linux-kernel - Re: [PATCH v4] perf diff: Report noisy for cycles diff

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Date:   Thu, 15 Aug 2019 15:22:36 +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 v4] perf diff: Report noisy for cycles diff

On Tue, Aug 13, 2019 at 03:30:37PM +0800, Jin Yao wrote:

SNIP

>  static void
>  hpp__entry_unpair(struct hist_entry *he, int idx, char *buf, size_t size)
>  {
> @@ -1662,6 +1794,10 @@ static void data__hpp_register(struct data__file *d, int idx)
>  		fmt->color = hpp__color_cycles;
>  		fmt->sort  = hist_entry__cmp_nop;
>  		break;
> +	case PERF_HPP_DIFF__CYCLES_HIST:
> +		fmt->color = hpp__color_cycles_hist;
> +		fmt->sort  = hist_entry__cmp_nop;
> +		break;
>  	default:
>  		fmt->sort  = hist_entry__cmp_nop;
>  		break;
> @@ -1688,8 +1824,15 @@ static int ui_init(void)
>  		 *   PERF_HPP_DIFF__RATIO
>  		 *   PERF_HPP_DIFF__WEIGHTED_DIFF
>  		 */
> -		data__hpp_register(d, i ? compute_2_hpp[compute] :
> -					  PERF_HPP_DIFF__BASELINE);
> +		if (cycles_hist && (compute == COMPUTE_CYCLES)) {
> +			data__hpp_register(d, i ? PERF_HPP_DIFF__CYCLES :
> +						  PERF_HPP_DIFF__BASELINE);
> +			data__hpp_register(d, i ? PERF_HPP_DIFF__CYCLES_HIST :
> +						  PERF_HPP_DIFF__BASELINE);
> +		} else {
> +			data__hpp_register(d, i ? compute_2_hpp[compute] :
> +						  PERF_HPP_DIFF__BASELINE);
> +		}

I tink that something like this might be less confusing instead of above:

                if (cycles_hist && i && (compute == COMPUTE_CYCLES)) 
                        data__hpp_register(d, PERF_HPP_DIFF__CYCLES);

other than that the patch looks ok to me

jirka