Navigation: Linux Kernel Driver DataBase - web LKDDB: Main index - X index

CONFIG_XEN_BALLOON_MEMORY_HOTPLUG: Memory hotplug support for Xen balloon driver

General informations

The Linux kernel configuration item CONFIG_XEN_BALLOON_MEMORY_HOTPLUG:

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) target domain: ensure that memory auto online policy is in effect by checking /sys/devices/system/memory/auto_online_blocks file (should be 'online').

2) control domain: xl mem-max <target-domain> <maxmem> where <maxmem> is >= requested memory size,

3) control domain: xl mem-set <target-domain> <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 the target domain.

Alternatively, if memory auto onlining was not requested at step 1 the newly added memory can be manually onlined in the target domain by doing the following:

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

or by adding the following line to udev rules:

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

Hardware

LKDDb

Raw data from LKDDb:

Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

Automatic links from Google (and ads)

Custom Search

Popular queries:

Navigation: Linux Kernel Driver DataBase - web LKDDB: main index - X index

Automatically generated (in year 2016) with gen-web-lkddb.py in lkddb-sources.