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List:       fedora-devel-list
Subject:    Re: F37 proposal: Add -fno-omit-frame-pointer to default compilation flags (System-Wide Change propo
From:       Florian Weimer <fweimer () redhat ! com>
Date:       2022-11-09 10:29:35
Message-ID: 87y1skfmk0.fsf () oldenburg ! str ! redhat ! com
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* Demi Marie Obenour:

> On 11/8/22 18:46, Frank Ch. Eigler wrote:
>> Demi Marie Obenour <demiobenour@gmail.com> writes:
>> 
>>> Three other options I can think of:
>>> [...]
>> 
>> Another one:
>> 
>>   4. Speed up out-of-context backtracer(s), possibly consuming
>>      kernel-perf-ringbuffer stack dumps, or possibly using another
>>      event source to trigger and work via ptrace and /proc/$pid/mem
>> 
>> - FChE
>
> Kernel stack dumps will not work for programs (such as OCaml 5.0)
> that use segmented stacks.  A userspace ptracer might work if it
> is only woken up when absolutely necessary, but I suspect it would
> be slow due to syscall overhead.  That is why I suggested the vDSO
> dumper: it would run from the process's own context.

I'm pretty sure most of the sysprof users are not interested in
profiling OCaml programs.  So that limitation should not block sysprof
improvements, I think.

Thanks,
Florian
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