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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> |
7 | #include <linux/slab.h> |
8 | #include <linux/memory.h> |
9 | #include <linux/vmalloc.h> |
10 | #include <linux/cgroup.h> |
11 | #include <linux/swapops.h> |
12 | #include <linux/kmemleak.h> |
13 | |
14 | static 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); |
20 | INIT_LIST_HEAD(&pc->lru); |
21 | } |
22 | static unsigned long total_usage; |
23 | |
24 | #if !defined(CONFIG_SPARSEMEM) |
25 | |
26 | |
27 | void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
28 | { |
29 | pgdat->node_page_cgroup = NULL; |
30 | } |
31 | |
32 | struct 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 | |
46 | static 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 | |
55 | if (!nr_pages) |
56 | return 0; |
57 | |
58 | table_size = sizeof(struct page_cgroup) * nr_pages; |
59 | |
60 | base = __alloc_bootmem_node_nopanic(NODE_DATA(nid), |
61 | table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); |
62 | if (!base) |
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 | |
73 | void __init page_cgroup_init_flatmem(void) |
74 | { |
75 | |
76 | int nid, fail; |
77 | |
78 | if (mem_cgroup_disabled()) |
79 | return; |
80 | |
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); |
87 | printk(KERN_INFO "please try 'cgroup_disable=memory' option if you" |
88 | " don't want memory cgroups\n"); |
89 | return; |
90 | fail: |
91 | printk(KERN_CRIT "allocation of page_cgroup failed.\n"); |
92 | printk(KERN_CRIT "please try 'cgroup_disable=memory' boot option\n"); |
93 | panic("Out of memory"); |
94 | } |
95 | |
96 | #else /* CONFIG_FLAT_NODE_MEM_MAP */ |
97 | |
98 | struct 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 | |
103 | if (!section->page_cgroup) |
104 | return NULL; |
105 | return section->page_cgroup + pfn; |
106 | } |
107 | |
108 | /* __alloc_bootmem...() is protected by !slab_available() */ |
109 | static int __init_refok init_section_page_cgroup(unsigned long pfn) |
110 | { |
111 | struct mem_section *section = __pfn_to_section(pfn); |
112 | struct page_cgroup *base, *pc; |
113 | unsigned long table_size; |
114 | int nid, index; |
115 | |
116 | if (!section->page_cgroup) { |
117 | nid = page_to_nid(pfn_to_page(pfn)); |
118 | table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION; |
119 | VM_BUG_ON(!slab_is_available()); |
120 | if (node_state(nid, N_HIGH_MEMORY)) { |
121 | base = kmalloc_node(table_size, |
122 | GFP_KERNEL | __GFP_NOWARN, nid); |
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 | } |
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); |
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; |
147 | } |
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 | |
159 | section->page_cgroup = base - pfn; |
160 | total_usage += table_size; |
161 | return 0; |
162 | } |
163 | #ifdef CONFIG_MEMORY_HOTPLUG |
164 | void __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; |
173 | if (is_vmalloc_addr(base)) { |
174 | vfree(base); |
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 | } |
183 | } |
184 | |
185 | int __meminit online_page_cgroup(unsigned long start_pfn, |
186 | unsigned long nr_pages, |
187 | int nid) |
188 | { |
189 | unsigned long start, end, pfn; |
190 | int fail = 0; |
191 | |
192 | start = start_pfn & ~(PAGES_PER_SECTION - 1); |
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 | |
210 | int __meminit offline_page_cgroup(unsigned long start_pfn, |
211 | unsigned long nr_pages, int nid) |
212 | { |
213 | unsigned long start, end, pfn; |
214 | |
215 | start = start_pfn & ~(PAGES_PER_SECTION - 1); |
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 | |
224 | static int __meminit page_cgroup_callback(struct notifier_block *self, |
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; |
234 | case MEM_OFFLINE: |
235 | offline_page_cgroup(mn->start_pfn, |
236 | mn->nr_pages, mn->status_change_nid); |
237 | break; |
238 | case MEM_CANCEL_ONLINE: |
239 | case MEM_GOING_OFFLINE: |
240 | break; |
241 | case MEM_ONLINE: |
242 | case MEM_CANCEL_OFFLINE: |
243 | break; |
244 | } |
245 | |
246 | if (ret) |
247 | ret = notifier_from_errno(ret); |
248 | else |
249 | ret = NOTIFY_OK; |
250 | |
251 | return ret; |
252 | } |
253 | |
254 | #endif |
255 | |
256 | void __init page_cgroup_init(void) |
257 | { |
258 | unsigned long pfn; |
259 | int fail = 0; |
260 | |
261 | if (mem_cgroup_disabled()) |
262 | return; |
263 | |
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) { |
270 | printk(KERN_CRIT "try 'cgroup_disable=memory' boot option\n"); |
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); |
276 | printk(KERN_INFO "please try 'cgroup_disable=memory' option if you don't" |
277 | " want memory cgroups\n"); |
278 | } |
279 | |
280 | void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
281 | { |
282 | return; |
283 | } |
284 | |
285 | #endif |
286 | |
287 | |
288 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
289 | |
290 | static DEFINE_MUTEX(swap_cgroup_mutex); |
291 | struct swap_cgroup_ctrl { |
292 | struct page **map; |
293 | unsigned long length; |
294 | spinlock_t lock; |
295 | }; |
296 | |
297 | struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES]; |
298 | |
299 | struct swap_cgroup { |
300 | unsigned short id; |
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 | */ |
322 | static int swap_cgroup_prepare(int type) |
323 | { |
324 | struct page *page; |
325 | struct swap_cgroup_ctrl *ctrl; |
326 | unsigned long idx, max; |
327 | |
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; |
337 | not_enough_page: |
338 | max = idx; |
339 | for (idx = 0; idx < max; idx++) |
340 | __free_page(ctrl->map[idx]); |
341 | |
342 | return -ENOMEM; |
343 | } |
344 | |
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 | */ |
354 | unsigned 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; |
364 | unsigned long flags; |
365 | unsigned short retval; |
366 | |
367 | ctrl = &swap_cgroup_ctrl[type]; |
368 | |
369 | mappage = ctrl->map[idx]; |
370 | sc = page_address(mappage); |
371 | sc += pos; |
372 | spin_lock_irqsave(&ctrl->lock, flags); |
373 | retval = sc->id; |
374 | if (retval == old) |
375 | sc->id = new; |
376 | else |
377 | retval = 0; |
378 | spin_unlock_irqrestore(&ctrl->lock, flags); |
379 | return retval; |
380 | } |
381 | |
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 | * |
387 | * Returns old value at success, 0 at failure. |
388 | * (Of course, old value can be 0.) |
389 | */ |
390 | unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id) |
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; |
399 | unsigned short old; |
400 | unsigned long flags; |
401 | |
402 | ctrl = &swap_cgroup_ctrl[type]; |
403 | |
404 | mappage = ctrl->map[idx]; |
405 | sc = page_address(mappage); |
406 | sc += pos; |
407 | spin_lock_irqsave(&ctrl->lock, flags); |
408 | old = sc->id; |
409 | sc->id = id; |
410 | spin_unlock_irqrestore(&ctrl->lock, flags); |
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 | * |
419 | * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID) |
420 | */ |
421 | unsigned short lookup_swap_cgroup(swp_entry_t ent) |
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; |
430 | unsigned short ret; |
431 | |
432 | ctrl = &swap_cgroup_ctrl[type]; |
433 | mappage = ctrl->map[idx]; |
434 | sc = page_address(mappage); |
435 | sc += pos; |
436 | ret = sc->id; |
437 | return ret; |
438 | } |
439 | |
440 | int 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; |
462 | spin_lock_init(&ctrl->lock); |
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 | |
473 | return 0; |
474 | nomem: |
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 | |
481 | void 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 |
505 |
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