linux-kernel - Re: [PATCH v3 1/4] perf report: Support folded callchain mode on --stdio

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Date:	Tue, 3 Nov 2015 09:21:52 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Kan Liang <kan.liang@...el.com>
Subject: Re: [PATCH v3 1/4] perf report: Support folded callchain mode on
 --stdio

On Tue, Nov 03, 2015 at 04:18:28PM +0900, Namhyung Kim wrote:
> Add new call chain option (-g) 'folded' to print callchains in a line.
> The callchains are separated by semicolons, and preceded by (absolute)
> percent values and a space.
> 
> For example, following 20 lines can be printed in 3 lines with the
> folded output mode;
> 
>   $ perf report -g flat --no-children | grep -v ^# | head -20
>       60.48%  swapper  [kernel.vmlinux]  [k] intel_idle
>               54.60%
>                  intel_idle
>                  cpuidle_enter_state
>                  cpuidle_enter
>                  call_cpuidle
>                  cpu_startup_entry
>                  start_secondary
> 
>               5.88%
>                  intel_idle
>                  cpuidle_enter_state
>                  cpuidle_enter
>                  call_cpuidle
>                  cpu_startup_entry
>                  rest_init
>                  start_kernel
>                  x86_64_start_reservations
>                  x86_64_start_kernel
> 
>   $ perf report -g folded --no-children | grep -v ^# | head -3
>       60.48%  swapper  [kernel.vmlinux]  [k] intel_idle
>   54.60% intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary
>   5.88% intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel
> 
> This mode is supported only for --stdio now and intended to be used by
> some scripts like in FlameGraphs[1].  Support for other UI might be
> added later.
> 
> [1] http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html
> 
> Requested-by: Brendan Gregg <brendan.d.gregg@...il.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/ui/stdio/hist.c  | 54 +++++++++++++++++++++++++++++++++++++++++++++
>  tools/perf/util/callchain.c |  6 +++++
>  tools/perf/util/callchain.h |  3 ++-
>  3 files changed, 62 insertions(+), 1 deletion(-)

missing doc update, otherwise

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka
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