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>
14 static void __meminit init_page_cgroup(struct page_cgroup *pc, unsigned long id)
17 set_page_cgroup_array_id(pc, id);
18 pc->mem_cgroup = NULL;
19 INIT_LIST_HEAD(&pc->lru);
21 static unsigned long total_usage;
23 #if !defined(CONFIG_SPARSEMEM)
26 void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
28 pgdat->node_page_cgroup = NULL;
31 struct page_cgroup *lookup_page_cgroup(struct page *page)
33 unsigned long pfn = page_to_pfn(page);
35 struct page_cgroup *base;
37 base = NODE_DATA(page_to_nid(page))->node_page_cgroup;
41 offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn;
45 struct page *lookup_cgroup_page(struct page_cgroup *pc)
51 pgdat = NODE_DATA(page_cgroup_array_id(pc));
52 pfn = pc - pgdat->node_page_cgroup + pgdat->node_start_pfn;
53 page = pfn_to_page(pfn);
54 VM_BUG_ON(pc != lookup_page_cgroup(page));
58 static int __init alloc_node_page_cgroup(int nid)
60 struct page_cgroup *base, *pc;
61 unsigned long table_size;
62 unsigned long start_pfn, nr_pages, index;
64 start_pfn = NODE_DATA(nid)->node_start_pfn;
65 nr_pages = NODE_DATA(nid)->node_spanned_pages;
70 table_size = sizeof(struct page_cgroup) * nr_pages;
72 base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
73 table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
76 for (index = 0; index < nr_pages; index++) {
78 init_page_cgroup(pc, nid);
80 NODE_DATA(nid)->node_page_cgroup = base;
81 total_usage += table_size;
85 void __init page_cgroup_init_flatmem(void)
90 if (mem_cgroup_disabled())
93 for_each_online_node(nid) {
94 fail = alloc_node_page_cgroup(nid);
98 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
99 printk(KERN_INFO "please try 'cgroup_disable=memory' option if you"
100 " don't want memory cgroups\n");
103 printk(KERN_CRIT "allocation of page_cgroup failed.\n");
104 printk(KERN_CRIT "please try 'cgroup_disable=memory' boot option\n");
105 panic("Out of memory");
108 #else /* CONFIG_FLAT_NODE_MEM_MAP */
110 struct page_cgroup *lookup_page_cgroup(struct page *page)
112 unsigned long pfn = page_to_pfn(page);
113 struct mem_section *section = __pfn_to_section(pfn);
115 if (!section->page_cgroup)
117 return section->page_cgroup + pfn;
120 struct page *lookup_cgroup_page(struct page_cgroup *pc)
122 struct mem_section *section;
126 nr = page_cgroup_array_id(pc);
127 section = __nr_to_section(nr);
128 page = pfn_to_page(pc - section->page_cgroup);
129 VM_BUG_ON(pc != lookup_page_cgroup(page));
133 /* __alloc_bootmem...() is protected by !slab_available() */
134 static int __init_refok init_section_page_cgroup(unsigned long pfn)
136 struct page_cgroup *base, *pc;
137 struct mem_section *section;
138 unsigned long table_size;
142 nr = pfn_to_section_nr(pfn);
143 section = __nr_to_section(nr);
145 if (section->page_cgroup)
148 nid = page_to_nid(pfn_to_page(pfn));
149 table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
150 VM_BUG_ON(!slab_is_available());
151 if (node_state(nid, N_HIGH_MEMORY)) {
152 base = kmalloc_node(table_size,
153 GFP_KERNEL | __GFP_NOWARN, nid);
155 base = vmalloc_node(table_size, nid);
157 base = kmalloc(table_size, GFP_KERNEL | __GFP_NOWARN);
159 base = vmalloc(table_size);
162 * The value stored in section->page_cgroup is (base - pfn)
163 * and it does not point to the memory block allocated above,
164 * causing kmemleak false positives.
166 kmemleak_not_leak(base);
169 printk(KERN_ERR "page cgroup allocation failure\n");
173 for (index = 0; index < PAGES_PER_SECTION; index++) {
175 init_page_cgroup(pc, nr);
178 section->page_cgroup = base - pfn;
179 total_usage += table_size;
182 #ifdef CONFIG_MEMORY_HOTPLUG
183 void __free_page_cgroup(unsigned long pfn)
185 struct mem_section *ms;
186 struct page_cgroup *base;
188 ms = __pfn_to_section(pfn);
189 if (!ms || !ms->page_cgroup)
191 base = ms->page_cgroup + pfn;
192 if (is_vmalloc_addr(base)) {
194 ms->page_cgroup = NULL;
196 struct page *page = virt_to_page(base);
197 if (!PageReserved(page)) { /* Is bootmem ? */
199 ms->page_cgroup = NULL;
204 int __meminit online_page_cgroup(unsigned long start_pfn,
205 unsigned long nr_pages,
208 unsigned long start, end, pfn;
211 start = start_pfn & ~(PAGES_PER_SECTION - 1);
212 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
214 for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
215 if (!pfn_present(pfn))
217 fail = init_section_page_cgroup(pfn);
223 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
224 __free_page_cgroup(pfn);
229 int __meminit offline_page_cgroup(unsigned long start_pfn,
230 unsigned long nr_pages, int nid)
232 unsigned long start, end, pfn;
234 start = start_pfn & ~(PAGES_PER_SECTION - 1);
235 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
237 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
238 __free_page_cgroup(pfn);
243 static int __meminit page_cgroup_callback(struct notifier_block *self,
244 unsigned long action, void *arg)
246 struct memory_notify *mn = arg;
249 case MEM_GOING_ONLINE:
250 ret = online_page_cgroup(mn->start_pfn,
251 mn->nr_pages, mn->status_change_nid);
254 offline_page_cgroup(mn->start_pfn,
255 mn->nr_pages, mn->status_change_nid);
257 case MEM_CANCEL_ONLINE:
258 case MEM_GOING_OFFLINE:
261 case MEM_CANCEL_OFFLINE:
265 return notifier_from_errno(ret);
270 void __init page_cgroup_init(void)
275 if (mem_cgroup_disabled())
278 for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
279 if (!pfn_present(pfn))
281 fail = init_section_page_cgroup(pfn);
284 printk(KERN_CRIT "try 'cgroup_disable=memory' boot option\n");
285 panic("Out of memory");
287 hotplug_memory_notifier(page_cgroup_callback, 0);
289 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
290 printk(KERN_INFO "please try 'cgroup_disable=memory' option if you don't"
291 " want memory cgroups\n");
294 void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
302 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
304 static DEFINE_MUTEX(swap_cgroup_mutex);
305 struct swap_cgroup_ctrl {
307 unsigned long length;
311 struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES];
316 #define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup))
317 #define SC_POS_MASK (SC_PER_PAGE - 1)
320 * SwapCgroup implements "lookup" and "exchange" operations.
321 * In typical usage, this swap_cgroup is accessed via memcg's charge/uncharge
322 * against SwapCache. At swap_free(), this is accessed directly from swap.
325 * - we have no race in "exchange" when we're accessed via SwapCache because
326 * SwapCache(and its swp_entry) is under lock.
327 * - When called via swap_free(), there is no user of this entry and no race.
328 * Then, we don't need lock around "exchange".
330 * TODO: we can push these buffers out to HIGHMEM.
334 * allocate buffer for swap_cgroup.
336 static int swap_cgroup_prepare(int type)
339 struct swap_cgroup_ctrl *ctrl;
340 unsigned long idx, max;
342 ctrl = &swap_cgroup_ctrl[type];
344 for (idx = 0; idx < ctrl->length; idx++) {
345 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
347 goto not_enough_page;
348 ctrl->map[idx] = page;
353 for (idx = 0; idx < max; idx++)
354 __free_page(ctrl->map[idx]);
360 * swap_cgroup_cmpxchg - cmpxchg mem_cgroup's id for this swp_entry.
361 * @end: swap entry to be cmpxchged
365 * Returns old id at success, 0 at failure.
366 * (There is no mem_cgroup useing 0 as its id)
368 unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
369 unsigned short old, unsigned short new)
371 int type = swp_type(ent);
372 unsigned long offset = swp_offset(ent);
373 unsigned long idx = offset / SC_PER_PAGE;
374 unsigned long pos = offset & SC_POS_MASK;
375 struct swap_cgroup_ctrl *ctrl;
376 struct page *mappage;
377 struct swap_cgroup *sc;
379 unsigned short retval;
381 ctrl = &swap_cgroup_ctrl[type];
383 mappage = ctrl->map[idx];
384 sc = page_address(mappage);
386 spin_lock_irqsave(&ctrl->lock, flags);
392 spin_unlock_irqrestore(&ctrl->lock, flags);
397 * swap_cgroup_record - record mem_cgroup for this swp_entry.
398 * @ent: swap entry to be recorded into
399 * @mem: mem_cgroup to be recorded
401 * Returns old value at success, 0 at failure.
402 * (Of course, old value can be 0.)
404 unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
406 int type = swp_type(ent);
407 unsigned long offset = swp_offset(ent);
408 unsigned long idx = offset / SC_PER_PAGE;
409 unsigned long pos = offset & SC_POS_MASK;
410 struct swap_cgroup_ctrl *ctrl;
411 struct page *mappage;
412 struct swap_cgroup *sc;
416 ctrl = &swap_cgroup_ctrl[type];
418 mappage = ctrl->map[idx];
419 sc = page_address(mappage);
421 spin_lock_irqsave(&ctrl->lock, flags);
424 spin_unlock_irqrestore(&ctrl->lock, flags);
430 * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry
431 * @ent: swap entry to be looked up.
433 * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
435 unsigned short lookup_swap_cgroup(swp_entry_t ent)
437 int type = swp_type(ent);
438 unsigned long offset = swp_offset(ent);
439 unsigned long idx = offset / SC_PER_PAGE;
440 unsigned long pos = offset & SC_POS_MASK;
441 struct swap_cgroup_ctrl *ctrl;
442 struct page *mappage;
443 struct swap_cgroup *sc;
446 ctrl = &swap_cgroup_ctrl[type];
447 mappage = ctrl->map[idx];
448 sc = page_address(mappage);
454 int swap_cgroup_swapon(int type, unsigned long max_pages)
457 unsigned long array_size;
458 unsigned long length;
459 struct swap_cgroup_ctrl *ctrl;
461 if (!do_swap_account)
464 length = ((max_pages/SC_PER_PAGE) + 1);
465 array_size = length * sizeof(void *);
467 array = vmalloc(array_size);
471 memset(array, 0, array_size);
472 ctrl = &swap_cgroup_ctrl[type];
473 mutex_lock(&swap_cgroup_mutex);
474 ctrl->length = length;
476 spin_lock_init(&ctrl->lock);
477 if (swap_cgroup_prepare(type)) {
478 /* memory shortage */
482 mutex_unlock(&swap_cgroup_mutex);
485 mutex_unlock(&swap_cgroup_mutex);
489 printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n");
491 "swap_cgroup can be disabled by noswapaccount boot option\n");
495 void swap_cgroup_swapoff(int type)
498 struct swap_cgroup_ctrl *ctrl;
500 if (!do_swap_account)
503 mutex_lock(&swap_cgroup_mutex);
504 ctrl = &swap_cgroup_ctrl[type];
506 for (i = 0; i < ctrl->length; i++) {
507 struct page *page = ctrl->map[i];
515 mutex_unlock(&swap_cgroup_mutex);