Latency measuring infrastructure

modulename: latencytop.ko

configname: CONFIG_LATENCYTOP

Linux Kernel Configuration
└─>Latency measuring infrastructure
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
Enable this option if you want to use the LatencyTOP tool
to find out which userspace is blocking on what kernel operations.

source code: