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 18:40:13 +0100
From:   Ryan Roberts <ryan.roberts@....com>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     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>, kvm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Huang@...gle.com, Shaoqin <shaoqin.huang@...el.com>,
        Linux-MM <linux-mm@...ck.org>, Cgroups <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.

On 24/08/2022 18:25, Yosry Ahmed wrote:
> On Wed, Aug 24, 2022 at 6:42 AM Ryan Roberts <ryan.roberts@....com> wrote:
>>
>>> 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".
> 
> Sorry I missed this, thanks for catching it. The below diff fixes it
> (let me know if I need to send v8 for this, hopefully not).
> 
> diff --git a/Documentation/filesystems/proc.rst
> b/Documentation/filesystems/proc.rst
> index 898c99eae8e4..0b3778ec12e1 100644
> --- a/Documentation/filesystems/proc.rst
> +++ b/Documentation/filesystems/proc.rst
> @@ -1093,7 +1093,7 @@ 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.
> +              includes KVM mmu allocations on x86 and arm64.
>   NFS_Unstable
>                 Always zero. Previous counted pages which had been written to
>                 the server, but has not been committed to stable storage.
> 

Looks good to me!