linux下查看中斷請求記錄。通過cpu的中斷請求的響應，可以看出cpu都在爲哪些設備幹活，乾的活有多少量等信息。
- [~]$ cat /proc/interrupts
- CPU0 CPU1 CPU2 CPU3
- 0: 1383283707 0 0 0 IO-APIC-edge timer
- 1: 3 0 0 0 IO-APIC-edge i8042
- 3: 11 0 0 0 IO-APIC-edge serial
- 8: 1 0 0 0 IO-APIC-edge rtc
- 9: 0 0 0 0 IO-APIC-level acpi
- 12: 4 0 0 0 IO-APIC-edge i8042
- 14: 25 0 0 0 IO-APIC-edge ide0
- 82: 85 0 0 0 IO-APIC-level uhci_hcd:usb5
- 90: 96 0 0 0 IO-APIC-level uhci_hcd:usb6
- 114: 1067499 0 0 0 PCI-MSI-X cciss0
- 130: 96508322 0 0 0 PCI-MSI eth0
- 138: 384295 0 0 0 PCI-MSI eth1
- 169: 0 0 0 0 IO-APIC-level ehci_hcd:usb1, uhci_hcd:usb2
- 177: 0 0 0 0 IO-APIC-level uhci_hcd:usb3
- 185: 0 0 0 0 IO-APIC-level uhci_hcd:usb4
- NMI: 11370 6399 6845 6300
- LOC: 1383174675 1383278112 1383174810 1383277705
- ERR: 0
- MIS: 0
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註釋：
1. 對部分IRQ標識的解釋
Interrupt as in /proc/interrupts Name as it appears in ftrace log
NMI: Non-maskable interrupts : NMI_VECTOR
LOC: Local timer interrupts : LOCAL_TIMER_VECTOR
SPU: Spurious interrupts : SPURIOUS_APIC_VECTOR
PMI: Performance monitoring interrupts : <not added>
PND: Performance pending work : LOCAL_PENDING_VECTOR
RES: Rescheduling interrupts : RESCHEDULE_VECTOR
CAL: Function call interrupts : CALL_FUNCTION_VECTOR or
CALL_FUNCTION_SINGLE_VECTOR
TLB: TLB shootdowns : INVALIDATE_TLB_VECTOR_START to
INVALIDATE_TLB_VECTOR_END
TRM: Thermal event interrupts : THERMAL_APIC_VECTOR
THR: Threshold APIC interrupts : THRESHOLD_APIC_VECTOR
MCE: Machine check exceptions : <not added>
MCP: Machine check polls : <not added>
ERR: : ERROR_APIC_VECTOR
MIS: : <not added>
PLT: Platform interrupts : X86_PLATFORM_IPI_VECTOR
2. IO-APIC-edge timer
此處的timer爲系統定時器.
