preview of swap on ZRAM feature/change

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Hi,

This topic has been discussed a couple times on devel@ over the past
year -  related to resource control, and better interactivity in low
memory situations. And now I have a preview of the change proposal
ready.

https://fedoraproject.org/wiki/Changes/SwapOnZRAM

The proposal aims for default partitioning, for all Fedora editions
and spins, to not create a swap-on-disk partition. And instead create
a compression-based RAM disk, called ZRAM, and use that for swap.

Previous conversations with cloud and server folks suggests it's
somewhat common to not have swap at all. Hopefully I can change your
minds. :D Fast swap is good.

I'm confident a one-size-fits all size for the ZRAM device is
possible, as a fraction of RAM, with a max size (cap). This should be
aggressive enough for low memory devices, while also not expending as
much overhead for the systems with a lot of memory. It might be an
option to ship different configurations, if necessary.

There is a test day planned. But I'd like to get solid buy-in from
cloud and server folks before then.

Thanks,

-- 
Chris Murphy
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