Re: CPU hot-plug and RAM hot-add in virtual machines
Date: Wed, 21 Jul 2021 12:07:33 UTC
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. Miroslav Lachman