vmscan: count the number of times zone_reclaim() scans and fails

[safe/jmp/linux-2.6] / mm / page_cgroup.c

diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index ceecfbb..11a8a10 100644 (file)
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -69,7 +69,7 @@ static int __init alloc_node_page_cgroup(int nid)
        return 0;
 }
 
-void __init page_cgroup_init(void)
+void __init page_cgroup_init_flatmem(void)
 {
 
        int nid, fail;
@@ -113,16 +113,11 @@ static int __init_refok init_section_page_cgroup(unsigned long pfn)
        if (!section->page_cgroup) {
                nid = page_to_nid(pfn_to_page(pfn));
                table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION;
-               if (slab_is_available()) {
-                       base = kmalloc_node(table_size,
-                                       GFP_KERNEL | __GFP_NOWARN, nid);
-                       if (!base)
-                               base = vmalloc_node(table_size, nid);
-               } else {
-                       base = __alloc_bootmem_node_nopanic(NODE_DATA(nid),
-                               table_size,
-                               PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
-               }
+               VM_BUG_ON(!slab_is_available());
+               base = kmalloc_node(table_size,
+                               GFP_KERNEL | __GFP_NOWARN, nid);
+               if (!base)
+                       base = vmalloc_node(table_size, nid);
        } else {
                /*
                 * We don't have to allocate page_cgroup again, but
@@ -285,12 +280,8 @@ struct swap_cgroup_ctrl {
 
 struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES];
 
-/*
- * This 8bytes seems big..maybe we can reduce this when we can use "id" for
- * cgroup rather than pointer.
- */
 struct swap_cgroup {
-       struct mem_cgroup       *val;
+       unsigned short          id;
 };
 #define SC_PER_PAGE    (PAGE_SIZE/sizeof(struct swap_cgroup))
 #define SC_POS_MASK    (SC_PER_PAGE - 1)
@@ -342,10 +333,10 @@ not_enough_page:
  * @ent: swap entry to be recorded into
  * @mem: mem_cgroup to be recorded
  *
- * Returns old value at success, NULL at failure.
- * (Of course, old value can be NULL.)
+ * Returns old value at success, 0 at failure.
+ * (Of course, old value can be 0.)
  */
-struct mem_cgroup *swap_cgroup_record(swp_entry_t ent, struct mem_cgroup *mem)
+unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
 {
        int type = swp_type(ent);
        unsigned long offset = swp_offset(ent);
@@ -354,18 +345,18 @@ struct mem_cgroup *swap_cgroup_record(swp_entry_t ent, struct mem_cgroup *mem)
        struct swap_cgroup_ctrl *ctrl;
        struct page *mappage;
        struct swap_cgroup *sc;
-       struct mem_cgroup *old;
+       unsigned short old;
 
        if (!do_swap_account)
-               return NULL;
+               return 0;
 
        ctrl = &swap_cgroup_ctrl[type];
 
        mappage = ctrl->map[idx];
        sc = page_address(mappage);
        sc += pos;
-       old = sc->val;
-       sc->val = mem;
+       old = sc->id;
+       sc->id = id;
 
        return old;
 }
@@ -374,9 +365,9 @@ struct mem_cgroup *swap_cgroup_record(swp_entry_t ent, struct mem_cgroup *mem)
  * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry
  * @ent: swap entry to be looked up.
  *
- * Returns pointer to mem_cgroup at success. NULL at failure.
+ * Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
  */
-struct mem_cgroup *lookup_swap_cgroup(swp_entry_t ent)
+unsigned short lookup_swap_cgroup(swp_entry_t ent)
 {
        int type = swp_type(ent);
        unsigned long offset = swp_offset(ent);
@@ -385,16 +376,16 @@ struct mem_cgroup *lookup_swap_cgroup(swp_entry_t ent)
        struct swap_cgroup_ctrl *ctrl;
        struct page *mappage;
        struct swap_cgroup *sc;
-       struct mem_cgroup *ret;
+       unsigned short ret;
 
        if (!do_swap_account)
-               return NULL;
+               return 0;
 
        ctrl = &swap_cgroup_ctrl[type];
        mappage = ctrl->map[idx];
        sc = page_address(mappage);
        sc += pos;
-       ret = sc->val;
+       ret = sc->id;
        return ret;
 }
 
@@ -430,13 +421,6 @@ int swap_cgroup_swapon(int type, unsigned long max_pages)
        }
        mutex_unlock(&swap_cgroup_mutex);
 
-       printk(KERN_INFO
-               "swap_cgroup: uses %ld bytes of vmalloc for pointer array space"
-               " and %ld bytes to hold mem_cgroup pointers on swap\n",
-               array_size, length * PAGE_SIZE);
-       printk(KERN_INFO
-       "swap_cgroup can be disabled by noswapaccount boot option.\n");
-
        return 0;
 nomem:
        printk(KERN_INFO "couldn't allocate enough memory for swap_cgroup.\n");