From: Tomas Glozar on gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/3815#note_2434334839
Verified that BPF sample collection is indeed working in ARK kernel after the
spec update:
```
tglozar@cs10:~$ uname -a
Linux cs10 6.14.0-10.3815_1750908656.el10.x86_64 #1 SMP PREEMPT_DYNAMIC Thu
Apr 3 12:05:40 EDT 2025 x86_64 GNU/Linux
tglozar@cs10:~$ rtla --version
rtla version 6.14.0-10.3815_1750908656.el10.x86_64
usage: rtla COMMAND ...
commands:
osnoise - gives information about the operating system noise (osnoise)
hwnoise - gives information about hardware-related noise
timerlat - measures the timer irq and thread latency
tglozar@cs10:~$ ldd /usr/bin/rtla
linux-vdso.so.1 (0x00007fe014aea000)
libtraceevent.so.1 => /lib64/libtraceevent.so.1 (0x00007fe014a92000)
libtracefs.so.1 => /lib64/libtracefs.so.1 (0x00007fe014a6a000)
libcpupower.so.1 => /lib64/libcpupower.so.1 (0x00007fe014a61000)
libbpf.so.1 => /lib64/libbpf.so.1 (0x00007fe0149fb000)
libc.so.6 => /lib64/libc.so.6 (0x00007fe014822000)
libelf.so.1 => /lib64/libelf.so.1 (0x00007fe014805000)
libz.so.1 => /lib64/libz.so.1 (0x00007fe0147e2000)
/lib64/ld-linux-x86-64.so.2 (0x00007fe014aec000)
libzstd.so.1 => /lib64/libzstd.so.1 (0x00007fe014731000)
tglozar@cs10:~$ sudo rtla timerlat top -D -q -d 10s
setting cpus to all from 0-13
reading osnoise/stop_tracing_us returned 0
setting osnoise/stop_tracing_us to 0
reading osnoise/stop_tracing_total_us returned 0
setting osnoise/stop_tracing_total_us to 0
reading osnoise/timerlat_period_us returned 1000
setting osnoise/timerlat_period_us to 1000
reading osnoise/print_stack returned 0
setting osnoise/print_stack to 0
User-space interface detected, setting user-threads
Loading BPF program
Enabling timerlat tracer
Attaching BPF program
Dispatching timerlat u procs
User-space timerlat pid 4976 on cpu 0
User-space timerlat pid 4977 on cpu 1
User-space timerlat pid 4978 on cpu 2
User-space timerlat pid 4979 on cpu 3
User-space timerlat pid 4980 on cpu 4
User-space timerlat pid 4982 on cpu 6
User-space timerlat pid 4983 on cpu 7
User-space timerlat pid 4984 on cpu 8
User-space timerlat pid 4985 on cpu 9
User-space timerlat pid 4986 on cpu 10
User-space timerlat pid 4981 on cpu 5
User-space timerlat pid 4987 on cpu 11
User-space timerlat pid 4988 on cpu 12
User-space timerlat pid 4989 on cpu 13
Timer Latency
0 00:00:11 | IRQ Timer Latency (us) | Thread Timer
Latency (us) | Ret user Timer Latency (us)
CPU COUNT | cur min avg max | cur min
avg max | cur min avg max
0 #10001 | 9 0 7 474 | 19 3
18 645 | 23 4 21 648
1 #10000 | 10 0 3 462 | 20 2
10 466 | 24 3 13 469
2 #10000 | 1 0 6 464 | 4 3
16 476 | 5 3 19 480
3 #10000 | 13 0 5 567 | 21 2
12 579 | 25 3 15 583
4 #10001 | 9 0 4 498 | 19 2
11 503 | 23 3 13 505
5 #10001 | 7 0 2 630 | 14 2
8 642 | 18 3 10 646
6 #10000 | 1 0 2 229 | 4 2
7 252 | 5 3 8 286
7 #10000 | 2 0 7 535 | 11 3
17 539 | 14 3 21 541
8 #10000 | 2 0 5 315 | 9 2
15 327 | 12 3 19 331
9 #10001 | 1 0 3 559 | 4 2
9 571 | 5 3 11 575
10 #10000 | 9 0 5 497 | 19 2
13 508 | 23 3 16 514
11 #10001 | 1 0 5 568 | 4 2
14 580 | 5 3 18 584
12 #10000 | 3 0 5 642 | 10 2
15 654 | 14 3 18 658
13 #10000 | 11 0 2 482 | 20 2
7 492 | 24 3 9 496
---------------|----------------------------------------|---------------------
-------------------|---------------------------------------
ALL #140005 e0 | 0 4 642 | 2
12 654 | 3 15 658
restoring cpus to 0-13
tglozar@cs10:~$
```
--
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