zsmalloc defrag (Was: [PATCH] mm: remove compressed copy from zram in-memory)

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

> From: Minchan Kim [mailto:minchan@kernel.org]
> Sent: Monday, April 08, 2013 12:01 AM
> Subject: [PATCH] mm: remove compressed copy from zram in-memory

(patch removed)

> Fragment ratio is almost same but memory consumption and compile time
> is better. I am working to add defragment function of zsmalloc.

Hi Minchan --

I would be very interested in your design thoughts on
how you plan to add defragmentation for zsmalloc.  In
particular, I am wondering if your design will also
handle the requirements for zcache (especially for
cleancache pages) and perhaps also for ramster.

In https://lkml.org/lkml/2013/3/27/501 I suggested it
would be good to work together on a common design, but
you didn't reply.  Are you thinking that zsmalloc
improvements should focus only on zram, in which case
we may -- and possibly should -- end up with a different
allocator for frontswap-based/cleancache-based compression
in zcache (and possibly zswap)?

I'm just trying to determine if I should proceed separately
with my design (with Bob Liu, who expressed interest) or if
it would be beneficial to work together.

Thanks,
Dan

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