On Tue, 21 Dec 2021, 15:36 Sadanand Warrier, <sadanandwarrier@gmail.com> wrote:
Hello
    Is CMA still supported as described in this document

Yes, it is.

Read the following instructions on how to use that feature:

"A deep dive into CMA" at 
https://lwn.net/Articles/486301/

Regards,

Fabio M. De Francesco