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cargo-trace reviews and mentions
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Dwarf-Based Stack Walking Using eBPF
Are the authors here? Thanks for this! I'm always thrilled to see advances in profiling tools.
I'm curious what they have to say about complexity/necessity of interpreting all of DWARF. cargo-trace (an neat and conceptually similar but abandoned project, I think) [1] says:
> It can be empirically determined that almost all dwarf programs consist of a single instruction and use only three different instructions. rip+offset, rsp+offset or *cfa+offset, where cfa is the rsp value of the previous frame. The result of the unwinding is an array of instruction pointers.
Do you find this to be true? Is more complex interpreting of DWARF necessary?
And in the lkml thread linked from the article, Linus is extremely pessimistic about DWARF unwinding, [2] I'm sure not without justification. He's talking about kernel stacks, and I think the trade-off is different when you're trying to profile existing userspace applications and libraries compiled and implemented however, but nonetheless I'm curious to hear the authors say how applicable they think his points are.
[1] https://github.com/dvc94ch/cargo-trace
[2] https://lkml.org/lkml/2012/2/10/356
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The primary programming language of cargo-trace is Rust.
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