[Bug 94596] xserver-1.18.2 uses one core fully with dri3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94596

--- Comment #20 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Martin Peres from comment #19)
> (In reply to Martin Peres from comment #18)
> > I also bisected an issue to this commit, but this time not only was one core
> > fully utilized, it was also leaking RAM at an impressive rate (600 MB/s).
> 
> This would be when using the intel ddx.

That happens under the same scenario as the busyspin - if we continually
requeue multiple events to the same target vblank, we keep adding the new event
to the currently queued vblank (by reallocating the event array). That will
show up in the full-debug log quite nicely, I think.

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