CONFIG_ZSWAP: Compressed cache for swap pages

General informations

The Linux kernel configuration item CONFIG_ZSWAP has multiple definitions:

Compressed cache for swap pages found in mm/Kconfig

The configuration item CONFIG_ZSWAP:

• prompt: Compressed cache for swap pages
• type: bool
• depends on: CONFIG_SWAP
• defined in mm/Kconfig
• found in Linux kernels: 6.1–6.12

Help text

A lightweight compressed cache for swap pages. It takes pages that are in the process of being swapped out and attempts to compress them into a dynamically allocated RAM-based memory pool. This can result in a significant I/O reduction on swap device and, in the case where decompressing from RAM is faster than swap device reads, can also improve workload performance.

Compressed cache for swap pages (EXPERIMENTAL) found in mm/Kconfig

The configuration item CONFIG_ZSWAP:

• prompt: Compressed cache for swap pages (EXPERIMENTAL)
• type: bool
• depends on: CONFIG_SWAP
• defined in mm/Kconfig
• found in Linux kernels: 3.11–3.19, 4.0–4.20, 5.0–5.19, 6.0, 6.0+HEAD

Help text

A lightweight compressed cache for swap pages. It takes pages that are in the process of being swapped out and attempts to compress them into a dynamically allocated RAM-based memory pool. This can result in a significant I/O reduction on swap device and, in the case where decompressing from RAM is faster than swap device reads, can also improve workload performance.

This is marked experimental because it is a new feature (as of v3.11) that interacts heavily with memory reclaim. While these interactions don't cause any known issues on simple memory setups, they have not be fully explored on the large set of potential configurations and workloads that exist.

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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