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PERFCOUNTER_CPU( irqs,         "#interrupts" )
PERFCOUNTER_CPU( irq_time,     "cycles spent in irq handler" )

PERFCOUNTER( blockio_tx, "block io: messages received from tx queue" )
PERFCOUNTER( blockio_rx, "block io: messages sent on rx queue" )

PERFCOUNTER_CPU( apic_timer,    "apic timer interrupts" )
PERFCOUNTER_CPU( ac_timer_max,  "ac_timer max error" )