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

From	Ralf Jung <post@ralfj.de>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1088153: linux-perf: "perf script" is extremely slow
Date	2024-11-24 11:00 +0100
Message-ID	<JMhzk-bd56-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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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.


Kind regards,
Ralf

-- System Information:
Debian Release: trixie/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.11.4-amd64 (SMP w/20 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-perf depends on:
ii  libbabeltrace1     1.5.11-4
ii  libc6              2.40-3
ii  libcap2            1:2.66-5+b1
ii  libdebuginfod1t64  0.192-4
ii  libdw1t64          0.192-4
ii  libelf1t64         0.192-4
ii  liblzma5           5.6.3-1+b1
ii  libnuma1           2.0.18-1+b1
ii  libopencsd1        1.5.2-1+b1
ii  libperl5.40        5.40.0-6
ii  libpython3.12t64   3.12.7-3
ii  libslang2          2.3.3-5+b1
ii  libstdc++6         14.2.0-6
ii  libtraceevent1     1:1.8.4-1
ii  libunwind8         1.6.2-3.1
ii  libzstd1           1.5.6+dfsg-1+b1
ii  perl               5.40.0-6
ii  python3            3.12.6-1
ii  zlib1g             1:1.3.dfsg+really1.3.1-1+b1

linux-perf recommends no packages.

Versions of packages linux-perf suggests:
pn  linux-doc-6.11  <none>

-- no debconf information

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Thread

Bug#1088153: linux-perf: "perf script" is extremely slow Ralf Jung <post@ralfj.de> - 2024-11-24 11:00 +0100
  Bug#1088153: linux-perf: "perf script" is extremely slow Salvatore Bonaccorso <carnil@debian.org> - 2025-06-10 22:20 +0200
    Bug#1088153: linux-perf: "perf script" is extremely slow Ralf Jung <post@ralfj.de> - 2025-06-11 17:00 +0200
  Bug#1088153: marked as done (linux-perf: "perf script" is  extremely slow) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-06-11 18:20 +0200

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