Contiguous Memory Allocator

modulename: cma.ko

configname: CONFIG_CMA

Linux Kernel Configuration
└─>Memory Management options
└─>Contiguous Memory Allocator
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This enables the Contiguous Memory Allocator which allows other
subsystems to allocate big physically-contiguous blocks of memory.
CMA reserves a region of memory and allows only movable pages to
be allocated from it. This way, the kernel can use the memory for
pagecache and when a subsystem requests for contiguous area, the
allocated pages are migrated away to serve the contiguous request.

If unsure, say "n".

source code: