安装systemtap
按照官网说的安装：http://sourceware.org/systemtap/wiki/SystemTapOnCentOS
我的操作系统是centos
uname -rm:
2.6.18-164.el5xen x86_64
yum install systemtap
wget http://debuginfo.centos.org/5/x86_64/kernel-debuginfo-2.6.18-164.el5.x86_64.rpm
wget http://debuginfo.centos.org/5/x86_64/kernel-debuginfo-common-2.6.18-164.el5.x86_64.rpm
[root@test34x-nova ~/software]# rpm -Uhv kernel-debuginfo-*rpm
warning: kernel-debuginfo-2.6.18-164.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID e8562897
Preparing... ########################################### [100%]
1:kernel-debuginfo-common########################################### [ 50%]
2:kernel-debuginfo ########################################### [100%]
测试是否安装成功
stap -ve 'probe begin { log("hello world") exit() }'
提示：
Checking "/lib/modules/2.6.32-279.el6.x86_64/build/.config" failed with error: 没有那个文件或目录
Incorrect version or missing kernel-devel package, use: yum install kernel-devel-2.6.32-279.el6.x86_64
下载Flame Graph
https://github.com/brendangregg/FlameGraph
比如我放在这个目录里：
/home/yejianfeng/software/FlameGraph-master
下面拿nginx的一个模块来进行测试
http://www.cnblogs.com/yjf512/archive/2013/06/13/3133569.html
这里有个自己写的mysecret2的模块
安装配置好，确保能访问
写一个systemtrap脚本：
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global
s;
global
quit = 0;
probe timer.profile {
if
(pid() == target()) {
if
(quit) {
foreach
(i in s-) {
print_ustack(i);
printf(
"\t%d\n"
, @
count
(s[i]));
}
exit
;
}
else
{
s[ubacktrace()] <<< 1;
}
}
}
probe timer.s(20) {
quit = 1;
}
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<P>[root@test34x-nova ~/handcode]# stap --ldd -d
/home/yejianfeng/nginx/nginx/sbin/nginx --all-modules -D MAXMAPENTRIES=256 -D
MAXACTION=20000 -D MAXTRACE=100 -D MAXSTRINGLEN=4096 -D MAXBACKTRACE=100 -x
26150 /home/yejianfeng/handcode/ngx.stp --vp 0001 >
/home/yejianfeng/ngx.out
<P>WARNING: never-assigned local variable
'exit'
(alternatives: i s quit):
identifier
'exit'
at /home/yejianfeng/handcode/ngx.stp:10:4
<P> source:
exit
;
<P> ^
<P>WARNING: Eliding side-effect-free expression : identifier
'exit'
at :10:4
<P> source:
exit
;
<P> ^
<P>WARNING: missing unwind/symbol data
for
module
'kernel'
<P>WARNING: missing unwind/symbol data
for
module
'uprobes'
<P>Pass 4: compiled C into
"stap_7ee66ba3cf5480d819b30e4f49bf3bb1_3633.ko"
in
5560usr/1320sys/9525real ms.
<P>WARNING: /usr/bin/staprun exited with status: 1
<P>Pass 5: run failed. Try again with another
'--vp 00001'
option.</P>
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纯笔记。。。搞了半天没搞出来。。。MMD。。。水平太搓了。。。
本文转自轩脉刃博客园博客，原文链接：http://www.cnblogs.com/yjf512/p/3374014.html，如需转载请自行联系原作者
