Re: F37 proposal: Add -fno-omit-frame-pointer to default compilation flags (System-Wide Change proposal)

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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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