[RFC PATCH 0/2] dma-unmap: allow to only unmap completed DMA buffer

[Ming Lei]

This patchset tries to loose the check on DMA buffer size in check_unmap()
of dma-debug first, then only unmap the actual completed DMA buffer in USB
unmap path.

Considered that DMA unmapping often runs in hard irq context, the patch set
may save irq handling time. And the improvement can be observed on
ARMv7(Pandaboard) with the chage, at average ~25us is saved about ehci irq
handling under usbnet ping test case.

Thanks,
--
Ming Lei


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/