1. components
   1. kernel
      1. components
         1. process
            1. components
            2. classfication
         2. memory
            1. components
            2. Address space
            3. Page table
            4. classfication
            5. multi-level page table
            6. Page
            7. MMU
            8. TLB
            9. The buddy system
            10. Slab allocator
            11. classfication
            12. operation
            13. Memory mapping
         3. FS
            1. components
            2. VFS
            3. classfication
            4. tmpfs
            5. ramfs
            6. inode
            7. file
            8. components
            9. f_op
         4. device & driver
            1. components
            2. device
            3. classfication
            4. block devices
            5. components
            6. sector
            7. block
            8. request queue management
            9. Character devices
            10. Network devices
            11. device file
            12. components
            13. /dev
            14. udevd
            15. Ioctl
            16. major minor number
            17. device model
            18. classification
            19. kobject
            20. data & struct
            21. kobj_map
            22. char_device_struct
            23. cdev
            24. components
            25. ops
            26. genhd
            27. bdev_inode
            28. block_device
            29. gendisk
            30. hd_struct
            31. request_queue
            32. request
            33. bio
            34. bio_vec
            35. elevator_ops
            36. resource
            37. device
            38. device_driver
            39. bus_type
            40. I/O Memory
            41. I/O port
            42. buses system
            43. classfication
            44. system bus
            45. classfication
            46. pci
            47. isa
            48. extension bus
            49. classfication
            50. usb
            51. operation
            52. register device
            53. add_disk
            54. add_partition
            55. Subtopic 2
            56. open device file
            57. def_chr_fops
            58. chrdev_open
            59. fops_get
            60. memory_fops
            61. mem_fops
            62. kmem_fops
            63. null_fops
            64. random_fops
            65. other
            66. def_blk_fops
            67. blkdev_open
            68. blkdev_get
            69. bio
            70. submit_bio
            71. generic_make_request
            72. make_request_fn
            73. blk_queue_bio
         5. system call
         6. timming
         7. net
         8. module
         9. caching
2. operation
   1. I/O
      1. classfication
         1. Port-mapped I/O
         2. Memory-mapped I/O
3. operation
4. components
5. classfication