5.110 BCC工具之btrfsslower.py解读

一，工具简介

btrfsslower 显示慢于阈值的 btrfs 读取、写入、打开和同步操作

二，代码示例

#!/usr/bin/env python

from __future__ import print_function
from bcc import BPF
import argparse
from datetime import datetime, timedelta
from time import strftime

# symbols
kallsyms = "/proc/kallsyms"

# arguments
examples = """examples:
    ./btrfsslower             # trace operations slower than 10 ms (default)
    ./btrfsslower 1           # trace operations slower than 1 ms
    ./btrfsslower -j 1        # ... 1 ms, parsable output (csv)
    ./btrfsslower 0           # trace all operations (warning: verbose)
    ./btrfsslower -p 185      # trace PID 185 only
    ./btrfsslower -d 10       # trace for 10 seconds only
"""
parser = argparse.ArgumentParser(
    description="Trace common btrfs file operations slower than a threshold",
    formatter_class=argparse.RawDescriptionHelpFormatter,
    epilog=exa