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Add documentation for the Xen hypervisor sysctl controls in /proc/sys/xen/balloon/. Documents the hotplug_unpopulated tunable (available when CONFIG_XEN_BALLOON_MEMORY_HOTPLUG is enabled) which controls whether unpopulated memory regions are automatically hotplugged when the Xen balloon driver needs to reclaim memory. The documentation is based on source code analysis of drivers/xen/balloon.c. Signed-off-by: Shubham Chakraborty <chakrabortyshubham66@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <20260304150419.16738-1-chakrabortyshubham66@gmail.com>
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988 B
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32 lines
988 B
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===============
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/proc/sys/xen/
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===============
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Copyright (c) 2026, Shubham Chakraborty <chakrabortyshubham66@gmail.com>
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For general info and legal blurb, please look in
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Documentation/admin-guide/sysctl/index.rst.
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------------------------------------------------------------------------------
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These files show up in ``/proc/sys/xen/``, depending on the
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kernel configuration:
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.. contents:: :local:
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balloon/hotplug_unpopulated
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===========================
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This flag controls whether unpopulated memory ranges are automatically
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hotplugged as system RAM.
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- ``0``: Unpopulated ranges are not hotplugged (default).
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- ``1``: Unpopulated ranges are automatically hotplugged.
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When enabled, the Xen balloon driver will add memory regions that are
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marked as unpopulated in the Xen memory map to the system as usable RAM.
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This allows for dynamic memory expansion in Xen guest domains.
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This option is only available when the kernel is built with
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``CONFIG_XEN_BALLOON_MEMORY_HOTPLUG`` enabled.
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