On 6/18/22 13:22, Frank Ch. Eigler wrote:
>
> demiobenour wrote:
>
>>> (Note FWIW that systemtap's kernel runtime does DWARF-based unwinding
>>> for the kernel and user-designated userspace executables and
>>> shared-libraries on demand, and it's not particularly slow at it.)
>>
>> How does it do that? Does it have a kernel-mode DWARF unwinder?
>
> Yes.
>
> # stap -e 'probe timer.profile { if(user_mode()) {
> print_ubacktrace() println()
> } }' \
> -d /lib64/libc.so.6 -d /path/to/other/library --ldd
>
> see also, e.g.:
> https://sourceware.org/systemtap/man/stap.1.html
> https://sourceware.org/systemtap/tapsets/API-print-backtrace-fileline.html
> https://sourceware.org/systemtap/tapsets/API-print-ubacktrace-brief.html
>
>> Is this trick something that perf could use as well?
>
> Yes, but this approach is unlikely to be adopted there.
Why is this?
--
Sincerely,
Demi Marie Obenour (she/her/hers)
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