Hi Matwey, Thank you for the patches. For the whole series, Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> On Friday, 9 November 2018 21:03:25 EET Matwey V. Kornilov wrote: > DMA cocherency slows the transfer down on systems without hardware coherent > DMA. In order to demontrate this we introduce performance measurement > facilities in patch 1 and fix the performance issue in patch 2 in order to > obtain 3.3 times speedup. > > Changes since v5: > * add dma_sync_single_for_device() as required by Laurent Pinchart > > Changes since v4: > * fix fields order in trace events > * minor style fixes > > Changes since v3: > * fix scripts/checkpatch.pl errors > * use __string to store name in trace events > > Changes since v2: > * use dma_sync_single_for_cpu() to achive better performance > * remeasured performance > > Changes since v1: > * trace_pwc_handler_exit() call moved to proper place > * detailed description added for commit 1 > * additional output added to trace to track separate frames > > Matwey V. Kornilov (2): > media: usb: pwc: Introduce TRACE_EVENTs for pwc_isoc_handler() > media: usb: pwc: Don't use coherent DMA buffers for ISO transfer > > drivers/media/usb/pwc/pwc-if.c | 69 +++++++++++++++++++++++++++++++-------- > include/trace/events/pwc.h | 65 +++++++++++++++++++++++++++++++++++++++ > 2 files changed, 121 insertions(+), 13 deletions(-) > create mode 100644 include/trace/events/pwc.h -- Regards, Laurent Pinchart
