File: //sys/devices/system/cpu/hotplug/states
0: offline
1: threads:prepare
2: perf:prepare
10: x86/mce:dead
11: virtio/net:dead
12: slub:dead
13: mm/writeback:dead
14: mm/vmstat:dead
15: softirq:dead
20: irq_poll:dead
21: block/softirq: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:dead
31: net/dev:dead
35: workqueue:prepare
37: hrtimers:prepare
40: smpcfd:prepare
41: relay:prepare
42: slab:prepare
43: md/raid5:prepare
44: RCU/tree:prepare
53: base/topology:prepare
56: trace/RB:preapre
57: mm/zsmalloc:prepare
58: mm/zswap:prepare
59: mm/zswap_pool:prepare
62: timers:dead
64: fork:vm_stack_cache
85: cpu:bringup
86: idle:dead
87: ap:offline
88: sched:starting
89: RCU/tree:dying
131: smpcfd:dying
133: ap:online
134: cpu:teardown
136: smpboot/threads:online
137: x86/vdso/vma:online
138: irq/affinity:online
139: perf:online
144: perf/x86/rapl:online
161: workqueue:online
162: RCU/tree:online
163: base/cacheinfo:online
164: x86/kvm:online
165: mm/writeback:online
166: mm/vmstat:online
167: mm/compaction:online
168: padata:online
169: mm/vmscan:online
170: lib/percpu_cnt:online
171: acpi/cpu-drv:online
172: leds/trigger:starting
173: x86/mce:online
174: printk:online
175: virtio/net:online
197: sched:active
198: online