Hi,
I'd like to try the memory hot unplug, refer to:
https://www.ovirt.org/documentation/vmm-guide/chap-Editing_Virtual_Machines.html:
"All blocks of the hot-plugged memory must be set to **online_movable** in the
virtual machine’s device management rules. In virtual machines running
up-to-date versions of Enterprise Linux or CoreOS, this rule is set by default."
I created a VM running CentOS7.6:
# more /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
# more /usr/lib/udev/rules.d/40-redhat.rules
...
# Memory hotadd request
SUBSYSTEM!="memory", ACTION!="add", GOTO="memory_hotplug_end"
PROGRAM="/bin/uname -p", RESULT=="s390*", GOTO="memory_hotplug_end"
ENV{.state}="online"
PROGRAM="/bin/systemd-detect-virt", RESULT=="none", ENV{.state}="online_movable"
ATTR{state}=="offline", ATTR{state}="$env{.state}"
LABEL="memory_hotplug_end"
It looks like the online_movable will be set only when systemd-detect-virt
returns none, i.e. hot plugging memory for a bare-metal machine, so how to make
the hot plugged memory "online_movable" in the virtual machines? Thank you.
Regards,
-Zhen
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