BPF_TRACE_MAX_PROGS | BPFTRACE_MAX_BPF_PROGS: Limit enable by app level or another limit is used at kernel level

[kevin-intri-form3]

Recently we found this macro #define BPF_TRACE_MAX_PROGS 64 and we don't know if that overlap and limit this BPFTRACE_MAX_BPF_PROGS.

Do you know if they are correlated or the kernel one has the actual limit?

Thanks.

[danobi]

Hi, the two are unrelated. The naming is just a coincidence. It looks like the kernel BPF_TRACE_MAX_PROGS controls how many progs can be attached to a single perf event. While the bpftrace BPFTRACE_MAX_PROGS controls how many programs bpftrace will codegen.

[kevin-intri-form3]

Thanks @danobi!