linux-kernel - Re: [PATCH] docs: update THP admin guide about non-tmpfs filesystem support

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Message-ID: <Z-5n8XrUIAV4r_tG@archie.me>
Date: Thu, 3 Apr 2025 17:50:25 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>
Cc: linux-kernel@...r.kernel.org, willy@...radead.org, linux-mm@...ck.org,
	David Hildenbrand <david@...hat.com>, da.gomez@...nel.org,
	mcgrof@...nel.org, gost.dev@...sung.com, linux-doc@...r.kernel.org,
	Pankaj Raghav <p.raghav@...sung.com>
Subject: Re: [PATCH] docs: update THP admin guide about non-tmpfs filesystem
 support

On Thu, Apr 03, 2025 at 12:38:05PM +0200, Pankaj Raghav (Samsung) wrote:
> diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst
> index dff8d5985f0f..01b7ce90d693 100644
> --- a/Documentation/admin-guide/mm/transhuge.rst
> +++ b/Documentation/admin-guide/mm/transhuge.rst
> @@ -12,8 +12,8 @@ using huge pages for the backing of virtual memory with huge pages
>  that supports the automatic promotion and demotion of page sizes and
>  without the shortcomings of hugetlbfs.
>  
> -Currently THP only works for anonymous memory mappings and tmpfs/shmem.
> -But in the future it can expand to other filesystems.
> +Currently, THP only works for anonymous memory mappings, tmpfs/shmem and
> +filesystems that support large folios.
>  
>  .. note::
>     in the examples below we presume that the basic page size is 4K and
> @@ -463,6 +463,10 @@ fields for each mapping. (Note that AnonHugePages only applies to traditional
>  PMD-sized THP for historical reasons and should have been called
>  AnonHugePmdMapped).
>  
> +The number of PMD-sized transparent huge pages currently used by
> +filesystem data (page cache) is available by reading the FileHugePages field
> +in ``/proc/meminfo``.
> +
>  The number of file transparent huge pages mapped to userspace is available
>  by reading ShmemPmdMapped and ShmemHugePages fields in ``/proc/meminfo``.
>  To identify what applications are mapping file transparent huge pages, it
> 
> base-commit: f0a16f5363325cc8d9382471cdc7b654c53254c9

The wording looks good, thanks!

Reviewed-by: Bagas Sanjaya <bagasdotme@...il.com>

-- 
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