memcg: allocate all page_cgroup at boot

Allocate all page_cgroup at boot and remove page_cgroup poitner from
struct page.  This patch adds an interface as

 struct page_cgroup *lookup_page_cgroup(struct page*)

All FLATMEM/DISCONTIGMEM/SPARSEMEM  and MEMORY_HOTPLUG is supported.

Remove page_cgroup pointer reduces the amount of memory by
 - 4 bytes per PAGE_SIZE.
 - 8 bytes per PAGE_SIZE
if memory controller is disabled. (even if configured.)

On usual 8GB x86-32 server, this saves 8MB of NORMAL_ZONE memory.
On my x86-64 server with 48GB of memory, this saves 96MB of memory.
I think this reduction makes sense.

By pre-allocation, kmalloc/kfree in charge/uncharge are removed.
This means
  - we're not necessary to be afraid of kmalloc faiulre.
    (this can happen because of gfp_mask type.)
  - we can avoid calling kmalloc/kfree.
  - we can avoid allocating tons of small objects which can be fragmented.
  - we can know what amount of memory will be used for this extra-lru handling.

I added printk message as

	"allocated %ld bytes of page_cgroup"
        "please try cgroup_disable=memory option if you don't want"

maybe enough informative for users.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 321 insertions, 178 deletions

diff --git a/mm/Makefile b/mm/Makefile
index da4ccf015aea..c06b45a1ff5f 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -33,5 +33,4 @@ obj-$(CONFIG_FS_XIP) += filemap_xip.o
 obj-$(CONFIG_MIGRATION) += migrate.o
 obj-$(CONFIG_SMP) += allocpercpu.o
 obj-$(CONFIG_QUICKLIST) += quicklist.o
-obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o
-
+obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 031682e7ef0c..d4a92b63e98e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -33,11 +33,11 @@
 #include <linux/seq_file.h>
 #include <linux/vmalloc.h>
 #include <linux/mm_inline.h>
+#include <linux/page_cgroup.h>
 
 #include <asm/uaccess.h>
 
 struct cgroup_subsys mem_cgroup_subsys __read_mostly;
-static struct kmem_cache *page_cgroup_cache __read_mostly;
 #define MEM_CGROUP_RECLAIM_RETRIES      5
 
 /*
@@ -135,79 +135,6 @@ struct mem_cgroup {
 };
 static struct mem_cgroup init_mem_cgroup;
 
-/*
- * We use the lower bit of the page->page_cgroup pointer as a bit spin
- * lock.  We need to ensure that page->page_cgroup is at least two
- * byte aligned (based on comments from Nick Piggin).  But since
- * bit_spin_lock doesn't actually set that lock bit in a non-debug
- * uniprocessor kernel, we should avoid setting it here too.
- */
-#define PAGE_CGROUP_LOCK_BIT    0x0
-#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
-#define PAGE_CGROUP_LOCK        (1 << PAGE_CGROUP_LOCK_BIT)
-#else
-#define PAGE_CGROUP_LOCK        0x0
-#endif
-
-/*
- * A page_cgroup page is associated with every page descriptor. The
- * page_cgroup helps us identify information about the cgroup
- */
-struct page_cgroup {
-        struct list_head lru;           /* per cgroup LRU list */
-        struct page *page;
-        struct mem_cgroup *mem_cgroup;
-        unsigned long flags;
-};
-
-enum {
-        /* flags for mem_cgroup */
-        PCG_CACHE, /* charged as cache */
-        /* flags for LRU placement */
-        PCG_ACTIVE, /* page is active in this cgroup */
-        PCG_FILE, /* page is file system backed */
-        PCG_UNEVICTABLE, /* page is unevictableable */
-};
-
-#define TESTPCGFLAG(uname, lname)                       \
-static inline int PageCgroup##uname(struct page_cgroup *pc)     \
-        { return test_bit(PCG_##lname, &pc->flags); }
-
-#define SETPCGFLAG(uname, lname)                        \
-static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
-        { set_bit(PCG_##lname, &pc->flags);  }
-
-#define CLEARPCGFLAG(uname, lname)                      \
-static inline void ClearPageCgroup##uname(struct page_cgroup *pc)       \
-        { clear_bit(PCG_##lname, &pc->flags);  }
-
-
-/* Cache flag is set only once (at allocation) */
-TESTPCGFLAG(Cache, CACHE)
-
-/* LRU management flags (from global-lru definition) */
-TESTPCGFLAG(File, FILE)
-SETPCGFLAG(File, FILE)
-CLEARPCGFLAG(File, FILE)
-
-TESTPCGFLAG(Active, ACTIVE)
-SETPCGFLAG(Active, ACTIVE)
-CLEARPCGFLAG(Active, ACTIVE)
-
-TESTPCGFLAG(Unevictable, UNEVICTABLE)
-SETPCGFLAG(Unevictable, UNEVICTABLE)
-CLEARPCGFLAG(Unevictable, UNEVICTABLE)
-
-static int page_cgroup_nid(struct page_cgroup *pc)
-{
-        return page_to_nid(pc->page);
-}
-
-static enum zone_type page_cgroup_zid(struct page_cgroup *pc)
-{
-        return page_zonenum(pc->page);
-}
-
 enum charge_type {
         MEM_CGROUP_CHARGE_TYPE_CACHE = 0,
         MEM_CGROUP_CHARGE_TYPE_MAPPED,
@@ -216,12 +143,18 @@ enum charge_type {
         NR_CHARGE_TYPE,
 };
 
+/* only for here (for easy reading.) */
+#define PCGF_CACHE      (1UL << PCG_CACHE)
+#define PCGF_USED       (1UL << PCG_USED)
+#define PCGF_ACTIVE     (1UL << PCG_ACTIVE)
+#define PCGF_LOCK       (1UL << PCG_LOCK)
+#define PCGF_FILE       (1UL << PCG_FILE)
 static const unsigned long
 pcg_default_flags[NR_CHARGE_TYPE] = {
-        ((1 << PCG_CACHE) | (1 << PCG_FILE)),
-        ((1 << PCG_ACTIVE)),
-        ((1 << PCG_ACTIVE) | (1 << PCG_CACHE)),
-        0,
+        PCGF_CACHE | PCGF_FILE | PCGF_USED | PCGF_LOCK, /* File Cache */
+        PCGF_ACTIVE | PCGF_USED | PCGF_LOCK, /* Anon */
+        PCGF_ACTIVE | PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* Shmem */
+        0, /* FORCE */
 };
 
 /*
@@ -303,37 +236,6 @@ struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
                                 struct mem_cgroup, css);
 }
 
-static inline int page_cgroup_locked(struct page *page)
-{
-        return bit_spin_is_locked(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
-}
-
-static void page_assign_page_cgroup(struct page *page, struct page_cgroup *pc)
-{
-        VM_BUG_ON(!page_cgroup_locked(page));
-        page->page_cgroup = ((unsigned long)pc | PAGE_CGROUP_LOCK);
-}
-
-struct page_cgroup *page_get_page_cgroup(struct page *page)
-{
-        return (struct page_cgroup *) (page->page_cgroup & ~PAGE_CGROUP_LOCK);
-}
-
-static void lock_page_cgroup(struct page *page)
-{
-        bit_spin_lock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
-}
-
-static int try_lock_page_cgroup(struct page *page)
-{
-        return bit_spin_trylock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
-}
-
-static void unlock_page_cgroup(struct page *page)
-{
-        bit_spin_unlock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
-}
-
 static void __mem_cgroup_remove_list(struct mem_cgroup_per_zone *mz,
                         struct page_cgroup *pc)
 {
@@ -436,17 +338,16 @@ void mem_cgroup_move_lists(struct page *page, enum lru_list lru)
          * safely get to page_cgroup without it, so just try_lock it:
          * mem_cgroup_isolate_pages allows for page left on wrong list.
          */
-        if (!try_lock_page_cgroup(page))
+        pc = lookup_page_cgroup(page);
+        if (!trylock_page_cgroup(pc))
                 return;
-
-        pc = page_get_page_cgroup(page);
-        if (pc) {
+        if (pc && PageCgroupUsed(pc)) {
                 mz = page_cgroup_zoneinfo(pc);
                 spin_lock_irqsave(&mz->lru_lock, flags);
                 __mem_cgroup_move_lists(pc, lru);
                 spin_unlock_irqrestore(&mz->lru_lock, flags);
         }
-        unlock_page_cgroup(page);
+        unlock_page_cgroup(pc);
 }
 
 /*
@@ -533,6 +434,8 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
         list_for_each_entry_safe_reverse(pc, tmp, src, lru) {
                 if (scan >= nr_to_scan)
                         break;
+                if (unlikely(!PageCgroupUsed(pc)))
+                        continue;
                 page = pc->page;
 
                 if (unlikely(!PageLRU(page)))
@@ -576,26 +479,27 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
 {
         struct mem_cgroup *mem;
         struct page_cgroup *pc;
-        unsigned long flags;
         unsigned long nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
         struct mem_cgroup_per_zone *mz;
+        unsigned long flags;
 
-        pc = kmem_cache_alloc(page_cgroup_cache, gfp_mask);
-        if (unlikely(pc == NULL))
-                goto err;
-
+        pc = lookup_page_cgroup(page);
+        /* can happen at boot */
+        if (unlikely(!pc))
+                return 0;
+        prefetchw(pc);
         /*
          * We always charge the cgroup the mm_struct belongs to.
          * The mm_struct's mem_cgroup changes on task migration if the
          * thread group leader migrates. It's possible that mm is not
          * set, if so charge the init_mm (happens for pagecache usage).
          */
+
         if (likely(!memcg)) {
                 rcu_read_lock();
                 mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
                 if (unlikely(!mem)) {
                         rcu_read_unlock();
-                        kmem_cache_free(page_cgroup_cache, pc);
                         return 0;
                 }
                 /*
@@ -631,36 +535,33 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
                 }
         }
 
+
+        lock_page_cgroup(pc);
+        if (unlikely(PageCgroupUsed(pc))) {
+                unlock_page_cgroup(pc);
+                res_counter_uncharge(&mem->res, PAGE_SIZE);
+                css_put(&mem->css);
+
+                goto done;
+        }
         pc->mem_cgroup = mem;
-        pc->page = page;
         /*
          * If a page is accounted as a page cache, insert to inactive list.
          * If anon, insert to active list.
          */
         pc->flags = pcg_default_flags[ctype];
 
-        lock_page_cgroup(page);
-        if (unlikely(page_get_page_cgroup(page))) {
-                unlock_page_cgroup(page);
-                res_counter_uncharge(&mem->res, PAGE_SIZE);
-                css_put(&mem->css);
-                kmem_cache_free(page_cgroup_cache, pc);
-                goto done;
-        }
-        page_assign_page_cgroup(page, pc);
-
         mz = page_cgroup_zoneinfo(pc);
+
         spin_lock_irqsave(&mz->lru_lock, flags);
         __mem_cgroup_add_list(mz, pc);
         spin_unlock_irqrestore(&mz->lru_lock, flags);
+        unlock_page_cgroup(pc);
 
-        unlock_page_cgroup(page);
 done:
         return 0;
 out:
         css_put(&mem->css);
-        kmem_cache_free(page_cgroup_cache, pc);
-err:
         return -ENOMEM;
 }
 
@@ -668,7 +569,8 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask)
 {
         if (mem_cgroup_subsys.disabled)
                 return 0;
-
+        if (PageCompound(page))
+                return 0;
         /*
          * If already mapped, we don't have to account.
          * If page cache, page->mapping has address_space.
@@ -689,7 +591,8 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
 {
         if (mem_cgroup_subsys.disabled)
                 return 0;
-
+        if (PageCompound(page))
+                return 0;
         /*
          * Corner case handling. This is called from add_to_page_cache()
          * in usual. But some FS (shmem) precharges this page before calling it
@@ -702,15 +605,16 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
         if (!(gfp_mask & __GFP_WAIT)) {
                 struct page_cgroup *pc;
 
-                lock_page_cgroup(page);
-                pc = page_get_page_cgroup(page);
-                if (pc) {
-                        VM_BUG_ON(pc->page != page);
-                        VM_BUG_ON(!pc->mem_cgroup);
-                        unlock_page_cgroup(page);
+
+                pc = lookup_page_cgroup(page);
+                if (!pc)
+                        return 0;
+                lock_page_cgroup(pc);
+                if (PageCgroupUsed(pc)) {
+                        unlock_page_cgroup(pc);
                         return 0;
                 }
-                unlock_page_cgroup(page);
+                unlock_page_cgroup(pc);
         }
 
         if (unlikely(!mm))
@@ -741,37 +645,39 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
         /*
          * Check if our page_cgroup is valid
          */
-        lock_page_cgroup(page);
-        pc = page_get_page_cgroup(page);
-        if (unlikely(!pc))
-                goto unlock;
-
-        VM_BUG_ON(pc->page != page);
+        pc = lookup_page_cgroup(page);
+        if (unlikely(!pc || !PageCgroupUsed(pc)))
+                return;
 
-        if ((ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED)
-            && ((PageCgroupCache(pc) || page_mapped(page))))
-                goto unlock;
+        lock_page_cgroup(pc);
+        if ((ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED && page_mapped(page))
+             || !PageCgroupUsed(pc)) {
+                /* This happens at race in zap_pte_range() and do_swap_page()*/
+                unlock_page_cgroup(pc);
+                return;
+        }
+        ClearPageCgroupUsed(pc);
+        mem = pc->mem_cgroup;
 
         mz = page_cgroup_zoneinfo(pc);
         spin_lock_irqsave(&mz->lru_lock, flags);
         __mem_cgroup_remove_list(mz, pc);
         spin_unlock_irqrestore(&mz->lru_lock, flags);
+        unlock_page_cgroup(pc);
 
-        page_assign_page_cgroup(page, NULL);
-        unlock_page_cgroup(page);
-
-        mem = pc->mem_cgroup;
         res_counter_uncharge(&mem->res, PAGE_SIZE);
         css_put(&mem->css);
 
-        kmem_cache_free(page_cgroup_cache, pc);
         return;
-unlock:
-        unlock_page_cgroup(page);
 }
 
 void mem_cgroup_uncharge_page(struct page *page)
 {
+        /* early check. */
+        if (page_mapped(page))
+                return;
+        if (page->mapping && !PageAnon(page))
+                return;
         __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_MAPPED);
 }
 
@@ -795,9 +701,9 @@ int mem_cgroup_prepare_migration(struct page *page, struct page *newpage)
         if (mem_cgroup_subsys.disabled)
                 return 0;
 
-        lock_page_cgroup(page);
-        pc = page_get_page_cgroup(page);
-        if (pc) {
+        pc = lookup_page_cgroup(page);
+        lock_page_cgroup(pc);
+        if (PageCgroupUsed(pc)) {
                 mem = pc->mem_cgroup;
                 css_get(&mem->css);
                 if (PageCgroupCache(pc)) {
@@ -807,7 +713,7 @@ int mem_cgroup_prepare_migration(struct page *page, struct page *newpage)
                                 ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM;
                 }
         }
-        unlock_page_cgroup(page);
+        unlock_page_cgroup(pc);
         if (mem) {
                 ret = mem_cgroup_charge_common(newpage, NULL, GFP_KERNEL,
                         ctype, mem);
@@ -832,7 +738,7 @@ void mem_cgroup_end_migration(struct page *newpage)
          */
         if (!newpage->mapping)
                 __mem_cgroup_uncharge_common(newpage,
-                                         MEM_CGROUP_CHARGE_TYPE_FORCE);
+                                MEM_CGROUP_CHARGE_TYPE_FORCE);
         else if (PageAnon(newpage))
                 mem_cgroup_uncharge_page(newpage);
 }
@@ -918,6 +824,8 @@ static void mem_cgroup_force_empty_list(struct mem_cgroup *mem,
         while (!list_empty(list)) {
                 pc = list_entry(list->prev, struct page_cgroup, lru);
                 page = pc->page;
+                if (!PageCgroupUsed(pc))
+                        break;
                 get_page(page);
                 spin_unlock_irqrestore(&mz->lru_lock, flags);
                 /*
@@ -932,8 +840,10 @@ static void mem_cgroup_force_empty_list(struct mem_cgroup *mem,
                                 count = FORCE_UNCHARGE_BATCH;
                                 cond_resched();
                         }
-                } else
-                        cond_resched();
+                } else {
+                        spin_lock_irqsave(&mz->lru_lock, flags);
+                        break;
+                }
                 spin_lock_irqsave(&mz->lru_lock, flags);
         }
         spin_unlock_irqrestore(&mz->lru_lock, flags);
@@ -957,6 +867,8 @@ static int mem_cgroup_force_empty(struct mem_cgroup *mem)
         while (mem->res.usage > 0) {
                 if (atomic_read(&mem->css.cgroup->count) > 0)
                         goto out;
+                /* This is for making all *used* pages to be on LRU. */
+                lru_add_drain_all();
                 for_each_node_state(node, N_POSSIBLE)
                         for (zid = 0; zid < MAX_NR_ZONES; zid++) {
                                 struct mem_cgroup_per_zone *mz;
@@ -965,6 +877,7 @@ static int mem_cgroup_force_empty(struct mem_cgroup *mem)
                                 for_each_lru(l)
                                         mem_cgroup_force_empty_list(mem, mz, l);
                         }
+                cond_resched();
         }
         ret = 0;
 out:
@@ -1175,8 +1088,8 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
         int node;
 
         if (unlikely((cont->parent) == NULL)) {
+                page_cgroup_init();
                 mem = &init_mem_cgroup;
-                page_cgroup_cache = KMEM_CACHE(page_cgroup, SLAB_PANIC);
         } else {
                 mem = mem_cgroup_alloc();
                 if (!mem)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f2fc44ec1d44..d0a240fbb8bf 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -44,7 +44,7 @@
 #include <linux/backing-dev.h>
 #include <linux/fault-inject.h>
 #include <linux/page-isolation.h>
-#include <linux/memcontrol.h>
+#include <linux/page_cgroup.h>
 #include <linux/debugobjects.h>
 
 #include <asm/tlbflush.h>
@@ -223,17 +223,12 @@ static inline int bad_range(struct zone *zone, struct page *page)
 
 static void bad_page(struct page *page)
 {
-        void *pc = page_get_page_cgroup(page);
-
         printk(KERN_EMERG "Bad page state in process '%s'\n" KERN_EMERG
                 "page:%p flags:0x%0*lx mapping:%p mapcount:%d count:%d\n",
                 current->comm, page, (int)(2*sizeof(unsigned long)),
                 (unsigned long)page->flags, page->mapping,
                 page_mapcount(page), page_count(page));
-        if (pc) {
-                printk(KERN_EMERG "cgroup:%p\n", pc);
-                page_reset_bad_cgroup(page);
-        }
+
         printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n"
                 KERN_EMERG "Backtrace:\n");
         dump_stack();
@@ -457,7 +452,6 @@ static inline int free_pages_check(struct page *page)
         free_page_mlock(page);
         if (unlikely(page_mapcount(page) |
                 (page->mapping != NULL)  |
-                (page_get_page_cgroup(page) != NULL) |
                 (page_count(page) != 0)  |
                 (page->flags & PAGE_FLAGS_CHECK_AT_FREE)))
                 bad_page(page);
@@ -603,7 +597,6 @@ static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
 {
         if (unlikely(page_mapcount(page) |
                 (page->mapping != NULL)  |
-                (page_get_page_cgroup(page) != NULL) |
                 (page_count(page) != 0)  |
                 (page->flags & PAGE_FLAGS_CHECK_AT_PREP)))
                 bad_page(page);
@@ -3438,6 +3431,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
         pgdat->nr_zones = 0;
         init_waitqueue_head(&pgdat->kswapd_wait);
         pgdat->kswapd_max_order = 0;
+        pgdat_page_cgroup_init(pgdat);
         
         for (j = 0; j < MAX_NR_ZONES; j++) {
                 struct zone *zone = pgdat->node_zones + j;
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
new file mode 100644
index 000000000000..5d86550701f2
--- /dev/null
+++ b/mm/page_cgroup.c
@@ -0,0 +1,237 @@
+#include <linux/mm.h>
+#include <linux/mmzone.h>
+#include <linux/bootmem.h>
+#include <linux/bit_spinlock.h>
+#include <linux/page_cgroup.h>
+#include <linux/hash.h>
+#include <linux/memory.h>
+
+static void __meminit
+__init_page_cgroup(struct page_cgroup *pc, unsigned long pfn)
+{
+        pc->flags = 0;
+        pc->mem_cgroup = NULL;
+        pc->page = pfn_to_page(pfn);
+}
+static unsigned long total_usage;
+
+#if !defined(CONFIG_SPARSEMEM)
+
+
+void __init pgdat_page_cgroup_init(struct pglist_data *pgdat)
+{
+        pgdat->node_page_cgroup = NULL;
+}
+
+struct page_cgroup *lookup_page_cgroup(struct page *page)
+{
+        unsigned long pfn = page_to_pfn(page);
+        unsigned long offset;
+        struct page_cgroup *base;
+
+        base = NODE_DATA(page_to_nid(page))->node_page_cgroup;
+        if (unlikely(!base))
+                return NULL;
+
+        offset = pfn - NODE_DATA(page_to_nid(page))->node_start_pfn;
+        return base + offset;
+}
+
+static int __init alloc_node_page_cgroup(int nid)
+{
+        struct page_cgroup *base, *pc;
+        unsigned long table_size;
+        unsigned long start_pfn, nr_pages, index;
+
+        start_pfn = NODE_DATA(nid)->node_start_pfn;
+        nr_pages = NODE_DATA(nid)->node_spanned_pages;
+
+        table_size = sizeof(struct page_cgroup) * nr_pages;
+
+        base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
+                        table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
+        if (!base)
+                return -ENOMEM;
+        for (index = 0; index < nr_pages; index++) {
+                pc = base + index;
+                __init_page_cgroup(pc, start_pfn + index);
+        }
+        NODE_DATA(nid)->node_page_cgroup = base;
+        total_usage += table_size;
+        return 0;
+}
+
+void __init page_cgroup_init(void)
+{
+
+        int nid, fail;
+
+        for_each_online_node(nid)  {
+                fail = alloc_node_page_cgroup(nid);
+                if (fail)
+                        goto fail;
+        }
+        printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
+        printk(KERN_INFO "please try cgroup_disable=memory option if you"
+        " don't want\n");
+        return;
+fail:
+        printk(KERN_CRIT "allocation of page_cgroup was failed.\n");
+        printk(KERN_CRIT "please try cgroup_disable=memory boot option\n");
+        panic("Out of memory");
+}
+
+#else /* CONFIG_FLAT_NODE_MEM_MAP */
+
+struct page_cgroup *lookup_page_cgroup(struct page *page)
+{
+        unsigned long pfn = page_to_pfn(page);
+        struct mem_section *section = __pfn_to_section(pfn);
+
+        return section->page_cgroup + pfn;
+}
+
+int __meminit init_section_page_cgroup(unsigned long pfn)
+{
+        struct mem_section *section;
+        struct page_cgroup *base, *pc;
+        unsigned long table_size;
+        int nid, index;
+
+        section = __pfn_to_section(pfn);
+
+        if (section->page_cgroup)
+                return 0;
+
+        nid = page_to_nid(pfn_to_page(pfn));
+
+        table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
+        base = kmalloc_node(table_size, GFP_KERNEL, nid);
+        if (!base)
+                base = vmalloc_node(table_size, nid);
+
+        if (!base) {
+                printk(KERN_ERR "page cgroup allocation failure\n");
+                return -ENOMEM;
+        }
+
+        for (index = 0; index < PAGES_PER_SECTION; index++) {
+                pc = base + index;
+                __init_page_cgroup(pc, pfn + index);
+        }
+
+        section = __pfn_to_section(pfn);
+        section->page_cgroup = base - pfn;
+        total_usage += table_size;
+        return 0;
+}
+#ifdef CONFIG_MEMORY_HOTPLUG
+void __free_page_cgroup(unsigned long pfn)
+{
+        struct mem_section *ms;
+        struct page_cgroup *base;
+
+        ms = __pfn_to_section(pfn);
+        if (!ms || !ms->page_cgroup)
+                return;
+        base = ms->page_cgroup + pfn;
+        ms->page_cgroup = NULL;
+        if (is_vmalloc_addr(base))
+                vfree(base);
+        else
+                kfree(base);
+}
+
+int online_page_cgroup(unsigned long start_pfn,
+                        unsigned long nr_pages,
+                        int nid)
+{
+        unsigned long start, end, pfn;
+        int fail = 0;
+
+        start = start_pfn & (PAGES_PER_SECTION - 1);
+        end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
+
+        for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
+                if (!pfn_present(pfn))
+                        continue;
+                fail = init_section_page_cgroup(pfn);
+        }
+        if (!fail)
+                return 0;
+
+        /* rollback */
+        for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
+                __free_page_cgroup(pfn);
+
+        return -ENOMEM;
+}
+
+int offline_page_cgroup(unsigned long start_pfn,
+                unsigned long nr_pages, int nid)
+{
+        unsigned long start, end, pfn;
+
+        start = start_pfn & (PAGES_PER_SECTION - 1);
+        end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
+
+        for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
+                __free_page_cgroup(pfn);
+        return 0;
+
+}
+
+static int page_cgroup_callback(struct notifier_block *self,
+                               unsigned long action, void *arg)
+{
+        struct memory_notify *mn = arg;
+        int ret = 0;
+        switch (action) {
+        case MEM_GOING_ONLINE:
+                ret = online_page_cgroup(mn->start_pfn,
+                                   mn->nr_pages, mn->status_change_nid);
+                break;
+        case MEM_CANCEL_ONLINE:
+        case MEM_OFFLINE:
+                offline_page_cgroup(mn->start_pfn,
+                                mn->nr_pages, mn->status_change_nid);
+                break;
+        case MEM_GOING_OFFLINE:
+                break;
+        case MEM_ONLINE:
+        case MEM_CANCEL_OFFLINE:
+                break;
+        }
+        ret = notifier_from_errno(ret);
+        return ret;
+}
+
+#endif
+
+void __init page_cgroup_init(void)
+{
+        unsigned long pfn;
+        int fail = 0;
+
+        for (pfn = 0; !fail && pfn < max_pfn; pfn += PAGES_PER_SECTION) {
+                if (!pfn_present(pfn))
+                        continue;
+                fail = init_section_page_cgroup(pfn);
+        }
+        if (fail) {
+                printk(KERN_CRIT "try cgroup_disable=memory boot option\n");
+                panic("Out of memory");
+        } else {
+                hotplug_memory_notifier(page_cgroup_callback, 0);
+        }
+        printk(KERN_INFO "allocated %ld bytes of page_cgroup\n", total_usage);
+        printk(KERN_INFO "please try cgroup_disable=memory option if you don't"
+        " want\n");
+}
+
+void __init pgdat_page_cgroup_init(struct pglist_data *pgdat)
+{
+        return;
+}
+
+#endif