perf shows zero for cycle and instruction counts on TC2
Bug #1217893 reported by
Tixy (Jon Medhurst)
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linaro Android |
Won't Fix
|
High
|
Tixy (Jon Medhurst) |
Bug Description
When running the 'perf' QA test on the 13.08 release [1] I noticed that running 'perf stat ls' shows zero values for cycles, instructions and branches. The same kernel on A9 vexpress gives plausible values.
[1] https:/
tags: | added: perf |
Changed in linaro-android: | |
status: | New → Confirmed |
Changed in linaro-android: | |
assignee: | nobody → Tixy (Jon Medhurst) (tixy) |
importance: | Undecided → High |
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root@vexpress: /data/local # perf stat ls
network-test.sh
powertop
tmp
Performance counter stats for 'ls':
7.370816 task-clock # 0.743 CPUs utilized
0 context-switches # 0.000 M/sec
0 CPU-migrations # 0.000 M/sec
145 page-faults # 0.020 M/sec
0 cycles # 0.000 GHz
<not counted> stalled- cycles- frontend cycles- backend
<not counted> stalled-
0 instructions # 0.00 insns per cycle
0 branches # 0.000 M/sec
0 branch-misses # 0.00% of all branches
0.009922083 seconds time elapsed
root@vexpress: /data/local # uname -a 00363-gb660011 #1 SMP Wed Oct 16 12:16:40 UTC 20 /data/local #
Linux localhost 3.10.16-
13 armv7l GNU/Linux
root@vexpress:
Build: /android- build.linaro. org/builds/ ~linaro- android/ vexpress- lsk/#build= 52
https:/