linux下查看中断请求记录 IRQ
linux下查看中断请求记录。通过cpu的中断请求的响应，可以看出cpu都在为哪些设备干活，干的活有多少量等信息。
[~]$ cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 1383283707 0 0 0 IO-APIC-edgetimer1: 3 0 0 0 IO-APIC-edgei80423: 11 0 0 0 IO-APIC-edgeserial8: 1 0 0 0 IO-APIC-edgertc9: 0 0 0 0 IO-APIC-levelacpi 12: 4 0 0 0 IO-APIC-edgei8042 14: 25 0 0 0 IO-APIC-edgeide0 82: 85 0 0 0 IO-APIC-leveluhci_hcd:usb5 90: 96 0 0 0 IO-APIC-leveluhci_hcd:usb6114: 1067499 0 0 0 PCI-MSI-Xcciss0130: 96508322 0 0 0 PCI-MSIeth0138: 384295 0 0 0 PCI-MSIeth1169: 0 0 0 0 IO-APIC-levelehci_hcd:usb1, uhci_hcd:usb2177: 0 0 0 0 IO-APIC-leveluhci_hcd:usb3185: 0 0 0 0 IO-APIC-leveluhci_hcd:usb4NMI: 11370 6399 6845 6300 LOC: 1383174675 1383278112 1383174810 1383277705 ERR: 0MIS: 0 ---------------------------------------------------------------------------------------------------------
注释：
1. 对部分IRQ标识的解释
Interrupt as in /proc/interrupts Name as it appears in ftrace logNMI: Non-maskable interrupts : NMI_VECTORLOC: Local timer interrupts : LOCAL_TIMER_VECTORSPU: Spurious interrupts : SPURIOUS_APIC_VECTORPMI: Performance monitoring interrupts : <not added>PND: Performance pending work : LOCAL_PENDING_VECTORRES: Rescheduling interrupts : RESCHEDULE_VECTORCAL: Function call interrupts : CALL_FUNCTION_VECTOR or CALL_FUNCTION_SINGLE_VECTORTLB: TLB shootdowns : INVALIDATE_TLB_VECTOR_START to INVALIDATE_TLB_VECTOR_ENDTRM: Thermal event interrupts : THERMAL_APIC_VECTORTHR: Threshold APIC interrupts : THRESHOLD_APIC_VECTORMCE: Machine check exceptions : <not added>MCP: Machine check polls : <not added>ERR: : ERROR_APIC_VECTORMIS: : <not added>PLT: Platform interrupts : X86_PLATFORM_IPI_VECTOR2. IO-APIC-edge timer
此处的timer为系统定时器.
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