Memory Fragmentation Management in Real-Time Embedded Systems

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Solution Overview

Problem

Real-time embedded systems face challenges in efficiently managing memory due to limited resources, as traditional garbage collection methods are not suitable for systems requiring quick responses and multitasking, especially when memory is consumed or fragmented.

Innovation Solution

A memory management apparatus and method that utilize a defragmentation unit to prioritize memory defragmentation tasks based on fragmentation rates, allowing for real-time memory allocation and deallocation while adjusting priorities according to changing memory conditions to optimize memory usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If garbage collection is performed whenever data varies, then memory is kept clean and organized, but system responsiveness deteriorates due to frequent interruptions

Engineering Contradiction:

Improvememory organizationVSAvoidsystem responsiveness

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements periodic garbage collection at predetermined time intervals rather than continuously or on every data change. The memory management apparatus schedules defragmentation tasks to run periodically, balancing memory maintenance with system responsiveness by collecting garbage only at specific intervals when it least impacts real-time operations.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent dynamically adjusts the garbage collection schedule based on system conditions. The memory management apparatus monitors memory usage patterns and system load, adapting the timing and frequency of defragmentation tasks to match actual needs, thereby optimizing both memory organization and system responsiveness under varying conditions.

Inventive Principle:

Principle #15Dynamics

2Loss of time

If garbage collection is performed only in idle mode, then system responsiveness is maintained, but memory organization deteriorates in multitasking systems

Engineering Contradiction:

Improvesystem responsivenessVSAvoidmemory organization

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent performs preliminary defragmentation actions during idle periods or low-load conditions to prepare memory for future operations. By proactively organizing memory before it becomes fragmented, the system maintains responsiveness while preventing memory degradation that would occur if only reactive collection were used.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The memory management apparatus continuously monitors memory fragmentation levels and system state, using this feedback to determine when and how aggressively to perform garbage collection. This closed-loop control ensures memory organization is maintained without unnecessarily interrupting real-time operations.

Inventive Principle:

Principle #23Feedback

3Reliability

If memory defragmentation is performed frequently, then memory fragmentation is reduced, but system productivity deteriorates due to task interruptions

Engineering Contradiction:

Improvememory fragmentationVSAvoidsystem throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies partial defragmentation actions that collect only a portion of available garbage during each execution rather than performing complete memory reorganization. This approach gradually reduces fragmentation over multiple passes without causing prolonged system interruptions, maintaining productivity while improving memory health.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system schedules defragmentation tasks periodically with appropriate intervals between executions. This periodic approach allows the system to balance fragmentation reduction with productivity by spreading defragmentation work across multiple time slots rather than concentrating it in single lengthy operations.

Inventive Principle:

Principle #19Periodic action

4Productivity

If memory defragmentation is performed rarely, then system productivity is maintained, but memory fragmentation increases reducing allocation efficiency

Engineering Contradiction:

Improvesystem throughputVSAvoidmemory allocation efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary defragmentation during idle periods or between task executions to proactively maintain memory allocation efficiency. By keeping memory organized in advance, the system ensures that when allocation requests occur, memory can be quickly and efficiently assigned without degradation from fragmentation.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8051265B2Apparatus for managing memory in real-time embedded system and method of allocating, deallocating and managing memory in real-time embedded system

Publication Date: 2011.11.01 SAMSUNG ELECTRONICS CO LTD

AI summary

An apparatus for managing memory in a real-time embedded system and a method of allocating, deallocating and managing memory in a real-time embedded system. The apparatus includes a defragmentation unit performing a defragmentation task according to a predetermined priority to collect together memory fragments, and a memory manager allocating or deallocating a predetermined area of memory upon request of a task, and calculating a memory fragmentation rate of the memory to determine a priority of the defragmentation task. The method of managing memory in a real-time embedded system includes determining whether the conditions under which the memory is used vary, and if the condition vary, calculating a memory fragmentation rate of the memory to determine a priority of the defragmentation task according to the memory fragmentation rate.