Memory Controller Feedback for Write Amplification Invalidation
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Solution Overview
Problem
Existing memory sub-systems face inefficiencies due to increased write amplification penalties when invalidating data, particularly when multiple virtual memory groups are associated with a single physical memory component, leading to unnecessary resource waste and reduced efficiency.
Innovation Solution
A memory controller coordinates with the host to provide information on write amplification penalties for virtual memory groups, allowing the host to selectively control and decide when to invalidate data, thereby avoiding unnecessary re-writing and optimizing data storage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple virtual memory groups are associated with a single physical memory component, then memory utilization and flexibility are improved, but write amplification penalty increases
Solution Approach 1:
The patent segments the association between virtual memory groups and physical memory components by introducing selective invalidation capabilities. Instead of treating the association as a fixed many-to-many relationship, the system divides it into independent invalidation decisions for each virtual memory group, allowing the host to invalidate individual groups without triggering cascading writes across all groups sharing the same physical component.
Solution Approach 2:
The patent applies partial action by allowing the host to invalidate only specific virtual memory groups rather than requiring invalidation of all groups associated with a physical component. This partial invalidation approach reduces the write amplification penalty by avoiding unnecessary re-writing of valid data in other virtual memory groups that share the same physical memory component.
2Ease of operation
If the host invalidates data without knowing write amplification penalty, then operation simplicity is maintained, but resource waste increases
Solution Approach 1:
The patent introduces a feedback mechanism where the memory sub-system provides write amplification penalty information to the host before invalidation operations. This feedback enables the host to make informed decisions about which virtual memory groups to invalidate, balancing operational simplicity with resource efficiency by allowing selective invalidation based on penalty costs.
Solution Approach 2:
The patent applies preliminary action by providing write amplification penalty information to the host before the actual invalidation operation occurs. This advance information allows the host to plan and optimize invalidation sequences, choosing to invalidate virtual memory groups with lower penalties first or avoiding invalidation of groups that would trigger excessive re-writing.
3Reliability
If unnecessary re-writing is performed during data invalidation, then data integrity is maintained, but productivity decreases
Solution Approach 1:
The patent introduces dynamics by making the invalidation process adaptive rather than static. The host can dynamically adjust invalidation decisions based on real-time or historical write amplification penalty information, optimizing the balance between maintaining data integrity and preserving productivity. The system transitions from fixed invalidation behavior to flexible, penalty-aware invalidation strategies.
Data Source
AI summary
Aspects of the present disclosure configure a memory sub-system controller to inform a host about write amplification penalty for host invalidations. The controller generates a virtual memory group comprising a portion of a memory component of a set of memory components. The controller computes a write amplification penalty associated with invalidating data associated with the virtual memory group. The controller communicates, to a host, information about the write amplification penalty associated with invalidating data associated with the virtual memory group. The controller receives, from the host, a request to invalidate data associated with the virtual memory group, the request being generated by the host based on the write amplification penalty.