linux-kernel - [RFC/PATCH 0/5] perf report: Support folded callchain output (v1)

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Message-Id: <1446225338-20431-1-git-send-email-namhyung@kernel.org>
Date:	Sat, 31 Oct 2015 02:15:33 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	David Ahern <dsahern@...il.com>
Subject: [RFC/PATCH 0/5] perf report: Support folded callchain output (v1)

Hello,

This is what Brendan requested on the perf-users mailing list to
support FlameGraphs [1] more efficiently.  This patchset adds a few
more callchain options to adjust the output for it.

At first, 'folded' output mode was added.  The folded output puts all
calchain nodes in a line separated by semicolons, a space and the
value.

The value is now can be one of 'percent', 'period', or 'count'.  The
percent is current default output and the period is the raw number of
sample periods.  The count is the number of samples for each callchain.

Here's an example:

  $ perf report --no-children --show-nr-samples --stdio -g folded,count
  ...
    39.93%     80  swapper  [kernel.vmlinux]  [k] intel_idel
  intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary 57
  intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;... 23


  $ perf report --no-children --stdio -g percent
  ...
    39.93%  swapper  [kernel.vmlinux]  [k] intel_idel
            |
            ---intel_idle
               cpuidle_enter_state
               cpuidle_enter
               call_cpuidle
               cpu_startup_entry
               |
               |--28.63%-- start_secondary
               |
                --11.30%-- rest_init


  $ perf report --no-children --show-total-period --stdio -g period
  ...
    39.93%   13018705  swapper  [kernel.vmlinux]  [k] intel_idel
            |
            ---intel_idle
               cpuidle_enter_state
               cpuidle_enter
               call_cpuidle
               cpu_startup_entry
               |
               |--9334403-- start_secondary
               |
                --3684302-- rest_init


  $ perf report --no-children --show-nr-samples --stdio -g count
  ...
    39.93%     80  swapper  [kernel.vmlinux]  [k] intel_idel
            |
            ---intel_idle
               cpuidle_enter_state
               cpuidle_enter
               call_cpuidle
               cpu_startup_entry
               |
               |--57-- start_secondary
               |
                --23-- rest_init


You can get it from 'perf/callchain-fold-v1' branch on my tree:

  git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git

Any comments are welcome, thanks
Namhyung


[1] http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html


Namhyung Kim (5):
  perf report: Support folded callchain mode on --stdio
  perf callchain: Abstract callchain print function
  perf callchain: Add count fields to struct callchain_node
  perf report: Add callchain value option
  perf report: Fix segfault on -g fractral with --stdio

 tools/perf/Documentation/perf-report.txt | 13 +++--
 tools/perf/builtin-report.c              |  2 +-
 tools/perf/ui/browsers/hists.c           |  8 +--
 tools/perf/ui/gtk/hists.c                |  8 +--
 tools/perf/ui/stdio/hist.c               | 91 ++++++++++++++++++++++++++------
 tools/perf/util/callchain.c              | 87 +++++++++++++++++++++++++++++-
 tools/perf/util/callchain.h              | 24 ++++++++-
 tools/perf/util/util.c                   |  3 +-
 8 files changed, 203 insertions(+), 33 deletions(-)

-- 
2.6.2

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