There's few ongoing kprobe multi features that I'd like to give an update about and discuss. - Support to execute bpf program for both entry and return probes. This way we don't need to create 2 links when we need to run bpf program on entry/return probes of the same function, first rfc posted [0]. - In addition to above feature introduce shared 'session' data between entry and exit probe accessible from bpf program, originally discussed in [1]. - Allow to use per program re-entry checks instead of current hard coded per cpu re-entry check, or just change to per program check directly. - There's ongoing development of patchset moving fprobe implementation from function tracer on top of fgraph tracer by Masami Hiramatsu [2]. As kprobe multi link is implemented via fprobe I'd like to give an update what this change means for kprobe multi link. [0] https://lore.kernel.org/bpf/20240207153550.856536-1-jolsa@xxxxxxxxxx/ [1] https://lore.kernel.org/bpf/CAEf4Bzb6sPXAtDVke=CtCXev0mxhfgEG_O-xUA-e9-8NnbBtJQ@xxxxxxxxxxxxxx/ [2] https://lore.kernel.org/bpf/170723204881.502590.11906735097521170661.stgit@devnote2/
