Most embedded systems require contiguous memory space to be reserved for devices, which may lead to memory underutilization. Although several approaches have been proposed to address this issue, they have limitations of either inefficient memory usage or long latency for switching the reserved memory space between a device and general-purpose uses. Our scheme, on the other hand, utilizes reserved memory as an eviction-based file cache. It guarantees contiguous memory allocation to devices while providing idle device memory as an additional file cache called eCache for general-purpose usage. Because eCache stores only evicted data from the in-kernel page cache, the memory efficiency is preserved and the allocation time for devices is minimized. Cost-based region selection also minimizes additional read I/O operations by carefully discarding cached data from eCache. The additional indexing cost incurred by adding eCache is minimized by integrating its index structure with the kernel page cache. The prototype is implemented on the Nexus S smartphone and is evaluated using popular Android applications. The evaluation results show that our scheme outperforms previous approaches in terms of the application launch performance. The device memory reallocation time is also limited to a few milliseconds, which is sufficiently small to make our scheme transparent.
|Number of pages||14|
|Journal||IEEE Transactions on Mobile Computing|
|Publication status||Published - 2016 Nov|
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. NRF-2014R1A2A1A10049626) and the Ministry of Education (NRF-2014R1A1A2054658).
© 2015 IEEE.
All Science Journal Classification (ASJC) codes
- Computer Networks and Communications
- Electrical and Electronic Engineering