File: //sys/devices/system/cpu/hotplug/states
0: offline
1: threads:prepare
2: perf:prepare
3: perf/x86:prepare
8: x86/mce:dead
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
44: smpcfd:prepare
45: relay:prepare
46: md/raid5:prepare
47: RCU/tree:prepare
55: base/topology:prepare
58: trace/RB:prepare
59: mm/zsmalloc:prepare
63: timers:prepare
65: kvmclock:setup_percpu
66: fork:vm_stack_cache
67: crash/cpuhp
86: cpu:kick_ap
87: cpu:bringup
88: idle:dead
89: ap:offline
90: x86/cachectrl:starting
91: sched:starting
92: RCU/tree:dying
105: perf/x86:starting
138: smpcfd:dying
139: hrtimers:dying
142: ap:online
143: cpu:teardown
147: sched:waitempty
148: smpboot/threads:online
149: irq/affinity:online
150: block/mq:online
153: perf:online
154: perf/x86:online
185: lockup_detector:online
186: workqueue:online
187: random:online
188: RCU/tree:online
189: base/cacheinfo:online
190: x86/kvm:online
191: mm/writeback:online
192: mm/vmstat:online
193: padata:online
194: pci/amd_bus:online
195: mm/compaction:online
196: io-wq/online
197: lib/percpu_cnt:online
198: acpi/cpu-drv:online
199: virtio/net:online
200: leds/trigger:starting
201: x86/mce:online
202: printk:online
203: trace/hwlat:online
204: trace/osnoise:online
205: x86/msr:online
206: swap_slots_cache
207: x86/cpuid:online
233: sched:active
234: online