snippetbashTip

chmem — Modify the state of memory blocks (online or offline) in a Linux system. Typically used in virtualiz

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the chmem command: Modify the state of memory blocks (online or offline) in a Linux system. Typically used in virtualized environments to manage memory hotplug. More information: <https://manned.org/chmem>.

Solution

chmem — Modify the state of memory blocks (online or offline) in a Linux system. Typically used in virtualized environments to manage memory hotplug. More information: <https://manned.org/chmem>.

Set a memory block offline:

sudo chmem {{[-b|--block]}} {{[-d|--disable]}} {{block_number}}

Set a memory block online:

sudo chmem {{[-b|--block]}} {{[-e|--enable]}} {{block_number}}

Set a memory range offline using hexadecimal addresses:

sudo chmem {{[-d|--disable]}} 0x{{start_address}}-0x{{end_address}}

Set a memory range online using hexadecimal addresses:

sudo chmem {{[-e|--enable]}} 0x{{start_address}}-0x{{end_address}}

Set memory online and assign it to a specific zone (e.g., Movable):

sudo chmem {{[-e|--enable]}} 0x{{start_address}} {{[-z|--zone]}} {{Movable}}

Display help:

chmem {{[-h|--help]}}

Code Snippets

Set a memory block offline

sudo chmem {{[-b|--block]}} {{[-d|--disable]}} {{block_number}}

Set a memory block online

sudo chmem {{[-b|--block]}} {{[-e|--enable]}} {{block_number}}

Set a memory range offline using hexadecimal addresses

sudo chmem {{[-d|--disable]}} 0x{{start_address}}-0x{{end_address}}

Set a memory range online using hexadecimal addresses

sudo chmem {{[-e|--enable]}} 0x{{start_address}}-0x{{end_address}}

Set memory online and assign it to a specific zone (e.g., Movable)

sudo chmem {{[-e|--enable]}} 0x{{start_address}} {{[-z|--zone]}} {{Movable}}

Context

tldr-pages: linux/chmem

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