CONFIG_HIGHMEM4G: High Memory Support

General informations

The Linux kernel configuration item CONFIG_HIGHMEM4G has multiple definitions:

High Memory Support found in arch/x86/Kconfig

The configuration item CONFIG_HIGHMEM4G:

• prompt: High Memory Support
• type: bool
• depends on: CONFIG_X86_32
• defined in arch/x86/Kconfig
• found in Linux kernels: 6.15-rc+HEAD

Help text

Linux can use up to 4 Gigabytes of physical memory on x86 systems. However, the address space of 32-bit x86 processors is only 4 Gigabytes large. That means that, if you have a large amount of physical memory, not all of it can be "permanently mapped" by the kernel. The physical memory that's not permanently mapped is called "high memory".

If you are compiling a kernel which will never run on a machine with more than 1 Gigabyte total physical RAM, answer "off" here (default choice and suitable for most users). This will result in a "3GB/1GB" split: 3GB are mapped so that each process sees a 3GB virtual memory space and the remaining part of the 4GB virtual memory space is used by the kernel to permanently map as much physical memory as possible.

If the machine has between 1 and 4 Gigabytes physical RAM, then answer "Y" here.

If unsure, say N.

4GB found in arch/x86/Kconfig

The configuration item CONFIG_HIGHMEM4G:

• prompt: 4GB
• type: bool
• depends on: (none)
• 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, 6.0–6.14

Help text

Select this if you have a 32-bit processor and between 1 and 4 gigabytes of physical RAM.

4GB found in arch/i386/Kconfig

The configuration item CONFIG_HIGHMEM4G:

• prompt: 4GB
• type: bool
• depends on: ! CONFIG_X86_NUMAQ
• defined in arch/i386/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.23

Help text

Select this if you have a 32-bit processor and between 1 and 4 gigabytes of physical RAM.

Hardware

LKDDb

Raw data from LKDDb:

• (none)

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)

Automatic links from Google (and ads)

Custom Search

Popular queries: