* see PAGE_MAPPING_ANON below.
*/
void *s_mem; /* slab first object */
+ atomic_t compound_mapcount; /* first tail page */
+ /* page_deferred_list().next -- second tail page */
};
/* Second double word */
union {
pgoff_t index; /* Our offset within mapping. */
void *freelist; /* sl[aou]b first free object */
+ /* page_deferred_list().prev -- second tail page */
};
union {
union {
/*
- * Count of ptes mapped in
- * mms, to show when page is
- * mapped & limit reverse map
- * searches.
- *
- * Used also for tail pages
- * refcounting instead of
- * _count. Tail pages cannot
- * be mapped and keeping the
- * tail page _count zero at
- * all times guarantees
- * get_page_unless_zero() will
- * never succeed on tail
- * pages.
+ * Count of ptes mapped in mms, to show
+ * when page is mapped & limit reverse
+ * map searches.
*/
atomic_t _mapcount;
* Can be used as a generic list
* by the page owner.
*/
+ struct dev_pagemap *pgmap; /* ZONE_DEVICE pages are never on an
+ * lru or handled by a slab
+ * allocator, this points to the
+ * hosting device page map.
+ */
struct { /* slub per cpu partial pages */
struct page *next; /* Next partial slab */
#ifdef CONFIG_64BIT
};
enum {
- MM_FILEPAGES,
- MM_ANONPAGES,
- MM_SWAPENTS,
+ MM_FILEPAGES, /* Resident file mapping pages */
+ MM_ANONPAGES, /* Resident anonymous pages */
+ MM_SWAPENTS, /* Anonymous swap entries */
+ MM_SHMEMPAGES, /* Resident shared memory pages */
NR_MM_COUNTERS
};
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 data_vm; /* VM_WRITE & ~VM_SHARED/GROWSDOWN */
unsigned long exec_vm; /* VM_EXEC & ~VM_WRITE */
unsigned long stack_vm; /* VM_GROWSUP/DOWN */
unsigned long def_flags;