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With Full PPGTT, each new fd creates a new context and thus a new PPGTT, so we have to reduce the number of simultaneous fds or face OOM problems. For every new PPGTT, its PDEs are stored in the GGTT which imposes a limit of 1024 new contexts. We want to leave at least 1/4 of the GGTT available for "important" stuff like scanout buffers, so never open more than 768 fds. v2: Unconditionally use the lower limit, as suggested by Daniel Vetter Signed-off-by: Oscar Mateo <oscar.mateo@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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