linux-kernel - [PATCH v2 0/4] mm: add more kernel parameters to control mTHP

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Message-ID: <20241029002324.1062723-1-mcanal@igalia.com>
Date: Mon, 28 Oct 2024 21:13:04 -0300
From: Maíra Canal <mcanal@...lia.com>
To: Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Barry Song <baohua@...nel.org>,
	David Hildenbrand <david@...hat.com>,
	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,
	Maíra Canal <mcanal@...lia.com>
Subject: [PATCH v2 0/4] mm: add more kernel parameters to control mTHP

This series introduces three patches related to the kernel parameters
controlling mTHP. The first patch is a straightforward documentation update,
correcting the format of the kernel parameter ``thp_anon=``.

The second and third patches focus on controlling THP support for shmem
via the kernel command line. The second patch introduces a parameter to
control the global default huge page allocation policy for the internal
shmem mount. The third patch implements a parameter similar to ``thp_anon=``,
but for shmem.

The goal of these changes is to simplify the configuration of systems that
rely on mTHP support for shmem. For instance, a platform with a GPU that
benefits from huge pages may want to enable huge pages for shmem. Having
these kernel parameters streamlines the configuration process and ensures
consistency across setups.

v1 -> v2: https://lore.kernel.org/linux-mm/20241027175743.1056710-1-mcanal@igalia.com/T/

* [1/4] s/fix the format/fix the doc in the commit's subject (Barry Song & David Hildenbrand)
* [1/4] Add Barry's A-b to PATCH 1/3 (Barry Song)
* [1/4] s/64KB/64K (David Hildenbrand)
* [1/4] Add David's A-b to PATCH 1/3 (David Hildenbrand)
* [2/4] Create the function `shmem_valid_huge()` to reduce code-duplication (Baolin Wang)
* [3/4] New PATCH: generalize the function `setup_thp_anon()` and add it to common file
* [4/4] Fix typo in the documentation: s/shmem_anon/thp_shmem (Barry Song)
* [4/4] Reduce code-duplication (Barry Song)

Best Regards,
- Maíra

Maíra Canal (4):
  mm: fix docs for the kernel parameter ``thp_anon=``
  mm: shmem: control THP support through the kernel command line
  mm: generalize the implementation of ``thp_anon=``
  mm: shmem: override mTHP shmem default with a kernel parameter

 .../admin-guide/kernel-parameters.txt         |  19 ++-
 Documentation/admin-guide/mm/transhuge.rst    |  25 +++-
 include/linux/huge_mm.h                       |  29 +++++
 mm/huge_memory.c                              | 109 ++++++++----------
 mm/shmem.c                                    |  91 +++++++++++++--
 5 files changed, 201 insertions(+), 72 deletions(-)

-- 
2.46.2