[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/prio_tree.h>
#include <linux/rbtree.h>
#include <linux/rwsem.h>
#include <linux/completion.h>
#include <linux/cpumask.h>
#include <linux/page-debug-flags.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 first free object */
		};

		union {
			/* Used for cmpxchg_double in slub */
			unsigned long counters;

			struct {

				union {
					atomic_t _mapcount;	/* Count of ptes mapped in mms,
							 * to show when page is mapped
							 * & limit reverse map searches.
							 */

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

	/* Third double word block */
	struct list_head lru;		/* Pageout list, eg. active_list
					 * protected by zone->lru_lock !
					 */

	/* 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
}
/*
 * If another subsystem starts using the double word pairing for atomic
 * operations on struct page then it must change the #if to ensure
 * proper alignment of the page struct.
 */
#if defined(CONFIG_SLUB) && defined(CONFIG_CMPXCHG_LOCAL)
	__attribute__((__aligned__(2*sizeof(unsigned long))))
#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 prio tree, or
	 * linkage to the list of like vmas hanging off its node, or
	 * linkage of vma in the address_space->i_mmap_nonlinear list.
	 */
	union {
		struct {
			struct list_head list;
			void *parent;	/* aligns with prio_tree_node parent */
			struct vm_area_struct *head;
		} vm_set;

		struct raw_prio_tree_node prio_tree_node;
	} 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, locked_vm, shared_vm, exec_vm;
	unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
	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;

	/* Swap token stuff */
	/*
	 * Last value of global fault stamp as seen by this process.
	 * In other words, this value gives an indication of how long
	 * it has been since this task got the token.
	 * Look at mm/thrash.c
	 */
	unsigned int faultstamp;
	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 */
#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;
	unsigned long num_exe_file_vmas;
#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
};

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/prio_tree.h>
	10	#include <linux/rbtree.h>
	11	#include <linux/rwsem.h>
	12	#include <linux/completion.h>
cddb8a5c	13	#include <linux/cpumask.h>
6a11f75b	14	#include <linux/page-debug-flags.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. */
013e8963 CL	55	void freelist; / slub first free object */
	56	};
	57
	58	union {
	59	/* Used for cmpxchg_double in slub */
	60	unsigned long counters;
	61
	62	struct {
	63
	64	union {
	65	atomic_t _mapcount; /* Count of ptes mapped in mms,
fc9bb8c7 CL	66	* to show when page is mapped
	67	* & limit reverse map searches.
	68	*/
fc9bb8c7	69
013e8963 CL	70	struct {
	71	unsigned inuse:16;
	72	unsigned objects:15;
	73	unsigned frozen:1;
	74	};
3adf004d	75	};
013e8963	76	atomic_t _count; /* Usage count, see below. */
fc9bb8c7	77	};
39b26464	78	};
81819f0f	79	};
fc9bb8c7 CL	80
	81	/* Third double word block */
	82	struct list_head lru; /* Pageout list, eg. active_list
	83	* protected by zone->lru_lock !
	84	*/
	85
	86	/* Remainder is not double word aligned */
5b99cd0e	87	union {
5b99cd0e HC	88	unsigned long private; /* Mapping-private opaque data:
	89	* usually used for buffer_heads
	90	* if PagePrivate set; used for
	91	* swp_entry_t if PageSwapCache;
	92	* indicates order in the buddy
	93	* system if PG_buddy is set.
	94	*/
f7d0b926	95	#if USE_SPLIT_PTLOCKS
fc9bb8c7	96	spinlock_t ptl;
5b99cd0e	97	#endif
fc9bb8c7 CL	98	struct kmem_cache slab; / SLUB: Pointer to slab */
fc9bb8c7 CL	99	struct page first_page; / Compound tail pages */
81819f0f	100	};
fc9bb8c7	101
5b99cd0e HC	102	/*
	103	* On machines where all RAM is mapped into kernel address space,
	104	* we can simply calculate the virtual address. On machines with
	105	* highmem some memory is mapped into kernel virtual memory
	106	* dynamically, so we need a place to store that address.
	107	* Note that this field could be 16 bits on x86 ... ;)
	108	*
	109	* Architectures with slow multiplication can define
	110	* WANT_PAGE_VIRTUAL in asm/page.h
	111	*/
	112	#if defined(WANT_PAGE_VIRTUAL)
	113	void virtual; / Kernel virtual address (NULL if
	114	not kmapped, ie. highmem) */
	115	#endif /* WANT_PAGE_VIRTUAL */
ee3b4290 AM	116	#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
	117	unsigned long debug_flags; /* Use atomic bitops on this */
	118	#endif
dfec072e VN	119
	120	#ifdef CONFIG_KMEMCHECK
	121	/*
	122	* kmemcheck wants to track the status of each byte in a page; this
	123	* is a pointer to such a status block. NULL if not tracked.
	124	*/
	125	void *shadow;
	126	#endif
fc9bb8c7 CL	127	}
	128	/*
	129	* If another subsystem starts using the double word pairing for atomic
	130	* operations on struct page then it must change the #if to ensure
	131	* proper alignment of the page struct.
	132	*/
	133	#if defined(CONFIG_SLUB) && defined(CONFIG_CMPXCHG_LOCAL)
	134	__attribute__((__aligned__(2*sizeof(unsigned long))))
	135	#endif
	136	;
5b99cd0e	137
ca16d140 KM	138	typedef unsigned long __nocast vm_flags_t;
ca16d140 KM	139
8feae131 DH	140	/*
	141	* A region containing a mapping of a non-memory backed file under NOMMU
	142	* conditions. These are held in a global tree and are pinned by the VMAs that
	143	* map parts of them.
	144	*/
	145	struct vm_region {
	146	struct rb_node vm_rb; /* link in global region tree */
ca16d140	147	vm_flags_t vm_flags; /* VMA vm_flags */
8feae131 DH	148	unsigned long vm_start; /* start address of region */
8feae131 DH	149	unsigned long vm_end; /* region initialised to here */
dd8632a1	150	unsigned long vm_top; /* region allocated to here */
8feae131 DH	151	unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */
	152	struct file vm_file; / the backing file or NULL */
	153
1e2ae599	154	int vm_usage; /* region usage count (access under nommu_region_sem) */
cfe79c00 MF	155	bool vm_icache_flushed : 1; /* true if the icache has been flushed for
cfe79c00 MF	156	* this region */
8feae131 DH	157	};
8feae131 DH	158
c92ff1bd MS	159	/*
	160	* This struct defines a memory VMM memory area. There is one of these
	161	* per VM-area/task. A VM area is any part of the process virtual memory
	162	* space that has a special rule for the page-fault handlers (ie a shared
	163	* library, the executable area etc).
	164	*/
	165	struct vm_area_struct {
	166	struct mm_struct * vm_mm; /* The address space we belong to. */
	167	unsigned long vm_start; /* Our start address within vm_mm. */
	168	unsigned long vm_end; /* The first byte after our end address
	169	within vm_mm. */
	170
	171	/* linked list of VM areas per task, sorted by address */
297c5eee	172	struct vm_area_struct vm_next, vm_prev;
c92ff1bd MS	173
c92ff1bd MS	174	pgprot_t vm_page_prot; /* Access permissions of this VMA. */
605d9288	175	unsigned long vm_flags; /* Flags, see mm.h. */
c92ff1bd MS	176
	177	struct rb_node vm_rb;
	178
	179	/*
	180	* For areas with an address space and backing store,
	181	* linkage into the address_space->i_mmap prio tree, or
	182	* linkage to the list of like vmas hanging off its node, or
	183	* linkage of vma in the address_space->i_mmap_nonlinear list.
	184	*/
	185	union {
	186	struct {
	187	struct list_head list;
	188	void parent; / aligns with prio_tree_node parent */
	189	struct vm_area_struct *head;
	190	} vm_set;
	191
	192	struct raw_prio_tree_node prio_tree_node;
	193	} shared;
	194
	195	/*
	196	* A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
	197	* list, after a COW of one of the file pages. A MAP_SHARED vma
	198	* can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
	199	* or brk vma (with NULL file) can only be in an anon_vma list.
	200	*/
5beb4930 RR	201	struct list_head anon_vma_chain; /* Serialized by mmap_sem &
5beb4930 RR	202	* page_table_lock */
c92ff1bd MS	203	struct anon_vma anon_vma; / Serialized by page_table_lock */
	204
	205	/* Function pointers to deal with this struct. */
f0f37e2f	206	const struct vm_operations_struct *vm_ops;
c92ff1bd MS	207
	208	/* Information about our backing store: */
	209	unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
	210	units, not PAGE_CACHE_SIZE */
	211	struct file * vm_file; /* File we map to (can be NULL). */
	212	void * vm_private_data; /* was vm_pte (shared mem) */
c92ff1bd MS	213
c92ff1bd MS	214	#ifndef CONFIG_MMU
8feae131	215	struct vm_region vm_region; / NOMMU mapping region */
c92ff1bd MS	216	#endif
	217	#ifdef CONFIG_NUMA
	218	struct mempolicy vm_policy; / NUMA policy for the VMA */
	219	#endif
	220	};
	221
b564daf8 ON	222	struct core_thread {
	223	struct task_struct *task;
	224	struct core_thread *next;
	225	};
	226
32ecb1f2	227	struct core_state {
c5f1cc8c	228	atomic_t nr_threads;
b564daf8	229	struct core_thread dumper;
32ecb1f2 ON	230	struct completion startup;
	231	};
	232
d559db08 KH	233	enum {
	234	MM_FILEPAGES,
	235	MM_ANONPAGES,
b084d435	236	MM_SWAPENTS,
d559db08 KH	237	NR_MM_COUNTERS
	238	};
	239
53bddb4e	240	#if USE_SPLIT_PTLOCKS && defined(CONFIG_MMU)
34e55232	241	#define SPLIT_RSS_COUNTING
34e55232 KH	242	/* per-thread cached information, */
	243	struct task_rss_stat {
	244	int events; /* for synchronization threshold */
	245	int count[NR_MM_COUNTERS];
	246	};
172703b0 MF	247	#endif /* USE_SPLIT_PTLOCKS */
172703b0 MF	248
d559db08	249	struct mm_rss_stat {
172703b0	250	atomic_long_t count[NR_MM_COUNTERS];
d559db08	251	};
d559db08	252
c92ff1bd MS	253	struct mm_struct {
	254	struct vm_area_struct * mmap; /* list of VMAs */
	255	struct rb_root mm_rb;
	256	struct vm_area_struct * mmap_cache; /* last find_vma result */
efc1a3b1	257	#ifdef CONFIG_MMU
c92ff1bd MS	258	unsigned long (get_unmapped_area) (struct file filp,
	259	unsigned long addr, unsigned long len,
	260	unsigned long pgoff, unsigned long flags);
	261	void (unmap_area) (struct mm_struct mm, unsigned long addr);
efc1a3b1	262	#endif
c92ff1bd MS	263	unsigned long mmap_base; /* base of mmap area */
	264	unsigned long task_size; /* size of task vm space */
	265	unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
	266	unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
	267	pgd_t * pgd;
	268	atomic_t mm_users; /* How many users with user space? */
	269	atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
	270	int map_count; /* number of VMAs */
481b4bb5	271
c92ff1bd	272	spinlock_t page_table_lock; /* Protects page tables and some counters */
481b4bb5	273	struct rw_semaphore mmap_sem;
c92ff1bd MS	274
	275	struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
	276	* together off init_mm.mmlist, and are protected
	277	* by mmlist_lock
	278	*/
	279
c92ff1bd MS	280
	281	unsigned long hiwater_rss; /* High-watermark of RSS usage */
	282	unsigned long hiwater_vm; /* High-water virtual memory usage */
	283
	284	unsigned long total_vm, locked_vm, shared_vm, exec_vm;
	285	unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
	286	unsigned long start_code, end_code, start_data, end_data;
	287	unsigned long start_brk, brk, start_stack;
	288	unsigned long arg_start, arg_end, env_start, env_end;
	289
	290	unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
	291
d559db08 KH	292	/*
	293	* Special counters, in some configurations protected by the
	294	* page_table_lock, in other configurations by being atomic.
	295	*/
	296	struct mm_rss_stat rss_stat;
	297
801460d0 HS	298	struct linux_binfmt *binfmt;
801460d0 HS	299
6345d24d LT	300	cpumask_var_t cpu_vm_mask_var;
6345d24d LT	301
c92ff1bd MS	302	/* Architecture-specific MM context */
	303	mm_context_t context;
	304
	305	/* Swap token stuff */
	306	/*
	307	* Last value of global fault stamp as seen by this process.
	308	* In other words, this value gives an indication of how long
	309	* it has been since this task got the token.
	310	* Look at mm/thrash.c
	311	*/
	312	unsigned int faultstamp;
	313	unsigned int token_priority;
	314	unsigned int last_interval;
	315
481b4bb5 RK	316	/* How many tasks sharing this mm are OOM_DISABLE */
	317	atomic_t oom_disable_count;
	318
c92ff1bd MS	319	unsigned long flags; /* Must use atomic bitops to access the bits */
c92ff1bd MS	320
a94e2d40	321	struct core_state core_state; / coredumping support */
858f0993	322	#ifdef CONFIG_AIO
abf137dd JA	323	spinlock_t ioctx_lock;
abf137dd JA	324	struct hlist_head ioctx_list;
858f0993	325	#endif
cf475ad2	326	#ifdef CONFIG_MM_OWNER
4cd1a8fc KM	327	/*
	328	* "owner" points to a task that is regarded as the canonical
	329	* user/owner of this mm. All of the following must be true in
	330	* order for it to be changed:
	331	*
	332	* current == mm->owner
	333	* current->mm != mm
	334	* new_owner->mm == mm
	335	* new_owner->alloc_lock is held
	336	*/
4d2deb40	337	struct task_struct __rcu *owner;
78fb7466	338	#endif
925d1c40	339
925d1c40 MH	340	/* store ref to file /proc/<pid>/exe symlink points to */
	341	struct file *exe_file;
	342	unsigned long num_exe_file_vmas;
cddb8a5c AA	343	#ifdef CONFIG_MMU_NOTIFIER
cddb8a5c AA	344	struct mmu_notifier_mm *mmu_notifier_mm;
e7a00c45 AA	345	#endif
	346	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	347	pgtable_t pmd_huge_pte; /* protected by page_table_lock */
cddb8a5c	348	#endif
6345d24d LT	349	#ifdef CONFIG_CPUMASK_OFFSTACK
	350	struct cpumask cpumask_allocation;
	351	#endif
c92ff1bd MS	352	};
c92ff1bd MS	353
6345d24d LT	354	static inline void mm_init_cpumask(struct mm_struct *mm)
	355	{
	356	#ifdef CONFIG_CPUMASK_OFFSTACK
	357	mm->cpu_vm_mask_var = &mm->cpumask_allocation;
	358	#endif
	359	}
	360
45e575ab	361	/* Future-safe accessor for struct mm_struct's cpu_vm_mask. */
de03c72c KM	362	static inline cpumask_t mm_cpumask(struct mm_struct mm)
	363	{
	364	return mm->cpu_vm_mask_var;
	365	}
45e575ab	366
5b99cd0e	367	#endif /* _LINUX_MM_TYPES_H */