mm: add comments to explain mm_struct fields

[pandora-kernel.git] / include / linux / mm_types.h

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 29971a5..3e01a19 100644 (file)
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -79,9 +79,21 @@ struct page {
        };
 
        /* Third double word block */
-       struct list_head lru;           /* Pageout list, eg. active_list
+       union {
+               struct list_head lru;   /* Pageout list, eg. active_list
                                         * protected by zone->lru_lock !
                                         */
+               struct {                /* slub per cpu partial pages */
+                       struct page *next;      /* Next partial slab */
+#ifdef CONFIG_64BIT
+                       int pages;      /* Nr of partial slabs left */
+                       int pobjects;   /* Approximate # of objects */
+#else
+                       short int pages;
+                       short int pobjects;
+#endif
+               };
+       };
 
        /* Remainder is not double word aligned */
        union {
@@ -292,8 +304,15 @@ struct mm_struct {
        unsigned long hiwater_rss;      /* High-watermark of RSS usage */
        unsigned long hiwater_vm;       /* High-water virtual memory usage */
 
-       unsigned long total_vm, locked_vm, shared_vm, exec_vm;
-       unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
+       unsigned long total_vm;         /* Total pages mapped */
+       unsigned long locked_vm;        /* Pages that have PG_mlocked set */
+       unsigned long pinned_vm;        /* Refcount permanently increased */
+       unsigned long shared_vm;        /* Shared pages (files) */
+       unsigned long exec_vm;          /* VM_EXEC & ~VM_WRITE */
+       unsigned long stack_vm;         /* VM_GROWSUP/DOWN */
+       unsigned long reserved_vm;      /* VM_RESERVED|VM_IO pages */
+       unsigned long def_flags;
+       unsigned long nr_ptes;          /* Page table pages */
        unsigned long start_code, end_code, start_data, end_data;
        unsigned long start_brk, brk, start_stack;
        unsigned long arg_start, arg_end, env_start, env_end;
@@ -324,9 +343,6 @@ struct mm_struct {
        unsigned int token_priority;
        unsigned int last_interval;
 
-       /* How many tasks sharing this mm are OOM_DISABLE */
-       atomic_t oom_disable_count;
-
        unsigned long flags; /* Must use atomic bitops to access the bits */
 
        struct core_state *core_state; /* coredumping support */