[$] SFrame: fast, low-overhead stack traces

Getting a stack trace of a running program is useful in a variety ofscenarios: tracing, profiling, debugging, performance tuning, and more.There are existing mechanisms to get stack traces, but there are somedownsides to them; the "Simple Frame" (SFrame) stack-trace format cameabout to address the shortcomings in the other techniques. Back in May,Steve Rostedt and Indu Bhagat gave a talk aboutSFrame support in the kernel as part of LSFMM+BPF; a few days later, Bhagat gavea more general talk about SFrame (YouTube video)at OpenSource Summit North America in Vancouver. That second talk helped fillin some other aspects of SFrame and the overall stack-tracing picture.