hi, I'm hitting performance issue and soft lock ups with the new version of the patchset and the reason seems to be kallsyms lookup that we need to do for each btf id we want to attach I tried to change kallsyms_lookup_name linear search into rbtree search, but it has its own pitfalls like duplicate function names and it still seems not to be fast enough when you want to attach like 30k functions so I wonder we could 'fix this' by storing function address in BTF, which would cut kallsyms lookup completely, because it'd be done in compile time my first thought was to add extra BTF section for that, after discussion with Arnaldo perhaps we could be able to store extra 8 bytes after BTF_KIND_FUNC record, using one of the 'unused' bits in btf_type to indicate that? or new BTF_KIND_FUNC2 type? thoughts? thanks, jirka
