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This article explains the ZRAM technology in Linux, covering its principles, configuration steps, kernel integration, performance optimizations, and practical use cases for improving memory utilization on embedded devices, Android, and legacy PCs.
The article investigates why the Feishu app sometimes fails to respond to swipe gestures after a hot start, tracing the issue to the app entering a D (uninterruptible) state during memory compression, and demonstrates how adjusting CPU priority for compression threads can reduce the problem's occurrence.
Linux reduces RAM pressure through three main compression mechanisms—zSwap, which caches compressed pages before writing to swap; zRAM, a RAM‑backed compressed block device; and zCache, a file‑page compressor—each paired with specialized allocators (zsmalloc, zbud, z3fold) and configurable algorithms, offering trade‑offs in speed, ratio, CPU load, and fragmentation.