Linux内核虚拟内存的管理结构说明
1 一块虚拟内存空间用该结构来表示，然后所有的虚拟地址空间块构成了一个链表。并且形成了一个AVL树。便于查找。
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4 Vm_area_struct 结构。
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6 Typedef struct tag_vm_area_struct
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8 {
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10 Struct mm_struct* mm;
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13 //决定了一个虚拟地址空间的Start和End
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15 Unsigned long vm_start;
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17 Unsigned long vm_end;
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20 //该块空间的访问属性和其他属性
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22 Pgprot_t vm_page_prot;
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24 Unsigned long vm_flags;
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27 //虚拟地址空间块的链表
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29 Struct vm_area_struct * vm_next;
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32 //虚拟地址空间块的AVL树
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34 Short vm_avl_height;
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36 Struct vm_area_struct * vm_avl_left;
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38 Struct vm_area_struct * vm_avl_right;
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41 Struct vm_operational_struct * vm_ops;
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45 Struct vm_area_struct * vm_next_share;
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47 Struct vm_area_struct * vm_pprev_share;
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51 Unsigned long vm_pgoff;
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54 Struct file * vm_file;
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57 Unsigned long vm_raend;
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60 Void * vm_private_data;
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63 }vm_area_struct;
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68 Mm_struct 结构
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71 是进程整个用户空间的抽象。
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74 Struct mm_struct
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76 {
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78 Struct vm_area_struct * mmap; //vm区域的链表头
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80 Struct vm_area_struct * mmap_avl; //vm的avl树
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82 Struct vm_area_struct * mmap_cache; //vm区域缓冲cache
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85 Pgd_t * pgd; //页面目录表
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88 Atomic_t mm_users;
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90 Atomic_t mm_count;
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94 //vm的个数
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96 Int mapcount;
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99 Struct semaphore mmap_sem;
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102 Spinlock_t page_table_lock;
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105 Stuct list_head mmlist;
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108 Unsigned long start_code, end_code, start_data, end_data;
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111 Unsigned long start_brk, brk, start_stack;
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114 Unsigned long arg_start, arg_end, env_start, env_end;
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117 Unsigned long rss, total_vm, locked_vm;
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119 Unsigned long def_flags;
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121 Unsigned long cpu_vm_mask;
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123 Unsigned long swap_cnt;
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125 Unsigned long swap_address;
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127 Mm_context_t context;
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129 };
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4 Vm_area_struct 结构。
5
6 Typedef struct tag_vm_area_struct
7
8 {
9
10 Struct mm_struct* mm;
11
12
13 //决定了一个虚拟地址空间的Start和End
14
15 Unsigned long vm_start;
16
17 Unsigned long vm_end;
18
19
20 //该块空间的访问属性和其他属性
21
22 Pgprot_t vm_page_prot;
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24 Unsigned long vm_flags;
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26
27 //虚拟地址空间块的链表
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29 Struct vm_area_struct * vm_next;
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31
32 //虚拟地址空间块的AVL树
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34 Short vm_avl_height;
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36 Struct vm_area_struct * vm_avl_left;
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38 Struct vm_area_struct * vm_avl_right;
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41 Struct vm_operational_struct * vm_ops;
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45 Struct vm_area_struct * vm_next_share;
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47 Struct vm_area_struct * vm_pprev_share;
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51 Unsigned long vm_pgoff;
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54 Struct file * vm_file;
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57 Unsigned long vm_raend;
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60 Void * vm_private_data;
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62
63 }vm_area_struct;
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68 Mm_struct 结构
69
70
71 是进程整个用户空间的抽象。
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74 Struct mm_struct
75
76 {
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78 Struct vm_area_struct * mmap; //vm区域的链表头
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80 Struct vm_area_struct * mmap_avl; //vm的avl树
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82 Struct vm_area_struct * mmap_cache; //vm区域缓冲cache
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85 Pgd_t * pgd; //页面目录表
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88 Atomic_t mm_users;
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90 Atomic_t mm_count;
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94 //vm的个数
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96 Int mapcount;
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99 Struct semaphore mmap_sem;
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102 Spinlock_t page_table_lock;
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105 Stuct list_head mmlist;
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108 Unsigned long start_code, end_code, start_data, end_data;
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111 Unsigned long start_brk, brk, start_stack;
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114 Unsigned long arg_start, arg_end, env_start, env_end;
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117 Unsigned long rss, total_vm, locked_vm;
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119 Unsigned long def_flags;
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121 Unsigned long cpu_vm_mask;
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123 Unsigned long swap_cnt;
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125 Unsigned long swap_address;
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127 Mm_context_t context;
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129 };
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