Where is ContextSwitch Variable?

[qfettes]

After running the command
m2s --x86-config-help
the description for ContextQuantum reads:

ContextQuantum = (Default = 100k)
If ContextSwitch is true, maximum number of cycles that a context can occupy
a Cpu hardware thread before it is replaced by other pending context.

However, there is no description for the ContextSwitch variable. Where is this variable placed? Why is its description missing/removed? Thanks in advance for the help.

[ghost]

It is delete from the source code. These usage descriptions didn't change since version 4.2, in version 4.2 this should work. Also you can try to add the missing code in src/arch/x86/timing/Cpu.cc, but I guess it is still not work.