问题：can't open '/dev/oprofile/cpu_type': No such fi

问题：can't open '/dev/oprofile/cpu_type': No such file or directory

问题现象:

# ./opcontrol --init
cat: can't open '/dev/oprofile/cpu_type': No such file or directory
Unable to open cpu_type file for reading
Make sure you have done opcontrol --init
cpu_type 'unset' is not valid
you should upgrade oprofile or force the use of timer mode

解决方法：

Step1：重新启动target
step2：执行# ./opcontrol --init
       显示：

        # ./opcontrol --init

        cat: can't open '/dev/oprofile/cpu_type': No such file or directory
        Unable to open cpu_type file for reading
        Make sure you have done opcontrol --init
        cpu_type 'unset' is not valid
        you should upgrade oprofile or force the use of timer mode


Step3: 删除/etc目录下的mtab文件
          Rm -f /etc/mtab

Step4:执行# ./opcontrol --init
       显示：
       # ./opcontrol --init
       grep: /etc/mtab: No such file or directory
       grep: /etc/mtab: No such file or directory

Step5:重新在/etc/目录下创建mtab并添加“nodev /dev/oprofile oprofilefs rw 0 0”
         touch /etc/mtab
         Vi /etc/mtab

         Insert  "nodev /dev/oprofile oprofilefs rw 0 0"   --->在mtab中添加的内容

Step6:执行# ./opcontrol --init
         ok