CONFIG_ZRAM_WRITEBACK: Write back incompressible or idle page to backing device

General informations

The Linux kernel configuration item CONFIG_ZRAM_WRITEBACK has multiple definitions:

Write back incompressible or idle page to backing device found in drivers/block/zram/Kconfig

The configuration item CONFIG_ZRAM_WRITEBACK:

• prompt: Write back incompressible or idle page to backing device
• type: bool
• depends on: CONFIG_ZRAM
• defined in drivers/block/zram/Kconfig
• found in Linux kernels: 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

This lets zram entries (incompressible or idle pages) be written back to a backing device, helping save memory. For this feature, admin should set up backing device via /sys/block/zramX/backing_dev.

With /sys/block/zramX/{idle,writeback}, application could ask idle page's writeback to the backing device to save in memory.

See Documentation/admin-guide/blockdev/zram.rst for more information.

Write back incompressible page to backing device found in drivers/block/zram/Kconfig

The configuration item CONFIG_ZRAM_WRITEBACK:

• prompt: Write back incompressible page to backing device
• type: bool
• depends on: CONFIG_ZRAM
• defined in drivers/block/zram/Kconfig
• found in Linux kernels: 4.14–4.20

Help text

With incompressible page, there is no memory saving to keep it in memory. Instead, write it out to backing device. For this feature, admin should set up backing device via /sys/block/zramX/backing_dev.

See Documentation/blockdev/zram.txt for more information.

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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