SYSTEM INTERRUPTS
The proc/interrupts file in Android kernel is used to
record the number of interrupts per CPU which can be used
as a reference to track back the source that wake CPUs up.
The file includes both external and internal interrupts to the
system. External interrupts come from IO devices. Internal
interrupts are requested mainly from NMI (nonmaskable
interrupt), LOC (local timer interrupt), TLB (TLB flush
interrupt), RES (rescheduling interrupt), and CAL (remote
function call interrupt).