Operating System (OS)
A critical region is

a program segment that has not been proved bug-free
a program segment where shared resources are accessed
one which is enclosed by a pair of P and V operations on semaphores
none is the above
a program segment that often causes unexpected system crashes

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Operating System (OS)
Page stealing

Is taking layer disk space for page in page out
Should be the turning goal
Is taking page frame from other working sets
Is a sign of an efficient system

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