linux-kernel - Re: Strange reports of perf events on powerpc 83xx

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 2 Sep 2015 14:20:38 +0000
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	"christophe.leroy@....fr" <christophe.leroy@....fr>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Strange reports of perf events on powerpc 83xx

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/