linux-kernel - Re: [PATCH v3 2/4] mm: shmem: control THP support through the kernel command line

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Message-ID: <73d19983-b97c-49fc-be9e-89728626dbed@redhat.com>
Date: Thu, 31 Oct 2024 13:32:08 +0100
From: David Hildenbrand <david@...hat.com>
To: Maíra Canal <mcanal@...lia.com>,
 Jonathan Corbet <corbet@....net>, Andrew Morton <akpm@...ux-foundation.org>,
 Hugh Dickins <hughd@...gle.com>, Barry Song <baohua@...nel.org>,
 Ryan Roberts <ryan.roberts@....com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, Lance Yang <ioworker0@...il.com>
Cc: linux-mm@...ck.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel-dev@...lia.com
Subject: Re: [PATCH v3 2/4] mm: shmem: control THP support through the kernel
 command line

On 30.10.24 13:58, Maíra Canal wrote:
> Add a new kernel command line to control the hugepage allocation policy
> for the internal shmem mount, ``transparent_hugepage_shmem``. The
> parameter is similar to ``transparent_hugepage`` and has the following
> format:
> 
> transparent_hugepage_shmem=<policy>
> 
> where ``<policy>`` is one of the seven valid policies available for
> shmem.
> 
> By configuring the default hugepage allocation policy for the internal
> shmem mount, applications that use shmem, such as the DRM GEM objects,
> can take advantage of mTHP before it's been configured through sysfs.
> 
> Signed-off-by: Maíra Canal <mcanal@...lia.com>
> ---
>   .../admin-guide/kernel-parameters.txt         |  7 ++
>   Documentation/admin-guide/mm/transhuge.rst    |  6 ++
>   mm/shmem.c                                    | 72 +++++++++++++------
>   3 files changed, 62 insertions(+), 23 deletions(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 1666576acc0e..acabb04d0dd4 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -6926,6 +6926,13 @@
>   			See Documentation/admin-guide/mm/transhuge.rst
>   			for more details.
>   
> +	transparent_hugepage_shmem= [KNL]
> +			Format: [always|within_size|advise|never|deny|force]
> +			Can be used to control the hugepage allocation policy for
> +			the internal shmem mount.
> +			See Documentation/admin-guide/mm/transhuge.rst
> +			for more details.
> +

LGTM, and it's consistent with the parameter for anon.

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb