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

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Message-ID: <28ce9bd0-dbbf-9e27-d40d-dafb0667a3b8@linux.intel.com>
Date:   Tue, 13 Aug 2019 08:49:30 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.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 8/12/2019 4:35 PM, Jiri Olsa wrote:
> 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
> 

Yes, it's cycles specific. Maybe --cycles-hist is better and the long 
option should be enough. We can reserve -n for future feature. :)

Thanks
Jin Yao