Re: [PATCH] KVM: arm: memcg awareness

[Wanpeng Li]

On Wed, 17 Mar 2021 at 15:57, Michal Hocko <mhocko@xxxxxxxx> wrote:
>
> On Wed 17-03-21 13:46:24, Wanpeng Li wrote:
> > From: Wanpeng Li <wanpengli@xxxxxxxxxxx>
> >
> > KVM allocations in the arm kvm code which are tied to the life
> > of the VM process should be charged to the VM process's cgroup.
>
> How much memory are we talking about?
>
> > This will help the memcg controler to do the right decisions.
>
> This is a bit vague. What is the right decision? AFAICS none of that
> memory is considered during oom victim selection. The only thing memcg
> controler can help with is to contain and account this additional
> memory. This might help to better isolate multiple workloads on the same
> system. Maybe this is what you wanted to say? Or maybe this is a way to
> prevent untrusted users from consuming a lot of memory?

It is explained in this patchset for x86 kvm which is upstream, I
think I don't need to copy and paste. :)

    Wanpeng