linux-kernel - Re: [PATCH] perf script: add flamegraph.py script

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Date:   Tue, 24 Mar 2020 20:05:15 +0100
From:   Andreas Gerstmayr <agerstmayr@...hat.com>
To:     Kim Phillips <kim.phillips@....com>,
        linux-perf-users@...r.kernel.org
Cc:     Martin Spier <mspier@...flix.com>,
        Brendan Gregg <bgregg@...flix.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf script: add flamegraph.py script

On 24.03.20 17:16, Kim Phillips wrote:
> On Ubuntu 19.10, where python 2.7 is still the default, I get:
> 
> $ perf script report flamegraph
>    File "/usr/libexec/perf-core/scripts/python/flamegraph.py", line 46
>      print(f"Flame Graph template {self.args.template} does not " +
>                                                                 ^
> SyntaxError: invalid syntax
> Error running python script /usr/libexec/perf-core/scripts/python/flamegraph.py
> 
> Installing libpython3-dev doesn't help.

Hmm, I was hoping that I can drop support for Python 2 in 2020 ;) (it's 
officially EOL since Jan 1, 2020)

The Ubuntu 18.04 release notes mention that "Python 2 is no longer 
installed by default. Python 3 has been updated to 3.6. This is the last 
LTS release to include Python 2 in main." 
(https://wiki.ubuntu.com/BionicBeaver/ReleaseNotes) - so imho it should 
be fine to drop Python 2 support.

I tested it with a Ubuntu VM, and by default the Python bindings aren't 
enabled in perf (see 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1707875).

But you can compile perf and select Python 3:

$ make -j2 PYTHON=python3

in the perf source directory (libpython3-dev must be installed).


Does this work for you?


Cheers,
Andreas