transfer physical memory page to swap disk

Hi, Does C/C++ provide any API / system call that enables user to force the application to transfer some its physical pages to swap disk ? If so, is it also possible to obtain the least used page using some API ? AFAIK, linux kernel is supposed to do this as part of memory management. I want to know if the kernel also exposes some API to enable users to control their application's memory management. I have many applications running at a time that cause too much memory consumption. I believe that experimenting with memory management can help. -- Thanks and Regards, Sumit