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[70.52.229.124]) by smtp.gmail.com with ESMTPSA id d23-20020ac847d7000000b003e4ee0f5234sm555068qtr.87.2023.04.13.08.36.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Apr 2023 08:36:39 -0700 (PDT) Date: Thu, 13 Apr 2023 11:36:37 -0400 From: Peter Xu To: David Hildenbrand Cc: Lokesh Gidra , Axel Rasmussen , Andrew Morton , "open list:MEMORY MANAGEMENT" , linux-kernel , Andrea Arcangeli , "Kirill A . Shutemov" , "Kirill A. Shutemov" , Brian Geffon , Suren Baghdasaryan , Kalesh Singh , Nicolas Geoffray , Jared Duke , android-mm , Blake Caldwell , Mike Rapoport Subject: Re: RFC for new feature to move pages from one vma to another without split Message-ID: References: <27ac2f51-e2bf-7645-7a76-0684248a5902@redhat.com> <3059388f-1604-c326-c66f-c2e0f9bb6cbf@redhat.com> MIME-Version: 1.0 In-Reply-To: <3059388f-1604-c326-c66f-c2e0f9bb6cbf@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline X-Rspam-User: X-Rspamd-Queue-Id: 996198000D X-Rspamd-Server: rspam01 X-Stat-Signature: 4k6qoucq5qtkmguhp74gk97191afrgr5 X-HE-Tag: 1681400202-818222 X-HE-Meta: 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 0SsdA8ze bU19u7nKfPEsEBCxrHqHL3ei/Opo2o8L4I+DyOjQdFdyNmazQJpeCYl7Fs4skaqgn2xpsQ9ByExRONofjHz+QUfb8wpqqKTGFPk7ue+k/zSOX2KS1rSF8mJ2wKLuD1/OyViwzR7i0HRrCA2YgxVu1vrIBuqG33oq/rppr//A9mjfydFdamJmrIisqvsAh+hOz/AqZ7x5sVWyrWqDCldMfHPiYHavdgqSpXDp1acit0rjE9wte82IadH3TjuQ2akJZeA/RuA+S48f45IbscPyko/dGkAXavY5w9LiDPonpBwx+Gl7iyHKXmtSoiiHrYgzBGJu3GscLo1rwdJiNdf6F6qwCn7UoRlkxKkZ556Xm9C1WFVtPO+DSnhXPKQT3X928Bbo1eaAg7Wl6hI/pITaJdo5653tA0w1KBWm357NA5Gy7kcrQZ1pbb/FUi/MYEHoO9mdm X-Bogosity: Ham, tests=bogofilter, spamicity=0.009742, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Apr 13, 2023 at 10:10:44AM +0200, David Hildenbrand wrote: > So instead, we consider the whole address space as a virtual, anon file, > starting at offset 0. The pgoff of a VMA is then simply the offset in that > virtual file (easily computed from the start of the VMA), and VMA merging is > just the same as for an ordinary file. Interesting point, thanks! -- Peter Xu