CONFIG_CONTEXT_SWITCH_TRACER (not configurable)

modulename: trace_sched_switch.ko

configname: CONFIG_CONTEXT_SWITCH_TRACER

Linux Kernel Configuration
└─>Kernel hacking
└─>CONTEXT_SWITCH_TRACER
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
source code:
kernel/trace/trace_sched_switch.c