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aphics Translation Table to eliminate copies when doing windowed double buffer updates for GL applications. Since then, two X extensions have been written which provide the necessary infrastructure to make that possible in a composited desktop environment. This is a cross-project system involving: * Linux KernelAPIs for performing low-level graphics page table manipulations. * Two new X extensions, DRI3 and Present that together replace DRI2 and allow these performance improvements. * Mesa OpenGL system additions, both for basic DRI3/Present support as well as the necessary viewport offset changes. * Gnome Shell modifications to take advantage of DRI3/Present. This presentation will describe the changes that were necessary across the full software stack, from Linux kernel, through the DRI, Mesa, X server and Gnome Shell compositing manager. A full demonstration of the completed system will be presented along with performance data describing the benefits of the new architecture. Keith Packard Keith Packard has been developing open source software since 1986, focusing on the X Window System since 1987, designing and implementing large parts of the current implementation. He is currently a Principal Engineer with Intel's Open Source Technology Center. Keith received a Usenix Lifetime Achievement award in 1999, an O'Reilly Open Source award in 2011 and sits on the X.org foundation board. http://lca2014.linux.org.au/schedule/30050/view_talk?day=thursday