On 12/5/2015 3:10 AM, Vinod Koul wrote: > On Mon, Nov 16, 2015 at 04:53:27PM -0500, Sinan Kaya wrote: >> One of the things I'm interested in is to use a memcpy capable DMA >> engine HW to optimize user space and kernel space parameter copying. >> >> Of course, this will not be viable for all parameter sizes but I can see >> this being useful. The goal is to save power in the cost of little >> performance. >> >> Before I go and invent my own mechanism, I'd like to have ideas on what >> an acceptable solution would look like. Especially, I'm looking for a >> generic implementation that could plug into any DMA engine HW. > > Do you have a proposal on how this generic solution should look like, broad > contours of the design to start off with and we can start from that point > No, not yet. AFAIK, some of these optimization ideas have been tried by the Intel IO/AT in the past (kernel 2.6) and were rejected by the upstream. I wanted to see if anybody had better ideas these days that is upstream friendly. -- Sinan Kaya Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
