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SubjectRe: Strange reports of perf events on powerpc 83xx
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On Thu, 2015-08-27 at 15:58 +0200, leroy christophe wrote:
> 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 ?

We are also experiencing strange addresses on 83xx, did find the cause
of this problem?

We are using Linux 4.1.0

>
> # 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



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