[Bug 2089411] Re: python perf module missing in realtime kernel

This is fixed in Plucky 6.12.0-7.7 bootstrap kernel:
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/bootstrap

** Changed in: linux (Ubuntu Plucky)
Status: Confirmed => Fix Released

** Changed in: linux (Ubuntu Plucky)
Status: Fix Released => Fix Committed

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https://bugs.launchpad.net/bugs/2089411

Title:
python perf module missing in realtime kernel

Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Noble:
Confirmed
Status in linux source package in Oracular:
Confirmed
Status in linux source package in Plucky:
Fix Committed

Bug description:
[Impact]

ubuntu@ubuntu-plucky:~$ python3 -c 'import perf; [print(c) for c in perf.cpu_map()]'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/perf/__init__.py", line 24, in <module>
    raise KernelNotFoundError()
perf.KernelNotFoundError: WARNING: python perf module not found for kernel 6.12.0-4-generic

You may need to install the following packages for this specific kernel:
  linux-tools-6.12.0-4-generic-generic
You may also want to install of the following package to keep up to date:
  linux-tools-generic

This works only with the main generic kernel but not with any of the
derivatives. Packaging is broken and the perf python modules is
looking in the wrong place for the library.

[Test Plan]

Run:
$ python3 -c 'import perf; [print(c) for c in perf.cpu_map()]'
$ perf

The above must not result in errors.

[Where Problems Could Occur]

Potential issues when using the perf python module or any
scripts/binaries provided by the linux-tools packages.

[Original Description]

Issue is related to Bug #2051560
In using tuned profile realtime-virtual-host under the realtime kernel, the operating system would lose network connection. Further viewing of the tuned logs pointed to the following error:

ERROR tuned.units.manager: WARNING: python perf module not found
for kernel 6.8.1-1011-realtime

Researching online Bug #2051560 was discovered. However, it looks as
if the realtime kernel was not listed as fixed to include the perf
Python module that affects tuned.

Server info:

uname -a:

Linux 6.8.1-1011-realtime #11-Ubuntu SMP PREEMPT_RT Tue Oct 8 17:19:16 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
-----------------------

lsb_release -crid:

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 24.04.1 LTS
Release: 24.04
Codename: noble

-----------------------

apt policy linux-image-6.8.1-1011-realtime:

linux-image-6.8.1-1011-realtime:
  Installed: 6.8.1-1011.11
  Candidate: 6.8.1-1011.11
  Version table:
 *** 6.8.1-1011.11 500
        500 https://esm.ubuntu.com/realtime/ubuntu noble/main amd64 Packages
        100 /var/lib/dpkg/status

-----------------------

Realtime kernel was installed via Ubuntu Pro subscription.

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