Re: Oprofile on ST40 target

[Maynard J. <may...@us...>]

On 03/19/2012 09:01 AM, Bail, Eloi wrote:
> Hi all,
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> I want to use Oprofile on an embedded environment within a ST40 chipset.
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> ST already ported Oprofile on their platform (see link : http://www.stlinux.com/devel/traceprofile/profiling)
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> I successfully recompiled the kernel (version 2.6.XX) enabling Oprofiling and Kernel debugging information.
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> I used Oprofile binaries compiled on the correct target & kernel.
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> Whereas I am trying to execute opcontrol, I have got the following errors :
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> *# ./opcontrol --init --vmlinux=vmlinux_custom00200832 *
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> mount: mounting nodev on /dev/oprofile failed: Device or resource busy
This error occurred when trying to do the "--init" part of the above command..
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> Kernel support not available, missing opcontrol --init as root ?
This error occurred because you're trying to run the --vmlinux option without having successfully executed --init first (granted, the error message is not too clear).  So just try the "--init" by itself and debug why the mount of /dev/oprofile is failing.  Maybe something will show up in dmesg.

-Maynard
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> Device oprofile seems to be correctly mounted :
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> *# ls -lrt /dev/oprofile/*
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> drwxr-xr-x    1 root     root            0 Dec 31 17:07 stats
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> -rw-r--r--    1 root     root            0 Dec 31 17:07 pointer_size
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> -rw-r--r--    1 root     root            0 Dec 31 17:07 enable
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> -rw-rw-rw-    1 root     root            0 Dec 31 17:07 dump
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> -rw-r--r--    1 root     root            0 Dec 31 17:07 cpu_type
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> -rw-r--r--    1 root     root            0 Dec 31 17:07 cpu_buffer_size
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> -rw-r--r--    1 root     root            0 Dec 31 17:07 buffer_watershed
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> -rw-r--r--    1 root     root            0 Dec 31 17:07 buffer_size
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> -rw-r--r--    1 root     root            0 Dec 31 17:07 buffer
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> -rw-r--r--    1 root     root            0 Dec 31 17:07 backtrace_depth
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> #
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> èCould you explain me why this error regarding oprofile device occured ?
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> Regarding the second error (Kernel support not available, missing opcontrol --init as root ?)
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> èCould you help me to figure out the issue :
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> -          Did I add correct option in the kernel ?
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> -          Do I have permission issue (notice that I am root on my machine) ?
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> -          Is opcontrol not correctly compiled ?
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> Thanks for your advice,
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> Eloi
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