add radix kmem_cache_t  to mapping
add shrink_zone function which drop mapping all pages not to swap
add free_zone function
Merge branch 'master' of github.com:softirq/libmm into mushroom
add idle thread for check global memory free page level and options
add page mlock feature
add brk and mmap for memory malloc
Merge branch 'master' of github.com:softirq/libmm into mushroom
add test malloc