memory unplug: page isolation

[linux-2.6] / include / linux / mmzone.h

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index a8140a9a65e8231df40bb8707ee73b972981921b..f4bfe824834f995dd533c538f377bfaf39331aea 100644 (file)
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -33,24 +33,27 @@
  */
 #define PAGE_ALLOC_COSTLY_ORDER 3
 
-#ifdef CONFIG_PAGE_GROUP_BY_MOBILITY
 #define MIGRATE_UNMOVABLE     0
 #define MIGRATE_RECLAIMABLE   1
 #define MIGRATE_MOVABLE       2
-#define MIGRATE_HIGHATOMIC    3
-#define MIGRATE_TYPES         4
-#else
-#define MIGRATE_UNMOVABLE     0
-#define MIGRATE_UNRECLAIMABLE 0
-#define MIGRATE_MOVABLE       0
-#define MIGRATE_HIGHATOMIC    0
-#define MIGRATE_TYPES         1
-#endif
+#define MIGRATE_RESERVE       3
+#define MIGRATE_ISOLATE       4 /* can't allocate from here */
+#define MIGRATE_TYPES         5
 
 #define for_each_migratetype_order(order, type) \
        for (order = 0; order < MAX_ORDER; order++) \
                for (type = 0; type < MIGRATE_TYPES; type++)
 
+extern int page_group_by_mobility_disabled;
+
+static inline int get_pageblock_migratetype(struct page *page)
+{
+       if (unlikely(page_group_by_mobility_disabled))
+               return MIGRATE_UNMOVABLE;
+
+       return get_pageblock_flags_group(page, PB_migrate, PB_migrate_end);
+}
+
 struct free_area {
        struct list_head        free_list[MIGRATE_TYPES];
        unsigned long           nr_free;
@@ -243,7 +246,7 @@ struct zone {
 
 #ifndef CONFIG_SPARSEMEM
        /*
-        * Flags for a MAX_ORDER_NR_PAGES block. See pageblock-flags.h.
+        * Flags for a pageblock_nr_pages block. See pageblock-flags.h.
         * In SPARSEMEM, this map is stored in struct mem_section
         */
        unsigned long           *pageblock_flags;
@@ -748,7 +751,7 @@ extern struct zone *next_zone(struct zone *zone);
 #define PAGE_SECTION_MASK      (~(PAGES_PER_SECTION-1))
 
 #define SECTION_BLOCKFLAGS_BITS \
-               ((SECTION_SIZE_BITS - (MAX_ORDER-1)) * NR_PAGEBLOCK_BITS)
+       ((1UL << (PFN_SECTION_SHIFT - pageblock_order)) * NR_PAGEBLOCK_BITS)
 
 #if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS
 #error Allocator MAX_ORDER exceeds SECTION_SIZE
@@ -769,7 +772,9 @@ struct mem_section {
         * before using it wrong.
         */
        unsigned long section_mem_map;
-       DECLARE_BITMAP(pageblock_flags, SECTION_BLOCKFLAGS_BITS);
+
+       /* See declaration of similar field in struct zone */
+       unsigned long *pageblock_flags;
 };
 
 #ifdef CONFIG_SPARSEMEM_EXTREME