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CONFIG_XEN_BALLOON_MEMORY_HOTPLUG: Memory hotplug support for Xen balloon driver

General informations

The Linux kernel configuration item CONFIG_XEN_BALLOON_MEMORY_HOTPLUG:

• prompt: Memory hotplug support for Xen balloon driver
• type: bool
• depends on: CONFIG_XEN_BALLOON && CONFIG_MEMORY_HOTPLUG
• defined in drivers/xen/Kconfig
• found in Linux kernels: 3.1–3.9, 3.10-rc+HEAD

Help text

Memory hotplug support for Xen balloon driver allows expanding memory available for the system above limit declared at system startup. It is very useful on critical systems which require long run without rebooting.

Memory could be hotplugged in following steps:

1) dom0: xl mem-max <domU> <maxmem> where <maxmem> is >= requested memory size,

2) dom0: xl mem-set <domU> <memory> where <memory> is requested memory size; alternatively memory could be added by writing proper value to /sys/devices/system/xen_memory/xen_memory0/target or /sys/devices/system/xen_memory/xen_memory0/target_kb on dumU,

3) domU: for i in /sys/devices/system/memory/memory*/state; do \ [ "`cat "$i"`" = offline ] && echo online > "$i"; done

Memory could be onlined automatically on domU by adding following line to udev rules:

SUBSYSTEM=="memory", ACTION=="add", RUN+="/bin/sh -c '[ -f /sys$devpath/state ] && echo online > /sys$devpath/state'"

In that case step 3 should be omitted.

Hardware

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