[$] Capturing stack traces asynchronously with BPF

Andrii Nakryiko led a session atthe 2024Linux Storage,Filesystem, Memory Management, and BPF Summit givinga look into the APIs for capturing stack tracesusing BPF, and how the APIs could be made more useful. BPF programs can capture thecurrent stack trace of a running process, including the portion in the kernelduring execution of a system call, which can be useful for diagnosingperformance problems, among other things. But there are substantial problems withthe existing API.