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what functions a memory manager shoud have?

you need a physical memory management, virtual one, it need to take care of anything about aloc/dealoc/ memory in your O.S example malloc.

a user program need some block of extra memory.

then you need to alocate it. and when that program doesn?t need anymore, it ask your o.s system call to dealoc that block. then again you memory management need to free/dealoc that block,

I hope I had help you... sorry my english is so poor.

thanks
My english is poor too...