> Now I still don't understand how the dso/map support "/proc/kallsyms" and > have no idea to fix this issue, though I spent some time to look into it.
The way this is supported is that at record time, pseudo mmap records are created for the kernel. But depending on permissions these might not get created. This isn't just an ETM issue, it can happen on Intel too. What do you see in "perf report -D", do you see a PERF_RECORD_MMAP record for "[kernel.kallsyms]_text" and possibly some others for loadable kernel modules in /lib/modules? Does it all work if you run perf record as sudo? Or if you do sudo sysctl kernel.kptr_restrict=0 before you run perf record? Al IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
