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[45.79.88.28]) by mx.google.com with ESMTPS id i33si18103504pld.374.2019.04.24.09.14.57 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 24 Apr 2019 09:14:57 -0700 (PDT) Received-SPF: pass (google.com: domain of corbet@lwn.net designates 45.79.88.28 as permitted sender) client-ip=45.79.88.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of corbet@lwn.net designates 45.79.88.28 as permitted sender) smtp.mailfrom=corbet@lwn.net Received: from lwn.net (localhost [127.0.0.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ms.lwn.net (Postfix) with ESMTPSA id 8E6621AA; Wed, 24 Apr 2019 16:14:56 +0000 (UTC) Date: Wed, 24 Apr 2019 10:14:55 -0600 From: Jonathan Corbet To: Mike Rapoport Cc: linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] docs/vm: add documentation of memory models Message-ID: <20190424101455.12cd407e@lwn.net> In-Reply-To: <1556101715-31966-1-git-send-email-rppt@linux.ibm.com> References: <1556101715-31966-1-git-send-email-rppt@linux.ibm.com> Organization: LWN.net MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit 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 Wed, 24 Apr 2019 13:28:35 +0300 Mike Rapoport wrote: > Describe what {FLAT,DISCONTIG,SPARSE}MEM are and how they manage to > maintain pfn <-> struct page correspondence. Quick question: should this document perhaps mention that DISCONTIGMEM appears to be on its way out? Thanks, jon