虽然很早以前听说过,但基本没用过,最近褚霸同学的介绍,勾起了我对这个东西的兴趣。最近在工作笔记本上装了个Ubuntu10.10做为主操作系统,因此正好在上面也实验学习下SystemTap。
安装systemtap
sudo apt-get install systemtap
Ubuntu Desktop默认没有安装kernel debug info的包,systemtap无法追踪内核信息。查看内核版本
ningoo@ning:~/stap$ uname -r 2.6.35-22-generic
从这里下载对应的kernel debug info包,安装
sudo dpkg -i linux-image-2.6.35-22-generic-dbgsym_2.6.35-22.35_i386.ddeb
至此内核追踪已经可以执行,但module的信息还需要多做些工作
sudo apt-get install elfutils for file in `find /usr/lib/debug -name '*.ko' -print` do buildid=`eu-readelf -n $file| grep Build.ID: | awk '{print $3}'` dir=`echo $buildid | cut -c1-2` fn=`echo $buildid | cut -c3-` mkdir -p /usr/lib/debug/.build-id/$dir ln -s $file /usr/lib/debug/.build-id/$dir/$fn ln -s $file /usr/lib/debug/.build-id/$dir/${fn}.debug done
Hello world
ningoo@ning:~/stap$ sudo stap -ve 'probe begin { log("hello world") exit() }' Pass 1: parsed user script and 72 library script(s) using 18896virt/12868res/1880shr kb, in 130usr/20sys/150real ms. Pass 2: analyzed script: 1 probe(s), 2 function(s), 0 embed(s), 0 global(s) using 19160virt/13132res/1908shr kb, in 10usr/0sys/5real ms. Pass 3: using cached /home/ningoo/.systemtap/cache /f1/stap_f10ab2aeba4f2da2c03646b27b4d3627_757.c Pass 4: using cached /home/ningoo/.systemtap/cache /f1/stap_f10ab2aeba4f2da2c03646b27b4d3627_757.ko Pass 5: starting run. hello world Pass 5: run completed in 0usr/30sys/297real ms.