Comment # 60
on bug 106175
from Brandon Wright
> There are larger problems within amdgpu_dm's commit tail that if addressed > should resolve this issue for compton I'd imagine. Honestly, I don't care about compton. I don't think you realize the effects of this issue. It seriously affects performance when the cursor is in motion with any page-flipping application. GNOME and KDE, while the window motion is less affected, stutter in composited client applications. > This is a nice attempt but it only resolves the problem because it relies on > the blocking behavior in atomic check that amdgpu_dm currently does > (and shouldn't be doing). > > Asynchronous updates can and will occur in parallel with other commits on > worker threads. Without the wait in atomic_check you'll see the IGT legacy > cursor tests break with this patch (and there will probably be system faults > as well). You'd have to point this out to me, because I didn't see anything that would obviously block, unless it's buried in dc_validate_plane. Since, as you say, atomic_check is blocking for now, why not work around this issue with a tiny change. If someone ever gets around to doing things the correct way it's no big deal to remove.
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