perf_event_tests: branches and non-existent are failing for aarch64

[muralimk51]

Hi,

I am using Hikey (ARM64) target.
{{{
/ # cat /proc/cpuinfo
processor : 0
BogoMIPS : 3.84
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4
....
}}}

When I execute perf_event_tests below are failing:

[1]. perf "branches" test failing with below error:
{{{
perf_event-branches ] # Error: Testing a loop with 1500000 branches (100 times):
[perf_event-branches ] # Error: Expected: 1500000
[perf_event-branches ] # Error: High: 1000006 Low: 1000003 Average: 1000004
[perf_event-branches ] # Error: ( note, a small value above 1500000 may be expected due
[perf_event-branches ] # Error: to overhead and interrupt noise, among other reasons)
[perf_event-branches ] # Error: Average Error = -33.33%
[perf_event-branches ] # Error: Instruction count off by more than 1%
[perf_event-branches ] # Error: Testing "branches" generalized event... ^[[1;31mFAILED^[[0m
}}}

[2]. perf "non-existent" failing with below error:
{{{
Testing if non-existent events fail... ^[[1mSKIPPED^[[0m
}}}

Could you please share your comments whether this supports AArch64 targets or not. and How to resolve above issues.

Thanks,
Murali