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 15from __future__ import print_function 16from bcc import BPF 17 18# load BPF program 19b = BPF(text=""" 20void kprobe__sys_sync(void *ctx) { 21 bpf_trace_printk("sync()\\n"); 22}; 23""") 24 25# header 26print("%-18s %s" % ("TIME(s)", "CALL")) 27 28# format output 29while 1: 30 (task, pid, cpu, flags, ts, msg) = b.trace_fields() 31 print("%-18.9f %s" % (ts, msg)) 32