/proc/self/root/proc/thread-self/root/proc/self/root/sys/devices/system/cpu/hotplug
This explorer reads the filesystem of the server it runs on, so /workspace/user isn't present here. Browsing and the terminal still work against this server's own disk from /.
0: offline 1: threads:prepare 2: perf:prepare 9: virtio/net:dead 11: slub:dead 13: mm/writeback:dead 14: mm/vmstat:dead 15: softirq:dead 20: irq_poll:dead 21: block/softirq:dead 22: block/bio:dead 23: acpi/cpu-drv:dead 25: block/mq:dead 26: fs/buffer:dead 27: printk:dead 28: mm/memctrl:dead 29: lib/percpu_cnt:dead 30: lib/radix:dead 31: mm/page_alloc:pcp 32: net/dev:dead 34: iommu/iova:dead 36: padata:dead 38: random:prepare 39: workqueue:prepare 41: hrtimers:prepare 43: smpcfd:prepare 44: relay:prepare 46: RCU/tree:prepare 54: base/topology:prepare 62: timers:prepare 65: kvmclock:setup_percpu 66: fork:vm_stack_cache 86: cpu:kick_ap 87: cpu:bringup 88: idle:dead 89: ap:offline 90: x86/cachectrl:starting 91: sched:starting 92: RCU/tree:dying140: smpcfd:dying141: hrtimers:dying142: tick:dying145: ap:online146: cpu:teardown150: sched:waitempty151: smpboot/threads:online152: irq/affinity:online153: block/mq:online156: perf:online161: perf/x86/rapl:online188: lockup_detector:online189: workqueue:online190: random:online191: RCU/tree:online192: base/cacheinfo:online193: x86/kvm:online194: mm/writeback:online195: mm/vmstat:online196: padata:online197: mm/compaction:online198: io-wq/online199: x86/msr:online200: x86/cpuid:online201: lib/percpu_cnt:online202: acpi/cpu-drv:online203: virtio/net:online204: printk:online236: sched:active237: online