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we are faced with three major components of the page-fault service time 1 service the page-fault interrupts2 read in the page3 restart the
a page fault causes the following sequence to occur1 trap shut in to the operating system2 save the process registers and process state3 verify that
performance of demand pagingdemand paging can have an important effect on the performance of a computer system as long as there are no page faults
the hardware to support demand paging is as follows page table this table has the skill to mark an entry invalid though a valid-invalid bit or
the procedure for handling the page fault is as follows1 we check the internal table to verify whether the reference was valid or invalid2 if the
basic conceptswhen a process is to be changed in the pager guesses which pages will be used before the process is changed out again instead of
explain about demand paginga demand paging system is same to a paging system with swapping processes reside on secondary memory when we require
what are files and explain the access methods for filesfile definitionattributes operations and typesdirect accesssequential access with diagramother
explain the various page replacement strategiespage replacement-basic scheme with diagramoptimal page replacementlru page replacementfifo page
general graph directorythe serious problem with using an acyclic-graph structure is ensuring that there are no cycles when we insert links to an
acyclic-graph directoriesan acyclic graph permits directories to have shared subdirectories and files the similar file or subdirectory may be in two
what are tree-structured directorieswe can generalize the directory structure to a tree of arbitrary height this permits the user to create their own
what is two-level directoryin the two-level directory structure every user has own user file directory ufd when a user jobs begins or a user logs in
what is single-level directoryall files are constrained in the similar directory which is simple to support and understood one limitation is when the
operations that are to be performed on a directory aresearch for a file we are able to find all files whose names match a exact patterncreate a file
normal 0 false false false en-in x-none x-none microsoftinternetexplorer4
what problems arise if the directory structure is a general graphsearching for a particular file may result in searching the similar directory many
what is a general grapha tree structure where links can go from one branch to a node earlier in the similar branch or other branch allowing
list ways to share files among directories in operating systemsa copy file from one account into anotherb link directory entry of copied file to
what is an acyclic grapha tree that has been corrupted by links to other branches but does not have any cyclic paths in
what is a file path namea list of the subdirectories directories and files we must traverse to reach a file from the root
how do we overcome the disadvantages of the two-level directorygive links from one user directory to another creating path names system files become
what disadvantages are there to this two-level directory without other provisions two users who require cooperating with each other are hampered in
what advantages are there to this two-level directoryusers are isolated from each other users have more freedom in choosing file
what is the mfd ufd how are they relatedmfd is master-file directory which points to the ufds ufd is user-file directory which points to each of