File: //sys/devices/system/cpu/hotplug/states
0: offline
1: threads:prepare
2: perf:prepare
3: perf/x86:prepare
9: x86/mce:dead
11: slub:dead
13: mm/writeback:dead
14: mm/demotion:offline
15: mm/vmstat:dead
16: softirq:dead
21: irq_poll:dead
22: block/softirq:dead
23: block/bio:dead
24: acpi/cpu-drv:dead
26: block/mq:dead
27: fs/buffer:dead
28: printk:dead
29: mm/memctrl:dead
31: lib/percpu_cnt:dead
32: lib/radix:dead
33: mm/page_alloc:pcp
34: net/dev:dead
36: iommu/iova:dead
39: padata:dead
40: random:prepare
41: workqueue:prepare
43: hrtimers:prepare
46: smpcfd:prepare
47: relay:prepare
48: slab:prepare
49: md/raid5:prepare
50: RCU/tree:prepare
59: base/topology:prepare
62: trace/RB:preapre
63: mm/zsmalloc:prepare
64: mm/zswap:prepare
65: mm/zswap_pool:prepare
68: timers:prepare
70: fork:vm_stack_cache
91: cpu:bringup
92: idle:dead
93: ap:offline
94: sched:starting
95: RCU/tree:dying
108: perf/x86:starting
145: smpcfd:dying
148: ap:online
149: cpu:teardown
151: sched:waitempty
152: smpboot/threads:online
154: irq/affinity:online
155: block/mq:online
157: x86/intel/epb:online
158: perf:online
159: perf/x86:online
163: perf/x86/rapl:online
188: lockup_detector:online
189: workqueue:online
190: random:online
191: RCU/tree:online
192: base/cacheinfo:online
193: mm/writeback:online
194: mm/vmstat:online
195: padata:online
196: mm/compaction:online
197: io-wq/online
198: lib/percpu_cnt:online
199: acpi/cpu-drv:online
200: leds/trigger:starting
201: x86/mce:online
202: printk:online
203: trace/hwlat:online
204: trace/osnoise:online
205: platform/x86/turbo_max_3:online
206: x86/msr:online
207: hwmon/coretemp:online
208: swap_slots_cache
224: mm/demotion:online
228: sched:active
229: online