blob: f22b4ebbd8dc7a94680844ce214c5ff2fd2c1467 [file] [log] [blame]
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;
KAMEZAWA Hiroyukica371c02009-06-12 10:33:53 +030058
59 base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
60 table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
61 if (!base)
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070062 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
KAMEZAWA Hiroyukica371c02009-06-12 10:33:53 +030072void __init page_cgroup_init_flatmem(void)
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070073{
74
75 int nid, fail;
76
Hirokazu Takahashif8d665422009-01-07 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);
Randy Dunlap8ca739e2009-06-17 16:26:32 -070086 printk(KERN_INFO "please try 'cgroup_disable=memory' option if you"
87 " don't want memory cgroups\n");
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070088 return;
89fail:
Randy Dunlap8ca739e2009-06-17 16:26:32 -070090 printk(KERN_CRIT "allocation of page_cgroup failed.\n");
91 printk(KERN_CRIT "please try 'cgroup_disable=memory' boot option\n");
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070092 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
Balbir Singhd69b0422009-06-17 16:26:34 -0700102 if (!section->page_cgroup)
103 return NULL;
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700104 return section->page_cgroup + pfn;
105}
106
Al Viro31168482008-11-22 17:33:24 +0000107/* __alloc_bootmem...() is protected by !slab_available() */
KOSAKI Motohirofeb16692009-01-06 14:39:43 -0800108static int __init_refok init_section_page_cgroup(unsigned long pfn)
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700109{
Fernando Luis Vazquez Cao0753b0e2009-01-07 18:07:51 -0800110 struct mem_section *section = __pfn_to_section(pfn);
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700111 struct page_cgroup *base, *pc;
112 unsigned long table_size;
113 int nid, index;
114
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800115 if (!section->page_cgroup) {
116 nid = page_to_nid(pfn_to_page(pfn));
117 table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
KAMEZAWA Hiroyukica371c02009-06-12 10:33:53 +0300118 VM_BUG_ON(!slab_is_available());
119 base = kmalloc_node(table_size,
120 GFP_KERNEL | __GFP_NOWARN, nid);
121 if (!base)
122 base = vmalloc_node(table_size, nid);
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800123 } else {
124 /*
125 * We don't have to allocate page_cgroup again, but
126 * address of memmap may be changed. So, we have to initialize
127 * again.
128 */
129 base = section->page_cgroup + pfn;
130 table_size = 0;
131 /* check address of memmap is changed or not. */
132 if (base->page == pfn_to_page(pfn))
133 return 0;
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700134 }
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700135
136 if (!base) {
137 printk(KERN_ERR "page cgroup allocation failure\n");
138 return -ENOMEM;
139 }
140
141 for (index = 0; index < PAGES_PER_SECTION; index++) {
142 pc = base + index;
143 __init_page_cgroup(pc, pfn + index);
144 }
145
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700146 section->page_cgroup = base - pfn;
147 total_usage += table_size;
148 return 0;
149}
150#ifdef CONFIG_MEMORY_HOTPLUG
151void __free_page_cgroup(unsigned long pfn)
152{
153 struct mem_section *ms;
154 struct page_cgroup *base;
155
156 ms = __pfn_to_section(pfn);
157 if (!ms || !ms->page_cgroup)
158 return;
159 base = ms->page_cgroup + pfn;
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700160 if (is_vmalloc_addr(base)) {
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700161 vfree(base);
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700162 ms->page_cgroup = NULL;
163 } else {
164 struct page *page = virt_to_page(base);
165 if (!PageReserved(page)) { /* Is bootmem ? */
166 kfree(base);
167 ms->page_cgroup = NULL;
168 }
169 }
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700170}
171
Al Viro31168482008-11-22 17:33:24 +0000172int __meminit online_page_cgroup(unsigned long start_pfn,
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700173 unsigned long nr_pages,
174 int nid)
175{
176 unsigned long start, end, pfn;
177 int fail = 0;
178
KAMEZAWA Hiroyuki33c5d3d2008-11-12 13:27:01 -0800179 start = start_pfn & ~(PAGES_PER_SECTION - 1);
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700180 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
181
182 for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
183 if (!pfn_present(pfn))
184 continue;
185 fail = init_section_page_cgroup(pfn);
186 }
187 if (!fail)
188 return 0;
189
190 /* rollback */
191 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
192 __free_page_cgroup(pfn);
193
194 return -ENOMEM;
195}
196
Al Viro31168482008-11-22 17:33:24 +0000197int __meminit offline_page_cgroup(unsigned long start_pfn,
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700198 unsigned long nr_pages, int nid)
199{
200 unsigned long start, end, pfn;
201
KAMEZAWA Hiroyuki33c5d3d2008-11-12 13:27:01 -0800202 start = start_pfn & ~(PAGES_PER_SECTION - 1);
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700203 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
204
205 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
206 __free_page_cgroup(pfn);
207 return 0;
208
209}
210
Al Viro31168482008-11-22 17:33:24 +0000211static int __meminit page_cgroup_callback(struct notifier_block *self,
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700212 unsigned long action, void *arg)
213{
214 struct memory_notify *mn = arg;
215 int ret = 0;
216 switch (action) {
217 case MEM_GOING_ONLINE:
218 ret = online_page_cgroup(mn->start_pfn,
219 mn->nr_pages, mn->status_change_nid);
220 break;
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700221 case MEM_OFFLINE:
222 offline_page_cgroup(mn->start_pfn,
223 mn->nr_pages, mn->status_change_nid);
224 break;
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800225 case MEM_CANCEL_ONLINE:
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700226 case MEM_GOING_OFFLINE:
227 break;
228 case MEM_ONLINE:
229 case MEM_CANCEL_OFFLINE:
230 break;
231 }
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800232
233 if (ret)
234 ret = notifier_from_errno(ret);
235 else
236 ret = NOTIFY_OK;
237
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700238 return ret;
239}
240
241#endif
242
243void __init page_cgroup_init(void)
244{
245 unsigned long pfn;
246 int fail = 0;
247
Hirokazu Takahashif8d665422009-01-07 18:08:02 -0800248 if (mem_cgroup_disabled())
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700249 return;
250
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700251 for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
252 if (!pfn_present(pfn))
253 continue;
254 fail = init_section_page_cgroup(pfn);
255 }
256 if (fail) {
Randy Dunlap8ca739e2009-06-17 16:26:32 -0700257 printk(KERN_CRIT "try 'cgroup_disable=memory' boot option\n");
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700258 panic("Out of memory");
259 } else {
260 hotplug_memory_notifier(page_cgroup_callback, 0);
261 }
262 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
Randy Dunlap8ca739e2009-06-17 16:26:32 -0700263 printk(KERN_INFO "please try 'cgroup_disable=memory' option if you don't"
264 " want memory cgroups\n");
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700265}
266
Al Viro31168482008-11-22 17:33:24 +0000267void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700268{
269 return;
270}
271
272#endif
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800273
274
275#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
276
277static DEFINE_MUTEX(swap_cgroup_mutex);
278struct swap_cgroup_ctrl {
279 struct page **map;
280 unsigned long length;
281};
282
283struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES];
284
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800285struct swap_cgroup {
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700286 unsigned short id;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800287};
288#define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup))
289#define SC_POS_MASK (SC_PER_PAGE - 1)
290
291/*
292 * SwapCgroup implements "lookup" and "exchange" operations.
293 * In typical usage, this swap_cgroup is accessed via memcg's charge/uncharge
294 * against SwapCache. At swap_free(), this is accessed directly from swap.
295 *
296 * This means,
297 * - we have no race in "exchange" when we're accessed via SwapCache because
298 * SwapCache(and its swp_entry) is under lock.
299 * - When called via swap_free(), there is no user of this entry and no race.
300 * Then, we don't need lock around "exchange".
301 *
302 * TODO: we can push these buffers out to HIGHMEM.
303 */
304
305/*
306 * allocate buffer for swap_cgroup.
307 */
308static int swap_cgroup_prepare(int type)
309{
310 struct page *page;
311 struct swap_cgroup_ctrl *ctrl;
312 unsigned long idx, max;
313
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800314 ctrl = &swap_cgroup_ctrl[type];
315
316 for (idx = 0; idx < ctrl->length; idx++) {
317 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
318 if (!page)
319 goto not_enough_page;
320 ctrl->map[idx] = page;
321 }
322 return 0;
323not_enough_page:
324 max = idx;
325 for (idx = 0; idx < max; idx++)
326 __free_page(ctrl->map[idx]);
327
328 return -ENOMEM;
329}
330
331/**
332 * swap_cgroup_record - record mem_cgroup for this swp_entry.
333 * @ent: swap entry to be recorded into
334 * @mem: mem_cgroup to be recorded
335 *
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700336 * Returns old value at success, 0 at failure.
337 * (Of course, old value can be 0.)
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800338 */
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700339unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800340{
341 int type = swp_type(ent);
342 unsigned long offset = swp_offset(ent);
343 unsigned long idx = offset / SC_PER_PAGE;
344 unsigned long pos = offset & SC_POS_MASK;
345 struct swap_cgroup_ctrl *ctrl;
346 struct page *mappage;
347 struct swap_cgroup *sc;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700348 unsigned short old;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800349
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800350 ctrl = &swap_cgroup_ctrl[type];
351
352 mappage = ctrl->map[idx];
353 sc = page_address(mappage);
354 sc += pos;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700355 old = sc->id;
356 sc->id = id;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800357
358 return old;
359}
360
361/**
362 * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry
363 * @ent: swap entry to be looked up.
364 *
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700365 * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800366 */
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700367unsigned short lookup_swap_cgroup(swp_entry_t ent)
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800368{
369 int type = swp_type(ent);
370 unsigned long offset = swp_offset(ent);
371 unsigned long idx = offset / SC_PER_PAGE;
372 unsigned long pos = offset & SC_POS_MASK;
373 struct swap_cgroup_ctrl *ctrl;
374 struct page *mappage;
375 struct swap_cgroup *sc;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700376 unsigned short ret;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800377
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800378 ctrl = &swap_cgroup_ctrl[type];
379 mappage = ctrl->map[idx];
380 sc = page_address(mappage);
381 sc += pos;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700382 ret = sc->id;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800383 return ret;
384}
385
386int swap_cgroup_swapon(int type, unsigned long max_pages)
387{
388 void *array;
389 unsigned long array_size;
390 unsigned long length;
391 struct swap_cgroup_ctrl *ctrl;
392
393 if (!do_swap_account)
394 return 0;
395
396 length = ((max_pages/SC_PER_PAGE) + 1);
397 array_size = length * sizeof(void *);
398
399 array = vmalloc(array_size);
400 if (!array)
401 goto nomem;
402
403 memset(array, 0, array_size);
404 ctrl = &swap_cgroup_ctrl[type];
405 mutex_lock(&swap_cgroup_mutex);
406 ctrl->length = length;
407 ctrl->map = array;
408 if (swap_cgroup_prepare(type)) {
409 /* memory shortage */
410 ctrl->map = NULL;
411 ctrl->length = 0;
412 vfree(array);
413 mutex_unlock(&swap_cgroup_mutex);
414 goto nomem;
415 }
416 mutex_unlock(&swap_cgroup_mutex);
417
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800418 return 0;
419nomem:
420 printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n");
421 printk(KERN_INFO
422 "swap_cgroup can be disabled by noswapaccount boot option\n");
423 return -ENOMEM;
424}
425
426void swap_cgroup_swapoff(int type)
427{
428 int i;
429 struct swap_cgroup_ctrl *ctrl;
430
431 if (!do_swap_account)
432 return;
433
434 mutex_lock(&swap_cgroup_mutex);
435 ctrl = &swap_cgroup_ctrl[type];
436 if (ctrl->map) {
437 for (i = 0; i < ctrl->length; i++) {
438 struct page *page = ctrl->map[i];
439 if (page)
440 __free_page(page);
441 }
442 vfree(ctrl->map);
443 ctrl->map = NULL;
444 ctrl->length = 0;
445 }
446 mutex_unlock(&swap_cgroup_mutex);
447}
448
449#endif