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KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -07001#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>
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -07007#include <linux/slab.h>
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -07008#include <linux/memory.h>
Paul Mundt4c8210422008-10-22 14:14:58 -07009#include <linux/vmalloc.h>
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -070010#include <linux/cgroup.h>
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -080011#include <linux/swapops.h>
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070012
13static 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);
KAMEZAWA Hiroyuki08e552c2009-01-07 18:08:01 -080019 INIT_LIST_HEAD(&pc->lru);
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070020}
21static unsigned long total_usage;
22
23#if !defined(CONFIG_SPARSEMEM)
24
25
Al Viro31168482008-11-22 17:33:24 +000026void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070027{
28 pgdat->node_page_cgroup = NULL;
29}
30
31struct 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
45static int __init alloc_node_page_cgroup(int nid)
46{
47 struct page_cgroup *base, *pc;
48 unsigned long table_size;
49 unsigned long start_pfn, nr_pages, index;
50
51 start_pfn = NODE_DATA(nid)->node_start_pfn;
52 nr_pages = NODE_DATA(nid)->node_spanned_pages;
53
KAMEZAWA Hiroyuki653d22c2008-12-09 13:14:20 -080054 if (!nr_pages)
55 return 0;
56
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070057 table_size = sizeof(struct page_cgroup) * nr_pages;
58
59 base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
60 table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
61 if (!base)
62 return -ENOMEM;
63 for (index = 0; index < nr_pages; index++) {
64 pc = base + index;
65 __init_page_cgroup(pc, start_pfn + index);
66 }
67 NODE_DATA(nid)->node_page_cgroup = base;
68 total_usage += table_size;
69 return 0;
70}
71
72void __init page_cgroup_init(void)
73{
74
75 int nid, fail;
76
Hirokazu Takahashif8d66542009-01-07 18:08:02 -080077 if (mem_cgroup_disabled())
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -070078 return;
79
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070080 for_each_online_node(nid) {
81 fail = alloc_node_page_cgroup(nid);
82 if (fail)
83 goto fail;
84 }
85 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
86 printk(KERN_INFO "please try cgroup_disable=memory option if you"
87 " don't want\n");
88 return;
89fail:
90 printk(KERN_CRIT "allocation of page_cgroup was failed.\n");
91 printk(KERN_CRIT "please try cgroup_disable=memory boot option\n");
92 panic("Out of memory");
93}
94
95#else /* CONFIG_FLAT_NODE_MEM_MAP */
96
97struct page_cgroup *lookup_page_cgroup(struct page *page)
98{
99 unsigned long pfn = page_to_pfn(page);
100 struct mem_section *section = __pfn_to_section(pfn);
101
102 return section->page_cgroup + pfn;
103}
104
Al Viro31168482008-11-22 17:33:24 +0000105/* __alloc_bootmem...() is protected by !slab_available() */
KOSAKI Motohirofeb16692009-01-06 14:39:43 -0800106static int __init_refok init_section_page_cgroup(unsigned long pfn)
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700107{
Fernando Luis Vazquez Cao0753b0e2009-01-07 18:07:51 -0800108 struct mem_section *section = __pfn_to_section(pfn);
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700109 struct page_cgroup *base, *pc;
110 unsigned long table_size;
111 int nid, index;
112
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800113 if (!section->page_cgroup) {
114 nid = page_to_nid(pfn_to_page(pfn));
115 table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
116 if (slab_is_available()) {
KAMEZAWA Hiroyuki2e9c2372009-02-11 13:04:29 -0800117 base = kmalloc_node(table_size,
118 GFP_KERNEL | __GFP_NOWARN, nid);
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800119 if (!base)
120 base = vmalloc_node(table_size, nid);
121 } else {
122 base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
123 table_size,
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700124 PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800125 }
126 } else {
127 /*
128 * We don't have to allocate page_cgroup again, but
129 * address of memmap may be changed. So, we have to initialize
130 * again.
131 */
132 base = section->page_cgroup + pfn;
133 table_size = 0;
134 /* check address of memmap is changed or not. */
135 if (base->page == pfn_to_page(pfn))
136 return 0;
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700137 }
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700138
139 if (!base) {
140 printk(KERN_ERR "page cgroup allocation failure\n");
141 return -ENOMEM;
142 }
143
144 for (index = 0; index < PAGES_PER_SECTION; index++) {
145 pc = base + index;
146 __init_page_cgroup(pc, pfn + index);
147 }
148
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700149 section->page_cgroup = base - pfn;
150 total_usage += table_size;
151 return 0;
152}
153#ifdef CONFIG_MEMORY_HOTPLUG
154void __free_page_cgroup(unsigned long pfn)
155{
156 struct mem_section *ms;
157 struct page_cgroup *base;
158
159 ms = __pfn_to_section(pfn);
160 if (!ms || !ms->page_cgroup)
161 return;
162 base = ms->page_cgroup + pfn;
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700163 if (is_vmalloc_addr(base)) {
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700164 vfree(base);
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700165 ms->page_cgroup = NULL;
166 } else {
167 struct page *page = virt_to_page(base);
168 if (!PageReserved(page)) { /* Is bootmem ? */
169 kfree(base);
170 ms->page_cgroup = NULL;
171 }
172 }
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700173}
174
Al Viro31168482008-11-22 17:33:24 +0000175int __meminit online_page_cgroup(unsigned long start_pfn,
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700176 unsigned long nr_pages,
177 int nid)
178{
179 unsigned long start, end, pfn;
180 int fail = 0;
181
KAMEZAWA Hiroyuki33c5d3d2008-11-12 13:27:01 -0800182 start = start_pfn & ~(PAGES_PER_SECTION - 1);
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700183 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
184
185 for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
186 if (!pfn_present(pfn))
187 continue;
188 fail = init_section_page_cgroup(pfn);
189 }
190 if (!fail)
191 return 0;
192
193 /* rollback */
194 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
195 __free_page_cgroup(pfn);
196
197 return -ENOMEM;
198}
199
Al Viro31168482008-11-22 17:33:24 +0000200int __meminit offline_page_cgroup(unsigned long start_pfn,
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700201 unsigned long nr_pages, int nid)
202{
203 unsigned long start, end, pfn;
204
KAMEZAWA Hiroyuki33c5d3d2008-11-12 13:27:01 -0800205 start = start_pfn & ~(PAGES_PER_SECTION - 1);
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700206 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
207
208 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
209 __free_page_cgroup(pfn);
210 return 0;
211
212}
213
Al Viro31168482008-11-22 17:33:24 +0000214static int __meminit page_cgroup_callback(struct notifier_block *self,
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700215 unsigned long action, void *arg)
216{
217 struct memory_notify *mn = arg;
218 int ret = 0;
219 switch (action) {
220 case MEM_GOING_ONLINE:
221 ret = online_page_cgroup(mn->start_pfn,
222 mn->nr_pages, mn->status_change_nid);
223 break;
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700224 case MEM_OFFLINE:
225 offline_page_cgroup(mn->start_pfn,
226 mn->nr_pages, mn->status_change_nid);
227 break;
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800228 case MEM_CANCEL_ONLINE:
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700229 case MEM_GOING_OFFLINE:
230 break;
231 case MEM_ONLINE:
232 case MEM_CANCEL_OFFLINE:
233 break;
234 }
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800235
236 if (ret)
237 ret = notifier_from_errno(ret);
238 else
239 ret = NOTIFY_OK;
240
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700241 return ret;
242}
243
244#endif
245
246void __init page_cgroup_init(void)
247{
248 unsigned long pfn;
249 int fail = 0;
250
Hirokazu Takahashif8d66542009-01-07 18:08:02 -0800251 if (mem_cgroup_disabled())
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700252 return;
253
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700254 for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
255 if (!pfn_present(pfn))
256 continue;
257 fail = init_section_page_cgroup(pfn);
258 }
259 if (fail) {
260 printk(KERN_CRIT "try cgroup_disable=memory boot option\n");
261 panic("Out of memory");
262 } else {
263 hotplug_memory_notifier(page_cgroup_callback, 0);
264 }
265 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
266 printk(KERN_INFO "please try cgroup_disable=memory option if you don't"
267 " want\n");
268}
269
Al Viro31168482008-11-22 17:33:24 +0000270void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700271{
272 return;
273}
274
275#endif
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800276
277
278#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
279
280static DEFINE_MUTEX(swap_cgroup_mutex);
281struct swap_cgroup_ctrl {
282 struct page **map;
283 unsigned long length;
284};
285
286struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES];
287
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800288struct swap_cgroup {
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700289 unsigned short id;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800290};
291#define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup))
292#define SC_POS_MASK (SC_PER_PAGE - 1)
293
294/*
295 * SwapCgroup implements "lookup" and "exchange" operations.
296 * In typical usage, this swap_cgroup is accessed via memcg's charge/uncharge
297 * against SwapCache. At swap_free(), this is accessed directly from swap.
298 *
299 * This means,
300 * - we have no race in "exchange" when we're accessed via SwapCache because
301 * SwapCache(and its swp_entry) is under lock.
302 * - When called via swap_free(), there is no user of this entry and no race.
303 * Then, we don't need lock around "exchange".
304 *
305 * TODO: we can push these buffers out to HIGHMEM.
306 */
307
308/*
309 * allocate buffer for swap_cgroup.
310 */
311static int swap_cgroup_prepare(int type)
312{
313 struct page *page;
314 struct swap_cgroup_ctrl *ctrl;
315 unsigned long idx, max;
316
317 if (!do_swap_account)
318 return 0;
319 ctrl = &swap_cgroup_ctrl[type];
320
321 for (idx = 0; idx < ctrl->length; idx++) {
322 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
323 if (!page)
324 goto not_enough_page;
325 ctrl->map[idx] = page;
326 }
327 return 0;
328not_enough_page:
329 max = idx;
330 for (idx = 0; idx < max; idx++)
331 __free_page(ctrl->map[idx]);
332
333 return -ENOMEM;
334}
335
336/**
337 * swap_cgroup_record - record mem_cgroup for this swp_entry.
338 * @ent: swap entry to be recorded into
339 * @mem: mem_cgroup to be recorded
340 *
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700341 * Returns old value at success, 0 at failure.
342 * (Of course, old value can be 0.)
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800343 */
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700344unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800345{
346 int type = swp_type(ent);
347 unsigned long offset = swp_offset(ent);
348 unsigned long idx = offset / SC_PER_PAGE;
349 unsigned long pos = offset & SC_POS_MASK;
350 struct swap_cgroup_ctrl *ctrl;
351 struct page *mappage;
352 struct swap_cgroup *sc;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700353 unsigned short old;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800354
355 if (!do_swap_account)
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700356 return 0;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800357
358 ctrl = &swap_cgroup_ctrl[type];
359
360 mappage = ctrl->map[idx];
361 sc = page_address(mappage);
362 sc += pos;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700363 old = sc->id;
364 sc->id = id;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800365
366 return old;
367}
368
369/**
370 * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry
371 * @ent: swap entry to be looked up.
372 *
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700373 * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800374 */
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700375unsigned short lookup_swap_cgroup(swp_entry_t ent)
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800376{
377 int type = swp_type(ent);
378 unsigned long offset = swp_offset(ent);
379 unsigned long idx = offset / SC_PER_PAGE;
380 unsigned long pos = offset & SC_POS_MASK;
381 struct swap_cgroup_ctrl *ctrl;
382 struct page *mappage;
383 struct swap_cgroup *sc;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700384 unsigned short ret;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800385
386 if (!do_swap_account)
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700387 return 0;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800388
389 ctrl = &swap_cgroup_ctrl[type];
390 mappage = ctrl->map[idx];
391 sc = page_address(mappage);
392 sc += pos;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700393 ret = sc->id;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800394 return ret;
395}
396
397int swap_cgroup_swapon(int type, unsigned long max_pages)
398{
399 void *array;
400 unsigned long array_size;
401 unsigned long length;
402 struct swap_cgroup_ctrl *ctrl;
403
404 if (!do_swap_account)
405 return 0;
406
407 length = ((max_pages/SC_PER_PAGE) + 1);
408 array_size = length * sizeof(void *);
409
410 array = vmalloc(array_size);
411 if (!array)
412 goto nomem;
413
414 memset(array, 0, array_size);
415 ctrl = &swap_cgroup_ctrl[type];
416 mutex_lock(&swap_cgroup_mutex);
417 ctrl->length = length;
418 ctrl->map = array;
419 if (swap_cgroup_prepare(type)) {
420 /* memory shortage */
421 ctrl->map = NULL;
422 ctrl->length = 0;
423 vfree(array);
424 mutex_unlock(&swap_cgroup_mutex);
425 goto nomem;
426 }
427 mutex_unlock(&swap_cgroup_mutex);
428
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800429 return 0;
430nomem:
431 printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n");
432 printk(KERN_INFO
433 "swap_cgroup can be disabled by noswapaccount boot option\n");
434 return -ENOMEM;
435}
436
437void swap_cgroup_swapoff(int type)
438{
439 int i;
440 struct swap_cgroup_ctrl *ctrl;
441
442 if (!do_swap_account)
443 return;
444
445 mutex_lock(&swap_cgroup_mutex);
446 ctrl = &swap_cgroup_ctrl[type];
447 if (ctrl->map) {
448 for (i = 0; i < ctrl->length; i++) {
449 struct page *page = ctrl->map[i];
450 if (page)
451 __free_page(page);
452 }
453 vfree(ctrl->map);
454 ctrl->map = NULL;
455 ctrl->length = 0;
456 }
457 mutex_unlock(&swap_cgroup_mutex);
458}
459
460#endif