Assignment 7, 8

[jimin-kiim]

Assignment 7: Profiling inside the kernel

• added calclock.h, calclock.c
• added fio script
• used calclock in pxt4_file_write_iter() function to measure the execution time
• made it print out the profiling result inside pxt4_exit_fs() function
• modified Makefile
• used it for profiling test
  • built pxt4 module
  • mounted the testing device with pxt4
  • run fio test
  • unmounted the device
  • removed pxt4 module
  • used dmesg command to check the profiling result

Assignment 8: Checking CPU utilization

• used ds_monitoring to check how many time pxt4_file_write_iter() have been called from each CPU
  • added ds_monitoring.h, ds_monitoring.c
  • (added current.h)
    • to get current cpu id in more simple way
  • used find_ds_monitoring() inside pxt4_file_write_iter()
  • used print_ds_monitoring() and delete_ds_monitoring() inside pxt4_exit_fs()
  • modified Makefile
  • used it for checking CPU utilization
    • built pxt4 module
    • mounted the testing device with pxt4
    • run fio test
    • unmounted the device
    • removed pxt4 module
    • used dmesg command to check the profiling result