linux-kernel - Re: [PATCH 4/5] perf tools: Introduce perf_callchain

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Date:	Mon, 22 Sep 2014 16:25:10 +0200
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>,
	David Ahern <dsahern@...il.com>,
	Milian Wolff <mail@...ianw.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] perf tools: Introduce perf_callchain_config()

On Sun, Sep 21, 2014 at 01:18:05AM +0900, Namhyung Kim wrote:
> This patch adds support for following config options to ~/.perfconfig file.
> 
>   [call-graph]
>     record-mode = dwarf
>     dump-size = 8192
>     print-type = fractal
>     order = callee
>     threshold = 0.5
>     print-limit = 128
>     sort-key = function
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/callchain.c | 33 +++++++++++++++++++++++++++++++++
>  tools/perf/util/callchain.h |  1 +
>  tools/perf/util/config.c    |  3 +++
>  3 files changed, 37 insertions(+)
> 
> diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
> index ba7297230143..ee489a1e3f4c 100644
> --- a/tools/perf/util/callchain.c
> +++ b/tools/perf/util/callchain.c
> @@ -168,6 +168,39 @@ parse_callchain_report_opt(const char *arg)
>  	return 0;
>  }
>  
> +int perf_callchain_config(const char *var, const char *value)
> +{
> +	if (prefixcmp(var, "call-graph."))
> +		return 0;
> +	var += 11; /* strlen("call-graph.") == 11 */

should we use sizeof("call-graph.") - 1 instead ?

jirka
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