On Wed, 2016-11-16 at 11:30 +0200, Heikki Krogerus wrote: > On Tue, Nov 15, 2016 at 04:19:10PM -0800, Badhri Jagan Sridharan wrote: > > Is that too costly to have ? > > Greg, could you give your opinion. In this case we do have attribute > files that the user space can poll. Data role is the USB data role, so > host or device, and it can change for example if the partner executes > a swap. The same can happen with the power role. IMHO the uevent is cheaper. User space cannot just poll without further infrastructure. A task needs to run to poll. A uevent can be handled through established infrastructure. Sure from a kernel level it is the heavier gun, but I think this is the wrong angle of looking at this issue. Regards Oliver -- 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
