linux-kernel - Re: [PATCH 1/2] KVM: arm64: vgic: Add memcg accounting to vgic allocations

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Date:   Thu, 02 Sep 2021 19:03:32 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Jia He <justin.he@....com>
Cc:     James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Liu Shixin <liushixin2@...wei.com>,
        Eric Auger <eric.auger@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Shenming Lu <lushenming@...wei.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Xiaoming Ni <nixiaoming@...wei.com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] KVM: arm64: vgic: Add memcg accounting to vgic allocations

Jia,

Once again: please add a cover letter when you have a patch
series. It isn't rocket science, and Git will do it for you.

On Thu, 02 Sep 2021 01:28:00 +0100,
Jia He <justin.he@....com> wrote:
> 
> Inspired by commit 254272ce6505 ("kvm: x86: Add memcg accounting to KVM
> allocations"), it would be better to make arm64 vgic consistent with
> common kvm codes.
> 
> The memory allocations of VM scope should be charged into VM process
> cgroup, hence change GFP_KERNEL to GFP_KERNEL_ACCOUNT.
> 
> There remained a case in vgic_set_kvm_info() since this allocation is
> global, not in VM scope.
> 
> Signed-off-by: Jia He <justin.he@....com>
> ---
>  arch/arm64/kvm/vgic/vgic-debug.c   |  2 +-
>  arch/arm64/kvm/vgic/vgic-init.c    |  2 +-
>  arch/arm64/kvm/vgic/vgic-irqfd.c   |  2 +-
>  arch/arm64/kvm/vgic/vgic-its.c     | 14 +++++++-------
>  arch/arm64/kvm/vgic/vgic-mmio-v3.c |  2 +-
>  arch/arm64/kvm/vgic/vgic-v4.c      |  2 +-
>  6 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm64/kvm/vgic/vgic-debug.c b/arch/arm64/kvm/vgic/vgic-debug.c
> index f38c40a76251..e6a01f210df9 100644
> --- a/arch/arm64/kvm/vgic/vgic-debug.c
> +++ b/arch/arm64/kvm/vgic/vgic-debug.c
> @@ -92,7 +92,7 @@ static void *vgic_debug_start(struct seq_file *s, loff_t *pos)
>  		goto out;
>  	}
>  
> -	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
> +	iter = kmalloc(sizeof(*iter), GFP_KERNEL_ACCOUNT);

This really isn't an allocation made in the context of a VM. I don't
think this hunk belongs here.

Thanks,

	M.

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