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Copy pathtest_tracepoint.py
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executable file
·43 lines (39 loc) · 1.19 KB
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#!/usr/bin/env python
# Copyright (c) Sasha Goldshtein
# Licensed under the Apache License, Version 2.0 (the "License")
import bcc
import unittest
from time import sleep
import distutils.version
import os
def kernel_version_ge(major, minor):
# True if running kernel is >= X.Y
version = distutils.version.LooseVersion(os.uname()[2]).version
if version[0] > major:
return True
if version[0] < major:
return False
if minor and version[1] < minor:
return False
return True
@unittest.skipUnless(kernel_version_ge(4,7), "requires kernel >= 4.7")
class TestTracepoint(unittest.TestCase):
def test_tracepoint(self):
text = """
BPF_HASH(switches, u32, u64);
TRACEPOINT_PROBE(sched, sched_switch) {
u64 val = 0;
u32 pid = args->next_pid;
u64 *existing = switches.lookup_or_init(&pid, &val);
(*existing)++;
return 0;
}
"""
b = bcc.BPF(text=text)
sleep(1)
total_switches = 0
for k, v in b["switches"].items():
total_switches += v.value
self.assertNotEqual(0, total_switches)
if __name__ == "__main__":
unittest.main()