centos7下systemtap 介紹

centos7下systemtap 介紹

0. 查看環境：

# uname -aLinux hw005 3.10.0-327.10.1.el7.x86_64 #1 SMP Tue Feb 16 17:03:50 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

1. yum install kernel-devel

2. yum install systemtap

3. install kernel/glib debug:

glibc-debuginfo-2.17-106.el7_2.4.x86_64.rpmglibc-debuginfo-common-2.17-106.el7_2.4.x86_64.rpmkernel-debuginfo-3.10.0-327.10.1.el7.x86_64.rpmkernel-debuginfo-common-x86_64-3.10.0-327.10.1.el7.x86_64.rpm

ref:http://debuginfo.centos.org/7

4. 測試是否安裝ok：

# # 測試stap# stap -VSystemtap translator/driver (version 2.8/0.163, rpm 2.8-10.el7)Copyright (C) 2005-2015 Red Hat, Inc. and othersThis is free software; see the source for copying conditions.enabled features: AVAHI LIBRPM LIBSQLITE3 NSS BOOST_SHARED_PTR TR1_UNORDERED_MAP NLS DYNINST JAVA LIBVIRT LIBXML2## # 測試kernel-debuginfo# stap -L  'kernel.function("printk")'kernel.function("printk@kernel/printk.c:1693") $fmt:char const* $args:va_list# # # 測試glibc-debuginfo# stap -L  'process("/lib64/libc.so.6").function("malloc")'process("/usr/lib64/libc-2.17.so").function("malloc"

5. 一個測試例子：查找內存洩露

# # C 源文件：# cat t.c#include <stdlib.h>void fun() {    malloc(1000);}int main(int argc, char *argv[]) {    fun();    return 0;}## # systemtap 腳本：# cat m.stp probe process("/lib64/libc.so.6").function("malloc") {    if (target()== pid()) {        print_ubacktrace();        exit();    }}probe begin {    println("~");}## # 編譯t.cat：# gcc -g t.c## # 查看 a.out 的函數調用棧：# stap -L 'process("./a.out").function("*")'process("/root/systemtap/test/a.out").function("__do_global_dtors_aux")process("/root/systemtap/test/a.out").function("__libc_csu_fini")process("/root/systemtap/test/a.out").function("__libc_csu_init")process("/root/systemtap/test/a.out").function("_fini")process("/root/systemtap/test/a.out").function("_init")process("/root/systemtap/test/a.out").function("_start")process("/root/systemtap/test/a.out").function("deregister_tm_clones")process("/root/systemtap/test/a.out").function("frame_dummy")process("/root/systemtap/test/a.out").function("fun@/root/systemtap/test/t.c:3")process("/root/systemtap/test/a.out").function("main@/root/systemtap/test/t.c:7") $argc:int $argv:char**process("/root/systemtap/test/a.out").function("register_tm_clones")## # 查看 malloc 調用情況：# stap m.stp -c ./a.out ~ 0x7fed3b435890 : __libc_malloc+0x0/0xe0 [/usr/lib64/libc-2.17.so] 0x40053e [/root/systemtap/test/a.out+0x53e/0x1000]WARNING: Missing unwind data for module, rerun with 'stap -d /root/systemtap/test/a.out'## # 查看調用 malloc 的代碼# addr2line ./a.out 0x40053e??:0/root/systemtap/test/t.c:5

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