bcc/tools/syncsnoop at p4-demo · devel-hm/bcc

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#!/usr/bin/python

# syncsnoop Trace sync() syscall.

# For Linux, uses BCC, eBPF. Embedded C.

# Written as a basic example of BCC trace & reformat. See

# examples/hello_world.py for a BCC trace with default output example.

# Licensed under the Apache License, Version 2.0 (the "License")

# 13-Aug-2015 Brendan Gregg Created this.

from __future__ import print_function

from bcc import BPF

# load BPF program

b = BPF(text = """

void kprobe__sys_sync(void *ctx) {

bpf_trace_printk("sync()\\n");

};

""")

# header

print("%-18s %s" % ("TIME(s)", "CALL"))

# format output

while 1:

(task, pid, cpu, flags, ts, msg) = b.trace_fields()

print("%-18.9f %s" % (ts, msg))