r0 = openat(0xffffffffffffff9c, &(0x7f0000000280)='./cgroup.cpu/cgroup.procs\x00', 0x0, 0x0)
preadv(r0, &(0x7f0000000000)=[{&(0x7f0000000180)=""/159, 0x9f}], 0x1, 0x63, 0x0)