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CONFIG_HIGHPTE: Allocate 3rd-level pagetables from highmem

General informations

The Linux kernel configuration item CONFIG_HIGHPTE has multiple definitions:

Allocate 2nd-level pagetables from highmem found in arch/arm/Kconfig

The configuration item CONFIG_HIGHPTE:

Help text

The VM uses one page of physical memory for each page table. For systems with a lot of processes, this can use a lot of precious low memory, eventually leading to low memory being consumed by page tables. Setting this option will allow user-space 2nd level page tables to reside in high memory.

Allocate 3rd-level pagetables from highmem found in arch/i386/Kconfig

The configuration item CONFIG_HIGHPTE:

Help text

The VM uses one page table entry for each page of physical memory. For systems with a lot of RAM, this can be wasteful of precious low memory. Setting this option will put user-space page table entries in high memory.

Allocate 3rd-level pagetables from highmem found in arch/x86/Kconfig

The configuration item CONFIG_HIGHPTE:

Help text

The VM uses one page table entry for each page of physical memory. For systems with a lot of RAM, this can be wasteful of precious low memory. Setting this option will put user-space page table entries in high memory.

Allocate page tables in highmem found in arch/frv/Kconfig

The configuration item CONFIG_HIGHPTE:

Help text

The VM uses one page of memory for each page table. For systems with a lot of RAM, this can be wasteful of precious low memory. Setting this option will put user-space page tables in high memory.

Hardware

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