OPERATING SYSTEMS MEMORY MANAGEMENT - WPI

8: MEMORY Management1 Jerry BreecherOPERATING SYSTEMS MEMORY MANAGEMENT8: MEMORY Management2 What Is In This Chapter?Just as processes share the CPU, they also share physical MEMORY . This chapter is about mechanisms for doing that SYSTEM MEMORY Management8: MEMORY Management3 MEMORY MANAGEMENTJust as processes share the CPU, they also share physical MEMORY . This section is about mechanisms for doing that OF MEMORY USAGE:Calculation of an effective address Fetch from instruction Use index offsetExample: ( Here index is a pointer to an address )loop:load register, indexadd 42, registerstore register, indexinc indexskip_equal index, final_addressbranch continue ..8: MEMORY Management4 MEMORY MANAGEMENT The concept of a logical address spacethat is bound to a separate physical address spaceis central to proper MEMORY MANAGEMENT . Logical address generated by the CPU; also referred to as virtual address Physical address address seen by the MEMORY unit Logical and physical addresses are the same in compile-time and load-time address-binding schemes; logical (virtual) and physical addresses differ in execution-time address-binding schemeDefinitions8: MEMORY Management5 MEMORY MANAGEMENTR elocatableMeans that the program image can reside anywhere in physical MEMORY

There's little or no internal fragmentation (the process uses the memory given to it - the size given to it will be a page.) But there can be a great deal of external fragmentation. This is because the memory is constantly being handed cycled between the process and free. LONG TERM SCHEDULING MEMORY MANAGEMENT

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  Memory, External

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