Re: [PATCH V4 1/7] perf,tools: introduce generic FEAT for CPU attributes

[Jiri Olsa]

On Tue, Aug 18, 2015 at 10:16:35AM -0400, Kan Liang wrote:

SNIP

> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 179b2bd..0a06fb8 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -862,6 +862,23 @@ write_it:
>  	return do_write_string(fd, buffer);
>  }
>  
> +#define MAX_FREQ_TAG_STR	"max_freq"
> +
> +static int write_cpu_attributes(int fd, struct perf_header *h __maybe_unused,
> +				struct perf_evlist *evlist __maybe_unused)
> +{
> +	u64 freq;
> +	int ret;
> +
> +	freq = get_cpu_max_freq();
> +
> +	ret = do_write_string(fd, MAX_FREQ_TAG_STR);
> +	if (ret)
> +		return ret;

why not store just the tag number? PERF_HEADER_CPU_MAX_FREQ

jirka
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