Buffer caches are created in main memory and managed by the operating system to avoid the latencies associated with the accesses made by the system call to the secondary storage devices. Changes in cache size or architecture are the methods used to improve the cache performance. Use of a single policy cannot adapt to changing workloads. Non detection based policies cannot utilize the reference regularities and suffer from cache pollution and thrashing. Cache Access Pattern (CAP), is a policy that detects patterns, at the file and program context level, in the references issued to the buffer cache blocks.
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