Hi Namhyung, On Tue, Jun 3, 2025 at 2:44 PM Namhyung Kim <namhyung@xxxxxxxxxx> wrote: > > > IIUC the metadata is collected for each BPF program which may have > > > multiple subprograms. Then this patch creates multiple PERF_RECORD_ > > > BPF_METADATA for each subprogram, right? > > > > > > Can it be shared using the BPF program ID? > > > > In theory, yes, it could be shared. But I want to be able to correlate them > > with the corresponding PERF_RECORD_KSYMBOL events, and KSYMBOL events for > > subprograms don't have the full-program ID, so I wouldn't be able to do that. > > It's unfortunate that KSYMBOL doesn't have the program ID, but IIRC the > following BPF_EVENT should have it. I think it's safe to think KSYMBOLs > belong to the BPF_EVENT when they are from the same thread. Hmmm. Is that documented and tested anywhere? Offhand it sounds like an implementation detail that I wouldn't feel great about depending on - certainly not without a strong guarantee that it wouldn't change. Can you say more about why the duplicated records concern you? Blake
