Transcription of OPERATING SYSTEMS MEMORY MANAGEMENT - WPI
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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 .
8: Memory Management 11 Dynamic loading + Routine is not loaded until it is called + Better memory-space utilization; unused routine is never loaded. + Useful when large amounts of code are needed to handle infrequently occurring cases. + No special support from the OS is required - implemented through program design. Dynamic Linking
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