Before:
      # procstat -kka|egrep "(idle:|procstat)"
         11 100003 idle             idle: cpu0       <running>
         11 100004 idle             idle: cpu1       mi_switch+0x275 critical_exit+0x8b sched_idletd+0x1e8 fork_exit+0x84 fork_trampoline+0xe
       5167 100172 procstat         -                <running>

 After:
      # procstat -kka|egrep "(idle:|procstat)"
         11 100003 idle             idle: cpu0       stack_hardclock+0xc2 hardclock_cnt+0x2d5 handleevents+0xbc timercb+0x208 lapic_handle_timer+0x9c Xtimerint+0x8c acpi_cpu_idle+0x13b cpu_idle_acpi+0x3f cpu_idle+0x93 sched_idletd+0x1e8 fork_exit+0x84 fork_trampoline+0xe
         11 100004 idle             idle: cpu1       mi_switch+0x275 critical_exit+0x8b sched_idletd+0x1e8 fork_exit+0x84 fork_trampoline+0xe
       1141 100143 procstat         -                stack_save_thread+0x1e1 sysctl_kern_proc_kstack+0x21a sysctl_root+0x1bd userland_sysctl+0x19e sys___sysctl+0x74 amd64_syscall+0x2c3 Xfast_syscall+0xfb