zram is a compressed RAM block device with a hard capacity limit. When you put swap on it and it fills up, there is no automatic eviction, and the kernel has very little leverage to do anything about the situation. The system either OOMs or falls back to lower-priority swap, causing LRU inversion (see below). It only really makes sense for extremely memory-constrained embedded systems, diskless setups, or cases with specific security requirements around keeping private data off persistent storage. Swap on zram is also increasingly unsupported upstream.
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