linux-kernel - Re: [PATCH] KVM: arm: memcg awareness

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Date:   Wed, 17 Mar 2021 09:15:30 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     Michal Hocko <mhocko@...e.com>,
        LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH] KVM: arm: memcg awareness

On Wed, 17 Mar 2021 08:04:20 +0000,
Wanpeng Li <kernellwp@...il.com> wrote:
> 
> On Wed, 17 Mar 2021 at 15:57, Michal Hocko <mhocko@...e.com> wrote:
> >
> > On Wed 17-03-21 13:46:24, Wanpeng Li wrote:
> > > From: Wanpeng Li <wanpengli@...cent.com>
> > >
> > > 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. :)

You expect us to review your patches, don't you?

Surely you can afford to explain why I should consider it at all. And
if you cannot be bothered, maybe I shouldn't either.

	M.

-- 
Without deviation from the norm, progress is not possible.