Adding PinnedPoolProperties cython bindings

[nirandaperera]

Minor PR that adds cython bindings for PinnedPoolProperties

[wence-]

As per #851 (comment) I thought we were going to rework this pinned pool stuff to just use the cccl types directly. In which case, does this change not go in the wrong direction in the sense of being something that we immediately have to remove/rework?

[nirandaperera]

As per #851 (comment) I thought we were going to rework this pinned pool stuff to just use the cccl types directly. In which case, does this change not go in the wrong direction in the sense of being something that we immediately have to remove/rework?

@wence- I only realized now that cccl does not expose memory pool API in cython. So, we might anyway have to manage a shim in our code. Is there a way around this?

[madsbk]

I don’t have a strong opinion, but I’m fine with us keeping both PinnedMemoryResource and HostMemoryResource until we’re sure CCCL provides everything we need.

[wence-]

As per #851 (comment) I thought we were going to rework this pinned pool stuff to just use the cccl types directly. In which case, does this change not go in the wrong direction in the sense of being something that we immediately have to remove/rework?

@wence- I only realized now that cccl does not expose memory pool API in cython. So, we might anyway have to manage a shim in our code. Is there a way around this?

CCCL doesn't provide any cython (or python) bindings for anything, and is not going to do so any time soon (if at all).

But. If we just store the pinned pool directly as a cuda::mr::any_resource and (in C++) use a cuda::pinned_memory_pool directly, then all of this polyfill will need to be changed again.

Given that our C++ PinnedMemoryPool was a temporary shim will cuda::pinned_memory_pool was in the experimental namespace in CCCL, and we've now all-but removed it anyway, it seems like it would make more sense to finish that migration on the C++ side and then figure out how to expose it in python. Rather than more polyfill that we will have to adapt.

What am I missing?