Page Cache Management for Foreground Application Prioritization
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Solution Overview
Problem
Conventional page cache management systems fail to provide resource priority to multiple foreground applications, leading to performance degradation in multi-user and multi-display environments where several applications operate simultaneously, as they do not differentiate between foreground and background applications during the page demotion process.
Innovation Solution
A method and apparatus that identify and differentiate between foreground and background applications, delaying page demotion for foreground applications by using a page variable that includes a foreground use variable and an opportunity variable to keep pages used by foreground applications in the page cache for a longer duration, thereby prioritizing their performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the conventional page cache manages data without differentiating between foreground and background applications, then the page cache can be simply implemented, but the performance of foreground applications deteriorates in multi-user and multi-display environments
Solution Approach 1:
The patent applies local quality by differentiating page cache management based on application type. It introduces a foreground use variable that marks pages used by foreground applications, allowing the system to apply different demotion policies to different types of pages. Pages with the foreground use variable set are protected from demotion, while other pages follow conventional demotion rules, thus improving foreground application performance without completely redesigning the page cache system.
2Ease of operation
If the page cache demotes data based on access time and frequency without considering application priority, then the page cache operates efficiently with simple rules, but the user experience deteriorates when multiple foreground applications run simultaneously
Solution Approach 1:
The patent changes the parameter used for page demotion decisions from purely access-based metrics to include application type information. It introduces a foreground use variable as an additional parameter that modifies the demotion behavior. When this variable is set for a page, the demotion policy changes to protect the page, thereby improving user experience while maintaining relatively simple operation through automated variable management.
3Quantity of substance
If the system allocates limited page cache space without prioritization, then the memory utilization is maximized, but the performance of currently used applications deteriorates
Solution Approach 1:
The patent segments the page cache management into different categories based on the foreground use variable. It divides pages into those used by foreground applications (protected from demotion) and those used by background applications (subject to normal demotion). This segmentation allows the system to prioritize page cache space allocation to foreground applications while still utilizing available memory capacity, thereby improving application access speed without completely sacrificing overall memory utilization.
Data Source
AI summary
Provided are a method and apparatus for managing a page cache for multiple foreground applications. A method of managing a page cache includes identifying an application accessing to data stored in storage; allocating a page used by the application for the accessed data to a page cache; setting a page variable corresponding to a type of the identified application to the allocated page; and managing demoting of the allocated page based on the set page when the allocated page is a demoting target.