On Wed, 15 Jan 2020 18:23:05 +0530, Anupam Kapoor said:
> On Wed, 15 Jan 2020 at 6:02 PM Sumit Kumar <sumit686215@gmail.com> wrote:
> > 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 ?
> would madvise not serve your needs ?

There's this word "force" in the question.

The problem is that madvise() is *advice* to the kernel, not a strict
guarantee.  There's a difference between "If you need to move pages
to disk, consider these pages first" and "Move them to disk now, whether
you really wanted to or not".