mm/page_cgroup.c

   1 #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>
   7 #include <linux/slab.h>
   8 #include <linux/memory.h>
   9 #include <linux/vmalloc.h>
  10 #include <linux/cgroup.h>
  11
  12 static 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 }
  19 static unsigned long total_usage;
  20
  21 #if !defined(CONFIG_SPARSEMEM)
  22
  23
  24 void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
  25 {
  26         pgdat->node_page_cgroup = NULL;
  27 }
  28
  29 struct 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
  43 static 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
  67 void __init page_cgroup_init(void)
  68 {
  69
  70         int nid, fail;
  71
  72         if (mem_cgroup_subsys.disabled)
  73                 return;
  74
  75         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;
  84 fail:
  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
  92 struct 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
 100 /* __alloc_bootmem...() is protected by !slab_available() */
 101 int __init_refok init_section_page_cgroup(unsigned long pfn)
 102 {
 103         struct mem_section *section;
 104         struct page_cgroup *base, *pc;
 105         unsigned long table_size;
 106         int nid, index;
 107
 108         section = __pfn_to_section(pfn);
 109
 110         if (!section->page_cgroup) {
 111                 nid = page_to_nid(pfn_to_page(pfn));
 112                 table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
 113                 if (slab_is_available()) {
 114                         base = kmalloc_node(table_size, GFP_KERNEL, nid);
 115                         if (!base)
 116                                 base = vmalloc_node(table_size, nid);
 117                 } else {
 118                         base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
 119                                 table_size,
 120                                 PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
 121                 }
 122         } else {
 123                 /*
 124                  * We don't have to allocate page_cgroup again, but
 125                  * address of memmap may be changed. So, we have to initialize
 126                  * again.
 127                  */
 128                 base = section->page_cgroup + pfn;
 129                 table_size = 0;
 130                 /* check address of memmap is changed or not. */
 131                 if (base->page == pfn_to_page(pfn))
 132                         return 0;
 133         }
 134
 135         if (!base) {
 136                 printk(KERN_ERR "page cgroup allocation failure\n");
 137                 return -ENOMEM;
 138         }
 139
 140         for (index = 0; index < PAGES_PER_SECTION; index++) {
 141                 pc = base + index;
 142                 __init_page_cgroup(pc, pfn + index);
 143         }
 144
 145         section = __pfn_to_section(pfn);
 146         section->page_cgroup = base - pfn;
 147         total_usage += table_size;
 148         return 0;
 149 }
 150 #ifdef CONFIG_MEMORY_HOTPLUG
 151 void __free_page_cgroup(unsigned long pfn)
 152 {
 153         struct mem_section *ms;
 154         struct page_cgroup *base;
 155
 156         ms = __pfn_to_section(pfn);
 157         if (!ms || !ms->page_cgroup)
 158                 return;
 159         base = ms->page_cgroup + pfn;
 160         if (is_vmalloc_addr(base)) {
 161                 vfree(base);
 162                 ms->page_cgroup = NULL;
 163         } else {
 164                 struct page *page = virt_to_page(base);
 165                 if (!PageReserved(page)) { /* Is bootmem ? */
 166                         kfree(base);
 167                         ms->page_cgroup = NULL;
 168                 }
 169         }
 170 }
 171
 172 int __meminit online_page_cgroup(unsigned long start_pfn,
 173                         unsigned long nr_pages,
 174                         int nid)
 175 {
 176         unsigned long start, end, pfn;
 177         int fail = 0;
 178
 179         start = start_pfn & ~(PAGES_PER_SECTION - 1);
 180         end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
 181
 182         for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
 183                 if (!pfn_present(pfn))
 184                         continue;
 185                 fail = init_section_page_cgroup(pfn);
 186         }
 187         if (!fail)
 188                 return 0;
 189
 190         /* rollback */
 191         for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
 192                 __free_page_cgroup(pfn);
 193
 194         return -ENOMEM;
 195 }
 196
 197 int __meminit offline_page_cgroup(unsigned long start_pfn,
 198                 unsigned long nr_pages, int nid)
 199 {
 200         unsigned long start, end, pfn;
 201
 202         start = start_pfn & ~(PAGES_PER_SECTION - 1);
 203         end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
 204
 205         for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
 206                 __free_page_cgroup(pfn);
 207         return 0;
 208
 209 }
 210
 211 static int __meminit page_cgroup_callback(struct notifier_block *self,
 212                                unsigned long action, void *arg)
 213 {
 214         struct memory_notify *mn = arg;
 215         int ret = 0;
 216         switch (action) {
 217         case MEM_GOING_ONLINE:
 218                 ret = online_page_cgroup(mn->start_pfn,
 219                                    mn->nr_pages, mn->status_change_nid);
 220                 break;
 221         case MEM_OFFLINE:
 222                 offline_page_cgroup(mn->start_pfn,
 223                                 mn->nr_pages, mn->status_change_nid);
 224                 break;
 225         case MEM_CANCEL_ONLINE:
 226         case MEM_GOING_OFFLINE:
 227                 break;
 228         case MEM_ONLINE:
 229         case MEM_CANCEL_OFFLINE:
 230                 break;
 231         }
 232
 233         if (ret)
 234                 ret = notifier_from_errno(ret);
 235         else
 236                 ret = NOTIFY_OK;
 237
 238         return ret;
 239 }
 240
 241 #endif
 242
 243 void __init page_cgroup_init(void)
 244 {
 245         unsigned long pfn;
 246         int fail = 0;
 247
 248         if (mem_cgroup_subsys.disabled)
 249                 return;
 250
 251         for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
 252                 if (!pfn_present(pfn))
 253                         continue;
 254                 fail = init_section_page_cgroup(pfn);
 255         }
 256         if (fail) {
 257                 printk(KERN_CRIT "try cgroup_disable=memory boot option\n");
 258                 panic("Out of memory");
 259         } else {
 260                 hotplug_memory_notifier(page_cgroup_callback, 0);
 261         }
 262         printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
 263         printk(KERN_INFO "please try cgroup_disable=memory option if you don't"
 264         " want\n");
 265 }
 266
 267 void __meminit pgdat_page_cgroup_init(struct pglist_data *pgdat)
 268 {
 269         return;
 270 }
 271
 272 #endif