linux-kernel - Re: ANNOUNCE: pahole v1.27 (reproducible builds, BTF kfuncs)

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Message-ID: <4154d202-5c72-493e-bf3f-bce882a296c6@gentoo.org>
Date: Wed, 12 Jun 2024 12:07:09 +0200
From: Matthias Schwarzott <zzam@...too.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>, dwarves@...r.kernel.org
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 bpf@...r.kernel.org, Alan Maguire <alan.maguire@...cle.com>,
 Jiri Olsa <jolsa@...nel.org>, Jan Engelhardt <jengelh@...i.de>,
 Viktor Malik <vmalik@...hat.com>, Eduard Zingerman <eddyz87@...il.com>,
 Jan Alexander Steffens <heftig@...hlinux.org>,
 Domenico Andreoli <cavok@...ian.org>,
 Dominique Leuenberger <dimstar@...nsuse.org>, Daniel Xu <dxu@...uu.xyz>,
 Yonghong Song <yonghong.song@...ux.dev>
Subject: Re: ANNOUNCE: pahole v1.27 (reproducible builds, BTF kfuncs)

Am 11.06.24 um 23:26 schrieb Arnaldo Carvalho de Melo:
> Hi,
>   
> 	The v1.27 release of pahole and its friends is out, supporting
> parallel reproducible builds and encoding kernel kfuncs in BTF, allowing
> tools such as bpftrace to enumerate the available kfuncs and obtain its
> function signatures and return types.
> 

Regarding packaging of pahole:
What is the state of the contained ostra-cg?
I have no clue what it is and how to use it. Is there still a use-case 
for it?

Starting it without arguments only shows the usage string.
Running it with two dummy arguments:
$ ostra-cg x y
Traceback (most recent call last):
   File "/usr/bin/ostra-cg", line 404, in <module>
     class_def = ostra.class_definition(class_def_file = "%s.fields" % 
traced_class,
 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/usr/share/dwarves/runtime/python/ostra.py", line 154, in __init__
     f = file(class_def_file)
         ^^^^
NameError: name 'file' is not defined. Did you mean: 'field'?

According to 
https://stackoverflow.com/questions/32131230/python-file-function the 
function file() does not exist in python3.

This part could be fixed by replacing it with open() but I wonder if 
this is worth it.

As nobody has complained about it being broken:
Should ostra just be removed?

Regards
Matthias