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Mesa (computer graphics)
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==== Explicit fencing ==== A kind of memory barrier that separates one buffer from the rest of the memory is called a fence. Fences are there to ensure that a buffer is not being overwritten before rendering and display operations have completed on it. Implicit fencing is used for synchronization between graphics drivers and the GPU hardware. The fence signals when a buffer is no longer being used by one component so it can be operated on or reused by another. In the past the Linux kernel had an implicit fencing mechanism, where a fence is directly attached to a buffer (cf. GEM handles and FDs), but userspace is unaware of this. Explicit fencing exposes fences to userspace, where userspace gets fences from both the Direct Rendering Manager (DRM) subsystem and from the GPU. Explicit fencing is required by Vulkan and offers advantages for tracing and debugging. Linux kernel 4.9 added Android's synchronization framework to mainline.<ref>{{cite web |url=https://lwn.net/Articles/702339/ |title=Bringing Android explicit fencing to the mainline |date=5 October 2016 |publisher=[[LWN.net]] }}</ref>
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