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[217.140.101.70]) by mx.google.com with ESMTP id e19si1497399eje.133.2019.04.24.03.50.01 for ; Wed, 24 Apr 2019 03:50:01 -0700 (PDT) Received-SPF: pass (google.com: domain of anshuman.khandual@arm.com designates 217.140.101.70 as permitted sender) client-ip=217.140.101.70; Authentication-Results: mx.google.com; spf=pass (google.com: domain of anshuman.khandual@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=anshuman.khandual@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CFA83A78; Wed, 24 Apr 2019 03:50:00 -0700 (PDT) Received: from [10.163.1.68] (unknown [10.163.1.68]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 179573F5AF; Wed, 24 Apr 2019 03:49:58 -0700 (PDT) Subject: Re: [PATCH] docs/vm: add documentation of memory models To: Mike Rapoport , Jonathan Corbet Cc: linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <1556101715-31966-1-git-send-email-rppt@linux.ibm.com> From: Anshuman Khandual Message-ID: Date: Wed, 24 Apr 2019 16:20:02 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1556101715-31966-1-git-send-email-rppt@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit 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 04/24/2019 03:58 PM, Mike Rapoport wrote: > +To use vmemmap, an architecture has to reserve a range of virtual > +addresses that will map the physical pages containing the memory > +map. and make sure that `vmemmap` points to that range. In addition, > +the architecture should implement :c:func:`vmemmap_populate` method > +that will allocate the physical memory and create page tables for the > +virtual memory map. If an architecture does not have any special > +requirements for the vmemmap mappings, it can use default > +:c:func:`vmemmap_populate_basepages` provided by the generic memory > +management. Just to complete it, could you also include struct vmem_altmap and how it can contribute towards the physical backing for vmemmap virtual mapping. Otherwise the write up looks complete.