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pinned memory opencl, has anybody successfully used it?

I used the CL_MEM_ALLOC_HOST_PTR flag with my clCreateBuffer calls, but the Compute Profiler shows all my "host mem transfer type" as being Pageable. I tried it in two different kernel setups, but the profiler wouldn't show that I was using pinned memory.

Is it just really random when a kernel gets to use pinned memory? Is it constrained by something? I am guessing the size of the buffer matters. I tried one buffer of a size of 10,000 floats and I still got Pageable memory. Let me know what you all think.

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