CONFIG_CMA: Contiguous Memory Allocator

General informations

The Linux kernel configuration item CONFIG_CMA has multiple definitions:

Contiguous Memory Allocator found in mm/Kconfig

The configuration item CONFIG_CMA:

• prompt: Contiguous Memory Allocator
• type: bool
• depends on: CONFIG_MMU
• defined in mm/Kconfig
• found in Linux kernels: 3.12–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12

Help text

This enables the Contiguous Memory Allocator which allows other subsystems to allocate big physically-contiguous blocks of memory. CMA reserves a region of memory and allows only movable pages to be allocated from it. This way, the kernel can use the memory for pagecache and when a subsystem requests for contiguous area, the allocated pages are migrated away to serve the contiguous request.

If unsure, say "n".

Contiguous Memory Allocator found in drivers/base/Kconfig

The configuration item CONFIG_CMA:

• prompt: Contiguous Memory Allocator
• type: bool
• depends on: CONFIG_HAVE_DMA_CONTIGUOUS && CONFIG_HAVE_MEMBLOCK
• defined in drivers/base/Kconfig
• found in Linux kernels: 3.8–3.11

Help text

This enables the Contiguous Memory Allocator which allows drivers to allocate big physically-contiguous blocks of memory for use with hardware components that do not support I/O map nor scatter-gather.

For more information see <include/linux/dma-contiguous.h>. If unsure, say "n".

Contiguous Memory Allocator (EXPERIMENTAL) found in drivers/base/Kconfig

The configuration item CONFIG_CMA:

• prompt: Contiguous Memory Allocator (EXPERIMENTAL)
• type: bool
• depends on: CONFIG_HAVE_DMA_CONTIGUOUS && CONFIG_HAVE_MEMBLOCK && CONFIG_EXPERIMENTAL
• defined in drivers/base/Kconfig
• found in Linux kernels: 3.5–3.7

Help text

This enables the Contiguous Memory Allocator which allows drivers to allocate big physically-contiguous blocks of memory for use with hardware components that do not support I/O map nor scatter-gather.

For more information see <include/linux/dma-contiguous.h>. If unsure, say "n".

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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