Re: [LSF/MM TOPIC] In-kernel compression in the MM subsystem

[Simon Jeons <simon.jeons@gmail.com>]

Hi Dan,
On Sat, 2013-01-26 at 12:16 -0800, Dan Magenheimer wrote:
> There's lots of interesting things going on in kernel memory
> management, but one only(?) increases the effective amount
> of data that can be stored in a fixed amount of RAM: in-kernel
> compression.
> 
> Since ramzswap/compcache (now zram) was first proposed in 2009
> as an in-memory compressed swap device, there have been a number
> of in-kernel compression solutions proposed, including
> zcache, kztmem, and now zswap.  Each shows promise to improve

What's the difference between in-memory compression and in-kernel
compression?

> performance by using compression under memory pressure to
> reduce I/O due to swapping and/or paging.  Each is still
> in staging (though zram may be promoted by LSFMM 2013)
> because each also brings a number of perplexing challenges.
> 
> I think it's time to start converging on which one or more
> of these solutions, if any, should be properly promoted and
> more fully integrated into the kernel memory management
> subsystem.  Before this can occur, it's important to build a
> broader understanding and, hopefully, also a broader consensus
> among the MM community on a number of key challenges and questions
> in order to guide and drive further development and merging.
> 
> I would like to collect a list of issues/questions, and
> start a discussion at LSF/MM by presenting this list, select
> the most important, then lead a discussion on how ever many
> there is time for.  Most likely this is an MM-only discussion
> though a subset might be suitable for a cross-talk presentataion.
> 
> Thanks!
> Dan Magenheimer
> LSF/MM attendee 2010,2011,2012
> LSF/MM presenter (MM track) 2011,2012
> 
> 
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