Squash 'enhance power efficiency' patches

Series of patches from NVIDIA on some critical blocking
code paths to allow the CPU to relax instead of busy spinning
thus lowering the load_average and lowering power consumption.

Signed-off-by: Sumit Singh <sumsingh@nvidia.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: flar2 <asegaert@gmail.com>