From: Jiri Olsa <jolsa@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
Ingo Molnar <mingo@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Linux Trace Devel <linux-trace-devel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [RFC] tools lib traceevent: How to do library versioning being in the Linux kernel source?
Date: Fri, 3 Jan 2020 00:49:50 +0100 [thread overview]
Message-ID: <20200102234950.GA14768@krava> (raw)
In-Reply-To: <20200102122004.216c85da@gandalf.local.home>
On Thu, Jan 02, 2020 at 12:20:04PM -0500, Steven Rostedt wrote:
> First, I hope everyone had a Happy New Year!
heya, Happy New Year! ;-)
>
> Next, Sudip has been working to get the libtraceevent library into
> Debian. As this has been happening, I've been working at how to get all
> the projects that use this, to use the library installed on the system
> if it does exist. I'm hoping that once it's in Debian, the other
> distros will follow suit.
>
> Currently, the home of libtraceevent lives in the Linux kernel source
> tree under tools/lib/traceevent. This was because perf uses it to parse
> the events, and it seemed logical (at the time) to use this location as
> the main source tree for the distributions.
>
> The problem I'm now having is that I'm looking at fixing and updating
> some of the code in this library, and since library versioning is
> critical for applications that depend on it, we need to have a way to
> update the versions, and this does not correspond with the Linux
> versions.
>
> For example, we currently have:
>
> libtraceevent.so.1.1.0
>
> If I make some bug fixes, I probably want to change it to:
>
> libtraceevent.so.1.1.1 or libtraceevent.so.1.2.0
>
> But if I change the API, which I plan on doing soon, I would probably
> need to update the major version.
>
> libtraceevent.so.2.0.0
>
> The thing is, we shouldn't be making these changes for every update
> that we send to the main kernel. I would like to have a minimum of tags
> to state what the version should be, and perhaps even branches for
> working on a development version.
>
> This is a problem with living in the Linux source tree as tags and
> branches in Linus's tree are for only the Linux kernel source itself.
> This may work fine for perf, as it's not a library and there's not
> tools depending on the version of it. But it is a problem when it comes
> to shared libraries.
>
> Should we move libtraceevent into a stand alone git repo (on
> kernel.org), that can have tags and branches specifically for it? We
> can keep a copy in the Linux source tree for perf to use till it
so libbpf 'moved' for this reason to github repo,
but keeping the kernel as the true/first source,
and updating github repo when release is ready
libbpf github repo is then source for fedora (and others)
package
> becomes something that is reliably in all distributions. It's not like
> perf doesn't depend on other libraries today anyway.
yep, we already have a way to link libbpf dynamicaly from package,
will work the same for libtraceevent
jirka
next prev parent reply other threads:[~2020-01-02 23:50 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-02 17:20 [RFC] tools lib traceevent: How to do library versioning being in the Linux kernel source? Steven Rostedt
2020-01-02 18:42 ` Arnaldo Carvalho de Melo
2020-01-02 23:46 ` Steven Rostedt
2020-01-02 22:43 ` Sudip Mukherjee
2020-01-03 23:19 ` Steven Rostedt
2020-01-07 13:15 ` Namhyung Kim
2020-01-02 23:49 ` Jiri Olsa [this message]
2020-01-02 23:58 ` Steven Rostedt
2020-01-03 0:09 ` Sudip Mukherjee
2020-01-03 13:36 ` Jiri Olsa
2020-01-03 18:29 ` Sudip Mukherjee
2020-01-03 23:16 ` Steven Rostedt
2020-01-06 15:19 ` Jiri Olsa
2020-01-06 16:26 ` Arnaldo Carvalho de Melo
2020-01-06 16:36 ` Steven Rostedt
2020-01-06 19:47 ` Arnaldo Carvalho de Melo
2020-01-06 20:14 ` Konstantin Ryabitsev
2020-01-06 22:00 ` Arnaldo Carvalho de Melo
2020-01-06 20:47 ` [kernel.org users] " Jason Gunthorpe
2020-01-06 20:52 ` Steven Rostedt
2020-01-07 17:44 ` Jason Gunthorpe
2020-01-06 18:22 ` Konstantin Ryabitsev
2020-01-03 12:17 ` Masami Hiramatsu
2020-01-03 23:12 ` Steven Rostedt
2020-01-05 13:18 ` Masami Hiramatsu
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