linux-kernel - Re: [PATCH] mm, kvm: account kvm_vcpu

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Message-ID: <20201106205245.GB2285866@carbon.dhcp.thefacebook.com>
Date:   Fri, 6 Nov 2020 12:52:45 -0800
From:   Roman Gushchin <guro@...com>
To:     Shakeel Butt <shakeelb@...gle.com>
CC:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paolo Bonzini <pbonzini@...hat.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>
Subject: Re: [PATCH] mm, kvm: account kvm_vcpu_mmap to kmemcg

On Fri, Nov 06, 2020 at 12:29:23PM -0800, Shakeel Butt wrote:
> A VCPU of a VM can allocate couple of pages which can be mmap'ed by the
> user space application. At the moment this memory is not charged to the
> memcg of the VMM. On a large machine running large number of VMs or
> small number of VMs having large number of VCPUs, this unaccounted
> memory can be very significant. So, charge this memory to the memcg of
> the VMM. Please note that lifetime of these allocations corresponds to
> the lifetime of the VMM.
> 
> Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
> ---

Acked-by: Roman Gushchin <guro@...com>

Thanks, Shakeel!