While using ZRAM on a small RAM footprint devices, together with KSM, I ran 
into several occasions when moving pages from compressed swap back into the 
"normal" part of RAM caused significant latencies in system operation. By using 
zbud I lose in compression ratio but gain in determinism, lower latencies and 
lower fragmentation, so in the coming patches I tried to generalize what I've 
done to enable zbud for zram so far.

-- 
Vitaly Wool <vitalyw...@gmail.com>
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