Strange reports of perf events on powerpc 83xx

Strange reports of perf events on powerpc 83xx

[christophe leroy]

Hi,

Has anybody already used 'perf' tool on powerpc MPC83xx ?

I have been succesfully using perf on MPC8xx, but on MPC83xx I get 
something strange.

perf record/report reports addresses on user stack, as if it was mixing 
up D accesses and I accesses.

Any idea of what the problem can be ?

# Samples: 8K of event 'cpu-clock'
# Event count (approx.): 2196000000
#
# Overhead  Command       Shared Object       Symbol
# ........  ............  .................. 
............................................
#
       2.62%  perf_reseau4  libpthread-2.18.so  [.] __libc_send
       2.56%  perf_reseau4  [kernel.kallsyms]   [k] __ip_make_skb
       1.62%  perf_reseau4  [kernel.kallsyms]   [k] __ip_append_data.isra.39
       1.55%  perf_reseau4  [kernel.kallsyms]   [k] ip_finish_output
       1.33%  perf_reseau4  [unknown]           [k] 0x7ffffd94
       1.33%  perf_reseau4  [unknown]           [k] 0x7ffffd95
       1.28%  perf_reseau4  [unknown]           [k] 0x7ffffd97
       1.26%  perf_reseau4  [unknown]           [k] 0x7ffffda3
       1.24%  perf_reseau4  [unknown]           [k] 0x7ffffd98
       1.22%  perf_reseau4  [unknown]           [k] 0x7ffffd92
       1.22%  perf_reseau4  [unknown]           [k] 0x7ffffd9b
       1.22%  perf_reseau4  [unknown]           [k] 0x7ffffdaa
       1.21%  perf_reseau4  [unknown]           [k] 0x7ffffd96
       1.18%  perf_reseau4  [unknown]           [k] 0x7ffffda7
       1.17%  perf_reseau4  [unknown]           [k] 0x7ffffd8d
       1.17%  perf_reseau4  [unknown]           [k] 0x7ffffd99
       1.13%  perf_reseau4  [unknown]           [k] 0x7ffffd90
       1.13%  perf_reseau4  [unknown]           [k] 0x7ffffda2
       1.12%  perf_reseau4  [kernel.kallsyms]   [k] __local_bh_enable_ip
       1.12%  perf_reseau4  [unknown]           [k] 0x7ffffd9c
       1.12%  perf_reseau4  [unknown]           [k] 0x7ffffd9e
       1.10%  perf_reseau4  [unknown]           [k] 0x7ffffda0
       1.08%  perf_reseau4  [unknown]           [k] 0x7ffffd9f
       1.08%  perf_reseau4  [unknown]           [k] 0x7ffffda6
       1.05%  perf_reseau4  [unknown]           [k] 0x7ffffda8
       1.02%  perf_reseau4  [unknown]           [k] 0x7ffffd9a
       1.01%  perf_reseau4  [unknown]           [k] 0x7ffffdb0
       1.00%  perf_reseau4  [unknown]           [k] 0x7ffffd89
       1.00%  perf_reseau4  [unknown]           [k] 0x7ffffd8b
       1.00%  perf_reseau4  [unknown]           [k] 0x7ffffdac


Christophe


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