[mirror_ubuntu-zesty-kernel.git] / include / linux / mm_types.h

#ifndef _LINUX_MM_TYPES_H
#define _LINUX_MM_TYPES_H

#include <linux/auxvec.h>
#include <linux/types.h>
#include <linux/threads.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/rbtree.h>
#include <linux/rwsem.h>
#include <linux/completion.h>
#include <linux/cpumask.h>
#include <linux/page-debug-flags.h>
#include <linux/uprobes.h>
#include <asm/page.h>
#include <asm/mmu.h>

#ifndef AT_VECTOR_SIZE_ARCH
#define AT_VECTOR_SIZE_ARCH 0
#endif
#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))

struct address_space;

#define USE_SPLIT_PTLOCKS	(NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)

/*
 * Each physical page in the system has a struct page associated with
 * it to keep track of whatever it is we are using the page for at the
 * moment. Note that we have no way to track which tasks are using
 * a page, though if it is a pagecache page, rmap structures can tell us
 * who is mapping it.
 *
 * The objects in struct page are organized in double word blocks in
 * order to allows us to use atomic double word operations on portions
 * of struct page. That is currently only used by slub but the arrangement
 * allows the use of atomic double word operations on the flags/mapping
 * and lru list pointers also.
 */
struct page {
	/* First double word block */
	unsigned long flags;		/* Atomic flags, some possibly
					 * updated asynchronously */
	struct address_space *mapping;	/* If low bit clear, points to
					 * inode address_space, or NULL.
					 * If page mapped as anonymous
					 * memory, low bit is set, and
					 * it points to anon_vma object:
					 * see PAGE_MAPPING_ANON below.
					 */
	/* Second double word */
	struct {
		union {
			pgoff_t index;		/* Our offset within mapping. */
			void *freelist;		/* slub/slob first free object */
			bool pfmemalloc;	/* If set by the page allocator,
						 * ALLOC_NO_WATERMARKS was set
						 * and the low watermark was not
						 * met implying that the system
						 * is under some pressure. The
						 * caller should try ensure
						 * this page is only used to
						 * free other pages.
						 */
		};

		union {
#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
	defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
			/* Used for cmpxchg_double in slub */
			unsigned long counters;
#else
			/*
			 * Keep _count separate from slub cmpxchg_double data.
			 * As the rest of the double word is protected by
			 * slab_lock but _count is not.
			 */
			unsigned counters;
#endif

			struct {

				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.
					 */
					atomic_t _mapcount;

					struct { /* SLUB */
						unsigned inuse:16;
						unsigned objects:15;
						unsigned frozen:1;
					};
					int units;	/* SLOB */
				};
				atomic_t _count;		/* Usage count, see below. */
			};
		};
	};

	/* Third double word block */
	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
		};

		struct list_head list;	/* slobs list of pages */
		struct {		/* slab fields */
			struct kmem_cache *slab_cache;
			struct slab *slab_page;
		};
	};

	/* Remainder is not double word aligned */
	union {
		unsigned long private;		/* Mapping-private opaque data:
					 	 * usually used for buffer_heads
						 * if PagePrivate set; used for
						 * swp_entry_t if PageSwapCache;
						 * indicates order in the buddy
						 * system if PG_buddy is set.
						 */
#if USE_SPLIT_PTLOCKS
		spinlock_t ptl;
#endif
		struct kmem_cache *slab;	/* SLUB: Pointer to slab */
		struct page *first_page;	/* Compound tail pages */
	};

	/*
	 * On machines where all RAM is mapped into kernel address space,
	 * we can simply calculate the virtual address. On machines with
	 * highmem some memory is mapped into kernel virtual memory
	 * dynamically, so we need a place to store that address.
	 * Note that this field could be 16 bits on x86 ... ;)
	 *
	 * Architectures with slow multiplication can define
	 * WANT_PAGE_VIRTUAL in asm/page.h
	 */
#if defined(WANT_PAGE_VIRTUAL)
	void *virtual;			/* Kernel virtual address (NULL if
					   not kmapped, ie. highmem) */
#endif /* WANT_PAGE_VIRTUAL */
#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
	unsigned long debug_flags;	/* Use atomic bitops on this */
#endif

#ifdef CONFIG_KMEMCHECK
	/*
	 * kmemcheck wants to track the status of each byte in a page; this
	 * is a pointer to such a status block. NULL if not tracked.
	 */
	void *shadow;
#endif
}
/*
 * The struct page can be forced to be double word aligned so that atomic ops
 * on double words work. The SLUB allocator can make use of such a feature.
 */
#ifdef CONFIG_HAVE_ALIGNED_STRUCT_PAGE
	__aligned(2 * sizeof(unsigned long))
#endif
;

struct page_frag {
	struct page *page;
#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
	__u32 offset;
	__u32 size;
#else
	__u16 offset;
	__u16 size;
#endif
};

typedef unsigned long __nocast vm_flags_t;

/*
 * A region containing a mapping of a non-memory backed file under NOMMU
 * conditions.  These are held in a global tree and are pinned by the VMAs that
 * map parts of them.
 */
struct vm_region {
	struct rb_node	vm_rb;		/* link in global region tree */
	vm_flags_t	vm_flags;	/* VMA vm_flags */
	unsigned long	vm_start;	/* start address of region */
	unsigned long	vm_end;		/* region initialised to here */
	unsigned long	vm_top;		/* region allocated to here */
	unsigned long	vm_pgoff;	/* the offset in vm_file corresponding to vm_start */
	struct file	*vm_file;	/* the backing file or NULL */

	int		vm_usage;	/* region usage count (access under nommu_region_sem) */
	bool		vm_icache_flushed : 1; /* true if the icache has been flushed for
						* this region */
};

/*
 * This struct defines a memory VMM memory area. There is one of these
 * per VM-area/task.  A VM area is any part of the process virtual memory
 * space that has a special rule for the page-fault handlers (ie a shared
 * library, the executable area etc).
 */
struct vm_area_struct {
	struct mm_struct * vm_mm;	/* The address space we belong to. */
	unsigned long vm_start;		/* Our start address within vm_mm. */
	unsigned long vm_end;		/* The first byte after our end address
					   within vm_mm. */

	/* linked list of VM areas per task, sorted by address */
	struct vm_area_struct *vm_next, *vm_prev;

	pgprot_t vm_page_prot;		/* Access permissions of this VMA. */
	unsigned long vm_flags;		/* Flags, see mm.h. */

	struct rb_node vm_rb;

	/*
	 * For areas with an address space and backing store,
	 * linkage into the address_space->i_mmap interval tree, or
	 * linkage of vma in the address_space->i_mmap_nonlinear list.
	 */
	union {
		struct {
			struct rb_node rb;
			unsigned long rb_subtree_last;
		} linear;
		struct list_head nonlinear;
	} shared;

	/*
	 * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
	 * list, after a COW of one of the file pages.	A MAP_SHARED vma
	 * can only be in the i_mmap tree.  An anonymous MAP_PRIVATE, stack
	 * or brk vma (with NULL file) can only be in an anon_vma list.
	 */
	struct list_head anon_vma_chain; /* Serialized by mmap_sem &
					  * page_table_lock */
	struct anon_vma *anon_vma;	/* Serialized by page_table_lock */

	/* Function pointers to deal with this struct. */
	const struct vm_operations_struct *vm_ops;

	/* Information about our backing store: */
	unsigned long vm_pgoff;		/* Offset (within vm_file) in PAGE_SIZE
					   units, *not* PAGE_CACHE_SIZE */
	struct file * vm_file;		/* File we map to (can be NULL). */
	void * vm_private_data;		/* was vm_pte (shared mem) */

#ifndef CONFIG_MMU
	struct vm_region *vm_region;	/* NOMMU mapping region */
#endif
#ifdef CONFIG_NUMA
	struct mempolicy *vm_policy;	/* NUMA policy for the VMA */
#endif
};

struct core_thread {
	struct task_struct *task;
	struct core_thread *next;
};

struct core_state {
	atomic_t nr_threads;
	struct core_thread dumper;
	struct completion startup;
};

enum {
	MM_FILEPAGES,
	MM_ANONPAGES,
	MM_SWAPENTS,
	NR_MM_COUNTERS
};

#if USE_SPLIT_PTLOCKS && defined(CONFIG_MMU)
#define SPLIT_RSS_COUNTING
/* per-thread cached information, */
struct task_rss_stat {
	int events;	/* for synchronization threshold */
	int count[NR_MM_COUNTERS];
};
#endif /* USE_SPLIT_PTLOCKS */

struct mm_rss_stat {
	atomic_long_t count[NR_MM_COUNTERS];
};

struct mm_struct {
	struct vm_area_struct * mmap;		/* list of VMAs */
	struct rb_root mm_rb;
	struct vm_area_struct * mmap_cache;	/* last find_vma result */
#ifdef CONFIG_MMU
	unsigned long (*get_unmapped_area) (struct file *filp,
				unsigned long addr, unsigned long len,
				unsigned long pgoff, unsigned long flags);
	void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
#endif
	unsigned long mmap_base;		/* base of mmap area */
	unsigned long task_size;		/* size of task vm space */
	unsigned long cached_hole_size; 	/* if non-zero, the largest hole below free_area_cache */
	unsigned long free_area_cache;		/* first hole of size cached_hole_size or larger */
	pgd_t * pgd;
	atomic_t mm_users;			/* How many users with user space? */
	atomic_t mm_count;			/* How many references to "struct mm_struct" (users count as 1) */
	int map_count;				/* number of VMAs */

	spinlock_t page_table_lock;		/* Protects page tables and some counters */
	struct rw_semaphore mmap_sem;

	struct list_head mmlist;		/* List of maybe swapped mm's.	These are globally strung
						 * together off init_mm.mmlist, and are protected
						 * by mmlist_lock
						 */


	unsigned long hiwater_rss;	/* High-watermark of RSS usage */
	unsigned long hiwater_vm;	/* High-water virtual memory usage */

	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 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;

	unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */

	/*
	 * Special counters, in some configurations protected by the
	 * page_table_lock, in other configurations by being atomic.
	 */
	struct mm_rss_stat rss_stat;

	struct linux_binfmt *binfmt;

	cpumask_var_t cpu_vm_mask_var;

	/* Architecture-specific MM context */
	mm_context_t context;

	unsigned long flags; /* Must use atomic bitops to access the bits */

	struct core_state *core_state; /* coredumping support */
#ifdef CONFIG_AIO
	spinlock_t		ioctx_lock;
	struct hlist_head	ioctx_list;
#endif
#ifdef CONFIG_MM_OWNER
	/*
	 * "owner" points to a task that is regarded as the canonical
	 * user/owner of this mm. All of the following must be true in
	 * order for it to be changed:
	 *
	 * current == mm->owner
	 * current->mm != mm
	 * new_owner->mm == mm
	 * new_owner->alloc_lock is held
	 */
	struct task_struct __rcu *owner;
#endif

	/* store ref to file /proc/<pid>/exe symlink points to */
	struct file *exe_file;
#ifdef CONFIG_MMU_NOTIFIER
	struct mmu_notifier_mm *mmu_notifier_mm;
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	pgtable_t pmd_huge_pte; /* protected by page_table_lock */
#endif
#ifdef CONFIG_CPUMASK_OFFSTACK
	struct cpumask cpumask_allocation;
#endif
	struct uprobes_state uprobes_state;
};

static inline void mm_init_cpumask(struct mm_struct *mm)
{
#ifdef CONFIG_CPUMASK_OFFSTACK
	mm->cpu_vm_mask_var = &mm->cpumask_allocation;
#endif
}

/* Future-safe accessor for struct mm_struct's cpu_vm_mask. */
static inline cpumask_t *mm_cpumask(struct mm_struct *mm)
{
	return mm->cpu_vm_mask_var;
}

#endif /* _LINUX_MM_TYPES_H */
Commit	Line	Data
5b99cd0e HC	1	#ifndef _LINUX_MM_TYPES_H
	2	#define _LINUX_MM_TYPES_H
	3
4f9a58d7	4	#include <linux/auxvec.h>
5b99cd0e HC	5	#include <linux/types.h>
	6	#include <linux/threads.h>
	7	#include <linux/list.h>
	8	#include <linux/spinlock.h>
c92ff1bd MS	9	#include <linux/rbtree.h>
	10	#include <linux/rwsem.h>
	11	#include <linux/completion.h>
cddb8a5c	12	#include <linux/cpumask.h>
6a11f75b	13	#include <linux/page-debug-flags.h>
d4b3b638	14	#include <linux/uprobes.h>
c92ff1bd MS	15	#include <asm/page.h>
c92ff1bd MS	16	#include <asm/mmu.h>
5b99cd0e	17
4f9a58d7 OH	18	#ifndef AT_VECTOR_SIZE_ARCH
	19	#define AT_VECTOR_SIZE_ARCH 0
	20	#endif
	21	#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))
	22
5b99cd0e HC	23	struct address_space;
5b99cd0e HC	24
f7d0b926 JF	25	#define USE_SPLIT_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
f7d0b926 JF	26
5b99cd0e HC	27	/*
	28	* Each physical page in the system has a struct page associated with
	29	* it to keep track of whatever it is we are using the page for at the
	30	* moment. Note that we have no way to track which tasks are using
	31	* a page, though if it is a pagecache page, rmap structures can tell us
	32	* who is mapping it.
fc9bb8c7 CL	33	*
	34	* The objects in struct page are organized in double word blocks in
	35	* order to allows us to use atomic double word operations on portions
	36	* of struct page. That is currently only used by slub but the arrangement
	37	* allows the use of atomic double word operations on the flags/mapping
	38	* and lru list pointers also.
5b99cd0e HC	39	*/
5b99cd0e HC	40	struct page {
fc9bb8c7	41	/* First double word block */
5b99cd0e HC	42	unsigned long flags; /* Atomic flags, some possibly
5b99cd0e HC	43	* updated asynchronously */
fc9bb8c7 CL	44	struct address_space mapping; / If low bit clear, points to
	45	* inode address_space, or NULL.
	46	* If page mapped as anonymous
	47	* memory, low bit is set, and
	48	* it points to anon_vma object:
	49	* see PAGE_MAPPING_ANON below.
	50	*/
	51	/* Second double word */
013e8963 CL	52	struct {
013e8963 CL	53	union {
fc9bb8c7	54	pgoff_t index; /* Our offset within mapping. */
b8c24c4a	55	void freelist; / slub/slob first free object */
072bb0aa	56	bool pfmemalloc; /* If set by the page allocator,
b37f1dd0	57	* ALLOC_NO_WATERMARKS was set
072bb0aa MG	58	* and the low watermark was not
	59	* met implying that the system
	60	* is under some pressure. The
	61	* caller should try ensure
	62	* this page is only used to
	63	* free other pages.
	64	*/
013e8963 CL	65	};
	66
	67	union {
abca7c49 PS	68	#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
abca7c49 PS	69	defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
013e8963 CL	70	/* Used for cmpxchg_double in slub */
013e8963 CL	71	unsigned long counters;
abca7c49 PS	72	#else
	73	/*
	74	* Keep _count separate from slub cmpxchg_double data.
	75	* As the rest of the double word is protected by
	76	* slab_lock but _count is not.
	77	*/
	78	unsigned counters;
	79	#endif
013e8963 CL	80
	81	struct {
	82
	83	union {
70b50f94 AA	84	/*
	85	* Count of ptes mapped in
	86	* mms, to show when page is
	87	* mapped & limit reverse map
	88	* searches.
	89	*
	90	* Used also for tail pages
	91	* refcounting instead of
	92	* _count. Tail pages cannot
	93	* be mapped and keeping the
	94	* tail page _count zero at
	95	* all times guarantees
	96	* get_page_unless_zero() will
	97	* never succeed on tail
	98	* pages.
	99	*/
	100	atomic_t _mapcount;
fc9bb8c7	101
b8c24c4a	102	struct { /* SLUB */
013e8963 CL	103	unsigned inuse:16;
	104	unsigned objects:15;
	105	unsigned frozen:1;
	106	};
b8c24c4a	107	int units; /* SLOB */
3adf004d	108	};
013e8963	109	atomic_t _count; /* Usage count, see below. */
fc9bb8c7	110	};
39b26464	111	};
81819f0f	112	};
fc9bb8c7 CL	113
fc9bb8c7 CL	114	/* Third double word block */
49e22585 CL	115	union {
49e22585 CL	116	struct list_head lru; /* Pageout list, eg. active_list
fc9bb8c7 CL	117	* protected by zone->lru_lock !
fc9bb8c7 CL	118	*/
49e22585 CL	119	struct { /* slub per cpu partial pages */
	120	struct page next; / Next partial slab */
	121	#ifdef CONFIG_64BIT
	122	int pages; /* Nr of partial slabs left */
	123	int pobjects; /* Approximate # of objects */
	124	#else
	125	short int pages;
	126	short int pobjects;
	127	#endif
	128	};
b8c24c4a CL	129
b8c24c4a CL	130	struct list_head list; /* slobs list of pages */
e571b0ad CL	131	struct { /* slab fields */
	132	struct kmem_cache *slab_cache;
	133	struct slab *slab_page;
	134	};
49e22585	135	};
fc9bb8c7 CL	136
fc9bb8c7 CL	137	/* Remainder is not double word aligned */
5b99cd0e	138	union {
5b99cd0e HC	139	unsigned long private; /* Mapping-private opaque data:
	140	* usually used for buffer_heads
	141	* if PagePrivate set; used for
	142	* swp_entry_t if PageSwapCache;
	143	* indicates order in the buddy
	144	* system if PG_buddy is set.
	145	*/
f7d0b926	146	#if USE_SPLIT_PTLOCKS
fc9bb8c7	147	spinlock_t ptl;
5b99cd0e	148	#endif
fc9bb8c7 CL	149	struct kmem_cache slab; / SLUB: Pointer to slab */
fc9bb8c7 CL	150	struct page first_page; / Compound tail pages */
81819f0f	151	};
fc9bb8c7	152
5b99cd0e HC	153	/*
	154	* On machines where all RAM is mapped into kernel address space,
	155	* we can simply calculate the virtual address. On machines with
	156	* highmem some memory is mapped into kernel virtual memory
	157	* dynamically, so we need a place to store that address.
	158	* Note that this field could be 16 bits on x86 ... ;)
	159	*
	160	* Architectures with slow multiplication can define
	161	* WANT_PAGE_VIRTUAL in asm/page.h
	162	*/
	163	#if defined(WANT_PAGE_VIRTUAL)
	164	void virtual; / Kernel virtual address (NULL if
	165	not kmapped, ie. highmem) */
	166	#endif /* WANT_PAGE_VIRTUAL */
ee3b4290 AM	167	#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
	168	unsigned long debug_flags; /* Use atomic bitops on this */
	169	#endif
dfec072e VN	170
	171	#ifdef CONFIG_KMEMCHECK
	172	/*
	173	* kmemcheck wants to track the status of each byte in a page; this
	174	* is a pointer to such a status block. NULL if not tracked.
	175	*/
	176	void *shadow;
	177	#endif
fc9bb8c7 CL	178	}
fc9bb8c7 CL	179	/*
43570fd2 HC	180	* The struct page can be forced to be double word aligned so that atomic ops
43570fd2 HC	181	* on double words work. The SLUB allocator can make use of such a feature.
fc9bb8c7	182	*/
43570fd2 HC	183	#ifdef CONFIG_HAVE_ALIGNED_STRUCT_PAGE
43570fd2 HC	184	__aligned(2 * sizeof(unsigned long))
fc9bb8c7 CL	185	#endif
fc9bb8c7 CL	186	;
5b99cd0e	187
30d3c128 IC	188	struct page_frag {
	189	struct page *page;
	190	#if (BITS_PER_LONG > 32) \|\| (PAGE_SIZE >= 65536)
	191	__u32 offset;
	192	__u32 size;
	193	#else
	194	__u16 offset;
	195	__u16 size;
	196	#endif
	197	};
	198
ca16d140 KM	199	typedef unsigned long __nocast vm_flags_t;
ca16d140 KM	200
8feae131 DH	201	/*
	202	* A region containing a mapping of a non-memory backed file under NOMMU
	203	* conditions. These are held in a global tree and are pinned by the VMAs that
	204	* map parts of them.
	205	*/
	206	struct vm_region {
	207	struct rb_node vm_rb; /* link in global region tree */
ca16d140	208	vm_flags_t vm_flags; /* VMA vm_flags */
8feae131 DH	209	unsigned long vm_start; /* start address of region */
8feae131 DH	210	unsigned long vm_end; /* region initialised to here */
dd8632a1	211	unsigned long vm_top; /* region allocated to here */
8feae131 DH	212	unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */
	213	struct file vm_file; / the backing file or NULL */
	214
1e2ae599	215	int vm_usage; /* region usage count (access under nommu_region_sem) */
cfe79c00 MF	216	bool vm_icache_flushed : 1; /* true if the icache has been flushed for
cfe79c00 MF	217	* this region */
8feae131 DH	218	};
8feae131 DH	219
c92ff1bd MS	220	/*
	221	* This struct defines a memory VMM memory area. There is one of these
	222	* per VM-area/task. A VM area is any part of the process virtual memory
	223	* space that has a special rule for the page-fault handlers (ie a shared
	224	* library, the executable area etc).
	225	*/
	226	struct vm_area_struct {
	227	struct mm_struct * vm_mm; /* The address space we belong to. */
	228	unsigned long vm_start; /* Our start address within vm_mm. */
	229	unsigned long vm_end; /* The first byte after our end address
	230	within vm_mm. */
	231
	232	/* linked list of VM areas per task, sorted by address */
297c5eee	233	struct vm_area_struct vm_next, vm_prev;
c92ff1bd MS	234
c92ff1bd MS	235	pgprot_t vm_page_prot; /* Access permissions of this VMA. */
605d9288	236	unsigned long vm_flags; /* Flags, see mm.h. */
c92ff1bd MS	237
	238	struct rb_node vm_rb;
	239
	240	/*
	241	* For areas with an address space and backing store,
6b2dbba8	242	* linkage into the address_space->i_mmap interval tree, or
c92ff1bd MS	243	* linkage of vma in the address_space->i_mmap_nonlinear list.
	244	*/
	245	union {
	246	struct {
6b2dbba8 ML	247	struct rb_node rb;
	248	unsigned long rb_subtree_last;
	249	} linear;
	250	struct list_head nonlinear;
c92ff1bd MS	251	} shared;
	252
	253	/*
	254	* A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
	255	* list, after a COW of one of the file pages. A MAP_SHARED vma
	256	* can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
	257	* or brk vma (with NULL file) can only be in an anon_vma list.
	258	*/
5beb4930 RR	259	struct list_head anon_vma_chain; /* Serialized by mmap_sem &
5beb4930 RR	260	* page_table_lock */
c92ff1bd MS	261	struct anon_vma anon_vma; / Serialized by page_table_lock */
	262
	263	/* Function pointers to deal with this struct. */
f0f37e2f	264	const struct vm_operations_struct *vm_ops;
c92ff1bd MS	265
	266	/* Information about our backing store: */
	267	unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
	268	units, not PAGE_CACHE_SIZE */
	269	struct file * vm_file; /* File we map to (can be NULL). */
	270	void * vm_private_data; /* was vm_pte (shared mem) */
c92ff1bd MS	271
c92ff1bd MS	272	#ifndef CONFIG_MMU
8feae131	273	struct vm_region vm_region; / NOMMU mapping region */
c92ff1bd MS	274	#endif
	275	#ifdef CONFIG_NUMA
	276	struct mempolicy vm_policy; / NUMA policy for the VMA */
	277	#endif
	278	};
	279
b564daf8 ON	280	struct core_thread {
	281	struct task_struct *task;
	282	struct core_thread *next;
	283	};
	284
32ecb1f2	285	struct core_state {
c5f1cc8c	286	atomic_t nr_threads;
b564daf8	287	struct core_thread dumper;
32ecb1f2 ON	288	struct completion startup;
	289	};
	290
d559db08 KH	291	enum {
	292	MM_FILEPAGES,
	293	MM_ANONPAGES,
b084d435	294	MM_SWAPENTS,
d559db08 KH	295	NR_MM_COUNTERS
	296	};
	297
53bddb4e	298	#if USE_SPLIT_PTLOCKS && defined(CONFIG_MMU)
34e55232	299	#define SPLIT_RSS_COUNTING
34e55232 KH	300	/* per-thread cached information, */
	301	struct task_rss_stat {
	302	int events; /* for synchronization threshold */
	303	int count[NR_MM_COUNTERS];
	304	};
172703b0 MF	305	#endif /* USE_SPLIT_PTLOCKS */
172703b0 MF	306
d559db08	307	struct mm_rss_stat {
172703b0	308	atomic_long_t count[NR_MM_COUNTERS];
d559db08	309	};
d559db08	310
c92ff1bd MS	311	struct mm_struct {
	312	struct vm_area_struct * mmap; /* list of VMAs */
	313	struct rb_root mm_rb;
	314	struct vm_area_struct * mmap_cache; /* last find_vma result */
efc1a3b1	315	#ifdef CONFIG_MMU
c92ff1bd MS	316	unsigned long (get_unmapped_area) (struct file filp,
	317	unsigned long addr, unsigned long len,
	318	unsigned long pgoff, unsigned long flags);
	319	void (unmap_area) (struct mm_struct mm, unsigned long addr);
efc1a3b1	320	#endif
c92ff1bd MS	321	unsigned long mmap_base; /* base of mmap area */
	322	unsigned long task_size; /* size of task vm space */
	323	unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
	324	unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
	325	pgd_t * pgd;
	326	atomic_t mm_users; /* How many users with user space? */
	327	atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
	328	int map_count; /* number of VMAs */
481b4bb5	329
c92ff1bd	330	spinlock_t page_table_lock; /* Protects page tables and some counters */
481b4bb5	331	struct rw_semaphore mmap_sem;
c92ff1bd MS	332
	333	struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
	334	* together off init_mm.mmlist, and are protected
	335	* by mmlist_lock
	336	*/
	337
c92ff1bd MS	338
	339	unsigned long hiwater_rss; /* High-watermark of RSS usage */
	340	unsigned long hiwater_vm; /* High-water virtual memory usage */
	341
e10d59f2 CL	342	unsigned long total_vm; /* Total pages mapped */
	343	unsigned long locked_vm; /* Pages that have PG_mlocked set */
	344	unsigned long pinned_vm; /* Refcount permanently increased */
	345	unsigned long shared_vm; /* Shared pages (files) */
	346	unsigned long exec_vm; /* VM_EXEC & ~VM_WRITE */
	347	unsigned long stack_vm; /* VM_GROWSUP/DOWN */
e10d59f2 CL	348	unsigned long def_flags;
e10d59f2 CL	349	unsigned long nr_ptes; /* Page table pages */
c92ff1bd MS	350	unsigned long start_code, end_code, start_data, end_data;
	351	unsigned long start_brk, brk, start_stack;
	352	unsigned long arg_start, arg_end, env_start, env_end;
	353
	354	unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
	355
d559db08 KH	356	/*
	357	* Special counters, in some configurations protected by the
	358	* page_table_lock, in other configurations by being atomic.
	359	*/
	360	struct mm_rss_stat rss_stat;
	361
801460d0 HS	362	struct linux_binfmt *binfmt;
801460d0 HS	363
6345d24d LT	364	cpumask_var_t cpu_vm_mask_var;
6345d24d LT	365
c92ff1bd MS	366	/* Architecture-specific MM context */
	367	mm_context_t context;
	368
c92ff1bd MS	369	unsigned long flags; /* Must use atomic bitops to access the bits */
c92ff1bd MS	370
a94e2d40	371	struct core_state core_state; / coredumping support */
858f0993	372	#ifdef CONFIG_AIO
abf137dd JA	373	spinlock_t ioctx_lock;
abf137dd JA	374	struct hlist_head ioctx_list;
858f0993	375	#endif
cf475ad2	376	#ifdef CONFIG_MM_OWNER
4cd1a8fc KM	377	/*
	378	* "owner" points to a task that is regarded as the canonical
	379	* user/owner of this mm. All of the following must be true in
	380	* order for it to be changed:
	381	*
	382	* current == mm->owner
	383	* current->mm != mm
	384	* new_owner->mm == mm
	385	* new_owner->alloc_lock is held
	386	*/
4d2deb40	387	struct task_struct __rcu *owner;
78fb7466	388	#endif
925d1c40	389
925d1c40 MH	390	/* store ref to file /proc/<pid>/exe symlink points to */
925d1c40 MH	391	struct file *exe_file;
cddb8a5c AA	392	#ifdef CONFIG_MMU_NOTIFIER
cddb8a5c AA	393	struct mmu_notifier_mm *mmu_notifier_mm;
e7a00c45 AA	394	#endif
	395	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	396	pgtable_t pmd_huge_pte; /* protected by page_table_lock */
cddb8a5c	397	#endif
6345d24d LT	398	#ifdef CONFIG_CPUMASK_OFFSTACK
	399	struct cpumask cpumask_allocation;
	400	#endif
d4b3b638	401	struct uprobes_state uprobes_state;
c92ff1bd MS	402	};
c92ff1bd MS	403
6345d24d LT	404	static inline void mm_init_cpumask(struct mm_struct *mm)
	405	{
	406	#ifdef CONFIG_CPUMASK_OFFSTACK
	407	mm->cpu_vm_mask_var = &mm->cpumask_allocation;
	408	#endif
	409	}
	410
45e575ab	411	/* Future-safe accessor for struct mm_struct's cpu_vm_mask. */
de03c72c KM	412	static inline cpumask_t mm_cpumask(struct mm_struct mm)
	413	{
	414	return mm->cpu_vm_mask_var;
	415	}
45e575ab	416
5b99cd0e	417	#endif /* _LINUX_MM_TYPES_H */