Importance

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Abstract

A buffer cache management structure, or metadata, for a computer system such as a NUMA (non-uniform memory access) machine, wherein physical main memory is distributed and shared among separate memories. The memories reside on separate nodes that are connected by a system interconnect. The buffer cache metadata is partitioned into portions that each include a set of one or more management data structures such as hash queues that keep track of disk blocks cached in the buffer cache. Each set of management data structures is stored entirely within one memory. A first process performs operations on the buffer cache metadata by determining, from an attribute of a data block requested by the process, in which memory a portion of the metadata associated with the data block is stored. The process then determines if the memory containing the metadata portion is local to the process. If so, the first process performs the operation. If not, the first process requests that a second process that is local to the memory perform the operation. The second process then performs the operation and notifies the first process of the operation results.

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First Claim