This is the error: ``` # bpf-cpufreq failed to open '/sys/devices/system/cpu/cpu12/cpufreq/scaling_cur_freq': No such file or directory failed to init freqs ``` ``` bpf-opensnoop --name=bpf-cpufreq PID COMM FD ERR PATH 49029 bpf-cpufreq 3 0 /etc/ld.so.cache 49029 bpf-cpufreq 3 0 /lib64/libelf.so.1 49029 bpf-cpufreq 3 0 /lib64/libz.so.1 49029 bpf-cpufreq 3 0 /lib64/libc.so.6 49029 bpf-cpufreq 3 0 /lib64/libzstd.so.1 49029 bpf-cpufreq 3 0 /sys/devices/system/cpu/possible 49029 bpf-cpufreq 3 0 /sys/kernel/btf/vmlinux 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu2/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu3/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu4/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu5/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu6/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu7/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu8/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu9/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu10/cpufreq/scaling_cur_freq 49029 bpf-cpufreq 9 0 /sys/devices/system/cpu/cpu11/cpufreq/scaling_cur_freq 49029 bpf-cpufreq -1 2 /sys/devices/system/cpu/cpu12/cpufreq/scaling_cur_freq ``` ``` # cat /sys/devices/system/cpu/possible 0-31 ``` ``` inxi --cpu --system -z System: Kernel: 6.3.8-200.fc38.x86_64 arch: x86_64 bits: 64 Console: pty pts/1 Distro: Fedora release 38 (Thirty Eight) CPU: Info: 6-core model: AMD Ryzen 5 5600G with Radeon Graphics bits: 64 type: MT MCP cache: L2: 3 MiB Speed (MHz): avg: 1608 min/max: 1400/4464 cores: 1: 1400 2: 3900 3: 1400 4: 1400 5: 1400 6: 1400 7: 1400 8: 1400 9: 1400 10: 1400 11: 1400 12: 1400 ``` It looks to me that the tool should be using /sys/devices/system/cpu/present https://github.com/torvalds/linux/blob/master/Documentation/admin-guide/cputopology.rst > present: CPUs that have been identified as being present in the system [cpu_present_mask] Reproducible: Always Steps to Reproduce: 1.sudo bpf-cpufreq 2. 3. Actual Results: failed to open '/sys/devices/system/cpu/cpu12/cpufreq/scaling_cur_freq': No such file or directory Expected Results: CPU frequencies
I submitted it as well on the bcc project itself: https://github.com/iovisor/bcc/issues/4651
This should get fixed by the rebase to bcc-0.28.0