OK, here's what I was able to get.
ck - desktop-tuned stable kernel
A stable 2.4 based patchset with a focus on performance tweaks
to the scheduler and vm, with specific tuning for the desktop
to improve system responsiveness.
(quoted from Con Kolivas <kernel@kolivas.org>)
osdl - Open Source Development Lab's exciting feature patch
For data center or carrier grade linux, tuning especially for
large machines and high database performance.
(based on comments from Stephen Hemminger <shemminger@osdl.org>)
cgl - ?
rmap - reverse mapping-based VM patch
Rmap has a reverse mapping from page frames to virtual mappings
mostly in order to make a more predictable VM, to get rid of
some worst case VM behaviours and smooth things out.
The reverse mappings provide infrastructure to make a more
flexible VM possible ... which means that VM strategies in
-rmap often change.
(based on comments of Rik van Riel)
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