制作火焰图（纯笔记）

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：

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;
}

<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 &gt; 
/home/yejianfeng/ngx.out&nbsp;
<P>WARNING: never-assigned local variable 'exit' (alternatives: i s quit): 
identifier 'exit' at /home/yejianfeng/handcode/ngx.stp:10:4
<P>&nbsp;source: exit;
<P>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ^
<P>WARNING: Eliding side-effect-free expression : identifier 'exit' at :10:4
<P>&nbsp;source: exit;
<P>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ^
<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. &nbsp;Try again with another '--vp 00001' option.</P>

 

 

纯笔记。。。搞了半天没搞出来。。。MMD。。。水平太搓了。。。