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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1q2vXv-003tpc-6G; Sat, 27 May 2023 15:09:31 +0000 Date: Sat, 27 May 2023 16:09:31 +0100 From: Matthew Wilcox To: Mike Rapoport Cc: Vishal Moola , Andrew Morton , linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org Subject: Re: [PATCH v2 05/34] mm: add utility functions for ptdesc Message-ID: References: <20230501192829.17086-1-vishal.moola@gmail.com> <20230501192829.17086-6-vishal.moola@gmail.com> <20230525090956.GX4967@kernel.org> <20230525202537.GA4967@kernel.org> <20230527104144.GH4967@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230527104144.GH4967@kernel.org> X-Rspamd-Queue-Id: 4FA651A0025 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: hotfcpgdrm9ud54darha7kmrjaoe7qh4 X-HE-Tag: 1685200179-383262 X-HE-Meta: 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 0NYeJ7xv mWVdT1YNqr3B5VMaSSFObMIypRV2UVxcAPE6tBMtRcdzWk3FJM1hNSd65vQTKnS0aknYVpZHqJSx9pWQGPseZME2kX+ObFwy78VPmA0w960zY5re/NfeINh0ULMvTFgogIib7IwazC6yaE06u3LD2Qai1KJg6mXZuWIS1mF68WKuwnNWBpIAMrU39GS7Xj4B+0D3J6+OGLx0c/WGcP226cFYVYg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sat, May 27, 2023 at 01:41:44PM +0300, Mike Rapoport wrote: > Sorry if I wasn't clear, by "page table page" I meant the page (or memory > for that matter) for actual page table rather than struct page describing > that memory. > > So what we allocate here is the actual memory for the page tables and not > the memory for the metadata. That's why I think the name ptdesc_alloc is > confusing. But that's going to be the common pattern in the Glorious Future. You allocate a folio and that includes both the folio memory descriptor and the 2^n pages of memory described by that folio. Similarly for all the other memory descriptors.