[PATCH] drm/syncobj: add sync obj wait interface. (v6)

[Christian König]

Am 12.07.2017 um 17:53 schrieb Jason Ekstrand:
> [SNIP]
>
>     Is that easier than just waiting in the kernel, I'm not sure how
>     optimised we need this path to be.
>
>
> I don't think so.  I think it's more-or-less the same code regardless 
> of how it's done.  The advantage of doing it in the kernel is that 
> it's standardized (we don't have to both go write that userspace code) 
> and it doesn't have the problems stated above.

Ok, I'm convinced. The next price question is then how do we do it?

I mean writing an IOCTL to wait for a fence to appear is simple, but do 
we also need to wait for a fence to change?

As long as waits don't consume fences that might be rather tricky.

Christian.
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