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This directory is used to set IRQ to CPU affinity, which allows the system to connect a particular IRQ to only one CPU. Alternatively, it can exclude a CPU from handling any IRQs.
Each IRQ has its own directory, allowing for the individual configuration of each IRQ. The
/proc/irq/prof_cpu_maskfile is a bitmask that contains the default values for the
smp_affinityfile in the IRQ directory. The values in
smp_affinityspecify which CPUs handle that particular IRQ.
For more information about the
/proc/irq/directory, see the following installed documentation: