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#关键脚本stapxx/samples/ngx-lua-exec-time.sxx中第58行@pfunc(ngx_http_lua_free_fake_request)函数找不到的问题：
2> sudo ./samples/ngx-lua-exec-time.sxx -x 11070
semantic error: while resolving probe point: identifier 'process' at <input>:58:7
        source:       process("/usr/local/nginx/sbin/nginx").function("ngx_http_lua_free_fake_request")
                      ^

semantic error: no match (similar functions: ngx_http_lua_get_request, ngx_http_create_request, ngx_http_free_request, ngx_http_lua_post_subrequest, ngx_http_scgi_create_request)
Pass 2: analysis failed.  [man error::pass2]

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#tegine编译选项
CFLAGS="-g -O2" ./configure  --add-module=/path/ngx_openresty-1.7.10.1/bundle/ngx_lua-0.9.15/ --with-luajit-lib=/usr/local/lib/ --with-luajit-inc=/usr/local/include/luajit-2.1/ --with-ld-opt=-Wl,-rpath,/usr/local/lib

make -j16

#新版本ngx_lua在openresty的bundle的ngx_lua-0.9.15/里，也可以从https://github.com/openresty/lua-nginx-module获得

#LuaJIT2.1的源代码也在bundle里，也可以从https://github.com/openresty/luajit2获得。

LuaJIT2.1的编译选项是：
make CCDEBUG=-g -B -j8
make -j16

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#debian系的可以使用dpkg -l linux-image*命令，查看具体内核版本；

huang@ThinkPad-X220:~$ dpkg -l linux-image*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                   Version          Architecture     Description
+++-======================-================-================-==================================================
un  linux-image            <none>           <none>           (no description available)
un  linux-image-3.0        <none>           <none>           (no description available)
ii  linux-image-3.13.0-24- 3.13.0-24.47     amd64            Linux kernel image for version 3.13.0 on 64 bit x8
ii  linux-image-3.13.0-24- 3.13.0-24.47     amd64            Linux kernel debug image for version 3.13.0 on 64 
ii  linux-image-extra-3.13 3.13.0-24.46     amd64            Linux kernel extra modules for version 3.13.0 on 6
ii  linux-image-generic    3.13.0.24.28     amd64            Generic Linux kernel image

#特别要注意的是3.13.0-24.46、 47、 48，小版本很重要的。

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2> sudo ./samples/ngx-rewrite-latency-distr.sxx -x 11070
semantic error: not accessible at this address [man error::dwarf] (0x44a53b, dieoffset: 0x13a891): identifier '$r' at <input>:67:9
        source:     r = $r
                        ^

Pass 2: analysis failed.  [man error::pass2]

# 这个r是没有问题的，在nginx-systemtap-toolkit/ngx-active-reqs中有类似定义：
my $c = '@cast(c, "ngx_connection_t")';
my $r = '@cast(r, "ngx_http_request_t")';
my $u = '@cast(u, "ngx_http_upstream_t")';
my $p = '@cast(p, "ngx_event_pipe_t")';

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$ sudo wget http://people.centos.org/tru/devtools-1.1/devtools-1.1.repo -P /etc/yum.repos.d
$ sudo sh -c 'echo "enabled=1" >> /etc/yum.repos.d/devtools-1.1.repo'
$ sudo yum install devtoolset-1.1
$ scl enable devtoolset-1.1 bash
$ gcc --version
# 通过devtoolset工具可以暂时提高gcc版本，而不更改之前服务器的配置，这个很有效果，高版本的gcc会智能保留symbol。

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# tcp包里有个flags字段表示包的类型，tcpdump可以根据该字段抓取相应类型的包：
# tcp[13] 就是 TCP flags (URG,ACK,PSH,RST,SYN,FIN)
# Unskilled 32
# Attackers 16
# Pester     8
# Real       4
# Security   2
# Folks      1

#抓取fin包：
tcpdump -ni any port 9001 and 'tcp[13] & 1 != 0 ' -s0  -w fin.cap -vvv
#抓取syn+fin包：
tcpdump -ni any port 9001 and 'tcp[13] & 3 != 0 ' -s0  -w syn_fin.cap -vvv
#抓取rst包：
tcpdump -ni any port 9001 and 'tcp[13] & 4 != 0 ' -s0  -w rst.cap -vvv

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redis-cli  -p 6379 MONITOR | head -n 100000 | ./redis-faina/redis-faina.py