This is the best summary I could come up with:

It’s a pretty big deal and should make NVIDIA GPU users especially happy in future.

Xwayland will likely remain an important component in that stack for some time yet, and therefore I feel that this work will be of long-term benefit to the community more broadly.

The design takes inspiration from the proposed Wayland wp_linux_explicit_sync_v2 protocol [1], making use of DRM syncobjs as the main primitive.

One, having both X11 and Wayland use a similar mechanism for explicit sync will simplify development for client-side drivers, and two, it will also hopefully make it fairly straight-forward for Xwayland itself to add support for the Wayland explicit sync protocol, presumably once it’s more widely implemented by compositors.

I’ve tried to keep this initial proposal focused on getting a usable GPU synchronization primitive in place, and adding support for it to the PresentPixmap request, believing this to be the most important part of the presentation pipeline.

Not much is left to get everything all hooked up nicely, with an upcoming NVIDIA beta driver that should have support for it next month.

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