This is xnu-8019. See this file in:
Directory listing for xnu-8019//osfmk/vm
Makefile
WKdm_new.h
analytics.c
bsd_vm.c
cpm.h
device_vm.c
lz4.c
lz4.h
lz4_assembly_select.h
lz4_constants.h
memory_object.c
memory_object.h
memory_types.h
pmap.h
pmap_cs.h
vm32_user.c
vm_apple_protect.c
vm_compressor.c
vm_compressor.h
vm_compressor_algorithms.c
vm_compressor_algorithms.h
vm_compressor_backing_store.c
vm_compressor_backing_store.h
vm_compressor_pager.c
vm_compressor_pager.h
vm_debug.c
vm_debug.h
vm_external.h
vm_fault.c
vm_fault.h
vm_fourk_pager.c
vm_init.c
vm_init.h
vm_kern.c
vm_kern.h
vm_map.c
vm_map.h
vm_map_store.c
vm_map_store.h
vm_map_store_ll.c
vm_map_store_ll.h
vm_map_store_rb.c
vm_map_store_rb.h
vm_object.c
vm_object.h
vm_options.h
vm_page.h
vm_pageout.c
vm_pageout.h
vm_phantom_cache.c
vm_phantom_cache.h
vm_protos.h
vm_purgeable.c
vm_purgeable_internal.h
vm_resident.c
vm_shared_region.c
vm_shared_region.h
vm_shared_region_pager.c
vm_swapfile_pager.c
vm_tests.c
vm_user.c