linux-kernel - Re: [PATCH V2 1/6] perf,tools: save cpu max freq in perf header

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Date:	Sun, 26 Jul 2015 18:32:10 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	kan.liang@...el.com
Cc:	a.p.zijlstra@...llo.nl, acme@...nel.org, luto@...nel.org,
	mingo@...hat.com, eranian@...gle.com, ak@...ux.intel.com,
	mark.rutland@....com, adrian.hunter@...el.com, jolsa@...nel.org,
	namhyung@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/6] perf,tools: save cpu max freq in perf header

On Fri, Jul 24, 2015 at 09:48:27AM -0400, kan.liang@...el.com wrote:

SNIP

> diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
> index 0af9cec..6784677 100644
> --- a/tools/perf/util/cpumap.h
> +++ b/tools/perf/util/cpumap.h
> @@ -58,6 +58,7 @@ int max_node_num;
>  int *cpunode_map;
>  
>  int cpu__setup_cpunode_map(void);
> +unsigned int get_cpu_max_freq(void);
>  
>  static inline int cpu__max_node(void)
>  {
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 03ace57..287a488 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -862,6 +862,16 @@ write_it:
>  	return do_write_string(fd, buffer);
>  }
>  
> +static int write_cpu_max_freq(int fd, struct perf_header *h __maybe_unused,
> +			      struct perf_evlist *evlist __maybe_unused)
> +{
> +	u32 freq;
> +
> +	freq = get_cpu_max_freq() / 1000;

why dont you store it as u64 ?

jirka
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