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Re: Compressed Cache for NetBSD
On Thu, Sep 11, 2014 at 10:17:21PM -0400, vbhat%andrew.cmu.edu@localhost wrote:
> I am a Masters student at Carnegie Mellon University specializing in
> Systems (with special emphasis on Operating Systems and Storage Systems).
> I have taken a class called Operating Systems Practicum
> (https://www.cs.cmu.edu/~412/syllabus.html). The main objective of the
> course is to add a feature to any Open Source systems-y product
> (preferably an operating systems).
> I was browsing through NetBSD project wiki and came across this really
> interesting project of Compressed Cache
> (http://wiki.netbsd.org/projects/project/compressed-cache/). I would
> really appreciate if I could get some insights on this project status. I
> will mostly be working alone on this project and the timeframe I have is
> around 2 months.
> I did some basic reading and have figured out that one approach to
> implement this is to have a block device backed by kernel reserved memory.
> This block device can used as a staging area for the compressed pages. The
> interface can itself be provided through a VFS read/write semantics.
> I would really appreciate if I could get any pointers and help on this
> project. Eagerly awaiting a response.
I don't think anyone's already working on this.
Doing it with a block device (like the referenced Linux code)
shouldn't be all that difficult and even without much background
getting it done in a couple months is probably doable.
The drawback of doing it as a block device that you swap to is that
only anonymous memory pages will be sent to it; pages from files
(which includes e.g. program text) won't. But maybe that's good
enough; apparently the Linux world thought so.
(But don't try doing it inside uvm -- that is not a beginner project...)
David A. Holland
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