CONFIG_PERSISTENT_HUGE_ZERO_FOLIO: Allocate a PMD sized folio for zeroing

General informations

The Linux kernel configuration item CONFIG_PERSISTENT_HUGE_ZERO_FOLIO:

• prompt: Allocate a PMD sized folio for zeroing
• type: bool
• depends on: CONFIG_TRANSPARENT_HUGEPAGE
• defined in mm/Kconfig
• found in Linux kernels: 6.18-rc+HEAD

Help text

Enable this option to reduce the runtime refcounting overhead of the huge zero folio and expand the places in the kernel that can use huge zero folios. For instance, block I/O benefits from access to large folios for zeroing memory.

With this option enabled, the huge zero folio is allocated once and never freed. One full huge page's worth of memory shall be used.

Say Y if your system has lots of memory. Say N if you are memory constrained.

Hardware

LKDDb

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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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