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CONFIG_FORCE_MAX_ZONEORDER: Maximum zone order

General informations

The Linux kernel configuration item CONFIG_FORCE_MAX_ZONEORDER has multiple definitions:

found in arch/arm/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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found in arch/arm26/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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found in arch/arm64/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value.

This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages.

We make sure that we can allocate upto a HugePage size for each configuration. Hence we have : MAX_ORDER = (PMD_SHIFT - PAGE_SHIFT) + 1 => PAGE_SHIFT - 2

However for 4K, we choose a higher default value, 11 as opposed to 10, giving us 4M allocations matching the default size used by generic code.

found in arch/blackfin/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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found in arch/cris/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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found in arch/ia64/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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found in arch/powerpc/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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found in arch/ppc64/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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found in arch/s390/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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found in arch/tile/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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found in arch/v850/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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MAX_ORDER (11 - 17) found in arch/ia64/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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Maximum zone order found in arch/arc/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

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Maximum zone order found in arch/arm/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

Help text

The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value.

This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages.

Maximum zone order found in arch/c6x/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

Help text

The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value.

This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages.

Maximum zone order found in arch/metag/mm/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

Help text

The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value.

This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages.

The page size is not necessarily 4KB. Keep this in mind when choosing a value for this option.

Maximum zone order found in arch/mips/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

Help text

The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value.

This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages.

The page size is not necessarily 4KB. Keep this in mind when choosing a value for this option.

Maximum zone order found in arch/nios2/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

Help text

The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value.

This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages.

Maximum zone order found in arch/powerpc/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

Help text

The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value.

This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages.

The page size is not necessarily 4KB. For example, on 64-bit systems, 64KB pages can be enabled via PPC_64K_PAGES. Keep this in mind when choosing a value for this option.

Maximum zone order found in arch/sh/mm/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

Help text

The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value.

This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages.

The page size is not necessarily 4KB. Keep this in mind when choosing a value for this option.

Maximum zone order found in arch/sparc/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

Help text

The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value.

This config option is actually maximum order plus one. For example, a value of 13 means that the largest free memory block is 2^12 pages.

Maximum zone order found in arch/xtensa/Kconfig

The configuration item CONFIG_FORCE_MAX_ZONEORDER:

Help text

The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value.

This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages.

Hardware

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