[Kimchi-devel] [RFC][Kimchi] Guest Max memory setup and update

[Samuel Guimarães]

Hi team,

I have some questions. I've wrote them below the requirements for the
front-end.

Samuel

2016-01-08 16:18 GMT-02:00 Rodrigo Trujillo <
rodrigo.trujillo at linux.vnet.ibm.com>:

> Hi all,
>
> The guest xml tag <max_memory> is necessary to allow memory hotplug.
> Currently, max_memory is the lesser value among "guest memory X4",  "Host
> Memory" or "1TB". It is also not possible to user, to set it.
>
> Proposal: Modify backend and frontend in order to allow users to
> increase/decrease max_memory value. In other words, user will be allowed to
> set the amount of memory that will be possible to hotplug.
>
> BACKEND   (a previous patch was already sent to mailing list, must sent
> new version)
> - Remove current settings when guest is created. Set max_memory equal
> guest memory.;
> - Does not allow change max_memory when guest is running;
> - When hotplug, continue with slots of 1GB, but restrict 32 slots in
> PowerPC;
> - Update/Add tests;
> - Change JSON memory field to:   memory: { current: XXX, maxmemory: YYYY };
>
>
> FRONTEND
>
> - In guest edit window,  modify memory input field. Change it to a
> increase/decrease ( +/- ) input box;
>

IE9, 10, 11 and Edge doesn't fully support input "number" yet. They display
as a regular text field with a "x" to clear the field and accept only
numbers but they don't show the double arrows (that we can't change to +
and - even in Chrome). If we all agree I'm ok to change the input type from
text to number regardless of these known issues.


> - Create a hidden area which will hold max memory input box
> (increase/decrease);
>
- Increments will be of 1GB;
>

Is this increment rule only for the Max Memory input or also for the
current memory? What happens If the user start editing a VM that was
created outside Kimchi and has set the maximum memory to something like
768MB? Should the input fill the memory to 1024MB and then on the next
click in the arrow go to 2048MB or add 1024MB on top of the current memory?


> - Create a "More Options" link besides Memory , that is going to
> show/hide  max memory area;
> - If guest is online:
>     * max memory field will be disabled;
>     * memory will be enabled, allowing hotplug;
> - When guest is offline, it is ok to change max memory, enable it;
>
>
> API CHANGES:
>
> JSON must be changed in requests and responses:
>     - When updating guest (PUT), memory field will become:
>             memory: { current: <memory new value>, maxmemory: <maxmemory
> new value> }
>     - response (GET):
>             memory: { current: <memory new value>, maxmemory: <maxmemory
> new value> }
>
> It is not necessary to include maxmemory if was not changed.
>
> Thoughts ?
>
> Rodrigo Trujillo
>
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>
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