linux-kernel - Re: [PATCH v3] perf diff: Report noisy for cycles diff

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Date:   Mon, 12 Aug 2019 10:35:49 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v3] perf diff: Report noisy for cycles diff

On Sat, Aug 10, 2019 at 07:30:29AM +0800, Jin Yao wrote:

SNIP

> +
> +		init_stats(&pair->diff.stats);
> +		init_spark_values(pair->diff.svals, NUM_SPARKS);
> +
> +		for (int i = 0; i < pair->block_info->num; i++) {
> +			u64 val;
> +
> +			if (i >= he->block_info->num || i >= NUM_SPARKS)
> +				break;
> +
> +			val = labs(pair->block_info->cycles_spark[i] -
> +				     he->block_info->cycles_spark[i]);
> +
> +			update_spark_value(pair->diff.svals, NUM_SPARKS,
> +					   &pair->diff.stats, val);
> +			update_stats(&pair->diff.stats, val);
> +		}
>  	}
>  }
>  
> @@ -1250,6 +1292,8 @@ static const struct option options[] = {
>  		    "Show period values."),
>  	OPT_BOOLEAN('F', "formula", &show_formula,
>  		    "Show formula."),
> +	OPT_BOOLEAN('n', "noisy", &show_noisy,
> +		    "Show cycles noisy - WARNING: use only with -c cycles."),

this should be more 'cycles' specific like --cycles-noisy or --cycles-hist?

also I dont think we should use 'n' for this, just the long option

jirka