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The compositor maintains a ring of shared fences with the X server in order to properly synchronize rendering between the X server and the compositor's GPU channel. When all of the fences have been used, the compositor needs to reset one so that it can be reused. It does this by first waiting on the CPU for the fence to become triggered, and then sending a request to the X server to reset the fence. If the compositor's GPU channel is busy processing other work (e.g. the desktop switcher animation), then the X server may process the reset request before the GPU has consumed the fence. This causes the GPU channel to hang. Fix the problem by having the compositor's GPU channel trigger its own fence after waiting for the X server's fence. Wait for that fence on the CPU before sending the reset request to the X server. This ensures that the GPU has consumed the X11 fence before the server resets it. Signed-off-by: Aaron Plattner <aplattner@nvidia.com> https://bugzilla.gnome.org/show_bug.cgi?id=728464 |
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