Hi Ben, On 10/24/2017 03:55 PM, Johannes Berg wrote: > On Tue, 2017-10-24 at 06:50 -0700, Ben Greear wrote: > [...] >> Anyone know if there is a useful way to stream events from debugfs >> and/or sysfs w/out having to busy-poll on it? > > There's relayfs, which is kinda built for that. You could even use > netlink vendor events, but I don't really think netlink is appropriate > here. > This is what I would also suggest, alas it is not clear if the events need to be processed realtime. The relayfs is used to stream the spectral data from ath9k (and afaik also from ath10k) to userspace. Very easy to implement: kernel pushes TLVs into the relayfs, userspace pulls them. It is 'realtime-enough' to display realtime spectral graphs, but since you are reading the stream in buffer-slices, you have to wait for a slice to fill up before it is available at userspace (or you flush every TLV at kernel side, which kills efficiency). That is: if you need to immediately process events, relayfs is maybe not the right choice, if you can process them in bulk, that's the most efficient way to go. Cheers, Zefir > johannes >
