From: Baolin Wang <baolin.wang@linux.alibaba.com>
To: Luiz Capitulino <luizcap@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
david@kernel.org, ziy@nvidia.com, lance.yang@linux.dev
Cc: corbet@lwn.net, tsbogend@alpha.franken.de, maddy@linux.ibm.com,
mpe@ellerman.id.au, agordeev@linux.ibm.com,
gerald.schaefer@linux.ibm.com, hca@linux.ibm.com,
gor@linux.ibm.com, x86@kernel.org, dave.hansen@linux.intel.com,
djbw@kernel.org, vishal.l.verma@intel.com, dave.jiang@intel.com,
akpm@linux-foundation.org, lorenzo.stoakes@oracle.com
Subject: Re: [PATCH v4 9/9] mm: thp: always enable mTHP support
Date: Wed, 6 May 2026 13:46:15 +0800 [thread overview]
Message-ID: <37990f6e-61ae-4b8d-94e5-772bb6f800fe@linux.alibaba.com> (raw)
In-Reply-To: <f67da00a825da9097b5faf2f390ad344450b88be.1777663129.git.luizcap@redhat.com>
On 5/2/26 3:18 AM, Luiz Capitulino wrote:
> If PMD-sized pages are not supported on an architecture (ie. the
> arch implements arch_has_pmd_leaves() and it returns false) then the
> current code disables all THP, including mTHP.
>
> This commit fixes this by allowing mTHP to be always enabled for all
> archs. When PMD-sized pages are not supported, its sysfs entry won't be
> created and their mapping will be disallowed at page-fault time.
>
> Similarly, this commit implements the following changes for shmem in
> shmem_allowable_huge_orders():
>
> - Drop the pgtable_has_pmd_leaves() check so that mTHP sizes are
> considered
> - Filter out PMD and PUD orders from allowable orders when
> PMD-sized pages are not supported by the CPU
>
> Signed-off-by: Luiz Capitulino <luizcap@redhat.com>
> ---
Nothing else caught my eye. Thanks. Feel free to add:
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
next prev parent reply other threads:[~2026-05-06 5:46 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-01 19:18 [PATCH v4 0/9] mm: thp: always enable mTHP support Luiz Capitulino
2026-05-01 19:18 ` [PATCH v4 1/9] docs: tmpfs: remove implementation detail reference Luiz Capitulino
2026-05-01 19:18 ` [PATCH v4 2/9] mm: introduce pgtable_has_pmd_leaves() Luiz Capitulino
2026-05-06 17:50 ` (sashiko review) " Luiz Capitulino
2026-05-13 15:30 ` David Hildenbrand (Arm)
2026-05-14 1:52 ` Luiz Capitulino
2026-05-13 15:36 ` David Hildenbrand (Arm)
2026-05-14 2:18 ` Luiz Capitulino
2026-05-01 19:18 ` [PATCH v4 3/9] drivers: dax: use pgtable_has_pmd_leaves() Luiz Capitulino
2026-05-13 15:40 ` David Hildenbrand (Arm)
2026-05-14 2:25 ` Luiz Capitulino
2026-05-01 19:18 ` [PATCH v4 4/9] drivers: nvdimm: " Luiz Capitulino
2026-05-01 19:18 ` [PATCH v4 5/9] mm: debug_vm_pgtable: " Luiz Capitulino
2026-05-01 19:18 ` [PATCH v4 6/9] mm: shmem: drop has_transparent_hugepage() usage Luiz Capitulino
2026-05-06 18:12 ` (sashiko review) " Luiz Capitulino
2026-05-01 19:18 ` [PATCH v4 7/9] treewide: introduce arch_has_pmd_leaves() Luiz Capitulino
2026-05-06 18:22 ` (sashiko review) " Luiz Capitulino
2026-05-06 18:30 ` Luiz Capitulino
2026-05-01 19:18 ` [PATCH v4 8/9] mm: replace thp_disabled_by_hw() with pgtable_has_pmd_leaves() Luiz Capitulino
2026-05-13 15:50 ` David Hildenbrand (Arm)
2026-05-01 19:18 ` [PATCH v4 9/9] mm: thp: always enable mTHP support Luiz Capitulino
2026-05-06 5:46 ` Baolin Wang [this message]
2026-05-06 18:34 ` (sashiko review) " Luiz Capitulino
2026-05-13 15:58 ` David Hildenbrand (Arm)
2026-05-14 1:14 ` Baolin Wang
2026-05-03 15:02 ` [PATCH v4 0/9] " Andrew Morton
2026-05-04 19:11 ` Luiz Capitulino
2026-05-14 6:35 ` Lorenzo Stoakes
2026-05-14 12:14 ` Luiz Capitulino
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=37990f6e-61ae-4b8d-94e5-772bb6f800fe@linux.alibaba.com \
--to=baolin.wang@linux.alibaba.com \
--cc=agordeev@linux.ibm.com \
--cc=akpm@linux-foundation.org \
--cc=corbet@lwn.net \
--cc=dave.hansen@linux.intel.com \
--cc=dave.jiang@intel.com \
--cc=david@kernel.org \
--cc=djbw@kernel.org \
--cc=gerald.schaefer@linux.ibm.com \
--cc=gor@linux.ibm.com \
--cc=hca@linux.ibm.com \
--cc=lance.yang@linux.dev \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lorenzo.stoakes@oracle.com \
--cc=luizcap@redhat.com \
--cc=maddy@linux.ibm.com \
--cc=mpe@ellerman.id.au \
--cc=tsbogend@alpha.franken.de \
--cc=vishal.l.verma@intel.com \
--cc=x86@kernel.org \
--cc=ziy@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.