[code-reflection] RFR: Hat mark buffers 1

[Gary Frost]

On Fri, 14 Feb 2025 15:33:15 GMT, Gary Frost <gfrost at openjdk.org> wrote:

> Ongoing work for moving towards buffer marking to reduce unnecessary copies. 
> 
> Here mostly infrastructural 
> 
> We moved buffer status data from the ArgSled to a trailing BufferState section at the end of each Buffer. 
> The native buffers now are kept in this buffer state section along with marker bits (host dirty, gpu dirty) 
> OpenCL + Mock + Spirv native backends now have event queues separated from the Kernel (in prep for the buffer to outlive the kernel dispatch)
> Changes tested on OpenCL (and Mock). 
> CUDA Backends very likely broken.  I will come back to those. 
> HIP also.  I need to work with AMD to sync the OpenCL changes to HIP backend. 
> 
> Buffers are still copied in and out on each dispatch.

/Integrate

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PR Comment: https://git.openjdk.org/babylon/pull/318#issuecomment-2659641975