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

			/* Used for cmpxchg_double in slub */
			unsigned long counters;
			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 */
ea6bd8ee CL	52	struct {
ea6bd8ee CL	53	union {
fc9bb8c7	54	pgoff_t index; /* Our offset within mapping. */
ea6bd8ee CL	55	void freelist; / slub first free object */
	56	};
	57
	58	union {
fc9bb8c7 CL	59	atomic_t _mapcount; /* Count of ptes mapped in mms,
	60	* to show when page is mapped
	61	* & limit reverse map searches.
	62	*/
fc9bb8c7	63
ea6bd8ee CL	64	/* Used for cmpxchg_double in slub */
	65	unsigned long counters;
	66	struct {
fc9bb8c7 CL	67	unsigned inuse:16;
	68	unsigned objects:15;
	69	unsigned frozen:1;
fc9bb8c7	70	};
39b26464	71	};
ea6bd8ee	72	atomic_t _count; /* Usage count, see below. */
81819f0f	73	};
fc9bb8c7 CL	74
	75	/* Third double word block */
	76	struct list_head lru; /* Pageout list, eg. active_list
	77	* protected by zone->lru_lock !
	78	*/
	79
	80	/* Remainder is not double word aligned */
5b99cd0e	81	union {
5b99cd0e HC	82	unsigned long private; /* Mapping-private opaque data:
	83	* usually used for buffer_heads
	84	* if PagePrivate set; used for
	85	* swp_entry_t if PageSwapCache;
	86	* indicates order in the buddy
	87	* system if PG_buddy is set.
	88	*/
f7d0b926	89	#if USE_SPLIT_PTLOCKS
fc9bb8c7	90	spinlock_t ptl;
5b99cd0e	91	#endif
fc9bb8c7 CL	92	struct kmem_cache slab; / SLUB: Pointer to slab */
fc9bb8c7 CL	93	struct page first_page; / Compound tail pages */
81819f0f	94	};
fc9bb8c7	95
5b99cd0e HC	96	/*
	97	* On machines where all RAM is mapped into kernel address space,
	98	* we can simply calculate the virtual address. On machines with
	99	* highmem some memory is mapped into kernel virtual memory
	100	* dynamically, so we need a place to store that address.
	101	* Note that this field could be 16 bits on x86 ... ;)
	102	*
	103	* Architectures with slow multiplication can define
	104	* WANT_PAGE_VIRTUAL in asm/page.h
	105	*/
	106	#if defined(WANT_PAGE_VIRTUAL)
	107	void virtual; / Kernel virtual address (NULL if
	108	not kmapped, ie. highmem) */
	109	#endif /* WANT_PAGE_VIRTUAL */
ee3b4290 AM	110	#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
	111	unsigned long debug_flags; /* Use atomic bitops on this */
	112	#endif
dfec072e VN	113
	114	#ifdef CONFIG_KMEMCHECK
	115	/*
	116	* kmemcheck wants to track the status of each byte in a page; this
	117	* is a pointer to such a status block. NULL if not tracked.
	118	*/
	119	void *shadow;
	120	#endif
fc9bb8c7 CL	121	}
	122	/*
	123	* If another subsystem starts using the double word pairing for atomic
	124	* operations on struct page then it must change the #if to ensure
	125	* proper alignment of the page struct.
	126	*/
	127	#if defined(CONFIG_SLUB) && defined(CONFIG_CMPXCHG_LOCAL)
	128	__attribute__((__aligned__(2*sizeof(unsigned long))))
	129	#endif
	130	;
5b99cd0e	131
ca16d140 KM	132	typedef unsigned long __nocast vm_flags_t;
ca16d140 KM	133
8feae131 DH	134	/*
	135	* A region containing a mapping of a non-memory backed file under NOMMU
	136	* conditions. These are held in a global tree and are pinned by the VMAs that
	137	* map parts of them.
	138	*/
	139	struct vm_region {
	140	struct rb_node vm_rb; /* link in global region tree */
ca16d140	141	vm_flags_t vm_flags; /* VMA vm_flags */
8feae131 DH	142	unsigned long vm_start; /* start address of region */
8feae131 DH	143	unsigned long vm_end; /* region initialised to here */
dd8632a1	144	unsigned long vm_top; /* region allocated to here */
8feae131 DH	145	unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */
	146	struct file vm_file; / the backing file or NULL */
	147
1e2ae599	148	int vm_usage; /* region usage count (access under nommu_region_sem) */
cfe79c00 MF	149	bool vm_icache_flushed : 1; /* true if the icache has been flushed for
cfe79c00 MF	150	* this region */
8feae131 DH	151	};
8feae131 DH	152
c92ff1bd MS	153	/*
	154	* This struct defines a memory VMM memory area. There is one of these
	155	* per VM-area/task. A VM area is any part of the process virtual memory
	156	* space that has a special rule for the page-fault handlers (ie a shared
	157	* library, the executable area etc).
	158	*/
	159	struct vm_area_struct {
	160	struct mm_struct * vm_mm; /* The address space we belong to. */
	161	unsigned long vm_start; /* Our start address within vm_mm. */
	162	unsigned long vm_end; /* The first byte after our end address
	163	within vm_mm. */
	164
	165	/* linked list of VM areas per task, sorted by address */
297c5eee	166	struct vm_area_struct vm_next, vm_prev;
c92ff1bd MS	167
c92ff1bd MS	168	pgprot_t vm_page_prot; /* Access permissions of this VMA. */
605d9288	169	unsigned long vm_flags; /* Flags, see mm.h. */
c92ff1bd MS	170
	171	struct rb_node vm_rb;
	172
	173	/*
	174	* For areas with an address space and backing store,
	175	* linkage into the address_space->i_mmap prio tree, or
	176	* linkage to the list of like vmas hanging off its node, or
	177	* linkage of vma in the address_space->i_mmap_nonlinear list.
	178	*/
	179	union {
	180	struct {
	181	struct list_head list;
	182	void parent; / aligns with prio_tree_node parent */
	183	struct vm_area_struct *head;
	184	} vm_set;
	185
	186	struct raw_prio_tree_node prio_tree_node;
	187	} shared;
	188
	189	/*
	190	* A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
	191	* list, after a COW of one of the file pages. A MAP_SHARED vma
	192	* can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
	193	* or brk vma (with NULL file) can only be in an anon_vma list.
	194	*/
5beb4930 RR	195	struct list_head anon_vma_chain; /* Serialized by mmap_sem &
5beb4930 RR	196	* page_table_lock */
c92ff1bd MS	197	struct anon_vma anon_vma; / Serialized by page_table_lock */
	198
	199	/* Function pointers to deal with this struct. */
f0f37e2f	200	const struct vm_operations_struct *vm_ops;
c92ff1bd MS	201
	202	/* Information about our backing store: */
	203	unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
	204	units, not PAGE_CACHE_SIZE */
	205	struct file * vm_file; /* File we map to (can be NULL). */
	206	void * vm_private_data; /* was vm_pte (shared mem) */
c92ff1bd MS	207
c92ff1bd MS	208	#ifndef CONFIG_MMU
8feae131	209	struct vm_region vm_region; / NOMMU mapping region */
c92ff1bd MS	210	#endif
	211	#ifdef CONFIG_NUMA
	212	struct mempolicy vm_policy; / NUMA policy for the VMA */
	213	#endif
	214	};
	215
b564daf8 ON	216	struct core_thread {
	217	struct task_struct *task;
	218	struct core_thread *next;
	219	};
	220
32ecb1f2	221	struct core_state {
c5f1cc8c	222	atomic_t nr_threads;
b564daf8	223	struct core_thread dumper;
32ecb1f2 ON	224	struct completion startup;
	225	};
	226
d559db08 KH	227	enum {
	228	MM_FILEPAGES,
	229	MM_ANONPAGES,
b084d435	230	MM_SWAPENTS,
d559db08 KH	231	NR_MM_COUNTERS
	232	};
	233
53bddb4e	234	#if USE_SPLIT_PTLOCKS && defined(CONFIG_MMU)
34e55232	235	#define SPLIT_RSS_COUNTING
34e55232 KH	236	/* per-thread cached information, */
	237	struct task_rss_stat {
	238	int events; /* for synchronization threshold */
	239	int count[NR_MM_COUNTERS];
	240	};
172703b0 MF	241	#endif /* USE_SPLIT_PTLOCKS */
172703b0 MF	242
d559db08	243	struct mm_rss_stat {
172703b0	244	atomic_long_t count[NR_MM_COUNTERS];
d559db08	245	};
d559db08	246
c92ff1bd MS	247	struct mm_struct {
	248	struct vm_area_struct * mmap; /* list of VMAs */
	249	struct rb_root mm_rb;
	250	struct vm_area_struct * mmap_cache; /* last find_vma result */
efc1a3b1	251	#ifdef CONFIG_MMU
c92ff1bd MS	252	unsigned long (get_unmapped_area) (struct file filp,
	253	unsigned long addr, unsigned long len,
	254	unsigned long pgoff, unsigned long flags);
	255	void (unmap_area) (struct mm_struct mm, unsigned long addr);
efc1a3b1	256	#endif
c92ff1bd MS	257	unsigned long mmap_base; /* base of mmap area */
	258	unsigned long task_size; /* size of task vm space */
	259	unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
	260	unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
	261	pgd_t * pgd;
	262	atomic_t mm_users; /* How many users with user space? */
	263	atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
	264	int map_count; /* number of VMAs */
481b4bb5	265
c92ff1bd	266	spinlock_t page_table_lock; /* Protects page tables and some counters */
481b4bb5	267	struct rw_semaphore mmap_sem;
c92ff1bd MS	268
	269	struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
	270	* together off init_mm.mmlist, and are protected
	271	* by mmlist_lock
	272	*/
	273
c92ff1bd MS	274
	275	unsigned long hiwater_rss; /* High-watermark of RSS usage */
	276	unsigned long hiwater_vm; /* High-water virtual memory usage */
	277
	278	unsigned long total_vm, locked_vm, shared_vm, exec_vm;
	279	unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
	280	unsigned long start_code, end_code, start_data, end_data;
	281	unsigned long start_brk, brk, start_stack;
	282	unsigned long arg_start, arg_end, env_start, env_end;
	283
	284	unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
	285
d559db08 KH	286	/*
	287	* Special counters, in some configurations protected by the
	288	* page_table_lock, in other configurations by being atomic.
	289	*/
	290	struct mm_rss_stat rss_stat;
	291
801460d0 HS	292	struct linux_binfmt *binfmt;
801460d0 HS	293
6345d24d LT	294	cpumask_var_t cpu_vm_mask_var;
6345d24d LT	295
c92ff1bd MS	296	/* Architecture-specific MM context */
	297	mm_context_t context;
	298
	299	/* Swap token stuff */
	300	/*
	301	* Last value of global fault stamp as seen by this process.
	302	* In other words, this value gives an indication of how long
	303	* it has been since this task got the token.
	304	* Look at mm/thrash.c
	305	*/
	306	unsigned int faultstamp;
	307	unsigned int token_priority;
	308	unsigned int last_interval;
	309
481b4bb5 RK	310	/* How many tasks sharing this mm are OOM_DISABLE */
	311	atomic_t oom_disable_count;
	312
c92ff1bd MS	313	unsigned long flags; /* Must use atomic bitops to access the bits */
c92ff1bd MS	314
a94e2d40	315	struct core_state core_state; / coredumping support */
858f0993	316	#ifdef CONFIG_AIO
abf137dd JA	317	spinlock_t ioctx_lock;
abf137dd JA	318	struct hlist_head ioctx_list;
858f0993	319	#endif
cf475ad2	320	#ifdef CONFIG_MM_OWNER
4cd1a8fc KM	321	/*
	322	* "owner" points to a task that is regarded as the canonical
	323	* user/owner of this mm. All of the following must be true in
	324	* order for it to be changed:
	325	*
	326	* current == mm->owner
	327	* current->mm != mm
	328	* new_owner->mm == mm
	329	* new_owner->alloc_lock is held
	330	*/
4d2deb40	331	struct task_struct __rcu *owner;
78fb7466	332	#endif
925d1c40	333
925d1c40 MH	334	/* store ref to file /proc/<pid>/exe symlink points to */
	335	struct file *exe_file;
	336	unsigned long num_exe_file_vmas;
cddb8a5c AA	337	#ifdef CONFIG_MMU_NOTIFIER
cddb8a5c AA	338	struct mmu_notifier_mm *mmu_notifier_mm;
e7a00c45 AA	339	#endif
	340	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	341	pgtable_t pmd_huge_pte; /* protected by page_table_lock */
cddb8a5c	342	#endif
6345d24d LT	343	#ifdef CONFIG_CPUMASK_OFFSTACK
	344	struct cpumask cpumask_allocation;
	345	#endif
c92ff1bd MS	346	};
c92ff1bd MS	347
6345d24d LT	348	static inline void mm_init_cpumask(struct mm_struct *mm)
	349	{
	350	#ifdef CONFIG_CPUMASK_OFFSTACK
	351	mm->cpu_vm_mask_var = &mm->cpumask_allocation;
	352	#endif
	353	}
	354
45e575ab	355	/* Future-safe accessor for struct mm_struct's cpu_vm_mask. */
de03c72c KM	356	static inline cpumask_t mm_cpumask(struct mm_struct mm)
	357	{
	358	return mm->cpu_vm_mask_var;
	359	}
45e575ab	360
5b99cd0e	361	#endif /* _LINUX_MM_TYPES_H */