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    SubjectRe: [PATCH V3] xen/balloon: Memory hotplug support for Xen balloon driver
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    On Wed, 2011-05-18 at 07:57 +0100, Vasiliy G Tolstov wrote:
    > On Tue, 2011-05-17 at 23:44 +0200, Daniel Kiper wrote:
    > > + 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
    > > +

    > Very good. Is that possible to eliminate step 3 ? And do it automatic if
    > domU runs with specific xen balloon param?

    When we faced the same question WRT VCPU hotplug we ended up using a
    udev rule. Presumably the same could be done here. In the VCPU case the
    rule is:

    ACTION=="add", SUBSYSTEM=="cpu", RUN+="/bin/sh -c '[ ! -e /sys$devpath/online ] || echo 1 > /sys$devpath/online'"

    Presumably the memory one will be broadly similar.

    Ian.



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