Re: Reg:Oprofile :Kernel support not available, missing opcontrol --init as root ?

[Mano_ <r.m...@sa...>]

Hi Manoj, 

Please do the following steps.... 
 
        mkdir /dev/oprofile
        mkdir /root/.oprofile
        mkdir /var/lib/oprofile

In case your filesystem is a Read only filesystem... then during compile
time before you create your rootfilesystem image, create /dev/oprofile,
/root/.oprofile and /var/lib/oprofile as a soft link (ln -s) to some
directories in a read and write filesystem... 

Say for an example... in your environment /dev/, /root/ and /var/lib all
belongs to a read only environment and let us say in your environment /tmp
is mounted on a read and write filesystem... 

then In your host system (i.e.,) the build system... 
                  cd <path where your rootfilesytem files are stored before
made to a rootfs>
                  ln -s /tmp/oprofile_dev ./dev/oprofile
                  ln -s /tmp/oprofile_samples ./var/lib/oprofile
                  ln -s /tmp/.oprofile             ./root/.oprofile

Now build your images again... put it in to your target.... 

            step 1) create /tmp/oprofile_dev /tmp/oprofile_samples
/tmp/.oprofile
                   2) insmod <path to your oprofile.ko>
                   3) mount -t oprofilefs nodev /dev/oprofile
                   4) now do a ls /dev/oprofile/
                             This should show some files such as cpu_type,
buffer, buffer_size etc... 
                   5) now do oprofile --init
                   6) Now you can start profiling by using
                               oprofile --start --no-vmlinux
                                      --> I suppose you don't have vmlinux
image in your target, that is why I have given --no-vmlinux if you have then
give the path using --vmlinux option.... 

with thanks,
V.Manoharan

                   


manoj reddy wrote:
> 
> Hi Sir
> Iam working on cross compiling oprofile to arm target device.
> Iam able to compile without ant issues with configure options
>     ./configure --host=$(TGT_CPU) --prefix=$(CUR_DIR)/lib/oprofile
> --with-kernel-support
> Iam using 2.6 kernel changes profiling  flags to y on kernel.config.
> After comipiling i copied binaries to target device .
> When run
>  opcontrol --no-vmlinux
> Iam getting this
> mount: mounting nodev on /dev/oprofile failed: Device or resource busy
> Kernel support not available, missing opcontrol --init as root ?
> 
> Kindly help wat else i have to do for oprofile to run without any issues
> 
> Thanks in advance
> Manoj
> 
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> 
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