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, tglx@kernel.org,
mingo@redhat.com, bp@alien8.de, hughd@google.com,
dave.hansen@linux.intel.com, djbw@kernel.org,
vishal.l.verma@intel.com, dave.jiang@intel.com,
akpm@linux-foundation.org, yintirui@huawei.com, dev.jain@arm.com,
usama.arif@linux.dev
Subject: Re: [PATCH v8 14/14] mm: thp: always enable mTHP support
Date: Fri, 18 Sep 2026 17:01:40 +0800 [thread overview]
Message-ID: <5ae6a85d-1e74-4ef2-905b-0bc3491d1450@linux.alibaba.com> (raw)
In-Reply-To: <752f528f0fed5cdc9de12b54260b0495d4e5a6cb.1789695931.git.luizcap@redhat.com>
On 9/18/26 9:45 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>
> ---
LGTM.
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
next prev parent reply other threads:[~2026-09-18 9:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-18 1:45 [PATCH v8 00/14] " Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 01/14] docs: tmpfs: remove implementation detail reference Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 02/14] mm: shmem: shmem_getattr(): set blksize to highest supported THP order Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 03/14] mm: introduce pgtable_has_pmd_leaves() Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 04/14] drivers: dax: use pgtable_has_pmd_leaves() Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 05/14] drivers: nvdimm: " Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 06/14] mm: debug_vm_pgtable: " Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 07/14] mm: shmem: allow THP support determination at folio allocation time Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 08/14] s390: move has_transparent_hugepage() out of THP guard Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 09/14] powerpc: " Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 10/14] mips: " Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 11/14] x86: " Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 12/14] treewide: introduce arch_has_pmd_leaves() Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 13/14] mm: replace thp_disabled_by_hw() with pgtable_has_pmd_leaves() Luiz Capitulino
2026-09-18 1:45 ` [PATCH v8 14/14] mm: thp: always enable mTHP support Luiz Capitulino
2026-09-18 9:01 ` Baolin Wang [this message]
2026-09-18 10:37 ` [PATCH v8 00/14] " Usama Arif
2026-09-18 14:01 ` Luiz Capitulino
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