linux-kernel - Re: [PATCH v6 0/4] KVM: mm: count KVM mmu usage in memory stats

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Date:   Thu, 30 Jun 2022 14:01:52 -0700
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Marc Zyngier <maz@...nel.org>
Cc:     Huang@...gle.com, Tejun Heo <tj@...nel.org>,
        Shaoqin <shaoqin.huang@...el.com>,
        Cgroups <cgroups@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        James Morse <james.morse@....com>,
        Joerg Roedel <joro@...tes.org>,
        Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Oliver Upton <oupton@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
        Zefan Li <lizefan.x@...edance.com>
Subject: Re: [PATCH v6 0/4] KVM: mm: count KVM mmu usage in memory stats

If/when this patchset gets merged, would it be through the mm tree or
kvm tree? It is based on the kvm-queue branch so I am guessing it
could be easier to go through kvm but I am not sure what the policy is
here. Andrew or Paolo, do you mind clarifying the policy on such
patchsets? Thanks!

On Tue, Jun 28, 2022 at 3:09 PM Yosry Ahmed <yosryahmed@...gle.com> wrote:
>
> Add NR_SECONDARY_PAGETABLE memory stat and use it to account KVM mmu
> usage as the first type of accounted secondary page tables. This stat
> can be later extended to account for other types of secondary pages
> tables (e.g. iommu page tables).
>
> Rationale behind why this is useful and link to extended discussion in
> the first patch.
>
> ---
>
> Changes in V6:
> - Rebased on top of kvm/queue and fixed conflicts.
> - Fixed docs spaces and tabs (Sean).
> - More narrative commit logs (Sean and Oliver).
> - Updated kvm_account_pgtable_pages() documentation to describe the
>   rules of using it more clearly (Sean).
> - Collected Acks and Reviewed-by's by Shakeel and Oliver (Thanks!)
>
> Changes in V5:
> - Updated cover letter to explain more the rationale behind the change
>   (Thanks to contributions by Sean Christopherson).
> - Removed extraneous + in arm64 patch (Oliver Upton, Marc Zyngier).
> - Shortened secondary_pagetables to sec_pagetables (Shakeel Butt).
> - Removed dependency on other patchsets (applies to queue branch).
>
> Changes in V4:
> - Changed accounting hooks in arm64 to only account s2 page tables and
>   refactored them to a much cleaner form, based on recommendations from
>   Oliver Upton and Marc Zyngier.
> - Dropped patches for mips and riscv. I am not interested in those archs
>   anyway and don't have the resources to test them. I posted them for
>   completeness but it doesn't seem like anyone was interested.
>
> Changes in V3:
> - Added NR_SECONDARY_PAGETABLE instead of piggybacking on NR_PAGETABLE
>   stats.
>
> Changes in V2:
> - Added accounting stats for other archs than x86.
> - Changed locations in the code where x86 KVM page table stats were
>   accounted based on suggestions from Sean Christopherson.
>
> ---
>
> Yosry Ahmed (4):
>   mm: add NR_SECONDARY_PAGETABLE to count secondary page table uses.
>   KVM: mmu: add a helper to account memory used by KVM MMU.
>   KVM: x86/mmu: count KVM mmu usage in secondary pagetable stats.
>   KVM: arm64/mmu: count KVM s2 mmu usage in secondary pagetable stats
>
>  Documentation/admin-guide/cgroup-v2.rst |  5 ++++
>  Documentation/filesystems/proc.rst      |  4 +++
>  arch/arm64/kvm/mmu.c                    | 36 ++++++++++++++++++++++---
>  arch/x86/kvm/mmu/mmu.c                  | 16 +++++++++--
>  arch/x86/kvm/mmu/tdp_mmu.c              | 12 +++++++++
>  drivers/base/node.c                     |  2 ++
>  fs/proc/meminfo.c                       |  2 ++
>  include/linux/kvm_host.h                | 10 +++++++
>  include/linux/mmzone.h                  |  1 +
>  mm/memcontrol.c                         |  1 +
>  mm/page_alloc.c                         |  6 ++++-
>  mm/vmstat.c                             |  1 +
>  12 files changed, 89 insertions(+), 7 deletions(-)
>
> --
> 2.37.0.rc0.161.g10f37bed90-goog
>