CONFIG_DTL is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Dispatch Trace Log

configname: CONFIG_DTL

Linux Kernel Configuration
└─>Dispatch Trace Log
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
SPLPAR machines can log hypervisor preempt & dispatch events to a
kernel buffer. Saying Y here will enable logging these events,
which are accessible through a debugfs file.

Say N if you are unsure.