blob: 11a8a10a3909e973800888da1b600338eb1d8b99 [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 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;
KAMEZAWA Hiroyukica371c02009-06-12 10:33:53 +0300116 VM_BUG_ON(!slab_is_available());
117 base = kmalloc_node(table_size,
118 GFP_KERNEL | __GFP_NOWARN, nid);
119 if (!base)
120 base = vmalloc_node(table_size, nid);
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800121 } else {
122 /*
123 * We don't have to allocate page_cgroup again, but
124 * address of memmap may be changed. So, we have to initialize
125 * again.
126 */
127 base = section->page_cgroup + pfn;
128 table_size = 0;
129 /* check address of memmap is changed or not. */
130 if (base->page == pfn_to_page(pfn))
131 return 0;
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700132 }
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700133
134 if (!base) {
135 printk(KERN_ERR "page cgroup allocation failure\n");
136 return -ENOMEM;
137 }
138
139 for (index = 0; index < PAGES_PER_SECTION; index++) {
140 pc = base + index;
141 __init_page_cgroup(pc, pfn + index);
142 }
143
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700144 section->page_cgroup = base - pfn;
145 total_usage += table_size;
146 return 0;
147}
148#ifdef CONFIG_MEMORY_HOTPLUG
149void __free_page_cgroup(unsigned long pfn)
150{
151 struct mem_section *ms;
152 struct page_cgroup *base;
153
154 ms = __pfn_to_section(pfn);
155 if (!ms || !ms->page_cgroup)
156 return;
157 base = ms->page_cgroup + pfn;
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700158 if (is_vmalloc_addr(base)) {
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700159 vfree(base);
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700160 ms->page_cgroup = NULL;
161 } else {
162 struct page *page = virt_to_page(base);
163 if (!PageReserved(page)) { /* Is bootmem ? */
164 kfree(base);
165 ms->page_cgroup = NULL;
166 }
167 }
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700168}
169
Al Viro31168482008-11-22 17:33:24 +0000170int __meminit online_page_cgroup(unsigned long start_pfn,
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700171 unsigned long nr_pages,
172 int nid)
173{
174 unsigned long start, end, pfn;
175 int fail = 0;
176
KAMEZAWA Hiroyuki33c5d3d2008-11-12 13:27:01 -0800177 start = start_pfn & ~(PAGES_PER_SECTION - 1);
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700178 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
179
180 for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
181 if (!pfn_present(pfn))
182 continue;
183 fail = init_section_page_cgroup(pfn);
184 }
185 if (!fail)
186 return 0;
187
188 /* rollback */
189 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
190 __free_page_cgroup(pfn);
191
192 return -ENOMEM;
193}
194
Al Viro31168482008-11-22 17:33:24 +0000195int __meminit offline_page_cgroup(unsigned long start_pfn,
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700196 unsigned long nr_pages, int nid)
197{
198 unsigned long start, end, pfn;
199
KAMEZAWA Hiroyuki33c5d3d2008-11-12 13:27:01 -0800200 start = start_pfn & ~(PAGES_PER_SECTION - 1);
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700201 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
202
203 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
204 __free_page_cgroup(pfn);
205 return 0;
206
207}
208
Al Viro31168482008-11-22 17:33:24 +0000209static int __meminit page_cgroup_callback(struct notifier_block *self,
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700210 unsigned long action, void *arg)
211{
212 struct memory_notify *mn = arg;
213 int ret = 0;
214 switch (action) {
215 case MEM_GOING_ONLINE:
216 ret = online_page_cgroup(mn->start_pfn,
217 mn->nr_pages, mn->status_change_nid);
218 break;
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700219 case MEM_OFFLINE:
220 offline_page_cgroup(mn->start_pfn,
221 mn->nr_pages, mn->status_change_nid);
222 break;
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800223 case MEM_CANCEL_ONLINE:
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700224 case MEM_GOING_OFFLINE:
225 break;
226 case MEM_ONLINE:
227 case MEM_CANCEL_OFFLINE:
228 break;
229 }
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800230
231 if (ret)
232 ret = notifier_from_errno(ret);
233 else
234 ret = NOTIFY_OK;
235
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700236 return ret;
237}
238
239#endif
240
241void __init page_cgroup_init(void)
242{
243 unsigned long pfn;
244 int fail = 0;
245
Hirokazu Takahashif8d66542009-01-07 18:08:02 -0800246 if (mem_cgroup_disabled())
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700247 return;
248
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700249 for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
250 if (!pfn_present(pfn))
251 continue;
252 fail = init_section_page_cgroup(pfn);
253 }
254 if (fail) {
255 printk(KERN_CRIT "try cgroup_disable=memory boot option\n");
256 panic("Out of memory");
257 } else {
258 hotplug_memory_notifier(page_cgroup_callback, 0);
259 }
260 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
261 printk(KERN_INFO "please try cgroup_disable=memory option if you don't"
262 " want\n");
263}
264
Al Viro31168482008-11-22 17:33:24 +0000265void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700266{
267 return;
268}
269
270#endif
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800271
272
273#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
274
275static DEFINE_MUTEX(swap_cgroup_mutex);
276struct swap_cgroup_ctrl {
277 struct page **map;
278 unsigned long length;
279};
280
281struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES];
282
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800283struct swap_cgroup {
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700284 unsigned short id;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800285};
286#define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup))
287#define SC_POS_MASK (SC_PER_PAGE - 1)
288
289/*
290 * SwapCgroup implements "lookup" and "exchange" operations.
291 * In typical usage, this swap_cgroup is accessed via memcg's charge/uncharge
292 * against SwapCache. At swap_free(), this is accessed directly from swap.
293 *
294 * This means,
295 * - we have no race in "exchange" when we're accessed via SwapCache because
296 * SwapCache(and its swp_entry) is under lock.
297 * - When called via swap_free(), there is no user of this entry and no race.
298 * Then, we don't need lock around "exchange".
299 *
300 * TODO: we can push these buffers out to HIGHMEM.
301 */
302
303/*
304 * allocate buffer for swap_cgroup.
305 */
306static int swap_cgroup_prepare(int type)
307{
308 struct page *page;
309 struct swap_cgroup_ctrl *ctrl;
310 unsigned long idx, max;
311
312 if (!do_swap_account)
313 return 0;
314 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
350 if (!do_swap_account)
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700351 return 0;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800352
353 ctrl = &swap_cgroup_ctrl[type];
354
355 mappage = ctrl->map[idx];
356 sc = page_address(mappage);
357 sc += pos;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700358 old = sc->id;
359 sc->id = id;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800360
361 return old;
362}
363
364/**
365 * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry
366 * @ent: swap entry to be looked up.
367 *
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700368 * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800369 */
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700370unsigned short lookup_swap_cgroup(swp_entry_t ent)
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800371{
372 int type = swp_type(ent);
373 unsigned long offset = swp_offset(ent);
374 unsigned long idx = offset / SC_PER_PAGE;
375 unsigned long pos = offset & SC_POS_MASK;
376 struct swap_cgroup_ctrl *ctrl;
377 struct page *mappage;
378 struct swap_cgroup *sc;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700379 unsigned short ret;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800380
381 if (!do_swap_account)
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700382 return 0;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800383
384 ctrl = &swap_cgroup_ctrl[type];
385 mappage = ctrl->map[idx];
386 sc = page_address(mappage);
387 sc += pos;
KAMEZAWA Hiroyukia3b2d692009-04-02 16:57:45 -0700388 ret = sc->id;
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800389 return ret;
390}
391
392int swap_cgroup_swapon(int type, unsigned long max_pages)
393{
394 void *array;
395 unsigned long array_size;
396 unsigned long length;
397 struct swap_cgroup_ctrl *ctrl;
398
399 if (!do_swap_account)
400 return 0;
401
402 length = ((max_pages/SC_PER_PAGE) + 1);
403 array_size = length * sizeof(void *);
404
405 array = vmalloc(array_size);
406 if (!array)
407 goto nomem;
408
409 memset(array, 0, array_size);
410 ctrl = &swap_cgroup_ctrl[type];
411 mutex_lock(&swap_cgroup_mutex);
412 ctrl->length = length;
413 ctrl->map = array;
414 if (swap_cgroup_prepare(type)) {
415 /* memory shortage */
416 ctrl->map = NULL;
417 ctrl->length = 0;
418 vfree(array);
419 mutex_unlock(&swap_cgroup_mutex);
420 goto nomem;
421 }
422 mutex_unlock(&swap_cgroup_mutex);
423
KAMEZAWA Hiroyuki27a7faa2009-01-07 18:07:58 -0800424 return 0;
425nomem:
426 printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n");
427 printk(KERN_INFO
428 "swap_cgroup can be disabled by noswapaccount boot option\n");
429 return -ENOMEM;
430}
431
432void swap_cgroup_swapoff(int type)
433{
434 int i;
435 struct swap_cgroup_ctrl *ctrl;
436
437 if (!do_swap_account)
438 return;
439
440 mutex_lock(&swap_cgroup_mutex);
441 ctrl = &swap_cgroup_ctrl[type];
442 if (ctrl->map) {
443 for (i = 0; i < ctrl->length; i++) {
444 struct page *page = ctrl->map[i];
445 if (page)
446 __free_page(page);
447 }
448 vfree(ctrl->map);
449 ctrl->map = NULL;
450 ctrl->length = 0;
451 }
452 mutex_unlock(&swap_cgroup_mutex);
453}
454
455#endif