CONFIG_CMM is not available for thedefaultarchitecture x86.
Result is shown for architecture s390

Cooperative memory management

modulename: cmm.ko

configname: CONFIG_CMM

Linux Kernel Configuration
└─>Cooperative memory management
In linux kernel since version 2.6.12  
Select this option, if you want to enable the kernel interface
to reduce the memory size of the system. This is accomplished
by allocating pages of memory and put them "on hold". This only
makes sense for a system running under VM where the unused pages
will be reused by VM for other guest systems. The interface
allows an external monitor to balance memory of many systems.
Everybody who wants to run Linux under VM should select this

source code: