GEM-related desktop sluggishness due to linear-time arch_get_unmapped_area_topdown()

[r6144]

在 2011-03-29二的 10:22 -0400，Jerome Glisse写道：

> Killer solution would be to have no mapping and a decent
> upload/download ioctl that can take userpage.

Doesn't this sound like GEM's read/write interface implemented by e.g.
the i915 driver?  But if I understand correctly, a mmap-like interface
should still be necessary if we want to implement e.g. glMapBuffer()
without extra copying.

r6144