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[69.159.169.238]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8a59691580bsm21345376d6.26.2026.04.02.04.56.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 02 Apr 2026 04:56:38 -0700 (PDT) Message-ID: <8d03a508-5836-4001-8eb8-b216251dc29d@redhat.com> Date: Thu, 2 Apr 2026 07:56:37 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 00/11] mm: thp: always enable mTHP support To: "David Hildenbrand (Arm)" , 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 References: <835725cc-1670-45ae-bf58-593aadec6b88@kernel.org> From: Luiz Capitulino In-Reply-To: <835725cc-1670-45ae-bf58-593aadec6b88@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: UbcMjkO3wVsyDx9Npte_iFhnQYRA2tu6JrFtvMmC2PQ_1775130999 X-Mimecast-Originator: redhat.com Content-Language: en-US, en-CA Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 926E54000D X-Stat-Signature: z5g49rfcxnqu4pz13ue5146wyuajs8o9 X-Rspam-User: X-HE-Tag: 1775131001-334299 X-HE-Meta: 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 SaZxixXT ZVtJgnCfrHgU0divN+xpp8QAa0IG7rIcfANcgUA4K4HcHuUkxKyiBdI8u7PLKdeBsXkBRrKZ0hGN0mjEHcaAxIwyua/M6qHQJvB5SswPI2Kc4z/0OPhqPVNmFQrVC0LSdIIziQ90ZyuXmGn23u77HEMzLYq2x6+Qr6ZN7MRlQLfVb5uc79yJzjfw/HoR2cOB+gcwTFve1xXSM6LgO1u4EPlGr4C07g+R2kfSdjqGWcddCPgahLBbzFnR/wYj3uUMrtIdyfYsv+7LNwprKB6KpNVWz2E5tkxAPORKSHwt9A47AmCR/xKAYBrIYFq1SZ0AfFDikKfEX7pYaBR+rZjooXa1kFwSN9yil2h/t3bCa5bJNfuhSaEOdQGRikWY3R7y5s8DXaYAlgrKcvm8= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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).