1) I think I understand notability criteria well and that's orthogonal to my editing habits.
2) Please show specific parts of WP:N that are being violated.
2) I do not say that Memory management in C should contain only malloc. It will include whatever WP:RS say Dynamic memory allocation in C means, including realloc, free, calloc. Thus there are no issues with scope. 
3) The following two WP:RS establish notability and remove any doubts of WP:OR for Dynamic memory allocation in C: S.G.Ganesh - Dynamic Memory Allocation in C, Dr. M.K. Sharma, Dr. M.P. Thapliyal - Concept of Computer and C Programming.