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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 Hiroyuki52d4b9a2008-10-18 20:28:16 -070011
12static void __meminit
13__init_page_cgroup(struct page_cgroup *pc, unsigned long pfn)
14{
15 pc->flags = 0;
16 pc->mem_cgroup = NULL;
17 pc->page = pfn_to_page(pfn);
18}
19static unsigned long total_usage;
20
21#if !defined(CONFIG_SPARSEMEM)
22
23
Al Viro31168482008-11-22 17:33:24 +000024void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070025{
26 pgdat->node_page_cgroup = NULL;
27}
28
29struct page_cgroup *lookup_page_cgroup(struct page *page)
30{
31 unsigned long pfn = page_to_pfn(page);
32 unsigned long offset;
33 struct page_cgroup *base;
34
35 base = NODE_DATA(page_to_nid(page))->node_page_cgroup;
36 if (unlikely(!base))
37 return NULL;
38
39 offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn;
40 return base + offset;
41}
42
43static int __init alloc_node_page_cgroup(int nid)
44{
45 struct page_cgroup *base, *pc;
46 unsigned long table_size;
47 unsigned long start_pfn, nr_pages, index;
48
49 start_pfn = NODE_DATA(nid)->node_start_pfn;
50 nr_pages = NODE_DATA(nid)->node_spanned_pages;
51
KAMEZAWA Hiroyuki653d22c2008-12-09 13:14:20 -080052 if (!nr_pages)
53 return 0;
54
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070055 table_size = sizeof(struct page_cgroup) * nr_pages;
56
57 base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
58 table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
59 if (!base)
60 return -ENOMEM;
61 for (index = 0; index < nr_pages; index++) {
62 pc = base + index;
63 __init_page_cgroup(pc, start_pfn + index);
64 }
65 NODE_DATA(nid)->node_page_cgroup = base;
66 total_usage += table_size;
67 return 0;
68}
69
70void __init page_cgroup_init(void)
71{
72
73 int nid, fail;
74
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -070075 if (mem_cgroup_subsys.disabled)
76 return;
77
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070078 for_each_online_node(nid) {
79 fail = alloc_node_page_cgroup(nid);
80 if (fail)
81 goto fail;
82 }
83 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
84 printk(KERN_INFO "please try cgroup_disable=memory option if you"
85 " don't want\n");
86 return;
87fail:
88 printk(KERN_CRIT "allocation of page_cgroup was failed.\n");
89 printk(KERN_CRIT "please try cgroup_disable=memory boot option\n");
90 panic("Out of memory");
91}
92
93#else /* CONFIG_FLAT_NODE_MEM_MAP */
94
95struct page_cgroup *lookup_page_cgroup(struct page *page)
96{
97 unsigned long pfn = page_to_pfn(page);
98 struct mem_section *section = __pfn_to_section(pfn);
99
100 return section->page_cgroup + pfn;
101}
102
Al Viro31168482008-11-22 17:33:24 +0000103/* __alloc_bootmem...() is protected by !slab_available() */
104int __init_refok init_section_page_cgroup(unsigned long pfn)
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700105{
106 struct mem_section *section;
107 struct page_cgroup *base, *pc;
108 unsigned long table_size;
109 int nid, index;
110
111 section = __pfn_to_section(pfn);
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()) {
117 base = kmalloc_node(table_size, GFP_KERNEL, nid);
118 if (!base)
119 base = vmalloc_node(table_size, nid);
120 } else {
121 base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
122 table_size,
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700123 PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
KAMEZAWA Hiroyukidc19f9d2008-12-01 13:13:48 -0800124 }
125 } else {
126 /*
127 * We don't have to allocate page_cgroup again, but
128 * address of memmap may be changed. So, we have to initialize
129 * again.
130 */
131 base = section->page_cgroup + pfn;
132 table_size = 0;
133 /* check address of memmap is changed or not. */
134 if (base->page == pfn_to_page(pfn))
135 return 0;
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700136 }
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700137
138 if (!base) {
139 printk(KERN_ERR "page cgroup allocation failure\n");
140 return -ENOMEM;
141 }
142
143 for (index = 0; index < PAGES_PER_SECTION; index++) {
144 pc = base + index;
145 __init_page_cgroup(pc, pfn + index);
146 }
147
148 section = __pfn_to_section(pfn);
149 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
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700251 if (mem_cgroup_subsys.disabled)
252 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