Why does per_cpu directory of tracing show more number of cpuN directories then actual online cpus?
Issue
- Why does per_cpu directory of tracing show more number of cpuN directories then actual online cpus?
- There are actually just 4 CPU on the server but there are 128 cpu's listed under /sys/kernel/debug/tracing/per_cpu/, why?
# ll -d /sys/kernel/debug/tracing/per_cpu/*|wc -l
128
# cat /sys/devices/system/cpu/online
0-3
Environment
- Vmware guest
- kvm guest
- physical hardware with hotplug enabled.
- RHEL7 and RHEL8
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