CONFIG_ZONE_DEVICE: Device memory (pmem, HMM, etc...) hotplug support

General informations

The Linux kernel configuration item CONFIG_ZONE_DEVICE has multiple definitions:

Device memory (pmem, HMM, etc...) hotplug support found in mm/Kconfig

The configuration item CONFIG_ZONE_DEVICE:

• prompt: Device memory (pmem, HMM, etc...) hotplug support
• type: bool
• depends on: ( CONFIG_MEMORY_HOTPLUG ) && ( CONFIG_MEMORY_HOTREMOVE ) && ( CONFIG_SPARSEMEM_VMEMMAP ) && ( CONFIG_ARCH_HAS_PTE_DEVMAP )
• defined in mm/Kconfig
• found in Linux kernels: 4.14–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Device memory hotplug support allows for establishing pmem, or other device driver discovered memory regions, in the memmap. This allows pfn_to_page() lookups of otherwise "device-physical" addresses which is needed for using a DAX mapping in an O_DIRECT operation, among other things.

If FS_DAX is enabled, then say Y.

Device memory (pmem, etc...) hotplug support found in mm/Kconfig

The configuration item CONFIG_ZONE_DEVICE:

• prompt: Device memory (pmem, etc...) hotplug support
• type: bool
• depends on: ( CONFIG_MEMORY_HOTPLUG ) && ( CONFIG_MEMORY_HOTREMOVE ) && ( CONFIG_SPARSEMEM_VMEMMAP ) && ( CONFIG_ARCH_HAS_ZONE_DEVICE )
• defined in mm/Kconfig
• found in Linux kernels: 4.3–4.13

Help text

Device memory hotplug support allows for establishing pmem, or other device driver discovered memory regions, in the memmap. This allows pfn_to_page() lookups of otherwise "device-physical" addresses which is needed for using a DAX mapping in an O_DIRECT operation, among other things.

If FS_DAX is enabled, then say Y.

Hardware

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Sources

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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