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

Nicolas Dufresne nicolas at ndufresne.ca
Wed Mar 18 13:54:05 UTC 2020

Le mercredi 18 mars 2020 à 11:05 +0100, Michel Dänzer a écrit :
> 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)

That is very interesting, thanks for sharing, could allow fixing some
issues in userspace for backward compatibility.


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