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: 14+ 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
2026-05-01 19:18 ` [PATCH v4 3/9] drivers: dax: use pgtable_has_pmd_leaves() 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
2026-05-01 19:18 ` [PATCH v4 7/9] treewide: introduce arch_has_pmd_leaves() Luiz Capitulino
2026-05-01 19:18 ` [PATCH v4 8/9] mm: replace thp_disabled_by_hw() with pgtable_has_pmd_leaves() Luiz Capitulino
2026-05-01 19:18 ` [PATCH v4 9/9] mm: thp: always enable mTHP support Luiz Capitulino
2026-05-06 5:46 ` Baolin Wang [this message]
2026-05-03 15:02 ` [PATCH v4 0/9] " Andrew Morton
2026-05-04 19:11 ` Luiz Capitulino
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