CONFIG_OCTEON_ILM is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

Module to measure interrupt latency using Octeon CIU Timer

modulename: oct_ilm.ko

configname: CONFIG_OCTEON_ILM

Linux Kernel Configuration
└─>Module to measure interrupt latency using Octeon CIU Timer
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This driver is a module to measure interrupt latency using the
the CIU Timers on Octeon.

To compile this driver as a module, choose M here. The module
will be called octeon-ilm

source code: