I'm putting together a document for Kernel Summit that describes the issues around graphics device drivers. The kernel developers are currently making first pass comments on it. As soon as I fold their comments in I'll post it to fb-dev, dri-dev and wherever else is appropriate for the next round of comments. Nobody is proposing final solutions yet, I'm just trying to collect everyone's opinion.
Memory management of AGP/VRAM space is identified as a problem area but nobody has proposed any solution for it. Any solution needs to take into account FB, DRM, mesa-solo and existing Xfree. There have been a few minor comments both ways for doing it in a driver and a library.
That's not entirely true. I made a proposal last February (search the dri-devel archives for "texmem-0-0-2") that used a combination of in-kernel and user-space. Basically, the memory management mechanism is implemented in-kernel, but the policy is implemented in user-space.
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