FM / format

/sys/devices/cpu/format

Name	Size	Mode	Actions
any	4096	0444	edit dl rm
cmask	4096	0444	edit dl rm
edge	4096	0444	edit dl rm
event	4096	0444	edit dl rm
inv	4096	0444	edit dl rm
ldlat	4096	0444	edit dl rm
offcore_rsp	4096	0444	edit dl rm
pc	4096	0444	edit dl rm
umask	4096	0444	edit dl rm

Edit: /sys/devices/cpu/format/event (4096B)

config:0-7