Ubuntu 11.10 (Oneiric)下编译带utrace补丁的内核

Ubuntu 11.10 (Oneiric)上编译带utrace补丁的内核
首先准备linux内核编译环境：

sudo apt-get install fakeroot build-essential crash kexec-tools makedumpfile kernel-wedge kernel-packagesudo apt-get build-dep linuxsudo apt-get install git-core libncurses5 libncurses5-dev libelf-dev asciidoc binutils-dev

检出带有utrace补丁的官方内核代码，并生成对应Ubuntu当前版本内核（3.0）的补丁：

git clone https://github.com/utrace/linux.git utrace-linux-gitcd utrace-linux-git/git checkout -b utrace-3.0 origin/utrace-3.0git diff v3.0 > /tmp/utrace.patch

获得Ubuntu定制内核代码，并打上utrace补丁

sudo apt-get install linux-sourcetar xjf /usr/src/linux-source-3.0.0.tar.bz2cd linux-source-3.0.0/patch -p1 < /tmp/utrace.patch

输出为：

patching file Documentation/DocBook/Makefilepatching file Documentation/DocBook/utrace.tmplpatching file arch/x86/kernel/ptrace.cpatching file fs/proc/array.cpatching file include/linux/ptrace.hpatching file include/linux/sched.hHunk #1 succeeded at 187 (offset 3 lines).Hunk #2 succeeded at 206 (offset 3 lines).Hunk #3 succeeded at 1415 with fuzz 2 (offset 7 lines).patching file include/linux/signal.hpatching file include/linux/tracehook.hpatching file include/linux/utrace.hpatching file init/KconfigHunk #1 succeeded at 388 (offset 16 lines).patching file kernel/Makefilepatching file kernel/fork.cHunk #1 FAILED at 168.Hunk #2 succeeded at 1098 (offset 3 lines).1 out of 2 hunks FAILED -- saving rejects to file kernel/fork.c.rejpatching file kernel/ptrace.cpatching file kernel/sched.cpatching file kernel/signal.cHunk #4 succeeded at 1993 (offset -2 lines).Hunk #5 succeeded at 2017 (offset -2 lines).Hunk #6 succeeded at 2124 (offset -2 lines).Hunk #7 succeeded at 2132 (offset -2 lines).patching file kernel/utrace.c

?注意 kernel/fork.c 的补丁失败了，看看 kernel/fork.c.rej：

--- kernel/fork.c                                                               +++ kernel/fork.c                                                               @@ -168,6 +168,7 @@                                                                 free_thread_info(tsk->stack);                                                   rt_mutex_debug_task_free(tsk);                                                  ftrace_graph_exit_task(tsk);                                                +   tracehook_free_task(tsk);                                                       free_task_struct(tsk);                                                       }                                                                               EXPORT_SYMBOL(free_task);                                                      

修改 kernel/fork.c，在 free_task 函数的 ftrace_graph_exit_task(tsk); 之后手工加上这行 tracehook_free_task 调用即可。
编译新的内核，使用当前系统内核的配置参数作为基准，开启 utrace 补丁提供的 CONFIG_UTRACE 功能即可：

cp /boot/config-`uname -r` .configmake oldconfig ，出现如下提示时回答 y：Infrastructure for tracing and debugging user processes (UTRACE) [N/y/?] (NEW)?make-kpkg cleanexport CONCURRENCY_LEVEL=9 ，这里指定编译内核时的并发任务数，设置为核数+1即可fakeroot make-kpkg --initrd --append-to-version=-utrace binary-arch

编译完成后，在 linux-source-3.0.0/ 的上级目录会生成 linux-headers/image/debug-symbol 的 deb 安装包，直接用 sudo dpkg -i *.deb 安装即可。重启后选择新内核进入即可用 systemtap 进行用户态程序跟踪。

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参考：

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https://help.ubuntu.com/community/Kernel/Compile#Alternate_Build_Method:_The_Old-Fashioned_Debian_Way

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