| #!/usr/bin/python |
| # |
| # bitehist.py Block I/O size histogram. |
| # For Linux, uses BCC, eBPF. See .c file. |
| # |
| # Written as a basic example of using a histogram to show a distribution. |
| # |
| # The default interval is 5 seconds. A Ctrl-C will print the partially |
| # gathered histogram then exit. |
| # |
| # Copyright (c) 2015 Brendan Gregg. |
| # Licensed under the Apache License, Version 2.0 (the "License") |
| # |
| # 15-Aug-2015 Brendan Gregg Created this. |
| |
| from bcc import BPF |
| from time import sleep |
| |
| # load BPF program |
| b = BPF(src_file = "bitehist.c") |
| b.attach_kprobe(event="blk_start_request", fn_name="do_request") |
| |
| # header |
| print("Tracing... Hit Ctrl-C to end.") |
| |
| # output |
| try: |
| sleep(99999999) |
| except KeyboardInterrupt: |
| print |
| |
| b["dist"].print_log2_hist() |
| b["dist"].clear() |