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>
14 __init_page_cgroup(struct page_cgroup *pc, unsigned long pfn)
17 pc->mem_cgroup = NULL;
18 pc->page = pfn_to_page(pfn);
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 static int __init alloc_node_page_cgroup(int nid)
47 struct page_cgroup *base, *pc;
48 unsigned long table_size;
49 unsigned long start_pfn, nr_pages, index;
53 start_pfn = NODE_DATA(nid)->node_start_pfn;
54 nr_pages = NODE_DATA(nid)->node_spanned_pages;
59 table_size = sizeof(struct page_cgroup) * nr_pages;
60 order = get_order(table_size);
61 page = alloc_pages_node(nid, GFP_NOWAIT | __GFP_ZERO, order);
63 page = alloc_pages_node(-1, GFP_NOWAIT | __GFP_ZERO, order);
66 base = page_address(page);
67 for (index = 0; index < nr_pages; index++) {
69 __init_page_cgroup(pc, start_pfn + index);
71 NODE_DATA(nid)->node_page_cgroup = base;
72 total_usage += table_size;
76 void __init page_cgroup_init(void)
81 if (mem_cgroup_disabled())
84 for_each_online_node(nid) {
85 fail = alloc_node_page_cgroup(nid);
89 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
90 printk(KERN_INFO "please try cgroup_disable=memory option if you"
94 printk(KERN_CRIT "allocation of page_cgroup was failed.\n");
95 printk(KERN_CRIT "please try cgroup_disable=memory boot option\n");
96 panic("Out of memory");
99 #else /* CONFIG_FLAT_NODE_MEM_MAP */
101 struct page_cgroup *lookup_page_cgroup(struct page *page)
103 unsigned long pfn = page_to_pfn(page);
104 struct mem_section *section = __pfn_to_section(pfn);
106 return section->page_cgroup + pfn;
109 /* __alloc_bootmem...() is protected by !slab_available() */
110 static int __init_refok init_section_page_cgroup(unsigned long pfn)
112 struct mem_section *section = __pfn_to_section(pfn);
113 struct page_cgroup *base, *pc;
114 unsigned long table_size;
117 if (!section->page_cgroup) {
118 nid = page_to_nid(pfn_to_page(pfn));
119 table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
120 if (slab_is_available()) {
121 base = kmalloc_node(table_size,
122 GFP_KERNEL | __GFP_NOWARN, nid);
124 base = vmalloc_node(table_size, nid);
126 base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
128 PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
132 * We don't have to allocate page_cgroup again, but
133 * address of memmap may be changed. So, we have to initialize
136 base = section->page_cgroup + pfn;
138 /* check address of memmap is changed or not. */
139 if (base->page == pfn_to_page(pfn))
144 printk(KERN_ERR "page cgroup allocation failure\n");
148 for (index = 0; index < PAGES_PER_SECTION; index++) {
150 __init_page_cgroup(pc, pfn + index);
153 section->page_cgroup = base - pfn;
154 total_usage += table_size;
157 #ifdef CONFIG_MEMORY_HOTPLUG
158 void __free_page_cgroup(unsigned long pfn)
160 struct mem_section *ms;
161 struct page_cgroup *base;
163 ms = __pfn_to_section(pfn);
164 if (!ms || !ms->page_cgroup)
166 base = ms->page_cgroup + pfn;
167 if (is_vmalloc_addr(base)) {
169 ms->page_cgroup = NULL;
171 struct page *page = virt_to_page(base);
172 if (!PageReserved(page)) { /* Is bootmem ? */
174 ms->page_cgroup = NULL;
179 int __meminit online_page_cgroup(unsigned long start_pfn,
180 unsigned long nr_pages,
183 unsigned long start, end, pfn;
186 start = start_pfn & ~(PAGES_PER_SECTION - 1);
187 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
189 for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
190 if (!pfn_present(pfn))
192 fail = init_section_page_cgroup(pfn);
198 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
199 __free_page_cgroup(pfn);
204 int __meminit offline_page_cgroup(unsigned long start_pfn,
205 unsigned long nr_pages, int nid)
207 unsigned long start, end, pfn;
209 start = start_pfn & ~(PAGES_PER_SECTION - 1);
210 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
212 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
213 __free_page_cgroup(pfn);
218 static int __meminit page_cgroup_callback(struct notifier_block *self,
219 unsigned long action, void *arg)
221 struct memory_notify *mn = arg;
224 case MEM_GOING_ONLINE:
225 ret = online_page_cgroup(mn->start_pfn,
226 mn->nr_pages, mn->status_change_nid);
229 offline_page_cgroup(mn->start_pfn,
230 mn->nr_pages, mn->status_change_nid);
232 case MEM_CANCEL_ONLINE:
233 case MEM_GOING_OFFLINE:
236 case MEM_CANCEL_OFFLINE:
241 ret = notifier_from_errno(ret);
250 void __init page_cgroup_init(void)
255 if (mem_cgroup_disabled())
258 for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
259 if (!pfn_present(pfn))
261 fail = init_section_page_cgroup(pfn);
264 printk(KERN_CRIT "try cgroup_disable=memory boot option\n");
265 panic("Out of memory");
267 hotplug_memory_notifier(page_cgroup_callback, 0);
269 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
270 printk(KERN_INFO "please try cgroup_disable=memory option if you don't"
274 void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
282 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
284 static DEFINE_MUTEX(swap_cgroup_mutex);
285 struct swap_cgroup_ctrl {
287 unsigned long length;
290 struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES];
295 #define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup))
296 #define SC_POS_MASK (SC_PER_PAGE - 1)
299 * SwapCgroup implements "lookup" and "exchange" operations.
300 * In typical usage, this swap_cgroup is accessed via memcg's charge/uncharge
301 * against SwapCache. At swap_free(), this is accessed directly from swap.
304 * - we have no race in "exchange" when we're accessed via SwapCache because
305 * SwapCache(and its swp_entry) is under lock.
306 * - When called via swap_free(), there is no user of this entry and no race.
307 * Then, we don't need lock around "exchange".
309 * TODO: we can push these buffers out to HIGHMEM.
313 * allocate buffer for swap_cgroup.
315 static int swap_cgroup_prepare(int type)
318 struct swap_cgroup_ctrl *ctrl;
319 unsigned long idx, max;
321 if (!do_swap_account)
323 ctrl = &swap_cgroup_ctrl[type];
325 for (idx = 0; idx < ctrl->length; idx++) {
326 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
328 goto not_enough_page;
329 ctrl->map[idx] = page;
334 for (idx = 0; idx < max; idx++)
335 __free_page(ctrl->map[idx]);
341 * swap_cgroup_record - record mem_cgroup for this swp_entry.
342 * @ent: swap entry to be recorded into
343 * @mem: mem_cgroup to be recorded
345 * Returns old value at success, 0 at failure.
346 * (Of course, old value can be 0.)
348 unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
350 int type = swp_type(ent);
351 unsigned long offset = swp_offset(ent);
352 unsigned long idx = offset / SC_PER_PAGE;
353 unsigned long pos = offset & SC_POS_MASK;
354 struct swap_cgroup_ctrl *ctrl;
355 struct page *mappage;
356 struct swap_cgroup *sc;
359 if (!do_swap_account)
362 ctrl = &swap_cgroup_ctrl[type];
364 mappage = ctrl->map[idx];
365 sc = page_address(mappage);
374 * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry
375 * @ent: swap entry to be looked up.
377 * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
379 unsigned short lookup_swap_cgroup(swp_entry_t ent)
381 int type = swp_type(ent);
382 unsigned long offset = swp_offset(ent);
383 unsigned long idx = offset / SC_PER_PAGE;
384 unsigned long pos = offset & SC_POS_MASK;
385 struct swap_cgroup_ctrl *ctrl;
386 struct page *mappage;
387 struct swap_cgroup *sc;
390 if (!do_swap_account)
393 ctrl = &swap_cgroup_ctrl[type];
394 mappage = ctrl->map[idx];
395 sc = page_address(mappage);
401 int swap_cgroup_swapon(int type, unsigned long max_pages)
404 unsigned long array_size;
405 unsigned long length;
406 struct swap_cgroup_ctrl *ctrl;
408 if (!do_swap_account)
411 length = ((max_pages/SC_PER_PAGE) + 1);
412 array_size = length * sizeof(void *);
414 array = vmalloc(array_size);
418 memset(array, 0, array_size);
419 ctrl = &swap_cgroup_ctrl[type];
420 mutex_lock(&swap_cgroup_mutex);
421 ctrl->length = length;
423 if (swap_cgroup_prepare(type)) {
424 /* memory shortage */
428 mutex_unlock(&swap_cgroup_mutex);
431 mutex_unlock(&swap_cgroup_mutex);
435 printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n");
437 "swap_cgroup can be disabled by noswapaccount boot option\n");
441 void swap_cgroup_swapoff(int type)
444 struct swap_cgroup_ctrl *ctrl;
446 if (!do_swap_account)
449 mutex_lock(&swap_cgroup_mutex);
450 ctrl = &swap_cgroup_ctrl[type];
452 for (i = 0; i < ctrl->length; i++) {
453 struct page *page = ctrl->map[i];
461 mutex_unlock(&swap_cgroup_mutex);