On Tue, Jun 3, 2025 at 3:10 PM Namhyung Kim <namhyung@xxxxxxxxxx> wrote: > > 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. > > Good point. Maybe BPF folks have some idea? > > Anyway the current code generates them together in a function. > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/events/core.c?h=v6.15#n9825 It certainly does, yeah. But I don't want to have that become another instance of https://www.hyrumslaw.com/. > > Can you say more about why the duplicated records concern you? > > More data means more chance to lost something. I don't expect this is > gonna be a practical concern but in general we should pursue less data. That makes sense. In this case, it will only show up for BPF programs that define "bpf_metadata_" variables (which is already an opt-in action), and the number of variables a given program defines is likely to be quite small. So I think the cost of the marginal increase in data generated is outweighed by the usability and reliability benefits of being able to match these events 1:1 with the KSYMBOL events. If this proves to be a problem in practice, it can be revisited. Blake
