linux-kernel - Re: [v4 PATCH 7/7] doc: proc: fix the description to THPeligible

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Message-ID: <Yqp3QbJKqo/+xdKS@google.com>
Date:   Wed, 15 Jun 2022 17:20:17 -0700
From:   Zach O'Keefe <zokeefe@...gle.com>
To:     Yang Shi <shy828301@...il.com>
Cc:     vbabka@...e.cz, kirill.shutemov@...ux.intel.com,
        willy@...radead.org, linmiaohe@...wei.com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v4 PATCH 7/7] doc: proc: fix the description to THPeligible

On 15 Jun 10:29, Yang Shi wrote:
> The THPeligible bit shows 1 if and only if the VMA is eligible for
> allocating THP and the THP is also PMD mappable.  Some misaligned file
> VMAs may be eligible for allocating THP but the THP can't be mapped by
> PMD.  Make this more explictly to avoid ambiguity.
> 
> Signed-off-by: Yang Shi <shy828301@...il.com>
> ---
>  Documentation/filesystems/proc.rst | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
> index 1bc91fb8c321..a5e41e636a1a 100644
> --- a/Documentation/filesystems/proc.rst
> +++ b/Documentation/filesystems/proc.rst
> @@ -514,8 +514,10 @@ replaced by copy-on-write) part of the underlying shmem object out on swap.
>  "SwapPss" shows proportional swap share of this mapping. Unlike "Swap", this
>  does not take into account swapped out page of underlying shmem objects.
>  "Locked" indicates whether the mapping is locked in memory or not.
> +
>  "THPeligible" indicates whether the mapping is eligible for allocating THP
> -pages - 1 if true, 0 otherwise. It just shows the current status.
> +pages as well as the THP is PMD mappable or not - 1 if true, 0 otherwise.
> +It just shows the current status.
>  
>  "VmFlags" field deserves a separate description. This member represents the
>  kernel flags associated with the particular virtual memory area in two letter
> -- 
> 2.26.3
> 

Thanks for updating this!

Reviewed-by: Zach O'Keefe <zokeefe@...gle.com>