CONFIG_NUMA_EMU: NUMA emulation

General informations

The Linux kernel configuration item CONFIG_NUMA_EMU has multiple definitions:

NUMA emulation found in mm/Kconfig

The configuration item CONFIG_NUMA_EMU:

• prompt: NUMA emulation
• type: bool
• depends on: CONFIG_NUMA_MEMBLKS
• defined in mm/Kconfig
• found in Linux kernels: 6.12, 6.13-rc+HEAD

Help text

Enable NUMA emulation. A flat machine will be split into virtual nodes when booted with "numa=fake=N", where N is the number of nodes. This is only useful for debugging.

NUMA emulation found in arch/x86/Kconfig

The configuration item CONFIG_NUMA_EMU:

• prompt: NUMA emulation
• type: bool
• depends on: CONFIG_NUMA
• defined in arch/x86/Kconfig
• found in Linux kernels: 2.6.24–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.11

Help text

Enable NUMA emulation. A flat machine will be split into virtual nodes when booted with "numa=fake=N", where N is the number of nodes. This is only useful for debugging.

NUMA emulation found in arch/s390/Kconfig

The configuration item CONFIG_NUMA_EMU:

• prompt: NUMA emulation
• type: bool
• depends on: (none)
• defined in arch/s390/Kconfig
• found in Linux kernels: 4.3–4.20, 5.0–5.6

Help text

Numa emulation mode will split the available system memory into equal chunks which then are distributed over the configured number of nodes in a round-robin manner.

The number of fake nodes is limited by the number of available memory chunks (i.e. memory size / fake size) and the number of supported nodes in the kernel.

The CPUs are assigned to the nodes in a way that partially respects the original machine topology (if supported by the machine). Fair distribution of the CPUs is not guaranteed.

NUMA emulation found in arch/x86_64/Kconfig

The configuration item CONFIG_NUMA_EMU:

• prompt: NUMA emulation
• type: bool
• depends on: CONFIG_NUMA
• defined in arch/x86_64/Kconfig
• found in Linux kernels: 2.6.15–2.6.23

Help text

Enable NUMA emulation. A flat machine will be split into virtual nodes when booted with "numa=fake=N", where N is the number of nodes. This is only useful for debugging.

NUMA emulation support found in arch/x86_64/Kconfig

The configuration item CONFIG_NUMA_EMU:

• prompt: NUMA emulation support
• type: bool
• depends on: CONFIG_SMP
• defined in arch/x86_64/Kconfig
• found in Linux kernels: 2.6.10–2.6.14

Help text

Enable NUMA emulation. A flat machine will be split into virtual nodes when booted with "numa=fake=N", where N is the number of nodes. This is only useful for debugging.

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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