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

[Dan Magenheimer <dan.magenheimer@oracle.com>]

> From: Simon Jeons [mailto:simon.jeons@gmail.com]
> Subject: Re: [LSF/MM TOPIC] In-kernel compression in the MM subsystem
> 
> 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
> > 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.
> >
> 
> Is there benchmark to test each component in tmem?

Hi Simon --

I'm not sure what you mean.  Could you add a few words
to clarify?

Thanks,
Dan

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