zeroshade commented on code in PR #40699:
URL: https://github.com/apache/arrow/pull/40699#discussion_r1537810069


##########
cpp/src/arrow/gpu/cuda_memory.cc:
##########
@@ -501,5 +502,27 @@ Result<std::shared_ptr<MemoryManager>> 
DefaultMemoryMapper(ArrowDeviceType devic
   }
 }
 
+Result<std::shared_ptr<MemoryManager>> DefaultGPUMemoryMapper(int64_t 
device_id) {
+  ARROW_ASSIGN_OR_RAISE(auto device, arrow::cuda::CudaDevice::Make(device_id));
+  return device->default_memory_manager();
+}

Review Comment:
   That seems reasonable for now. We can update and handle the other types in a 
future update



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