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SubjectRe: [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@google.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
>

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