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spf=pass (imf29.hostedemail.com: domain of baolin.wang@linux.alibaba.com designates 115.124.30.131 as permitted sender) smtp.mailfrom=baolin.wang@linux.alibaba.com; dmarc=pass (policy=none) header.from=linux.alibaba.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1789722107; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=7cXjWzaRtWxw32n4xjyS3mKbdHRC6dQcSY+YfxC7m4k=; b=G8SV0DpiHXonyshodvfmT7kIqTcpkmtytDYyQslm+Mt3NwIaItDOWVFVyxC62CVmMHvsWE CnI8eM5Qz9Ipq4PUbmHZLJmNOW9fhNU6rqDbO3iE7iahTmwBbBVKt6o7T5OikBUABPzVSR Cccp1jYlbmUJXPWWl4g78FHnd4p/KP0= DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1789722103; h=Message-ID:Date:MIME-Version:Subject:To:From:Content-Type; bh=7cXjWzaRtWxw32n4xjyS3mKbdHRC6dQcSY+YfxC7m4k=; b=btRjn6cdcPuxWThkS5JR2V2Wr6f0tKNaRyZNvjzW8Na5cQzzLd5qIPJ+E+4TFef/gIWkCsjvBSulXa0Q4RTB5svo5zYfkaUjcV8NK7wTyo+0yQubl59Fc+2FCbbMN0jiL+8dxeFvpCgwyNGe8O5iIxw0V1zl9oEhO8ZhI6xPGVw= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R161e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033045098064;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=27;SR=0;TI=SMTPD_---0XBArCsH_1789722100; Received: from 30.74.144.124(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0XBArCsH_1789722100 cluster:ay36) by smtp.aliyun-inc.com; Fri, 18 Sep 2026 17:01:42 +0800 Message-ID: <5ae6a85d-1e74-4ef2-905b-0bc3491d1450@linux.alibaba.com> Date: Fri, 18 Sep 2026 17:01:40 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 14/14] mm: thp: always enable mTHP support To: Luiz Capitulino , 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 References: <752f528f0fed5cdc9de12b54260b0495d4e5a6cb.1789695931.git.luizcap@redhat.com> From: Baolin Wang In-Reply-To: <752f528f0fed5cdc9de12b54260b0495d4e5a6cb.1789695931.git.luizcap@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 55CC7120008 X-Stat-Signature: poeqxyfpoiueetwn9h11fe4iwrpz3xc8 X-HE-Tag: 1789722105-993549 X-HE-Meta: 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 mQAQfWpN zhVrwZM2HSVzBHYNoXG4ReBn8Mu3Q3u9znaP1ervT/18EhIfhfD8GDZuyaXx4mykvruOQnC0aGffP5Jp7UwWYwZlst+hDFFtvk/99wvGtP0BZg/2Dy3Akd1+HO70O9NzEkfUkI0uzTyXbZnZFQEQ1FxImDY3FTmbJFjcOudFUAeTivJs/Mk0420v04qhyRpyYhGAzpFbyi2QtLJ6SRvhTa1aTsj6rdBFoVBhz5b7JrRKQpNJNDF4LRDUNf7r5B0yLEzYlQt/gjpR3u/TEZKp4eUUyRsyFgaLcKfpR6+ncd7JRCJodLAPodYp60rD0MIydSQpbzNGfbXMwO0E= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 > --- LGTM. Reviewed-by: Baolin Wang