Documentation/basic_profiling.txt

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Documentation/basic_profiling.txt的中文翻译

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中文版翻译者：秦芹 18768122412@163.com

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 These instructions are deliberately very basic. If you want something clever,
 go read the real docs ;-) Please don't add more stuff, but feel free to 
 correct my mistakes ;-)    (mbligh@aracnet.com)
 Thanks to John Levon, Dave Hansen, et al. for help writing this.
 这些介绍是计算机科学技术里很基础的，如果你想要看一些比较深入的知识，
 请阅读另外一些深入的文档，在不要添加更多的资料的基础上，认真纠正我

 的错误（mbligh@aracnet.com）
 谢谢John Levon, Dave Hansen等人对写这片文章的帮助。
 <test> is the thing you're trying to measure.
 Make sure you have the correct System.map / vmlinux referenced!
 你应该试着测试一下，确保存在System.map / vmlinux目录。
 It is probably easiest to use "make install" for linux and hack
 /sbin/installkernel to copy vmlinux to /boot, in addition to vmlinuz,
 config, System.map, which are usually installed by default.
 对于linux这非常容易使用 make instal，回到/sbin/installkernel 目录

 复制vmlinux到/boot，除了vmlinux配置System.map通常是默认安装的。
 Readprofile
 -----------
 A recent readprofile command is needed for 2.6, such as found in util-linux
 2.12a, which can be downloaded from:
 http://www.kernel.org/pub/linux/utils/util-linux/
 Most distributions will ship it already.
 最近readprofile的命令要求的版本是2.6，因此如果发现util-linux的版本是2.12a，

 你就应该从http://www.kernel.org/pub/linux/utils/util-linux/下载：
 大多数分布应该已经发行。
 Add "profile=2" to the kernel command line.
 增加"profile=2"到kernel命令行。
 clear           readprofile -r
                 <test>
 dump output     readprofile -m /boot/System.map > captured_profile
 
 Oprofile
 --------
 
 Get the source (see Changes for required version) from
 http://oprofile.sourceforge.net/ and add "idle=poll" to the kernel command
 line.
 Configure with CONFIG_PROFILING=y and CONFIG_OPROFILE=y & reboot on new kernel
 ./configure --with-kernel-support
 make install
 得到资源后（看一下不同点从要求的版本）从http://oprofile.sourceforge.net/增加idle=poll

 到kernel命令行。

 配置CONFIG_PROFILING=y and CONFIG_OPROFILE=y和重新配置kernel

 For superior results, be sure to enable the local APIC. If opreport sees
 a 0Hz CPU, APIC was not on. Be aware that idle=poll may mean a performance
 penalty.
 对于这个结果，应该确保本地的APIC如果从报告中看出0HZCPU
 和APIC也没启动，则意味着idle=poll指令失败了。
 One time setup:

 下面为一次启动过程：
                 opcontrol --setup --vmlinux=/boot/vmlinux
 
 clear           opcontrol --reset
 start           opcontrol --start
                 <test>
 stop            opcontrol --stop
 dump output     opreport >  output_file
 
 To only report on the kernel, run opreport -l /boot/vmlinux > output_file
 A reset is needed to clear old statistics, which survive a reboot.
 对于这个仅仅运行在内核上的报告，执行opreport -l /boot/vmlinux > output_file
 为了清除旧的数据统计，重新启动复位是必须的。