1 #!/usr/bin/python 2 # @lint-avoid-python-3-compatibility-imports 3 # 4 # syncsnoop Trace sync() syscall. 5 # For Linux, uses BCC, eBPF. Embedded C. 6 # 7 # Written as a basic example of BCC trace & reformat. See 8 # examples/hello_world.py for a BCC trace with default output example. 9 # 10 # Copyright (c) 2015 Brendan Gregg. 11 # Licensed under the Apache License, Version 2.0 (the "License") 12 # 13 # 13-Aug-2015 Brendan Gregg Created this. 14 15 from __future__ import print_function 16 from bcc import BPF 17 18 # load BPF program 19 b = BPF(text=""" 20 void kprobe__sys_sync(void *ctx) { 21 bpf_trace_printk("sync()\\n"); 22 }; 23 """) 24 25 # header 26 print("%-18s %s" % ("TIME(s)", "CALL")) 27 28 # format output 29 while 1: 30 (task, pid, cpu, flags, ts, msg) = b.trace_fields() 31 print("%-18.9f %s" % (ts, msg)) 32
