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#!/usr/bin/python
# @lint-avoid-python-3-compatibility-imports
#
# 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.
#
# Copyright (c) 2015 Brendan Gregg.
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 13-Aug-2015 Brendan Gregg Created this.
# 19-Feb-2016 Allan McAleavy migrated to BPF_PERF_OUTPUT
from __future__ import print_function
from bcc import BPF
import sys
# load BPF program
b = BPF(text="""
struct data_t {
u64 ts;
};
BPF_PERF_OUTPUT(events);
void syscall__sync(void *ctx) {
struct data_t data = {};
data.ts = bpf_ktime_get_ns() / 1000;
events.perf_submit(ctx, &data, sizeof(data));
};
""")
b.attach_kprobe(event=b.get_syscall_fnname("sync"),
fn_name="syscall__sync")
# header
print("%-18s %s" % ("TIME(s)", "CALL"))
# process event
def print_event(cpu, data, size):
event = b["events"].event(data)
print("%-18.9f sync()" % (float(event.ts) / 1000000))
sys.stdout.flush()
# loop with callback to print_event
b["events"].open_perf_buffer(print_event)
while 1:
try:
b.perf_buffer_poll()
except KeyboardInterrupt:
exit()
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