58e JW |
45 | struct page *lookup_cgroup_page(struct page_cgroup *pc) |
46 | { | |
47 | unsigned long pfn; | |
48 | struct page *page; | |
49 | pg_data_t *pgdat; | |
50 | ||
51 | pgdat = NODE_DATA(page_cgroup_array_id(pc)); | |
52 | pfn = pc - pgdat->node_page_cgroup + pgdat->node_start_pfn; | |
53 | page = pfn_to_page(pfn); | |
54 | VM_BUG_ON(pc != lookup_page_cgroup(page)); | |
55 | return page; | |
56 | } | |
57 | ||
52d4b9ac KH |
58 | static int __init alloc_node_page_cgroup(int nid) |
59 | { | |
60 | struct page_cgroup *base, *pc; | |
61 | unsigned long table_size; | |
62 | unsigned long start_pfn, nr_pages, index; | |
63 | ||
64 | start_pfn = NODE_DATA(nid)->node_start_pfn; | |
65 | nr_pages = NODE_DATA(nid)->node_spanned_pages; | |
66 | ||
653d22c0 KH |
67 | if (!nr_pages) |
68 | return 0; | |
69 | ||
52d4b9ac | 70 | table_size = sizeof(struct page_cgroup) * nr_pages; |
ca371c0d KH |
71 | |
72 | base = __alloc_bootmem_node_nopanic(NODE_DATA(nid), | |
73 | table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); | |
74 | if (!base) | |
52d4b9ac KH |
75 | return -ENOMEM; |
76 | for (index = 0; index < nr_pages; index++) { | |
77 | pc = base + index; | |
6b3ae58e | 78 | init_page_cgroup(pc, nid); |
52d4b9ac KH |
79 | } |
80 | NODE_DATA(nid)->node_page_cgroup = base; | |
81 | total_usage += table_size; | |
82 | return 0; | |
83 | } | |
84 | ||
ca371c0d | 85 | void __init page_cgroup_init_flatmem(void) |
52d4b9ac KH |
86 | { |
87 | ||
88 | int nid, fail; | |
89 | ||
f8d66542 | 90 | if (mem_cgroup_disabled()) |
94b6da5a KH |
91 | return; |
92 | ||
52d4b9ac KH |
93 | for_each_online_node(nid) { |
94 | fail = alloc_node_page_cgroup(nid); | |
95 | if (fail) | |
96 | goto fail; | |
97 | } | |
98 | printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage); | |
8ca739e3 RD |
99 | printk(KERN_INFO "please try 'cgroup_disable=memory' option if you" |
100 | " don't want memory cgroups\n"); | |
52d4b9ac KH |
101 | return; |
102 | fail: | |
8ca739e3 RD |
103 | printk(KERN_CRIT "allocation of page_cgroup failed.\n"); |
104 | printk(KERN_CRIT "please try 'cgroup_disable=memory' boot option\n"); | |
52d4b9ac KH |
105 | panic("Out of memory"); |
106 | } | |
107 | ||
108 | #else /* CONFIG_FLAT_NODE_MEM_MAP */ | |
109 | ||
110 | struct page_cgroup *lookup_page_cgroup(struct page *page) | |
111 | { | |
112 | unsigned long pfn = page_to_pfn(page); | |
113 | struct mem_section *section = __pfn_to_section(pfn); | |
114 | ||
d69b042f BS |
115 | if (!section->page_cgroup) |
116 | return NULL; | |
52d4b9ac KH |
117 | return section->page_cgroup + pfn; |
118 | } | |
119 | ||
6b3ae58e JW |
120 | struct page *lookup_cgroup_page(struct page_cgroup *pc) |
121 | { | |
122 | struct mem_section *section; | |
123 | struct page *page; | |
124 | unsigned long nr; | |
125 | ||
126 | nr = page_cgroup_array_id(pc); | |
127 | section = __nr_to_section(nr); | |
128 | page = pfn_to_page(pc - section->page_cgroup); | |
129 | VM_BUG_ON(pc != lookup_page_cgroup(page)); | |
130 | return page; | |
131 | } | |
132 | ||
268433b8 | 133 | static void *__meminit alloc_page_cgroup(size_t size, int nid) |
dde79e00 MH |
134 | { |
135 | void *addr = NULL; | |
136 | ||
21a3c964 | 137 | addr = alloc_pages_exact_nid(nid, size, GFP_KERNEL | __GFP_NOWARN); |
dde79e00 MH |
138 | if (addr) |
139 | return addr; | |
140 | ||
141 | if (node_state(nid, N_HIGH_MEMORY)) | |
142 | addr = vmalloc_node(size, nid); | |
143 | else | |
144 | addr = vmalloc(size); | |
145 | ||
146 | return addr; | |
147 | } | |
148 | ||
149 | #ifdef CONFIG_MEMORY_HOTPLUG | |
150 | static void free_page_cgroup(void *addr) | |
151 | { | |
152 | if (is_vmalloc_addr(addr)) { | |
153 | vfree(addr); | |
154 | } else { | |
155 | struct page *page = virt_to_page(addr); | |
6cfddb26 MH |
156 | size_t table_size = |
157 | sizeof(struct page_cgroup) * PAGES_PER_SECTION; | |
158 | ||
159 | BUG_ON(PageReserved(page)); | |
160 | free_pages_exact(addr, table_size); | |
dde79e00 MH |
161 | } |
162 | } | |
163 | #endif | |
164 | ||
37573e8c | 165 | static int __meminit init_section_page_cgroup(unsigned long pfn, int nid) |
52d4b9ac | 166 | { |
52d4b9ac | 167 | struct page_cgroup *base, *pc; |
6b3ae58e | 168 | struct mem_section *section; |
52d4b9ac | 169 | unsigned long table_size; |
6b3ae58e | 170 | unsigned long nr; |
37573e8c | 171 | int index; |
52d4b9ac | 172 | |
6b3ae58e JW |
173 | nr = pfn_to_section_nr(pfn); |
174 | section = __nr_to_section(nr); | |
175 | ||
176 | if (section->page_cgroup) | |
177 | return 0; | |
178 | ||
6b3ae58e | 179 | table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION; |
dde79e00 MH |
180 | base = alloc_page_cgroup(table_size, nid); |
181 | ||
6b3ae58e JW |
182 | /* |
183 | * The value stored in section->page_cgroup is (base - pfn) | |
184 | * and it does not point to the memory block allocated above, | |
185 | * causing kmemleak false positives. | |
186 | */ | |
187 | kmemleak_not_leak(base); | |
52d4b9ac KH |
188 | |
189 | if (!base) { | |
190 | printk(KERN_ERR "page cgroup allocation failure\n"); | |
191 | return -ENOMEM; | |
192 | } | |
193 | ||
194 | for (index = 0; index < PAGES_PER_SECTION; index++) { | |
195 | pc = base + index; | |
6b3ae58e | 196 | init_page_cgroup(pc, nr); |
52d4b9ac | 197 | } |
37573e8c KH |
198 | /* |
199 | * The passed "pfn" may not be aligned to SECTION. For the calculation | |
200 | * we need to apply a mask. | |
201 | */ | |
202 | pfn &= PAGE_SECTION_MASK; | |
52d4b9ac KH |
203 | section->page_cgroup = base - pfn; |
204 | total_usage += table_size; | |
205 | return 0; | |
206 | } | |
207 | #ifdef CONFIG_MEMORY_HOTPLUG | |
208 | void __free_page_cgroup(unsigned long pfn) | |
209 | { | |
210 | struct mem_section *ms; | |
211 | struct page_cgroup *base; | |
212 | ||
213 | ms = __pfn_to_section(pfn); | |
214 | if (!ms || !ms->page_cgroup) | |
215 | return; | |
216 | base = ms->page_cgroup + pfn; | |
dde79e00 MH |
217 | free_page_cgroup(base); |
218 | ms->page_cgroup = NULL; | |
52d4b9ac KH |
219 | } |
220 | ||
31168481 | 221 | int __meminit online_page_cgroup(unsigned long start_pfn, |
52d4b9ac KH |
222 | unsigned long nr_pages, |
223 | int nid) | |
224 | { | |
225 | unsigned long start, end, pfn; | |
226 | int fail = 0; | |
227 | ||
1bb36fbd DK |
228 | start = SECTION_ALIGN_DOWN(start_pfn); |
229 | end = SECTION_ALIGN_UP(start_pfn + nr_pages); | |
52d4b9ac | 230 | |
37573e8c KH |
231 | if (nid == -1) { |
232 | /* | |
233 | * In this case, "nid" already exists and contains valid memory. | |
234 | * "start_pfn" passed to us is a pfn which is an arg for | |
235 | * online__pages(), and start_pfn should exist. | |
236 | */ | |
237 | nid = pfn_to_nid(start_pfn); | |
238 | VM_BUG_ON(!node_state(nid, N_ONLINE)); | |
239 | } | |
240 | ||
52d4b9ac KH |
241 | for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) { |
242 | if (!pfn_present(pfn)) | |
243 | continue; | |
37573e8c | 244 | fail = init_section_page_cgroup(pfn, nid); |
52d4b9ac KH |
245 | } |
246 | if (!fail) | |
247 | return 0; | |
248 | ||
249 | /* rollback */ | |
250 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) | |
251 | __free_page_cgroup(pfn); | |
252 | ||
253 | return -ENOMEM; | |
254 | } | |
255 | ||
31168481 | 256 | int __meminit offline_page_cgroup(unsigned long start_pfn, |
52d4b9ac KH |
257 | unsigned long nr_pages, int nid) |
258 | { | |
259 | unsigned long start, end, pfn; | |
260 | ||
1bb36fbd DK |
261 | start = SECTION_ALIGN_DOWN(start_pfn); |
262 | end = SECTION_ALIGN_UP(start_pfn + nr_pages); | |
52d4b9ac KH |
263 | |
264 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) | |
265 | __free_page_cgroup(pfn); | |
266 | return 0; | |
267 | ||
268 | } | |
269 | ||
31168481 | 270 | static int __meminit page_cgroup_callback(struct notifier_block *self, |
52d4b9ac KH |
271 | unsigned long action, void *arg) |
272 | { | |
273 | struct memory_notify *mn = arg; | |
274 | int ret = 0; | |
275 | switch (action) { | |
276 | case MEM_GOING_ONLINE: | |
277 | ret = online_page_cgroup(mn->start_pfn, | |
278 | mn->nr_pages, mn->status_change_nid); | |
279 | break; | |
52d4b9ac KH |
280 | case MEM_OFFLINE: |
281 | offline_page_cgroup(mn->start_pfn, | |
282 | mn->nr_pages, mn->status_change_nid); | |
283 | break; | |
dc19f9db | 284 | case MEM_CANCEL_ONLINE: |
52d4b9ac KH |
285 | case MEM_GOING_OFFLINE: |
286 | break; | |
287 | case MEM_ONLINE: | |
288 | case MEM_CANCEL_OFFLINE: | |
289 | break; | |
290 | } | |
dc19f9db | 291 | |
5fda1bd5 | 292 | return notifier_from_errno(ret); |
52d4b9ac KH |
293 | } |
294 | ||
295 | #endif | |
296 | ||
297 | void __init page_cgroup_init(void) | |
298 | { | |
299 | unsigned long pfn; | |
37573e8c | 300 | int nid; |
52d4b9ac | 301 | |
f8d66542 | 302 | if (mem_cgroup_disabled()) |
94b6da5a KH |
303 | return; |
304 | ||
37573e8c KH |
305 | for_each_node_state(nid, N_HIGH_MEMORY) { |
306 | unsigned long start_pfn, end_pfn; | |
307 | ||
308 | start_pfn = node_start_pfn(nid); | |
309 | end_pfn = node_end_pfn(nid); | |
310 | /* | |
311 | * start_pfn and end_pfn may not be aligned to SECTION and the | |
312 | * page->flags of out of node pages are not initialized. So we | |
313 | * scan [start_pfn, the biggest section's pfn < end_pfn) here. | |
314 | */ | |
315 | for (pfn = start_pfn; | |
316 | pfn < end_pfn; | |
317 | pfn = ALIGN(pfn + 1, PAGES_PER_SECTION)) { | |
318 | ||
319 | if (!pfn_valid(pfn)) | |
320 | continue; | |
321 | /* | |
322 | * Nodes's pfns can be overlapping. | |
323 | * We know some arch can have a nodes layout such as | |
324 | * -------------pfn--------------> | |
325 | * N0 | N1 | N2 | N0 | N1 | N2|.... | |
326 | */ | |
327 | if (pfn_to_nid(pfn) != nid) | |
328 | continue; | |
329 | if (init_section_page_cgroup(pfn, nid)) | |
330 | goto oom; | |
331 | } | |
52d4b9ac | 332 | } |
37573e8c | 333 | hotplug_memory_notifier(page_cgroup_callback, 0); |
52d4b9ac | 334 | printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage); |
37573e8c KH |
335 | printk(KERN_INFO "please try 'cgroup_disable=memory' option if you " |
336 | "don't want memory cgroups\n"); | |
337 | return; | |
338 | oom: | |
339 | printk(KERN_CRIT "try 'cgroup_disable=memory' boot option\n"); | |
340 | panic("Out of memory"); | |
52d4b9ac KH |
341 | } |
342 | ||
31168481 | 343 | void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
52d4b9ac KH |
344 | { |
345 | return; | |
346 | } | |
347 | ||
348 | #endif | |
27a7faa0 KH |
349 | |
350 | ||
351 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP | |
352 | ||
353 | static DEFINE_MUTEX(swap_cgroup_mutex); | |
354 | struct swap_cgroup_ctrl { | |
355 | struct page **map; | |
356 | unsigned long length; | |
e9e58a4e | 357 | spinlock_t lock; |
27a7faa0 KH |
358 | }; |
359 | ||
360 | struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES]; | |
361 | ||
27a7faa0 | 362 | struct swap_cgroup { |
a3b2d692 | 363 | unsigned short id; |
27a7faa0 KH |
364 | }; |
365 | #define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup)) | |
366 | #define SC_POS_MASK (SC_PER_PAGE - 1) | |
367 | ||
368 | /* | |
369 | * SwapCgroup implements "lookup" and "exchange" operations. | |
370 | * In typical usage, this swap_cgroup is accessed via memcg's charge/uncharge | |
371 | * against SwapCache. At swap_free(), this is accessed directly from swap. | |
372 | * | |
373 | * This means, | |
374 | * - we have no race in "exchange" when we're accessed via SwapCache because | |
375 | * SwapCache(and its swp_entry) is under lock. | |
376 | * - When called via swap_free(), there is no user of this entry and no race. | |
377 | * Then, we don't need lock around "exchange". | |
378 | * | |
379 | * TODO: we can push these buffers out to HIGHMEM. | |
380 | */ | |
381 | ||
382 | /* | |
383 | * allocate buffer for swap_cgroup. | |
384 | */ | |
385 | static int swap_cgroup_prepare(int type) | |
386 | { | |
387 | struct page *page; | |
388 | struct swap_cgroup_ctrl *ctrl; | |
389 | unsigned long idx, max; | |
390 | ||
27a7faa0 KH |
391 | ctrl = &swap_cgroup_ctrl[type]; |
392 | ||
393 | for (idx = 0; idx < ctrl->length; idx++) { | |
394 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
395 | if (!page) | |
396 | goto not_enough_page; | |
397 | ctrl->map[idx] = page; | |
398 | } | |
399 | return 0; | |
400 | not_enough_page: | |
401 | max = idx; | |
402 | for (idx = 0; idx < max; idx++) | |
403 | __free_page(ctrl->map[idx]); | |
404 | ||
405 | return -ENOMEM; | |
406 | } | |
407 | ||
02491447 DN |
408 | /** |
409 | * swap_cgroup_cmpxchg - cmpxchg mem_cgroup's id for this swp_entry. | |
410 | * @end: swap entry to be cmpxchged | |
411 | * @old: old id | |
412 | * @new: new id | |
413 | * | |
414 | * Returns old id at success, 0 at failure. | |
25985edc | 415 | * (There is no mem_cgroup using 0 as its id) |
02491447 DN |
416 | */ |
417 | unsigned short swap_cgroup_cmpxchg(swp_entry_t ent, | |
418 | unsigned short old, unsigned short new) | |
419 | { | |
420 | int type = swp_type(ent); | |
421 | unsigned long offset = swp_offset(ent); | |
422 | unsigned long idx = offset / SC_PER_PAGE; | |
423 | unsigned long pos = offset & SC_POS_MASK; | |
424 | struct swap_cgroup_ctrl *ctrl; | |
425 | struct page *mappage; | |
426 | struct swap_cgroup *sc; | |
e9e58a4e KH |
427 | unsigned long flags; |
428 | unsigned short retval; | |
02491447 DN |
429 | |
430 | ctrl = &swap_cgroup_ctrl[type]; | |
431 | ||
432 | mappage = ctrl->map[idx]; | |
433 | sc = page_address(mappage); | |
434 | sc += pos; | |
e9e58a4e KH |
435 | spin_lock_irqsave(&ctrl->lock, flags); |
436 | retval = sc->id; | |
437 | if (retval == old) | |
438 | sc->id = new; | |
02491447 | 439 | else |
e9e58a4e KH |
440 | retval = 0; |
441 | spin_unlock_irqrestore(&ctrl->lock, flags); | |
442 | return retval; | |
02491447 DN |
443 | } |
444 | ||
27a7faa0 KH |
445 | /** |
446 | * swap_cgroup_record - record mem_cgroup for this swp_entry. | |
447 | * @ent: swap entry to be recorded into | |
448 | * @mem: mem_cgroup to be recorded | |
449 | * | |
a3b2d692 KH |
450 | * Returns old value at success, 0 at failure. |
451 | * (Of course, old value can be 0.) | |
27a7faa0 | 452 | */ |
a3b2d692 | 453 | unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id) |
27a7faa0 KH |
454 | { |
455 | int type = swp_type(ent); | |
456 | unsigned long offset = swp_offset(ent); | |
457 | unsigned long idx = offset / SC_PER_PAGE; | |
458 | unsigned long pos = offset & SC_POS_MASK; | |
459 | struct swap_cgroup_ctrl *ctrl; | |
460 | struct page *mappage; | |
461 | struct swap_cgroup *sc; | |
a3b2d692 | 462 | unsigned short old; |
e9e58a4e | 463 | unsigned long flags; |
27a7faa0 | 464 | |
27a7faa0 KH |
465 | ctrl = &swap_cgroup_ctrl[type]; |
466 | ||
467 | mappage = ctrl->map[idx]; | |
468 | sc = page_address(mappage); | |
469 | sc += pos; | |
e9e58a4e KH |
470 | spin_lock_irqsave(&ctrl->lock, flags); |
471 | old = sc->id; | |
472 | sc->id = id; | |
473 | spin_unlock_irqrestore(&ctrl->lock, flags); | |
27a7faa0 KH |
474 | |
475 | return old; | |
476 | } | |
477 | ||
478 | /** | |
479 | * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry | |
480 | * @ent: swap entry to be looked up. | |
481 | * | |
a3b2d692 | 482 | * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID) |
27a7faa0 | 483 | */ |
a3b2d692 | 484 | unsigned short lookup_swap_cgroup(swp_entry_t ent) |
27a7faa0 KH |
485 | { |
486 | int type = swp_type(ent); | |
487 | unsigned long offset = swp_offset(ent); | |
488 | unsigned long idx = offset / SC_PER_PAGE; | |
489 | unsigned long pos = offset & SC_POS_MASK; | |
490 | struct swap_cgroup_ctrl *ctrl; | |
491 | struct page *mappage; | |
492 | struct swap_cgroup *sc; | |
a3b2d692 | 493 | unsigned short ret; |
27a7faa0 | 494 | |
27a7faa0 KH |
495 | ctrl = &swap_cgroup_ctrl[type]; |
496 | mappage = ctrl->map[idx]; | |
497 | sc = page_address(mappage); | |
498 | sc += pos; | |
a3b2d692 | 499 | ret = sc->id; |
27a7faa0 KH |
500 | return ret; |
501 | } | |
502 | ||
503 | int swap_cgroup_swapon(int type, unsigned long max_pages) | |
504 | { | |
505 | void *array; | |
506 | unsigned long array_size; | |
507 | unsigned long length; | |
508 | struct swap_cgroup_ctrl *ctrl; | |
509 | ||
510 | if (!do_swap_account) | |
511 | return 0; | |
512 | ||
33278f7f | 513 | length = DIV_ROUND_UP(max_pages, SC_PER_PAGE); |
27a7faa0 KH |
514 | array_size = length * sizeof(void *); |
515 | ||
8c1fec1b | 516 | array = vzalloc(array_size); |
27a7faa0 KH |
517 | if (!array) |
518 | goto nomem; | |
519 | ||
27a7faa0 KH |
520 | ctrl = &swap_cgroup_ctrl[type]; |
521 | mutex_lock(&swap_cgroup_mutex); | |
522 | ctrl->length = length; | |
523 | ctrl->map = array; | |
e9e58a4e | 524 | spin_lock_init(&ctrl->lock); |
27a7faa0 KH |
525 | if (swap_cgroup_prepare(type)) { |
526 | /* memory shortage */ | |
527 | ctrl->map = NULL; | |
528 | ctrl->length = 0; | |
27a7faa0 | 529 | mutex_unlock(&swap_cgroup_mutex); |
6a5b18d2 | 530 | vfree(array); |
27a7faa0 KH |
531 | goto nomem; |
532 | } | |
533 | mutex_unlock(&swap_cgroup_mutex); | |
534 | ||
27a7faa0 KH |
535 | return 0; |
536 | nomem: | |
537 | printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n"); | |
538 | printk(KERN_INFO | |
00a66d29 | 539 | "swap_cgroup can be disabled by swapaccount=0 boot option\n"); |
27a7faa0 KH |
540 | return -ENOMEM; |
541 | } | |
542 | ||
543 | void swap_cgroup_swapoff(int type) | |
544 | { | |
6a5b18d2 NK |
545 | struct page **map; |
546 | unsigned long i, length; | |
27a7faa0 KH |
547 | struct swap_cgroup_ctrl *ctrl; |
548 | ||
549 | if (!do_swap_account) | |
550 | return; | |
551 | ||
552 | mutex_lock(&swap_cgroup_mutex); | |
553 | ctrl = &swap_cgroup_ctrl[type]; | |
6a5b18d2 NK |
554 | map = ctrl->map; |
555 | length = ctrl->length; | |
556 | ctrl->map = NULL; | |
557 | ctrl->length = 0; | |
558 | mutex_unlock(&swap_cgroup_mutex); | |
559 | ||
560 | if (map) { | |
561 | for (i = 0; i < length; i++) { | |
562 | struct page *page = map[i]; | |
27a7faa0 KH |
563 | if (page) |
564 | __free_page(page); | |
565 | } | |
6a5b18d2 | 566 | vfree(map); |
27a7faa0 | 567 | } |
27a7faa0 KH |
568 | } |
569 | ||
570 | #endif |