linux-kernel - Re: [PATCH] perf scripts python: Let script to be python2 compliant

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Date:   Tue, 26 Jul 2022 13:54:37 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Akemi Yagi <toracat@...epo.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alan Bartlett <ajb@...epo.org>, Leo Yan <leo.yan@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-perf-users@...r.kernel.org, ElRepo <contact@...epo.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf scripts python: Let script to be python2 compliant

On Tue, Jul 26, 2022 at 1:35 PM Akemi Yagi <toracat@...epo.org> wrote:
>
> On Tue, Jul 26, 2022 at 12:43 PM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> >
> > Em Tue, Jul 26, 2022 at 10:52:31AM -0700, Ian Rogers escreveu:
>
> > > So I'm somewhat concerned about perf supporting unsupported
> > > distributions and this holding the code base back. RHEL7 was launched
> > > 8 years ago (June 10, 2014) and full support ended 3 years ago (August
> > > 6, 2019) [1]. Currently RHEL7 is in "Maintenance Support or
> > > Maintenance Support 2" phase which is defined to mean [2]:
> [...]
>
> > In this specific supporting things that people report using, like was
> > done in this case, isn't such a big problem.
> >
> > Someone reported a problem in a system they used, the author of the code
> > in question posted a patch allowing perf to be used in such old systems,
> > doesn't get in the way of newer systems, small patch, merged, life goes
> > on.
> >
> > Sometimes some organizations are stuck with some distro till they can go
> > thru re-certifications, bidding for new hardware, whatever, and then
> > they want to continue using the latest perf on those systems because
> > they want to benefit from new features we're working on that work on
> > such systems. If the cost is small, like in this case, I see no problems
> > to have perf working on such older systems.
> >
> > - Arnaldo
>
> Just wanted to make a note about the "old" systems.
>
> While RHEL 7 might be regarded as "old" in general, it may not be so
> in the world of Enterprise Linux. A graph of EPEL mirror stats [1],
> while it is from about a year ago, shows EL 7 (RHEL 7 and its
> rebuilds) has a huge user base and was still growing quite fast.

So if RedHat don't care to support it, why as developers should we?

> By the way, my main workstation runs RHEL 7. ;-)

So you need new tools that are broken so you can give pressure to
whoever is subjecting you to out-of-date distributions to pull their
fingers out and fix this ;-) You may also want to think about the
security of your system.

Thanks,
Ian

> Akemi
>
> [1] https://twitter.com/mattdm/status/1447224008831811588