File: //sys/devices/system/cpu/hotplug/states
0: offline
1: threads:prepare
7: x86/mce:dead
10: slub:dead
12: mm/writeback:dead
13: mm/vmstat:dead
14: softirq:dead
19: irq_poll:dead
20: block/softirq:dead
21: block/bio:dead
22: acpi/cpu-drv:dead
24: block/mq:dead
25: fs/buffer:dead
26: printk:dead
27: mm/memctrl:dead
28: lib/percpu_cnt:dead
29: lib/radix:dead
30: mm/page_alloc:pcp
31: net/dev:dead
33: iommu/iova:dead
35: padata:dead
37: random:prepare
38: workqueue:prepare
40: hrtimers:prepare
42: smpcfd:prepare
43: relay:prepare
45: RCU/tree:prepare
49: x86/xen/guest:prepare
50: xen/evtchn:prepare
53: base/topology:prepare
56: trace/RB:prepare
60: timers:prepare
61: tmigr:prepare
63: fork:vm_stack_cache
64: crash/cpuhp
84: cpu:kick_ap
85: cpu:bringup
86: idle:dead
87: ap:offline
88: x86/cachectrl:starting
89: sched:starting
90: RCU/tree:dying
140: smpcfd:dying
141: hrtimers:dying
142: tick:dying
145: ap:online
146: cpu:teardown
150: sched:waitempty
151: smpboot/threads:online
152: irq/affinity:online
153: block/mq:online
156: perf:online
187: tmigr:online
188: lockup_detector:online
189: workqueue:online
190: random:online
191: RCU/tree:online
192: kthreads:online
193: base/cacheinfo:online
194: x86/xen/guest:online
195: mm/writeback:online
196: mm/vmstat:online
197: padata:online
198: io-wq/online
199: topology/cpu-capacity
200: x86/msr:online
201: x86/cpuid:online
202: lib/percpu_cnt:online
203: acpi/cpu-drv:online
204: AP_PERF_CXL_PMU_ONLINE
205: x86/mce:online
206: printk:online
207: trace/hwlat:online
208: trace/osnoise:online
209: platform/x86/turbo_max_3:online
237: sched:active
238: online