[$] Reliable user-space stack traces with SFrame

A complete stack trace is needed for a number of debugging and optimizationtasks, but getting such traces reliably can be surprisingly challenging.At the 2023 Linux Storage, Filesystem,Memory-Management and BPF Summit, Steve Rostedt and Indu Bhagatdescribed a mechanism called SFrame that enables the creation of reliableuser-space stack traces in the kernel withoutthe memory and run-time overhead of some other solutions.