linux-kernel - Re: [PATCH V2 5/6] perf,tools: caculate and save freq/CPU%/CORE_BUSY% in he

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Message-ID: <20150726163113.GB24646@krava.brq.redhat.com>
Date:	Sun, 26 Jul 2015 18:31:13 +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 5/6] perf,tools: caculate and save
 freq/CPU%/CORE_BUSY% in he_stat

On Fri, Jul 24, 2015 at 09:48:31AM -0400, kan.liang@...el.com wrote:

SNIP

>  		},
>  		.parent = sym_parent,
>  		.filtered = symbol__parent_filter(sym_parent) | al->filtered,
> @@ -481,6 +486,32 @@ iter_add_next_nop_entry(struct hist_entry_iter *iter __maybe_unused,
>  }
>  
>  static int
> +iter_add_single_freq_perf_entry(struct hist_entry_iter *iter, struct addr_location *al)
> +{
> +	struct perf_evsel *evsel = iter->evsel;
> +	struct perf_sample *sample = iter->sample;
> +	struct hist_entry *he;
> +	struct freq_perf_info info = {0};
> +	u64 *data = sample->freq_perf_data;
> +
> +	if (data[FREQ_PERF_REF_CYCLES] > 0)
> +		info.freq = (data[FREQ_PERF_CYCLES] * cpu_max_freq) / data[FREQ_PERF_REF_CYCLES];
> +	if (data[FREQ_PERF_TSC] > 0)
> +		info.cpu_u = (100 * data[FREQ_PERF_REF_CYCLES]) / data[FREQ_PERF_TSC];
> +	if (data[FREQ_PERF_MPERF] > 0)
> +		info.core_busy = (100 * data[FREQ_PERF_APERF]) / data[FREQ_PERF_MPERF];

seems to me the new iterator is too big gun for this,
why not initialize  'struct freq_perf_info' in
iter_prepare_normal_entry ?

jirka
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