linux-kernel - Re: [PATCH v7 1/4] mm: add NR_SECONDARY_PAGETABLE to count secondary page table uses.

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Date:   Wed, 24 Aug 2022 14:41:49 +0100
From:   Ryan Roberts <ryan.roberts@....com>
To:     Yosry Ahmed <yosryahmed@...gle.com>, Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Oliver Upton <oupton@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Huang@...gle.com, Shaoqin <shaoqin.huang@...el.com>,
        linux-mm@...ck.org, cgroups@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        nd@....com
Subject: Re: [PATCH v7 1/4] mm: add NR_SECONDARY_PAGETABLE to count secondary
 page table uses.

> diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
> index e7aafc82be99..898c99eae8e4 100644
> --- a/Documentation/filesystems/proc.rst
> +++ b/Documentation/filesystems/proc.rst
> @@ -982,6 +982,7 @@ Example output. You may not have all of these fields.
>       SUnreclaim:       142336 kB
>       KernelStack:       11168 kB
>       PageTables:        20540 kB
> +    SecPageTables:         0 kB
>       NFS_Unstable:          0 kB
>       Bounce:                0 kB
>       WritebackTmp:          0 kB
> @@ -1090,6 +1091,9 @@ KernelStack
>                 Memory consumed by the kernel stacks of all tasks
>   PageTables
>                 Memory consumed by userspace page tables
> +SecPageTables
> +              Memory consumed by secondary page tables, this currently
> +              currently includes KVM mmu allocations on x86 and arm64.

nit: I think you have a typo here: "currently currently".

Thanks,
Ryan