Factors that affect dynamic memory allocation

Question

I want to know what are all the factors that affect malloc behavior (or other allocation functions).

Things I know:

1. The vm.overcommit_memory variable.
2. Setting limits for malloc size.
3. 32/64 bit platform.

Thing I assume matter:

1. Different kernel versions?
2. How the OS handles swapping? And the OS itself?

Please correct me if I am wrong and if you know something else please comment down below.

Answer 1

The swapfile size, found in / affects allocation.