Hi Jianhui,
Thanks for letting us know, I can reproduce this issue in IoT Yocto's
rity-demo-image on Genio 1200 EVK:
```
root@genio-1200-evk:~# sudo taskset -c 7 perf stat -e
armv8_cortex_a55/cpu_cycles/ -e armv8_cortex_a78/cpu_cycles/ -e cycles stress
-c 7 --timeout 1s
stress-ng: info: [3843] setting to a 1 second run per stressor
stress-ng: info: [3843] dispatching hogs: 7 cpu
stress-ng: info: [3843] successful run completed in 1.16s
Performance counter stats for 'stress -c 7 --timeout 1s':
<not counted> armv8_cortex_a55/cpu_cycles/
(0.00%)
2480555362 armv8_cortex_a78/cpu_cycles/
<not counted> cycles
(0.00%)
1.168242000 seconds time elapsed
1.154762000 seconds user
0.011472000 seconds sys
```
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https://bugs.launchpad.net/bugs/2060063
Title:
PMU counters for Cortex-A78 not working correctly
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