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Date: Fri, 23 Jan 2015 13:51:28 -0600
From: Felipe Balbi <balbi@...com>
To: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>
CC: Tony Lindgren <tony@...mide.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux ARM Kernel Mailing List
<linux-arm-kernel@...ts.infradead.org>,
Linux OMAP Mailing List <linux-omap@...r.kernel.org>
Subject: perf not capturing stack traces
Hi,
I'm using v3.19-rc5 on an ARM Cortex A9 board. Unfortunately, perf is
not able to capture any stack traces even though I CONFIG_STACKTRACE,
CONFIG_FRAME_POINTER and CONFIG_ARM_UNWIND all enabled.
I wonder if anybody else is facing similar issues.
Here's console grab:
perf record -e 'sched:*' -ag sleep 5 && perf report --stdio
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.092 MB perf.data (~4024 samples) ]
# To display the perf.data header info, please use --header/--header-only option
#
# Samples: 0 of event 'sched:sched_kthread_stop'
# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 0 of event 'sched:sched_kthread_stop_ret'
# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 62 of event 'sched:sched_wakeup'
# Event count (approx.): 62
#
# Children Self Command Shared Object Symbol
# ........ ........ ........... ............. ..............
:#
74.19% 74.19% swapper [unknown] [.] 00000000
|
---0
11.29% 11.29% kworker/0:2 [unknown] [.] 00000000
|
---0
9.68% 9.68% perf [unknown] [.] 00000000
|
---0
3.23% 3.23% sleep [unknown] [.] 00000000
|
---0
1.61% 1.61% ksoftirqd/0 [unknown] [.] 00000000
|
---0
:# Samples: 0 of event 'sched:sched_wakeup_new'
# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 102 of event 'sched:sched_switch'
# Event count (approx.): 102
#
# Children Self Command Shared Object Symbol
# ........ ........ ............ ............. ..............
#
31.37% 31.37% swapper [unknown] [.] 00000000
|
---0
20.59% 20.59% kworker/0:2 [unknown] [.] 00000000
|
---0
15.69% 15.69% ksoftirqd/0 [unknown] [.] 00000000
: |
---0
11.76% 11.76% perf [unknown] [.] 00000000
|
---0
11.76% 11.76% sleep [unknown] [.] 00000000
|
---0
7.84% 7.84% rcu_sched [unknown] [.] 00000000
|
---0
0.98% 0.98% kworker/u2:1 [unknown] [.] 00000000
|
---0
# Samples: 0 of event 'sched:sched_migrate_task'
# Event count (approx.): 0
:#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 0 of event 'sched:sched_process_free'
# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 1 of event 'sched:sched_process_exit'
# Event count (approx.): 1
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ..............
#
100.00% 100.00% sleep [unknown] [.] 00000000
|
---0
:
# Samples: 0 of event 'sched:sched_wait_task'
# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 0 of event 'sched:sched_process_wait'
# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 0 of event 'sched:sched_process_fork'
# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
:# ........ ........ ....... ............. ......
#
# Samples: 1 of event 'sched:sched_process_exec'
# Event count (approx.): 1
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ..............
#
100.00% 100.00% sleep [unknown] [.] 00000000
|
---0
# Samples: 70 of event 'sched:sched_stat_wait'
# Event count (approx.): 17926123
#
# Children Self Command Shared Object Symbol
# ........ ........ ........... ............. ..............
#
33.13% 33.13% ksoftirqd/0 [unknown] [.] 00000000
: |
---0
24.83% 24.83% perf [unknown] [.] 00000000
|
---0
21.44% 21.44% sleep [unknown] [.] 00000000
|
---0
20.60% 20.60% rcu_sched [unknown] [.] 00000000
|
---0
0.00% 0.00% kworker/0:2 [unknown] [.] 00000000
|
---0
0.00% 0.00% swapper [unknown] [.] 00000000
|
---0
:
# Samples: 43 of event 'sched:sched_stat_sleep'
# Event count (approx.): 119659990589
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ..............
#
95.01% 95.01% swapper [unknown] [.] 00000000
|
---0
4.93% 4.93% sleep [unknown] [.] 00000000
|
---0
0.06% 0.06% perf [unknown] [.] 00000000
|
---0
# Samples: 7 of event 'sched:sched_stat_iowait'
:# Event count (approx.): 37447751
#
# Children Self Command Shared Object Symbol
# ........ ........ ........... ............. ..............
#
100.00% 100.00% kworker/0:2 [unknown] [.] 00000000
|
---0
# Samples: 19 of event 'sched:sched_stat_blocked'
# Event count (approx.): 42514750
#
# Children Self Command Shared Object Symbol
# ........ ........ ........... ............. ..............
#
88.08% 88.08% kworker/0:2 [unknown] [.] 00000000
|
---0
7.24% 7.24% swapper [unknown] [.] 00000000
|
: ---0
3.81% 3.81% ksoftirqd/0 [unknown] [.] 00000000
|
---0
0.86% 0.86% perf [unknown] [.] 00000000
|
---0
# Samples: 79 of event 'sched:sched_stat_runtime'
# Event count (approx.): 46820375
#
# Children Self Command Shared Object Symbol
# ........ ........ ............ ............. ..............
#
27.85% 27.85% perf [unknown] [.] 00000000
|
---0
27.48% 27.48% kworker/0:2 [unknown] [.] 00000000
: |
---0
20.79% 20.79% sleep [unknown] [.] 00000000
|
---0
12.51% 12.51% ksoftirqd/0 [unknown] [.] 00000000
|
---0
8.96% 8.96% rcu_sched [unknown] [.] 00000000
|
---0
2.41% 2.41% kworker/u2:1 [unknown] [.] 00000000
|
---0
# Samples: 0 of event 'sched:sched_pi_setprio'
# Event count (approx.): 0
:#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 0 of event 'sched:sched_move_numa'
# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 0 of event 'sched:sched_stick_numa'
# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 0 of event 'sched:sched_swap_numa'
:# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
# Samples: 0 of event 'sched:sched_wake_idle_without_ipi'
# Event count (approx.): 0
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ............. ......
#
--
balbi
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