rgushchin/atc

atc's Issues

Question: libbpf: failed to find kernel BTF type ID of 'cfs_select_task_rq': -3

hi，rgushchin:
I am interesting in your scheduler path in linux kernel. So I clone the "bpfsched.rfc kernel" in your repository and I finished compiling it. Then I clone "atc" example and make in it's directory, this time I get executable file named atc.
But when I use ./atc -c ls or ./atc -p with number. I get wrong information as following:
"""
libbpf: sec 'sched/cfs_select_task_rq': found 2 CO-RE relocations
libbpf: prog 'select_task_rq': relo #0: kind <byte_off> (0), spec is [6] struct task_struct.se (0:18 @ offset 128)
libbpf: prog 'select_task_rq': relo #0: matching candidate #0 [130] struct task_struct.se (0:20 @ offset 192)
libbpf: prog 'select_task_rq': relo #0: patched insn #21 (ALU/ALU64) imm 128 -> 192
libbpf: prog 'select_task_rq': relo #1: kind <byte_off> (0), spec is [6] struct task_struct.se (0:18 @ offset 128)
libbpf: prog 'select_task_rq': relo #1: matching candidate #0 [130] struct task_struct.se (0:20 @ offset 192)
libbpf: prog 'select_task_rq': relo #1: patched insn #35 (ALU/ALU64) imm 128 -> 192
libbpf: failed to find kernel BTF type ID of 'cfs_select_task_rq': -3
libbpf: failed to load object 'atc_bpf'
libbpf: failed to load BPF skeleton 'atc_bpf': -3
Failed to load and verify BPF skeleton
""""
I don't know why does it and how can I tackle it . Can you give me some suggestion? Thanks very much.
Look forward to your favourable reply,
duihuhu

libbpf: failed to find BTF for extern 'bpf_sched_entity_belongs_to_cgrp'

@rgushchin
When I built this code by running make, I got this error:
"gen skeleton atc.bpf.o > atc.skel.h
libbpf: failed to find BTF for extern 'bpf_sched_entity_belongs_to_cgrp': -2
Error: failed to open BPF object file: No such file or directory"

Any idea how to fix it?

There is my environment:

• I compiled the kernel with your patch " bpf: sched: basic infrastructure for scheduler bpf"
• enabled "CONFIG_DEBUG_INFO_BTF=y CONFIG_PAHOLE_HAS_SPLIT_BTF=y CONFIG_DEBUG_INFO_BTF_MODULES=y"
• rebuilt lib/bpf and bpftool
• generated vmlinux.h using the bpftool

I will debug it on my end. I am looking for if you can give me some input on the issue.