Oprofile on ST40 target

[Bail, E. <EB...@nd...>]

Hi all,


I want to use Oprofile on an embedded environment within a ST40 chipset.

ST already ported Oprofile on their platform (see link : http://www.stlinux.com/devel/traceprofile/profiling)

I successfully recompiled the kernel (version 2.6.XX) enabling Oprofiling and Kernel debugging information.


I used Oprofile binaries compiled on the correct target & kernel.


Whereas I am trying to execute opcontrol, I have got the following errors :


# ./opcontrol --init --vmlinux=vmlinux_custom00200832
mount: mounting nodev on /dev/oprofile failed: Device or resource busy
Kernel support not available, missing opcontrol --init as root ?


Device oprofile seems to be correctly mounted :

# ls -lrt /dev/oprofile/
drwxr-xr-x    1 root     root            0 Dec 31 17:07 stats
-rw-r--r--    1 root     root            0 Dec 31 17:07 pointer_size
-rw-r--r--    1 root     root            0 Dec 31 17:07 enable
-rw-rw-rw-    1 root     root            0 Dec 31 17:07 dump
-rw-r--r--    1 root     root            0 Dec 31 17:07 cpu_type
-rw-r--r--    1 root     root            0 Dec 31 17:07 cpu_buffer_size
-rw-r--r--    1 root     root            0 Dec 31 17:07 buffer_watershed
-rw-r--r--    1 root     root            0 Dec 31 17:07 buffer_size
-rw-r--r--    1 root     root            0 Dec 31 17:07 buffer
-rw-r--r--    1 root     root            0 Dec 31 17:07 backtrace_depth
#



è Could you explain me why this error regarding oprofile device occured ?


Regarding the second error (Kernel support not available, missing opcontrol --init as root ?)


è Could you help me to figure out the issue :


-          Did I add correct option in the kernel ?

-          Do I have permission issue (notice that I am root on my machine) ?

-          Is opcontrol not correctly compiled ?


Thanks for your advice,


Eloi


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