c - Virtual Memory allocation without Physical Memory allocation -


i'm working on linux kernel project , need find way allocate virtual memory without allocating physical memory. example if use :

char* buffer = my_virtual_mem_malloc(sizeof(char) * 512);

my_virtual_mem_malloc new syscall implemented kernel module. data written on buffer stocked on file or on other server using socket (not on physical memory). complete job, need request virtual memory , access vm_area_struct structure redefine vm_ops struct.

do have ideas ?

thx

this not architecturally possible. can create vm areas have writeback routine copies data somewhere, @ level, must allocate physical pages written to.

if you're okay that, can write fuse driver, mount somewhere, , mmap file it. if you're not, you'll have write(), because redirecting writes without allocating physical page at all not supported x86, @ least.


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