[PATCH] present: Queue flips for later execution. Begging for review.

Keith Packard keithp at keithp.com
Wed Jun 4 13:15:04 PDT 2014

Chris Wilson <chris at chris-wilson.co.uk> writes:

> Neither the GPU or mmio pageflip ioctl stall due to outstanding rendering,
> except as when it is required to rewrite the PTEs. We could move that to
> a wq, or the buffers can be pre-emptively moved to the display cache
> domain before rendering.

Right, it's reasonable for the kernel to not care whether the buffer is
idle or not when flipping. However, the application *does* care, and so
we need a way to not flip until rendering is complete. Whether that's
additional mechanism in the kernel, or additional code up in user space
is the question.

keith.packard at intel.com
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