5.23 BCC工具之drsnoop.py解读

一，工具简介

drsnoop是一个内存工具，它追踪全系统内存的direct reclaim（直接回收）操作，并打印出各种详细信息。

二，代码示例

#!/usr/bin/env python
 
from __future__ import print_function
from bcc import ArgString, BPF
import argparse
from datetime import datetime, timedelta
import os
import math
import sys
 
#符号
kallsyms = "/proc/kallsyms"
 
#参数
examples = """examples:
    ./drsnoop           # trace all direct reclaim
    ./drsnoop -T        # include timestamps
    ./drsnoop -U        # include UID
    ./drsnoop -P 181    # only trace PID 181
    ./drsnoop -t 123    # only trace TID 123
    ./drsnoop -u 1000   # only trace UID 1000
    ./drsnoop -d 10     # trace for 10 seconds only
    ./drsnoop -n main   # only print process names containing "main"
"""
parser = argparse.ArgumentParser(
    description="Trace direct reclaim",
    formatter_class=argparse.RawDescriptionHelpFormatter,
    epi