From: Luiz Capitulino <luizcap@redhat.com>
To: "David Hildenbrand (Arm)" <david@kernel.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
baolin.wang@linux.alibaba.com
Cc: ryan.roberts@arm.com, akpm@linux-foundation.org,
lorenzo.stoakes@oracle.com
Subject: Re: [PATCH v2 00/11] mm: thp: always enable mTHP support
Date: Thu, 2 Apr 2026 07:56:37 -0400 [thread overview]
Message-ID: <8d03a508-5836-4001-8eb8-b216251dc29d@redhat.com> (raw)
In-Reply-To: <835725cc-1670-45ae-bf58-593aadec6b88@kernel.org>
On 2026-04-02 04:25, David Hildenbrand (Arm) wrote:
> On 2/9/26 23:14, Luiz Capitulino wrote:
>> Today, if an architecture implements has_transparent_hugepage() and the CPU
>> lacks support for PMD-sized pages, the THP code disables all THP, including
>> mTHP. In addition, the kernel lacks a well defined API to check for
>> PMD-sized page support. It currently relies on has_transparent_hugepage()
>> and thp_disabled_by_hw(), but they are not well defined and are tied to
>> THP support.
>>
>> This series addresses both issues by introducing a new well defined API
>> to query PMD-sized page support: pgtable_has_pmd_leaves(). Using this
>> new helper, we ensure that mTHP remains enabled even when the
>> architecture or CPU doesn't support PMD-sized pages.
>>
>> Thanks to David Hildenbrand for suggesting this improvement and for
>> providing guidance (all bugs and misconceptions are mine).
>>
>> This applies to v6.19, but I tested it on v6.19-rc8+.
>
> Apologies for the delay Luiz (as told you off-list :) ), I'll try going
> through this soon so we can start queuing this after -rc1.
Oh, wow, thanks for the support!
I intended to get back to this series this week to address Baolin's
comments, but I got busy with other things (which is something I may
bring up on upstream but it's not related to this series at all).
next prev parent reply other threads:[~2026-04-02 11:56 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-09 22:14 Luiz Capitulino
2026-02-09 22:14 ` [PATCH v2 01/11] docs: tmpfs: remove implementation detail reference Luiz Capitulino
2026-02-09 22:14 ` [PATCH v2 02/11] mm: introduce pgtable_has_pmd_leaves() Luiz Capitulino
2026-02-10 7:45 ` kernel test robot
2026-02-10 8:05 ` kernel test robot
2026-02-09 22:14 ` [PATCH v2 03/11] drivers: dax: use pgtable_has_pmd_leaves() Luiz Capitulino
2026-02-09 22:14 ` [PATCH v2 04/11] drivers: i915 selftest: " Luiz Capitulino
2026-02-09 22:14 ` [PATCH v2 05/11] drivers: nvdimm: " Luiz Capitulino
2026-02-09 22:14 ` [PATCH v2 06/11] mm: debug_vm_pgtable: " Luiz Capitulino
2026-02-09 22:14 ` [PATCH v2 07/11] mm: shmem: drop has_transparent_hugepage() usage Luiz Capitulino
2026-02-10 9:20 ` Baolin Wang
2026-04-08 20:32 ` Luiz Capitulino
2026-02-09 22:14 ` [PATCH v2 08/11] treewide: rename has_transparent_hugepage() to arch_has_pmd_leaves() Luiz Capitulino
2026-02-09 22:14 ` [PATCH v2 09/11] mm: replace thp_disabled_by_hw() with pgtable_has_pmd_leaves() Luiz Capitulino
2026-02-09 22:14 ` [PATCH v2 10/11] mm: thp: always enable mTHP support Luiz Capitulino
2026-02-10 9:56 ` Baolin Wang
2026-02-10 13:28 ` Luiz Capitulino
2026-02-11 1:12 ` Baolin Wang
2026-04-08 20:37 ` Luiz Capitulino
2026-02-09 22:14 ` [PATCH v2 11/11] mm: thp: x86: cleanup PSE feature bit usage Luiz Capitulino
2026-04-02 8:25 ` [PATCH v2 00/11] mm: thp: always enable mTHP support David Hildenbrand (Arm)
2026-04-02 11:56 ` Luiz Capitulino [this message]
2026-04-08 14:14 ` David Hildenbrand (Arm)
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