This week at LWN: GEM v. TTM
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Getting high-performance, three-dimensional graphics working under Linux is quite a challenge even when the fundamental hardware programming information is available. One component of this problem is memory management: a graphics processor (GPU) is, essentially, a computer of its own with a distinct view of memory. Managing the GPU's memory - and its view of system RAM - must be done carefully if the resulting system is intended to work at all, much less with acceptable performance.
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