linux-kernel - Re: [GIT PULL 00/10] perf/core improvements and fixes

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Message-ID: <CAJN39oiGpcfx85xpzCX7hB+4a+wWtNZLxLBs9Mmr8QgDPP=q7w@mail.gmail.com>
Date:	Mon, 20 Jun 2016 20:11:10 -0700
From:	Brendan Gregg <bgregg@...flix.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>,
	Ekaterina Tumanova <tumanova@...ux.vnet.ibm.com>,
	He Kuang <hekuang@...wei.com>, Jean Delvare <jdelvare@...e.de>,
	Jiri Olsa <jolsa@...hat.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Kan Liang <kan.liang@...el.com>, linux-kbuild@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Michal Marek <mmarek@...e.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Pekka Enberg <penberg@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, pi3orama@....com,
	Stephane Eranian <eranian@...gle.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Wang Nan <wangnan0@...wei.com>, Zefan Li <lizefan@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 00/10] perf/core improvements and fixes

On Mon, Jun 20, 2016 at 7:18 PM, Namhyung Kim <namhyung@...nel.org> wrote:
>
> Hi Arnaldo,
>
> On Mon, Jun 20, 2016 at 07:23:20PM -0300, Arnaldo Carvalho de Melo wrote:
> > Hi Ingo,
> >
> >       Please consider pulling,
> >
> > - Arnaldo
> >
> > The following changes since commit 02469a95096a549508c5adf61d84a1d72851c85b:
> >
> >   Merge tag 'perf-core-for-mingo-20160615' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core (2016-06-16 10:27:35 +0200)
> >
> > are available in the git repository at:
> >
> >   git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-core-for-mingo-20160620
> >
> > for you to fetch changes up to 2a0a7c72702bac1b87cd4d49196a334483386fab:
> >
> >   perf script: Add stackcollapse.py script (2016-06-20 17:50:39 -0300)
> >
> > ----------------------------------------------------------------
> > perf/core improvements and fixes:
> >
> > New features:
> >
> > . Add --dry-run option to 'perf record' to check if command line options can be
> >   parsed, but not doing any recording (Wang Nan)
> >
> > . Allow dumping the object files generated by llvm when processing eBPF
> >   scriptlet events (Wang Nan)
> >
> > - Add stackcollapse.py script to help generating flame graphs (Paolo Bonzini)
>
> I think this is already done by '-g folded'.  Please see:
>
>   http://www.brendangregg.com/blog/2016-04-30/linux-perf-folded.html
>

Pretty much. Two similar solutions were developed around the same
time. Although I have to use some awk to get "perf -g folded" in the
exact right format, and stackcollapse-perf.py does that directly.

Brendan

Brendan Gregg, Senior Performance Architect, Netflix