physical memory allocated to a program

hello everyone,
presently i was reading about physical memory allocators and wanted
to know ,as the size entry of the program( the size of the program in
directory entry) includes the size of the code of the program and not
that of the dynamic memory which that program may require(as i
think) ,so how does the kernel or the allocater decides what block of
memory should be actually allocated to the program(which will also
include the dynamic memory which may be required by the program beside
the memory required for its code.
mohan
.

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