diff options
Diffstat (limited to 'include/linux/mm_types.h')
| -rw-r--r-- | include/linux/mm_types.h | 158 |
1 files changed, 147 insertions, 11 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index d5bb1796e12b..877667918452 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -1,13 +1,26 @@ #ifndef _LINUX_MM_TYPES_H #define _LINUX_MM_TYPES_H +#include <linux/auxvec.h> /* For AT_VECTOR_SIZE */ #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 <asm/page.h> +#include <asm/mmu.h> struct address_space; +#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS +typedef atomic_long_t mm_counter_t; +#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ +typedef unsigned long mm_counter_t; +#endif /* 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 @@ -24,10 +37,7 @@ struct page { * to show when page is mapped * & limit reverse map searches. */ - struct { /* SLUB uses */ - short unsigned int inuse; - short unsigned int offset; - }; + unsigned int inuse; /* SLUB: Nr of objects */ }; union { struct { @@ -49,13 +59,8 @@ struct page { #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS spinlock_t ptl; #endif - struct { /* SLUB uses */ - void **lockless_freelist; - struct kmem_cache *slab; /* Pointer to slab */ - }; - struct { - struct page *first_page; /* Compound pages */ - }; + struct kmem_cache *slab; /* SLUB: Pointer to slab */ + struct page *first_page; /* Compound tail pages */ }; union { pgoff_t index; /* Our offset within mapping. */ @@ -80,4 +85,135 @@ struct page { #endif /* WANT_PAGE_VIRTUAL */ }; +/* + * 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; + + pgprot_t vm_page_prot; /* Access permissions of this VMA. */ + unsigned long vm_flags; /* Flags, listed below. */ + + 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_node; /* Serialized by anon_vma->lock */ + struct anon_vma *anon_vma; /* Serialized by page_table_lock */ + + /* Function pointers to deal with this struct. */ + 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) */ + unsigned long vm_truncate_count;/* truncate_count or restart_addr */ + +#ifndef CONFIG_MMU + atomic_t vm_usage; /* refcount (VMAs shared if !MMU) */ +#endif +#ifdef CONFIG_NUMA + struct mempolicy *vm_policy; /* NUMA policy for the VMA */ +#endif +}; + +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 */ + 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); + 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 */ + struct rw_semaphore mmap_sem; + spinlock_t page_table_lock; /* Protects page tables and some counters */ + + 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 + */ + + /* Special counters, in some configurations protected by the + * page_table_lock, in other configurations by being atomic. + */ + mm_counter_t _file_rss; + mm_counter_t _anon_rss; + + 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 */ + + cpumask_t cpu_vm_mask; + + /* 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; + + unsigned long flags; /* Must use atomic bitops to access the bits */ + + /* coredumping support */ + int core_waiters; + struct completion *core_startup_done, core_done; + + /* aio bits */ + rwlock_t ioctx_list_lock; + struct kioctx *ioctx_list; +}; + #endif /* _LINUX_MM_TYPES_H */ |