Memory Controller Map Segment Locking for Cache Reload Overhead

The patent applies preliminary action by proactively identifying map segments that are likely to be needed for future mapping table updates and setting lock flags on them in advance. This prevents eviction of these segments before they are needed, eliminating the reloading overhead that would occur if they were evicted. The memory controller analyzes command patterns and selectively locks segments before they are required, thus resolving the contradiction between fast retrieval and avoiding reload overhead.

The patent applies local quality by selectively setting lock flags on specific map segments based on their individual characteristics and usage patterns, rather than uniformly locking all segments. The memory controller identifies segments that are likely to be updated and locks only those segments, leaving other segments available for caching. This localized approach reduces reloading overhead for critical segments while maintaining cache availability for other segments, thus resolving the contradiction between reducing reload overhead and maintaining caching performance.

The patent applies parameter changes by using simple, quantifiable metrics such as the ratio of write commands to total commands and the number of times logical addresses are referenced. These parameters are easily measurable and can be used to make locking decisions without complex analysis. The memory controller monitors these parameters and adjusts lock flag settings accordingly, reducing reloading overhead through simple parameter-based decisions rather than complex control logic, thus resolving the contradiction between reducing reload overhead and maintaining simple device complexity.