Resource Manager for Hot-Plugged Device Allocation
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Solution Overview
Problem
Conventional resource allocation systems in computer systems often fail to provide sufficient resources to hot-plugged devices, leading to suboptimal operation, as they do not effectively re-allocate resources from existing devices or their parent nodes when the required resources are not available.
Innovation Solution
A resource manager is implemented to probe both parent and upper-level device nodes for available resources, re-allocate them, and update properties to ensure the hot-plugged device receives the necessary resources, such as I/O addresses and memory addresses, by generating a linked list to track resource reassignment across the device tree.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resource allocation systems allocate resources only from reserved pools at parent nodes, then resource allocation is simple and fast, but hot-plugged devices cannot receive sufficient resources when the reserved pool is exhausted
Solution Approach 1:
The resource allocation system is segmented into multiple levels (parent nodes and upper-level nodes), allowing the resource manager to probe and allocate resources from different hierarchical levels. This segmentation enables the system to access a broader resource pool while maintaining structured management through the device tree hierarchy.
Solution Approach 2:
The system transitions from a single-dimension resource pool (only at immediate parent node) to a multi-dimensional resource allocation approach by probing upper-level nodes in the device tree hierarchy. This adds a vertical dimension to resource access, enabling allocation from grandparent nodes and other ancestors when parent node resources are insufficient.
2Adaptability or versatility
If resources are re-allocated from existing devices and upper-level nodes, then hot-plugged devices receive sufficient resources, but the system requires complex probing and resource tracking mechanisms
Solution Approach 1:
The system performs preliminary probing of upper-level nodes and existing devices to identify available resources before final allocation to the hot-plugged device. This advance preparation ensures that resources are verified and ready for allocation, reducing allocation failures while maintaining adaptability.
Solution Approach 2:
The resource manager implements feedback mechanisms by continuously monitoring resource availability across the device tree hierarchy and updating allocation decisions based on current system state. This feedback loop enables dynamic adaptation to changing resource conditions while managing complexity through systematic resource tracking.
3Quantity of substance
If the system probes upper-level device nodes for resources, then resource availability increases, but the probing process time increases
Solution Approach 1:
The resource manager performs partial probing by first checking immediate parent nodes for available resources before proceeding to probe upper-level nodes. This staged approach minimizes unnecessary probing operations and reduces allocation time when resources are readily available at lower levels, while still ensuring resource availability when needed.
Data Source
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AI summary
In at least one embodiment, an apparatus for providing resources from a plurality of on-board device nodes to a hot-plugged device node in a computer is provided. The apparatus comprises a resource manager configured to receive a resource request over a bus system indicative of a set of desired resources from the hot-plugged device node. The resource manage is further configured to probe a parent device and at least one upper level device node positioned above the parent device node for the set of desired resources. The resource manager is further configured to provide the set of desired resources from the parent device node and one or more nodes of the at least one upper level device node over the bus system for transmission to the hot-plugged device node to enable the hot-plugged device node to operate in the intended manner.