[Mesa-dev] Plumbing explicit synchronization through the Linux ecosystem

Michel Dänzer michel at daenzer.net
Wed Mar 18 10:05:48 UTC 2020

On 2020-03-17 6:21 p.m., Lucas Stach wrote:
> That's one of the issues with implicit sync that explicit may solve: 
> a single client taking way too much time to render something can 
> block the whole pipeline up until the display flip. With explicit 
> sync the compositor can just decide to use the last client buffer if 
> the latest buffer isn't ready by some deadline.

FWIW, the compositor can do this with implicit sync as well, by polling
a dma-buf fd for the buffer. (Currently, it has to poll for writable,
because waiting for the exclusive fence only isn't enough with amdgpu)

Earthling Michel Dänzer               |               https://redhat.com
Libre software enthusiast             |             Mesa and X developer

More information about the wayland-devel mailing list