blob: f59d797dc5a9b28ddcb3eae0f0aeeb4bc6e6daad [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 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
24void __init pgdat_page_cgroup_init(struct pglist_data *pgdat)
25{
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
52 table_size = sizeof(struct page_cgroup) * nr_pages;
53
54 base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
55 table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
56 if (!base)
57 return -ENOMEM;
58 for (index = 0; index < nr_pages; index++) {
59 pc = base + index;
60 __init_page_cgroup(pc, start_pfn + index);
61 }
62 NODE_DATA(nid)->node_page_cgroup = base;
63 total_usage += table_size;
64 return 0;
65}
66
67void __init page_cgroup_init(void)
68{
69
70 int nid, fail;
71
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -070072 if (mem_cgroup_subsys.disabled)
73 return;
74
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -070075 for_each_online_node(nid) {
76 fail = alloc_node_page_cgroup(nid);
77 if (fail)
78 goto fail;
79 }
80 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
81 printk(KERN_INFO "please try cgroup_disable=memory option if you"
82 " don't want\n");
83 return;
84fail:
85 printk(KERN_CRIT "allocation of page_cgroup was failed.\n");
86 printk(KERN_CRIT "please try cgroup_disable=memory boot option\n");
87 panic("Out of memory");
88}
89
90#else /* CONFIG_FLAT_NODE_MEM_MAP */
91
92struct page_cgroup *lookup_page_cgroup(struct page *page)
93{
94 unsigned long pfn = page_to_pfn(page);
95 struct mem_section *section = __pfn_to_section(pfn);
96
97 return section->page_cgroup + pfn;
98}
99
100int __meminit init_section_page_cgroup(unsigned long pfn)
101{
102 struct mem_section *section;
103 struct page_cgroup *base, *pc;
104 unsigned long table_size;
105 int nid, index;
106
107 section = __pfn_to_section(pfn);
108
109 if (section->page_cgroup)
110 return 0;
111
112 nid = page_to_nid(pfn_to_page(pfn));
113
114 table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700115 if (slab_is_available()) {
116 base = kmalloc_node(table_size, GFP_KERNEL, nid);
117 if (!base)
118 base = vmalloc_node(table_size, nid);
119 } else {
120 base = __alloc_bootmem_node_nopanic(NODE_DATA(nid), table_size,
121 PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
122 }
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700123
124 if (!base) {
125 printk(KERN_ERR "page cgroup allocation failure\n");
126 return -ENOMEM;
127 }
128
129 for (index = 0; index < PAGES_PER_SECTION; index++) {
130 pc = base + index;
131 __init_page_cgroup(pc, pfn + index);
132 }
133
134 section = __pfn_to_section(pfn);
135 section->page_cgroup = base - pfn;
136 total_usage += table_size;
137 return 0;
138}
139#ifdef CONFIG_MEMORY_HOTPLUG
140void __free_page_cgroup(unsigned long pfn)
141{
142 struct mem_section *ms;
143 struct page_cgroup *base;
144
145 ms = __pfn_to_section(pfn);
146 if (!ms || !ms->page_cgroup)
147 return;
148 base = ms->page_cgroup + pfn;
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700149 if (is_vmalloc_addr(base)) {
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700150 vfree(base);
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700151 ms->page_cgroup = NULL;
152 } else {
153 struct page *page = virt_to_page(base);
154 if (!PageReserved(page)) { /* Is bootmem ? */
155 kfree(base);
156 ms->page_cgroup = NULL;
157 }
158 }
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700159}
160
161int online_page_cgroup(unsigned long start_pfn,
162 unsigned long nr_pages,
163 int nid)
164{
165 unsigned long start, end, pfn;
166 int fail = 0;
167
168 start = start_pfn & (PAGES_PER_SECTION - 1);
169 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
170
171 for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
172 if (!pfn_present(pfn))
173 continue;
174 fail = init_section_page_cgroup(pfn);
175 }
176 if (!fail)
177 return 0;
178
179 /* rollback */
180 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
181 __free_page_cgroup(pfn);
182
183 return -ENOMEM;
184}
185
186int offline_page_cgroup(unsigned long start_pfn,
187 unsigned long nr_pages, int nid)
188{
189 unsigned long start, end, pfn;
190
191 start = start_pfn & (PAGES_PER_SECTION - 1);
192 end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
193
194 for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
195 __free_page_cgroup(pfn);
196 return 0;
197
198}
199
200static int page_cgroup_callback(struct notifier_block *self,
201 unsigned long action, void *arg)
202{
203 struct memory_notify *mn = arg;
204 int ret = 0;
205 switch (action) {
206 case MEM_GOING_ONLINE:
207 ret = online_page_cgroup(mn->start_pfn,
208 mn->nr_pages, mn->status_change_nid);
209 break;
210 case MEM_CANCEL_ONLINE:
211 case MEM_OFFLINE:
212 offline_page_cgroup(mn->start_pfn,
213 mn->nr_pages, mn->status_change_nid);
214 break;
215 case MEM_GOING_OFFLINE:
216 break;
217 case MEM_ONLINE:
218 case MEM_CANCEL_OFFLINE:
219 break;
220 }
221 ret = notifier_from_errno(ret);
222 return ret;
223}
224
225#endif
226
227void __init page_cgroup_init(void)
228{
229 unsigned long pfn;
230 int fail = 0;
231
KAMEZAWA Hiroyuki94b6da52008-10-22 14:15:05 -0700232 if (mem_cgroup_subsys.disabled)
233 return;
234
KAMEZAWA Hiroyuki52d4b9a2008-10-18 20:28:16 -0700235 for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
236 if (!pfn_present(pfn))
237 continue;
238 fail = init_section_page_cgroup(pfn);
239 }
240 if (fail) {
241 printk(KERN_CRIT "try cgroup_disable=memory boot option\n");
242 panic("Out of memory");
243 } else {
244 hotplug_memory_notifier(page_cgroup_callback, 0);
245 }
246 printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
247 printk(KERN_INFO "please try cgroup_disable=memory option if you don't"
248 " want\n");
249}
250
251void __init pgdat_page_cgroup_init(struct pglist_data *pgdat)
252{
253 return;
254}
255
256#endif