Introduction to Linux Interrupts and CPU SMP Affinity

by Sandeep Krishnan on January 27, 2014

Interrupts are signal that are sent across IRQ (Interrupt Request Line) by a hardware or software.

Interrupts allow devices like keyboard, serial cards and parallel ports to indicate that it needs CPU attention.

Once the CPU receives the Interrupt Request, CPU will temporarily stop execution of running program and invoke a special program called Interrupt Handler or ISR (Interrupt Service Routine).