On Thu, 25 Oct 2012, Ulrich Eckhardt wrote: > Am 25.10.2012 03:24, schrieb Ming Lei: > >> Lei, do you have any doc describing how to use those tracepoints? > > > > Hi Bjorn Helgaas, > > > > Firstly, please enable these tracepoints via below > > > > echo 1 > /sys/kernel/debug/tracing/events/rpm/enable > > > > then store the trace event result by below once you make sure your interested > > events are completed: > > > > echo 0 > /sys/kernel/debug/tracing/events/rpm/enable > > cp /sys/kernel/debug/tracing/trace /media/ram/rpm-trace > > > Hi, > > I have created a trace according this description. Therefore I have > rebooted my system, enabled the trace and inserted and removed the > SD-card until the controller stops working. During this procedure I > observed that the controller seems to be more stable. I had to insert > and remove the SD-card several times until the controller stopped > working. Normally the controller will fail on the first attempt. Also I > had the impression (not sure about this since I have not measured it) > that the card reader reads the data faster. > > I append the gzipped trace and the corresponding dmesg output. There's a much more straightforward way of telling when a PCI-based USB host controller gets suspended or resumed. Just enable CONFIG_USB_DEBUG; then there will appropriate lines in the dmesg log. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
