Hi Chris,

Does zswap actually keep the data compressed when the DRAM-based swap is full, 
and it writes to the spill-over non-volatile swap device?

I'm not an expert on this at all, however my understanding was that zswap must 
decompress the data before it writes to the backing swap.  But perhaps I am 
misunderstanding the purpose of zswap_writeback_entry()[1] and/or what it does.

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/zswap.c#n828
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