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

Arnaldo Carvalho de Melo
2024-06-14T19:09:50Z

On Wed, Jun 12, 2024 at 12:07:09PM +0200, Matthias Schwarzott wrote:
> 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 need to make a decision on that, it is used to produce things like:

http://vger.kernel.org/~acme/ostra/callgraphs/sock/0xf61bf500/

As documented in:

https://git.kernel.org/pub/scm/devel/pahole/pahole.git/tree/README.ctracer

But yes, it needs to get retested after all these years to see how
difficult it would be to try and get it back working.

- Arnaldo

> 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