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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> |
52d4b9ac KH |
12 | |
13 | static void __meminit | |
14 | __init_page_cgroup(struct page_cgroup *pc, unsigned long pfn) | |
15 | { | |
16 | pc->flags = 0; | |
17 | pc->mem_cgroup = NULL; | |
18 | pc->page = pfn_to_page(pfn); | |
19 | } | |
20 | static unsigned long total_usage; | |
21 | ||
22 | #if !defined(CONFIG_SPARSEMEM) | |
23 | ||
24 | ||
31168481 | 25 | void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
52d4b9ac KH |
26 | { |
27 | pgdat->node_page_cgroup = NULL; | |
28 | } | |
29 | ||
30 | struct page_cgroup *lookup_page_cgroup(struct page *page) | |
31 | { | |
32 | unsigned long pfn = page_to_pfn(page); | |
33 | unsigned long offset; | |
34 | struct page_cgroup *base; | |
35 | ||
36 | base = NODE_DATA(page_to_nid(page))->node_page_cgroup; | |
37 | if (unlikely(!base)) | |
38 | return NULL; | |
39 | ||
40 | offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn; | |
41 | return base + offset; | |
42 | } | |
43 | ||
44 | static int __init alloc_node_page_cgroup(int nid) | |
45 | { | |
46 | struct page_cgroup *base, *pc; | |
47 | unsigned long table_size; | |
48 | unsigned long start_pfn, nr_pages, index; | |
49 | ||
50 | start_pfn = NODE_DATA(nid)->node_start_pfn; | |
51 | nr_pages = NODE_DATA(nid)->node_spanned_pages; | |
52 | ||
653d22c0 KH |
53 | if (!nr_pages) |
54 | return 0; | |
55 | ||
52d4b9ac KH |
56 | table_size = sizeof(struct page_cgroup) * nr_pages; |
57 | ||
58 | base = __alloc_bootmem_node_nopanic(NODE_DATA(nid), | |
59 | table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); | |
60 | if (!base) | |
61 | return -ENOMEM; | |
62 | for (index = 0; index < nr_pages; index++) { | |
63 | pc = base + index; | |
64 | __init_page_cgroup(pc, start_pfn + index); | |
65 | } | |
66 | NODE_DATA(nid)->node_page_cgroup = base; | |
67 | total_usage += table_size; | |
68 | return 0; | |
69 | } | |
70 | ||
71 | void __init page_cgroup_init(void) | |
72 | { | |
73 | ||
74 | int nid, fail; | |
75 | ||
94b6da5a KH |
76 | if (mem_cgroup_subsys.disabled) |
77 | return; | |
78 | ||
52d4b9ac KH |
79 | for_each_online_node(nid) { |
80 | fail = alloc_node_page_cgroup(nid); | |
81 | if (fail) | |
82 | goto fail; | |
83 | } | |
84 | printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage); | |
85 | printk(KERN_INFO "please try cgroup_disable=memory option if you" | |
86 | " don't want\n"); | |
87 | return; | |
88 | fail: | |
89 | printk(KERN_CRIT "allocation of page_cgroup was failed.\n"); | |
90 | printk(KERN_CRIT "please try cgroup_disable=memory boot option\n"); | |
91 | panic("Out of memory"); | |
92 | } | |
93 | ||
94 | #else /* CONFIG_FLAT_NODE_MEM_MAP */ | |
95 | ||
96 | struct page_cgroup *lookup_page_cgroup(struct page *page) | |
97 | { | |
98 | unsigned long pfn = page_to_pfn(page); | |
99 | struct mem_section *section = __pfn_to_section(pfn); | |
100 | ||
101 | return section->page_cgroup + pfn; | |
102 | } | |
103 | ||
31168481 | 104 | /* __alloc_bootmem...() is protected by !slab_available() */ |
feb16694 | 105 | static int __init_refok init_section_page_cgroup(unsigned long pfn) |
52d4b9ac | 106 | { |
0753b0ef | 107 | struct mem_section *section = __pfn_to_section(pfn); |
52d4b9ac KH |
108 | struct page_cgroup *base, *pc; |
109 | unsigned long table_size; | |
110 | int nid, index; | |
111 | ||
dc19f9db KH |
112 | if (!section->page_cgroup) { |
113 | nid = page_to_nid(pfn_to_page(pfn)); | |
114 | table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION; | |
115 | if (slab_is_available()) { | |
116 | base = kmalloc_node(table_size, GFP_KERNEL, nid); | |
117 | if (!base) | |
118 | base = vmalloc_node(table_size, nid); | |
119 | } else { | |
120 | base = __alloc_bootmem_node_nopanic(NODE_DATA(nid), | |
121 | table_size, | |
94b6da5a | 122 | PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); |
dc19f9db KH |
123 | } |
124 | } else { | |
125 | /* | |
126 | * We don't have to allocate page_cgroup again, but | |
127 | * address of memmap may be changed. So, we have to initialize | |
128 | * again. | |
129 | */ | |
130 | base = section->page_cgroup + pfn; | |
131 | table_size = 0; | |
132 | /* check address of memmap is changed or not. */ | |
133 | if (base->page == pfn_to_page(pfn)) | |
134 | return 0; | |
94b6da5a | 135 | } |
52d4b9ac KH |
136 | |
137 | if (!base) { | |
138 | printk(KERN_ERR "page cgroup allocation failure\n"); | |
139 | return -ENOMEM; | |
140 | } | |
141 | ||
142 | for (index = 0; index < PAGES_PER_SECTION; index++) { | |
143 | pc = base + index; | |
144 | __init_page_cgroup(pc, pfn + index); | |
145 | } | |
146 | ||
52d4b9ac KH |
147 | section->page_cgroup = base - pfn; |
148 | total_usage += table_size; | |
149 | return 0; | |
150 | } | |
151 | #ifdef CONFIG_MEMORY_HOTPLUG | |
152 | void __free_page_cgroup(unsigned long pfn) | |
153 | { | |
154 | struct mem_section *ms; | |
155 | struct page_cgroup *base; | |
156 | ||
157 | ms = __pfn_to_section(pfn); | |
158 | if (!ms || !ms->page_cgroup) | |
159 | return; | |
160 | base = ms->page_cgroup + pfn; | |
94b6da5a | 161 | if (is_vmalloc_addr(base)) { |
52d4b9ac | 162 | vfree(base); |
94b6da5a KH |
163 | ms->page_cgroup = NULL; |
164 | } else { | |
165 | struct page *page = virt_to_page(base); | |
166 | if (!PageReserved(page)) { /* Is bootmem ? */ | |
167 | kfree(base); | |
168 | ms->page_cgroup = NULL; | |
169 | } | |
170 | } | |
52d4b9ac KH |
171 | } |
172 | ||
31168481 | 173 | int __meminit online_page_cgroup(unsigned long start_pfn, |
52d4b9ac KH |
174 | unsigned long nr_pages, |
175 | int nid) | |
176 | { | |
177 | unsigned long start, end, pfn; | |
178 | int fail = 0; | |
179 | ||
33c5d3d6 | 180 | start = start_pfn & ~(PAGES_PER_SECTION - 1); |
52d4b9ac KH |
181 | end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION); |
182 | ||
183 | for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) { | |
184 | if (!pfn_present(pfn)) | |
185 | continue; | |
186 | fail = init_section_page_cgroup(pfn); | |
187 | } | |
188 | if (!fail) | |
189 | return 0; | |
190 | ||
191 | /* rollback */ | |
192 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) | |
193 | __free_page_cgroup(pfn); | |
194 | ||
195 | return -ENOMEM; | |
196 | } | |
197 | ||
31168481 | 198 | int __meminit offline_page_cgroup(unsigned long start_pfn, |
52d4b9ac KH |
199 | unsigned long nr_pages, int nid) |
200 | { | |
201 | unsigned long start, end, pfn; | |
202 | ||
33c5d3d6 | 203 | start = start_pfn & ~(PAGES_PER_SECTION - 1); |
52d4b9ac KH |
204 | end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION); |
205 | ||
206 | for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) | |
207 | __free_page_cgroup(pfn); | |
208 | return 0; | |
209 | ||
210 | } | |
211 | ||
31168481 | 212 | static int __meminit page_cgroup_callback(struct notifier_block *self, |
52d4b9ac KH |
213 | unsigned long action, void *arg) |
214 | { | |
215 | struct memory_notify *mn = arg; | |
216 | int ret = 0; | |
217 | switch (action) { | |
218 | case MEM_GOING_ONLINE: | |
219 | ret = online_page_cgroup(mn->start_pfn, | |
220 | mn->nr_pages, mn->status_change_nid); | |
221 | break; | |
52d4b9ac KH |
222 | case MEM_OFFLINE: |
223 | offline_page_cgroup(mn->start_pfn, | |
224 | mn->nr_pages, mn->status_change_nid); | |
225 | break; | |
dc19f9db | 226 | case MEM_CANCEL_ONLINE: |
52d4b9ac KH |
227 | case MEM_GOING_OFFLINE: |
228 | break; | |
229 | case MEM_ONLINE: | |
230 | case MEM_CANCEL_OFFLINE: | |
231 | break; | |
232 | } | |
dc19f9db KH |
233 | |
234 | if (ret) | |
235 | ret = notifier_from_errno(ret); | |
236 | else | |
237 | ret = NOTIFY_OK; | |
238 | ||
52d4b9ac KH |
239 | return ret; |
240 | } | |
241 | ||
242 | #endif | |
243 | ||
244 | void __init page_cgroup_init(void) | |
245 | { | |
246 | unsigned long pfn; | |
247 | int fail = 0; | |
248 | ||
94b6da5a KH |
249 | if (mem_cgroup_subsys.disabled) |
250 | return; | |
251 | ||
52d4b9ac KH |
252 | for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) { |
253 | if (!pfn_present(pfn)) | |
254 | continue; | |
255 | fail = init_section_page_cgroup(pfn); | |
256 | } | |
257 | if (fail) { | |
258 | printk(KERN_CRIT "try cgroup_disable=memory boot option\n"); | |
259 | panic("Out of memory"); | |
260 | } else { | |
261 | hotplug_memory_notifier(page_cgroup_callback, 0); | |
262 | } | |
263 | printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage); | |
264 | printk(KERN_INFO "please try cgroup_disable=memory option if you don't" | |
265 | " want\n"); | |
266 | } | |
267 | ||
31168481 | 268 | void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat) |
52d4b9ac KH |
269 | { |
270 | return; | |
271 | } | |
272 | ||
273 | #endif | |
27a7faa0 KH |
274 | |
275 | ||
276 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP | |
277 | ||
278 | static DEFINE_MUTEX(swap_cgroup_mutex); | |
279 | struct swap_cgroup_ctrl { | |
280 | struct page **map; | |
281 | unsigned long length; | |
282 | }; | |
283 | ||
284 | struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES]; | |
285 | ||
286 | /* | |
287 | * This 8bytes seems big..maybe we can reduce this when we can use "id" for | |
288 | * cgroup rather than pointer. | |
289 | */ | |
290 | struct swap_cgroup { | |
291 | struct mem_cgroup *val; | |
292 | }; | |
293 | #define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup)) | |
294 | #define SC_POS_MASK (SC_PER_PAGE - 1) | |
295 | ||
296 | /* | |
297 | * SwapCgroup implements "lookup" and "exchange" operations. | |
298 | * In typical usage, this swap_cgroup is accessed via memcg's charge/uncharge | |
299 | * against SwapCache. At swap_free(), this is accessed directly from swap. | |
300 | * | |
301 | * This means, | |
302 | * - we have no race in "exchange" when we're accessed via SwapCache because | |
303 | * SwapCache(and its swp_entry) is under lock. | |
304 | * - When called via swap_free(), there is no user of this entry and no race. | |
305 | * Then, we don't need lock around "exchange". | |
306 | * | |
307 | * TODO: we can push these buffers out to HIGHMEM. | |
308 | */ | |
309 | ||
310 | /* | |
311 | * allocate buffer for swap_cgroup. | |
312 | */ | |
313 | static int swap_cgroup_prepare(int type) | |
314 | { | |
315 | struct page *page; | |
316 | struct swap_cgroup_ctrl *ctrl; | |
317 | unsigned long idx, max; | |
318 | ||
319 | if (!do_swap_account) | |
320 | return 0; | |
321 | ctrl = &swap_cgroup_ctrl[type]; | |
322 | ||
323 | for (idx = 0; idx < ctrl->length; idx++) { | |
324 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
325 | if (!page) | |
326 | goto not_enough_page; | |
327 | ctrl->map[idx] = page; | |
328 | } | |
329 | return 0; | |
330 | not_enough_page: | |
331 | max = idx; | |
332 | for (idx = 0; idx < max; idx++) | |
333 | __free_page(ctrl->map[idx]); | |
334 | ||
335 | return -ENOMEM; | |
336 | } | |
337 | ||
338 | /** | |
339 | * swap_cgroup_record - record mem_cgroup for this swp_entry. | |
340 | * @ent: swap entry to be recorded into | |
341 | * @mem: mem_cgroup to be recorded | |
342 | * | |
343 | * Returns old value at success, NULL at failure. | |
344 | * (Of course, old value can be NULL.) | |
345 | */ | |
346 | struct mem_cgroup *swap_cgroup_record(swp_entry_t ent, struct mem_cgroup *mem) | |
347 | { | |
348 | int type = swp_type(ent); | |
349 | unsigned long offset = swp_offset(ent); | |
350 | unsigned long idx = offset / SC_PER_PAGE; | |
351 | unsigned long pos = offset & SC_POS_MASK; | |
352 | struct swap_cgroup_ctrl *ctrl; | |
353 | struct page *mappage; | |
354 | struct swap_cgroup *sc; | |
355 | struct mem_cgroup *old; | |
356 | ||
357 | if (!do_swap_account) | |
358 | return NULL; | |
359 | ||
360 | ctrl = &swap_cgroup_ctrl[type]; | |
361 | ||
362 | mappage = ctrl->map[idx]; | |
363 | sc = page_address(mappage); | |
364 | sc += pos; | |
365 | old = sc->val; | |
366 | sc->val = mem; | |
367 | ||
368 | return old; | |
369 | } | |
370 | ||
371 | /** | |
372 | * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry | |
373 | * @ent: swap entry to be looked up. | |
374 | * | |
375 | * Returns pointer to mem_cgroup at success. NULL at failure. | |
376 | */ | |
377 | struct mem_cgroup *lookup_swap_cgroup(swp_entry_t ent) | |
378 | { | |
379 | int type = swp_type(ent); | |
380 | unsigned long offset = swp_offset(ent); | |
381 | unsigned long idx = offset / SC_PER_PAGE; | |
382 | unsigned long pos = offset & SC_POS_MASK; | |
383 | struct swap_cgroup_ctrl *ctrl; | |
384 | struct page *mappage; | |
385 | struct swap_cgroup *sc; | |
386 | struct mem_cgroup *ret; | |
387 | ||
388 | if (!do_swap_account) | |
389 | return NULL; | |
390 | ||
391 | ctrl = &swap_cgroup_ctrl[type]; | |
392 | mappage = ctrl->map[idx]; | |
393 | sc = page_address(mappage); | |
394 | sc += pos; | |
395 | ret = sc->val; | |
396 | return ret; | |
397 | } | |
398 | ||
399 | int swap_cgroup_swapon(int type, unsigned long max_pages) | |
400 | { | |
401 | void *array; | |
402 | unsigned long array_size; | |
403 | unsigned long length; | |
404 | struct swap_cgroup_ctrl *ctrl; | |
405 | ||
406 | if (!do_swap_account) | |
407 | return 0; | |
408 | ||
409 | length = ((max_pages/SC_PER_PAGE) + 1); | |
410 | array_size = length * sizeof(void *); | |
411 | ||
412 | array = vmalloc(array_size); | |
413 | if (!array) | |
414 | goto nomem; | |
415 | ||
416 | memset(array, 0, array_size); | |
417 | ctrl = &swap_cgroup_ctrl[type]; | |
418 | mutex_lock(&swap_cgroup_mutex); | |
419 | ctrl->length = length; | |
420 | ctrl->map = array; | |
421 | if (swap_cgroup_prepare(type)) { | |
422 | /* memory shortage */ | |
423 | ctrl->map = NULL; | |
424 | ctrl->length = 0; | |
425 | vfree(array); | |
426 | mutex_unlock(&swap_cgroup_mutex); | |
427 | goto nomem; | |
428 | } | |
429 | mutex_unlock(&swap_cgroup_mutex); | |
430 | ||
431 | printk(KERN_INFO | |
432 | "swap_cgroup: uses %ld bytes of vmalloc for pointer array space" | |
433 | " and %ld bytes to hold mem_cgroup pointers on swap\n", | |
434 | array_size, length * PAGE_SIZE); | |
435 | printk(KERN_INFO | |
436 | "swap_cgroup can be disabled by noswapaccount boot option.\n"); | |
437 | ||
438 | return 0; | |
439 | nomem: | |
440 | printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n"); | |
441 | printk(KERN_INFO | |
442 | "swap_cgroup can be disabled by noswapaccount boot option\n"); | |
443 | return -ENOMEM; | |
444 | } | |
445 | ||
446 | void swap_cgroup_swapoff(int type) | |
447 | { | |
448 | int i; | |
449 | struct swap_cgroup_ctrl *ctrl; | |
450 | ||
451 | if (!do_swap_account) | |
452 | return; | |
453 | ||
454 | mutex_lock(&swap_cgroup_mutex); | |
455 | ctrl = &swap_cgroup_ctrl[type]; | |
456 | if (ctrl->map) { | |
457 | for (i = 0; i < ctrl->length; i++) { | |
458 | struct page *page = ctrl->map[i]; | |
459 | if (page) | |
460 | __free_page(page); | |
461 | } | |
462 | vfree(ctrl->map); | |
463 | ctrl->map = NULL; | |
464 | ctrl->length = 0; | |
465 | } | |
466 | mutex_unlock(&swap_cgroup_mutex); | |
467 | } | |
468 | ||
469 | #endif |