page fault

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Windows XP (cont.)A process may be assigned as many pages up to its workingset maximum. < working-set max : page faults →allocation from free pages. >= working set max: page faults →local page replacementWhen the amount of free memory in the system falls below athreshold, automatic working set trimming is performed torestore the amount of free memory.Working set trimming removes pages from processes that havepages in excess of their working set minimum.
SolarisMaintains a list of free pages to assign faulting processesLotsfree – threshold parameter (amount of free memory) to beginpagingDesfree – threshold parameter to increasing pagingMinfree – threshold parameter to being swappingPaging is performed by pageout process
Page 5 and 6:
Virtual-address Space
Page 7 and 8:
Demand PagingBring a page into memo
Page 9 and 10:
Valid-Invalid BitWith each page tab
Page 11 and 12:
Page Fault If there is a reference
Page 13 and 14: Performance of Demand Paging Page F
Page 15 and 16: Copy-on-WriteCopy-on-Write (COW) al
Page 17 and 18: After Process 1 Modifies Page C
Page 19 and 20: Page ReplacementPrevent over-alloca
Page 21 and 22: Basic Page Replacement1. Find the l
Page 23 and 24: Page Replacement Algorithms Want lo
Page 25 and 26: First-In-First-Out (FIFO) Algorithm
Page 27 and 28: FIFO Illustrating Belady’s Anomal
Page 29 and 30: Optimal Page Replacement
Page 31 and 32: LRU Page Replacement
Page 33 and 34: LRU Approximation AlgorithmsReferen
Page 35 and 36: Enhanced Second-Chance Additional m
Page 37 and 38: Allocation of FramesEach process ne
Page 39 and 40: Priority Allocation Use a proportio
Page 41 and 42: ThrashingIf a process does not have
Page 43 and 44: Demand Paging and Thrashing Why doe
Page 45 and 46: Working-Set Model working-set wind
Page 47 and 48: Page-Fault Frequency SchemeEstablis
Page 49 and 50: Memory-Mapped FilesMemory-mapped fi
Page 51 and 52: Memory Mapped Files
Page 53 and 54: Buddy System Allocator
Page 55 and 56: Slab Allocation
Page 57 and 58: Page Size Page size selection must
Page 59 and 60: Program StructureProgram structure
Page 61 and 62: Reason Why Frames Used For I/O Must
Page 63: Windows XPUses demand paging with c
Page 67 and 68: Solaris 2 Page Scanner
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page fault

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