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CELF Project proposal: UBIFS mount-time speedups
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Tim Bird <tim.bird@...>
Summary: Improve UBIFS mounting time
Proposer: Tim Bird Description: UBIFS is a next-generation flash-based file system for Linux. It is a read/write file system, which supports compression and has good performance. However, it's mount times are not very good. This affects overall Linux boot time, for a UBIFS-based embedded system. The purpose of this project would be to investigate mount performance issues, and try to resolve them. One suggestion is to keep the bad block table on flash, instead of re-scanning it on every boot. It is not known if algorithms to do this are covered by existing flash management patents. Related work: * UBIFS ** http://en.wikipedia.org/wiki/UBIFS ** http://lwn.net/Articles/276025/ * UBI2 ** see portions of http://www.mjmwired.net/kernel/Documentation/filesystems/ubifs.txt * Mount times ** http://osl.sed.hu/wiki/ubifs/index.php/Mount_results ** http://elinux.org/images/f/f8/CELFJamboree30-UBIFS_update.pdf Scope: This project might take about 4 months Notes: Toshiba may already be working on this project. ============================= Tim Bird Architecture Group Chair, CE Linux Forum Senior Staff Engineer, Sony Corporation of America ============================= |
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Kyungmin Park <kmpark@...>
Summary: UBI block mapping on flash (UBI2 requirement)
Proposer: Kyungmin Park Description: UBI scans all physical block at boot time. and maintain it at RAM. Usually this scan time takes almost 2 or more seconds. To reduce the this time UBI maintain block mapping information on flash and use it at next boot time. Also it have to support or provide rescan mechanism at runtime to use single image into another flash * UBI2 ** see portions of http://www.mjmwired.net/kernel/Documentation/filesystems/ubifs.txt Scope: This project might take about 2 months. |
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Tim Bird <tim.bird@...>
Kyungmin Park wrote:
Summary: UBI block mapping on flash (UBI2 requirement)This looks like a subset of the project described at: http://elinux.org/CELF_Project_Proposal/UBIFS_mount_time_speedups I've added your description as a comment in that proposal. Thanks! -- Tim ============================= Tim Bird Architecture Group Chair, CE Linux Forum Senior Staff Engineer, Sony Corporation of America ============================= |
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