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SubjectARM64 perf stacktraces on tracepoint events
Hi,

On 3.18 kernel running on an arm64 device, I tried running:
perf record -a -g -e sched:sched_wakeup

I was expecting something like the output at:
www.brendangregg.com/perf.html

But I don't see stacktraces, could I be missing any patches you could
point me to? I do see stack traces if I do regular perf profiling
(perf record -F 99 -a -g).

Below is the output I get. Thanks for any insight into this.

Regards,
Joel

sailfish:/data # ./perf report
# Samples: 22 of event 'sched:sched_wakeup'
# Event count (approx.): 410333
#
# Children Self Trace output
# ........ ........
.............................................................
#
61.29% 61.29% comm=ksoftirqd/0 pid=3 prio=120 success=1 target_cpu=000
|
---0

33.25% 33.25% comm=hw pid=12777 prio=120 success=1 target_cpu=002
|
---0

2.46% 2.46% comm=kworker/u8:2 pid=12482 prio=120 success=1
target_cpu=002
|
---0

1.39% 1.39% comm=migration/2 pid=21 prio=0 success=1 target_cpu=002
|
---0

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