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Message-ID: <20151012152732.GB29048@lerouge>
Date: Mon, 12 Oct 2015 17:27:33 +0200
From: Frederic Weisbecker <fweisbec@...il.com>
To: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Borislav Petkov <bp@...e.de>,
Chandler Carruth <chandlerc@...il.com>,
David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Stephane Eranian <eranian@...gle.com>,
Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 13/16] perf callchain: Switch default to
'graph,0.5,caller'
On Mon, Oct 05, 2015 at 06:03:35PM -0300, Arnaldo Carvalho de Melo wrote:
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
>
> Which is the most common default found in other similar tools.
>
> Requested-by: Ingo Molnar <mingo@...nel.org>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Chandler Carruth <chandlerc@...il.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Stephane Eranian <eranian@...gle.com>
> Cc: Wang Nan <wangnan0@...wei.com>
> Link: https://www.youtube.com/watch?v=nXaxk27zwlk
> Link: http://lkml.kernel.org/n/tip-v8lq36aispvdwgxdmt9p9jd9@git.kernel.org
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
> tools/perf/Documentation/perf-report.txt | 2 +-
> tools/perf/builtin-report.c | 4 ++--
> tools/perf/util/util.c | 4 ++--
> 3 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
> index ce499035e6d8..e4fdeeb51123 100644
> --- a/tools/perf/Documentation/perf-report.txt
> +++ b/tools/perf/Documentation/perf-report.txt
> @@ -192,7 +192,7 @@ OPTIONS
> when available. Usually more convenient to use --branch-history
> for this.
>
> - Default: fractal,0.5,callee,function.
> + Default: graph,0.5,caller
>
> --children::
> Accumulate callchain of children to parent entry so that then can
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index b5623639f67d..3b23b25d1589 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -633,7 +633,7 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
> bool has_br_stack = false;
> int branch_mode = -1;
> bool branch_call_mode = false;
> - char callchain_default_opt[] = "fractal,0.5,callee";
> + char callchain_default_opt[] = "graph,0.5,caller";
I'm a bit worried about that. I find callee order usually useful in most cases.
People tend to run perf to zoom in the culprit of a performance issue.
> const char * const report_usage[] = {
> "perf report [<options>]",
> NULL
> @@ -701,7 +701,7 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
> "Only display entries with parent-match"),
> OPT_CALLBACK_DEFAULT('g', "call-graph", &report, "output_type,min_percent[,print_limit],call_order[,branch]",
> "Display callchains using output_type (graph, flat, fractal, or none) , min percent threshold, optional print limit, callchain order, key (function or address), add branches. "
> - "Default: fractal,0.5,callee,function", &report_parse_callchain_opt, callchain_default_opt),
> + "Default: graph,0.5,caller", &report_parse_callchain_opt, callchain_default_opt),
> OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
> "Accumulate callchains of children and show total overhead as well"),
> OPT_INTEGER(0, "max-stack", &report.max_stack,
> diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> index ce465b259e52..c1bf9ff210b0 100644
> --- a/tools/perf/util/util.c
> +++ b/tools/perf/util/util.c
> @@ -17,9 +17,9 @@
> #include "callchain.h"
>
> struct callchain_param callchain_param = {
> - .mode = CHAIN_GRAPH_REL,
> + .mode = CHAIN_GRAPH_ABS,
And this worries me as well :-)
> .min_percent = 0.5,
> - .order = ORDER_CALLEE,
> + .order = ORDER_CALLER,
> .key = CCKEY_FUNCTION
> };
>
> --
> 2.1.0
>
--
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