On 21/07/2021 13:07, Miroslav Lachman wrote:
On 21/07/2021 12:45, Andriy Gapon wrote:
On 21/07/2021 11:53, Miroslav Lachman wrote:
On 09/07/2021 13:16, Andriy Gapon wrote:
[..]
Thank you for your reply. I know nothing about system internals. Is
it too much work to implement it or just nobody from developers need
it thus nobody write the code? Virtualization is more and more
popular these days so I think it will be useful for many users.
In my opinion, both would be big changes.
At the moment we do not have any support for offlining / onlining CPUs
and that would involve a lot of careful changes like safely updating
CPU sets, various CPU masks, etc.
Ditto for the memory. Updating page arrays, free memory accounting
structures, possibly some memory maps, etc.
Definitely not a weekend project.
Thank you again. It really seems too complicated.
Have you tried messing around with virtio_balloon(4)?
It's the other way around though. You'd overprovision the VM, then
balloon memory away and later on give it back, if needed.
