CONFIG_PAGE_BLOCK_ORDER: Page Block Order

General informations

The Linux kernel configuration item CONFIG_PAGE_BLOCK_ORDER:

• prompt: Page Block Order
• type: int
• depends on: ( CONFIG_ARCH_FORCE_MAX_ORDER = CONFIG_0 ) && ( CONFIG_ARCH_FORCE_MAX_ORDER != CONFIG_0 )
• defined in mm/Kconfig
• found in Linux kernels: 6.16-rc+HEAD

Help text

The page block order refers to the power of two number of pages that are physically contiguous and can have a migrate type associated to them. The maximum size of the page block order is limited by ARCH_FORCE_MAX_ORDER.

This config allows overriding the default page block order when the page block order is required to be smaller than ARCH_FORCE_MAX_ORDER or MAX_PAGE_ORDER.

Reducing pageblock order can negatively impact THP generation success rate. If your workloads uses THP heavily, please use this option with caution.

Don't change if unsure.

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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