Ram become shared VEAM in ubuntu

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https://nvidia.custhelp.com/app/answers/detail/a_id/5490/~/system-memory-fallback-for-stable-diffusion#:~:text=In%20driver%20536.40,%20we%20implemented%20a%20new%20method%20to%20allow%20an%20application%20to%20use%20shared%20memory%20in%20cases%20that%20exhausted%20the%20GPU%20memory

How do I increase the shared GPU memory allocation multiplicator?

Shared GPU memory is computed by CPU memory ÷ 2 And I want it to be equal to CPU memory. I need it for my pinned memory with cudaMallocHost.

the answers mean my ram can become shared VEAM in win10
i have 32GB ram and 4GB vram in win10,so now i can get 20GB vram.
my question is how ram become shared VEAM in ubuntu ?thank you

i need this:
In driver 536.40, nvidia implemented a new method to allow an application to use shared memory in cases that exhausted the GPU memory. This enabled applications which previously crashed when running out of GPU memory to continue to run, albeit at lower speeds. The switch to use shared memory occurs when running close to maxing out GPU memory to allow for a seamless transition.