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[2003:cb:c734:b800:12c4:65cd:348a:aee6]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4391dc9ffd8sm151856745e9.10.2025.02.10.10.45.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Feb 2025 10:45:11 -0800 (PST) Message-ID: Date: Mon, 10 Feb 2025 19:45:09 +0100 Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 16/20] huge_memory: Add vmf_insert_folio_pmd() To: Alistair Popple , akpm@linux-foundation.org, dan.j.williams@intel.com, linux-mm@kvack.org Cc: Alison Schofield , lina@asahilina.net, zhang.lyra@gmail.com, gerald.schaefer@linux.ibm.com, vishal.l.verma@intel.com, dave.jiang@intel.com, logang@deltatee.com, bhelgaas@google.com, jack@suse.cz, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, dave.hansen@linux.intel.com, ira.weiny@intel.com, willy@infradead.org, djwong@kernel.org, tytso@mit.edu, linmiaohe@huawei.com, peterx@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com, chenhuacai@kernel.org, kernel@xen0n.name, loongarch@lists.linux.dev References: <9f10e88441f3cb26eff6be0c9ef5997844c8c24e.1738709036.git-series.apopple@nvidia.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 04.02.25 23:48, Alistair Popple wrote: > Currently DAX folio/page reference counts are managed differently to normal > pages. To allow these to be managed the same as normal pages introduce > vmf_insert_folio_pmd. This will map the entire PMD-sized folio and take > references as it would for a normally mapped page. > > This is distinct from the current mechanism, vmf_insert_pfn_pmd, which > simply inserts a special devmap PMD entry into the page table without > holding a reference to the page for the mapping. > > It is not currently useful to implement a more generic vmf_insert_folio() > which selects the correct behaviour based on folio_order(). This is because > PTE faults require only a subpage of the folio to be PTE mapped rather than > the entire folio. It would be possible to add this context somewhere but > callers already need to handle PTE faults and PMD faults separately so a > more generic function is not useful. > > Signed-off-by: Alistair Popple Nit: patch subject ;) > > --- > > Changes for v7: > > - Fix bad pgtable handling for PPC64 (Thanks Dan and Dave) Is it? ;) insert_pfn_pmd() still doesn't consume a "pgtable_t *" But maybe I am missing something ... -- Cheers, David / dhildenb