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SubjectRe: [Questions] How to run 'perf top' on ARM to profile kernel functions with modules loaded
From
2010/11/11 Ming Lei <tom.leiming@gmail.com>:
> Hi,
>
> 'perf top' can't display any functions when modules are loaded on ARM.

Sorry, should be can't display any kernel functions when modules are loaded
on ARM.

Also, when modules are loaded, 'perf report' can't display functions names,
follows result of 'perf report':

root@beagleboard:~# perf report
# Events: 4K cycles
#
# Overhead Command Shared Object Symbol
# ........ ........... ................. ......................
#
97.36% swapper [musb_hdrc] [k] 10466c4
2.19% perf [musb_hdrc] [k] 10da070
0.09% ksoftirqd/0 [musb_hdrc] [k] 10db998
0.06% perf libc-2.9.so [.] memchr
0.04% perf libc-2.9.so [.] 663c0
0.02% perf perf [.] 2e80
0.02% perf libc-2.9.so [.] closedir
0.02% perf libc-2.9.so [.] __read
0.02% flush-179:0 [musb_hdrc] [k] 10ff124
0.02% perf libc-2.9.so [.] memset
0.02% perf libc-2.9.so [.] __memcpy_chk
0.02% perf perf [.] event__synthesize_comm
0.02% perf ffff0fc4 [.] ffff0fc4
0.02% perf perf [.] hex2u64
0.02% perf libc-2.9.so [.] _IO_vfprintf
0.02% perf libc-2.9.so [.] fgets
0.02% perf libpthread-2.9.so [.] flockfile
0.02% perf perf [.] kallsyms__parse
0.02% perf libc-2.9.so [.] _IO_getline_info
Any suggestions or comments?

thanks,
--
Lei Ming


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