Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1214585 > unrolled thread
| Started by | leroy christophe <christophe.leroy@c-s.fr> |
|---|---|
| First post | 2015-08-27 16:00 +0200 |
| Last post | 2015-09-02 20:50 +0200 |
| Articles | 3 — 3 participants |
Back to article view | Back to linux.kernel
Strange reports of perf events on powerpc 83xx leroy christophe <christophe.leroy@c-s.fr> - 2015-08-27 16:00 +0200
Re: Strange reports of perf events on powerpc 83xx Joakim Tjernlund <joakim.tjernlund@transmode.se> - 2015-09-02 16:30 +0200
Re: Strange reports of perf events on powerpc 83xx christophe leroy <christophe.leroy@c-s.fr> - 2015-09-02 20:50 +0200
| From | leroy christophe <christophe.leroy@c-s.fr> |
|---|---|
| Date | 2015-08-27 16:00 +0200 |
| Subject | Strange reports of perf events on powerpc 83xx |
| Message-ID | <q25SH-6fM-29@gated-at.bofh.it> |
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[toc] | [next] | [standalone]
| From | Joakim Tjernlund <joakim.tjernlund@transmode.se> |
|---|---|
| Date | 2015-09-02 16:30 +0200 |
| Message-ID | <q4hcZ-7Er-11@gated-at.bofh.it> |
| In reply to | #1214585 |
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@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[toc] | [prev] | [next] | [standalone]
| From | christophe leroy <christophe.leroy@c-s.fr> |
|---|---|
| Date | 2015-09-02 20:50 +0200 |
| Message-ID | <q4lgC-4Zd-13@gated-at.bofh.it> |
| In reply to | #1217636 |
Le 02/09/2015 16:20, Joakim Tjernlund a écrit : > 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 I identified this afternoon that the issue comes from perf_instruction_pointer() which reads SPRN_SIAR instead of using the NIP register from the pt_regs struct According to the MPC8323 reference manual, there is no such register. I'm looking at the history in order to fully understand the reason. Looks like PPC_HAVE_PMU_SUPPORT is selected for all PPC_BOOK3S_32 allthought mpc832x has no PMU. Christophe > >> # 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 --- L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast. https://www.avast.com/antivirus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[toc] | [prev] | [standalone]
Back to top | Article view | linux.kernel
csiph-web