41struct vm_area_struct {
42 struct mm_struct * vm_mm; /* VM area parameters */ ===================================> 设置为新申请的 mm
43 unsigned long vm_start;
44 unsigned long vm_end;
45
46 /* linked list of VM areas per task, sorted by address */
47 struct vm_area_struct *vm_next; ============================================================> NULL
48
49 pgprot_t vm_page_prot;
50 unsigned long vm_flags; ==============================================================> 清除 VM_LOCKED 标志
51
52 /* AVL tree of VM areas per task, sorted by address */
53 short vm_avl_height; ===============================> 垃圾值
54 struct vm_area_struct * vm_avl_left; ========================> 但没关系， 因为 mm->mmap_avl 在进入函数时就设置为了NULL
55 struct vm_area_struct * vm_avl_right;========================> 而在 build_avl_tree 时， 这些值又会被更新
56
57 /* For areas with an address space and backing store,
58 * one of the address_space->i_mmap{,shared} lists,
59 * for shm areas, the list of attaches, otherwise unused.
60 */
61 struct vm_area_struct *vm_next_share; ===================================================> 插入到父任务
62 struct vm_area_struct **vm_pprev_share; ===================================================> vm_area_struct 之后
63
64 struct vm_operations_struct * vm_ops;
65 unsigned long vm_pgoff; /* offset in PAGE_SIZE units, *not* PAGE_CACHE_SIZE */
66 struct file * vm_file;
67 unsigned long vm_raend;
68 void * vm_private_data; /* was vm_pte (shared mem) */
69};
70