diff options
Diffstat (limited to 'drivers/xen/Kconfig')
| -rw-r--r-- | drivers/xen/Kconfig | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig index 03bc471c3ee..5f7ff8e2fc1 100644 --- a/drivers/xen/Kconfig +++ b/drivers/xen/Kconfig @@ -11,7 +11,7 @@ config XEN_BALLOON config XEN_SELFBALLOONING bool "Dynamically self-balloon kernel memory to target" - depends on XEN && XEN_BALLOON && CLEANCACHE && SWAP + depends on XEN && XEN_BALLOON && CLEANCACHE && SWAP && XEN_TMEM default n help Self-ballooning dynamically balloons available kernel memory driven @@ -26,6 +26,36 @@ config XEN_SELFBALLOONING kernel boot parameter. Note that systems without a sufficiently large swap device should not enable self-ballooning. +config XEN_BALLOON_MEMORY_HOTPLUG + bool "Memory hotplug support for Xen balloon driver" + default n + depends on XEN_BALLOON && MEMORY_HOTPLUG + help + 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. + config XEN_SCRUB_PAGES bool "Scrub pages before returning them to system" depends on XEN_BALLOON |