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From: http://sourceware.org/systemtap/wiki/WSKernelProfile

# stap pf2.stp

--- 109 samples recorded:
mwait_idle      71
check_poison_obj        4
_spin_unlock_irqrestore 2
dbg_redzone1    1
kfree   1
kmem_cache_free 1
_spin_unlock_irq        1
end_buffer_write_sync   1
lock_acquire    1

--- 108 samples recorded:
mwait_idle      91
check_poison_obj        3
_spin_unlock_irq        2
delay_tsc       1