On Wed, Jun 17, 2015 at 6:33 PM, Vasiliy Tolstov <v.tolstov@selfip.ru> wrote:
2015-06-17 17:09 GMT+03:00 Andrey Korolyov <andrey@xdel.ru>:
The rest of visible memory is eaten by reserved kernel areas, for us this was a main reason to switch to a hotplug a couple of years ago. You would not be able to scale a VM by an order of magnitude with regular balloon mechanism without mentioned impact, unfortunately. Igor Mammedov posted hotplug-related patches for 2.6.32 a while ago, though RHEL6 never adopted them by some reason.
Hmm.. Thanks for info, from what version of kernel memory hotplug works?
-- Vasiliy Tolstov, e-mail: v.tolstov@selfip.ru
Currently QEMU memory hotplug should work with 3.8 and onwards. Mentioned patches are an adaptation for an older frankenkernel of 3.8` functionality.