5.117 BCC工具之xfsdist.py解读

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一，工具简介

xfsdist 追踪 XFS 的读取、写入、打开和 fsyncs 操作，并将其延迟以 2 的幂次直方图的形式进行总结。例如：

二，代码示例

#!/usr/bin/env pythonfrom __future__ import print_function
from bcc import BPF
from time import sleep, strftime
import argparse# arguments
examples = """examples:./xfsdist            # show operation latency as a histogram./xfsdist -p 181     # trace PID 181 only./xfsdist 1 10       # print 1 second summaries, 10 times./xfsdist -m 5       # 5s summaries, milliseconds
"""
parser = argparse.ArgumentParser(description="Summarize XFS operation latency",formatter_class=argparse.RawDescriptionHelpFormatter,epilog=examples)
parser.add_argument("-T", "--notimestamp", action="store_true",help="don't include timestamp on interval output")
parser.add_argument("-m", "--milliseconds", action="sto

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