Bug#1088153: linux-perf: "perf script" is extremely slow

[Salvatore Bonaccorso <carnil@debian.org>]

Contol: tags -1 + moreinfo unreproducible

Hi Ralf,

On Sun, Nov 24, 2024 at 10:45:50AM +0100, Ralf Jung wrote:
> Package: linux-perf
> Version: 6.11.9-1
> Severity: normal
> 
> Dear Maintainer,
> 
> I am trying to use cargo-flamegraph to produce a flamegraph from perf data. That
> invokes "perf script" and that has now been running already 15 minutes on a tiny
> perf file containing 3300 samples. Something is extremely slow here, making some
> kinds of perf analysis basically impossible.
> 
> Looking around for perf performance issues, I found
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=911815, which however is
> supposed to have been fixed years ago. But I still see thousands and thousands
> of addr2line processes being spawned, so somehow
> <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=be8ecc57f180415e8a7c1cc5620c5236be2a7e56>
> either did not have the desired effect or is not present in current kernels any
> more?
> 
> When I finally killed "perf script", I saw a lot of this kind of output:
> 
> addr2line /home/r/.debug/.build-id/37/8f73d84f9d89f55dfc18a9ab84bce321cd9b09/elf: could not read first record
> 
> I don't know whether that could cause the slowdown, or what could cause that error.

Is this still something you can reproduce?

Regards,
Salvatore