#!/usr/bin/python
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# @lint-avoid-python-3-compatibility-imports
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#
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# syncsnoop Trace sync() syscall.
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# For Linux, uses BCC, eBPF. Embedded C.
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#
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# Written as a basic example of BCC trace & reformat. See
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# examples/hello_world.py for a BCC trace with default output example.
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#
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# Copyright (c) 2015 Brendan Gregg.
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# Licensed under the Apache License, Version 2.0 (the "License")
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#
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# 13-Aug-2015 Brendan Gregg Created this.
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# 19-Feb-2016 Allan McAleavy migrated to BPF_PERF_OUTPUT
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from __future__ import print_function
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from bcc import BPF
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import ctypes as ct
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# load BPF program
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b = BPF(text="""
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struct data_t {
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u64 ts;
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};
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BPF_PERF_OUTPUT(events);
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void syscall__sync(void *ctx) {
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struct data_t data = {};
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data.ts = bpf_ktime_get_ns() / 1000;
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events.perf_submit(ctx, &data, sizeof(data));
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};
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""")
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b.attach_kprobe(event=b.get_syscall_fnname("sync"),
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fn_name="syscall__sync")
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class Data(ct.Structure):
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_fields_ = [
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("ts", ct.c_ulonglong)
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]
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# header
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print("%-18s %s" % ("TIME(s)", "CALL"))
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# process event
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def print_event(cpu, data, size):
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event = ct.cast(data, ct.POINTER(Data)).contents
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print("%-18.9f sync()" % (float(event.ts) / 1000000))
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# loop with callback to print_event
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b["events"].open_perf_buffer(print_event)
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while 1:
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b.perf_buffer_poll()
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