linux-kernel - Re: [PATCH v3 3/4] perf util: Flexible to set block info output formats

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Date:   Tue, 14 Jan 2020 08:57:36 +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 3/4] perf util: Flexible to set block info output
 formats



On 1/13/2020 6:10 PM, Jiri Olsa wrote:
> On Wed, Jan 08, 2020 at 07:03:53AM +0800, Jin Yao wrote:
> 
> SNIP
> 
>>   int report__browse_block_hists(struct block_hist *bh, float min_percent,
>>   			       struct evsel *evsel, struct perf_env *env,
>> -			       struct annotation_options *annotation_opts)
>> +			       struct annotation_options *annotation_opts,
>> +			       bool release)
>>   {
>>   	int ret;
>>   
>> @@ -451,13 +477,17 @@ int report__browse_block_hists(struct block_hist *bh, float min_percent,
>>   		symbol_conf.report_individual_block = true;
>>   		hists__fprintf(&bh->block_hists, true, 0, 0, min_percent,
>>   			       stdout, true);
>> -		hists__delete_entries(&bh->block_hists);
>> +		if (release)
>> +			hists__delete_entries(&bh->block_hists);
>> +
>>   		return 0;
>>   	case 1:
>>   		symbol_conf.report_individual_block = true;
>>   		ret = block_hists_tui_browse(bh, evsel, min_percent,
>>   					     env, annotation_opts);
>> -		hists__delete_entries(&bh->block_hists);
>> +		if (release)
>> +			hists__delete_entries(&bh->block_hists);
>> +
>>   		return ret;
>>   	default:
>>   		return -1;
>> diff --git a/tools/perf/util/block-info.h b/tools/perf/util/block-info.h
>> index bfa22c59195d..0bf01e3a423d 100644
>> --- a/tools/perf/util/block-info.h
>> +++ b/tools/perf/util/block-info.h
>> @@ -44,7 +44,8 @@ enum {
>>   struct block_report {
>>   	struct block_hist	hist;
>>   	u64			cycles;
>> -	struct block_fmt	fmts[PERF_HPP_REPORT__BLOCK_MAX_INDEX];
>> +	struct block_fmt	*fmts;
> 
> hum, couldn't you just keep the array and use it instead of allocating it?
> it will never be bigger than PERF_HPP_REPORT__BLOCK_MAX_INDEX, no?
> 
> we could get rid of that release code
> 

Yes, that makes sense. I will keep the array.

Thanks
Jin Yao

> 
> jirka
>