linux-kernel - Re: [PATCH v2 3/5] perf report: Sort by sampled cycles percent per block for stdio

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Date:   Tue, 15 Oct 2019 22:53:18 +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 v2 3/5] perf report: Sort by sampled cycles percent per
 block for stdio



On 10/15/2019 4:41 PM, Jiri Olsa wrote:
> On Tue, Oct 15, 2019 at 01:33:48PM +0800, Jin Yao wrote:
> 
> SNIP
> 
>> +enum {
>> +	PERF_HPP_REPORT__BLOCK_TOTAL_CYCLES_COV,
>> +	PERF_HPP_REPORT__BLOCK_LBR_CYCLES,
>> +	PERF_HPP_REPORT__BLOCK_CYCLES_PCT,
>> +	PERF_HPP_REPORT__BLOCK_AVG_CYCLES,
>> +	PERF_HPP_REPORT__BLOCK_RANGE,
>> +	PERF_HPP_REPORT__BLOCK_DSO,
>> +	PERF_HPP_REPORT__BLOCK_MAX_INDEX
>> +};
>> +
>> +static struct block_fmt block_fmts[PERF_HPP_REPORT__BLOCK_MAX_INDEX];
>> +
>> +static struct block_header_column{
>> +	const char *name;
>> +	int width;
>> +} block_columns[PERF_HPP_REPORT__BLOCK_MAX_INDEX] = {
>> +	[PERF_HPP_REPORT__BLOCK_TOTAL_CYCLES_COV] = {
>> +		.name = "Sampled Cycles%",
>> +		.width = 15,
>> +	},
>> +	[PERF_HPP_REPORT__BLOCK_LBR_CYCLES] = {
>> +		.name = "Sampled Cycles",
>> +		.width = 14,
>> +	},
>> +	[PERF_HPP_REPORT__BLOCK_CYCLES_PCT] = {
>> +		.name = "Avg Cycles%",
>> +		.width = 11,
>> +	},
>> +	[PERF_HPP_REPORT__BLOCK_AVG_CYCLES] = {
>> +		.name = "Avg Cycles",
>> +		.width = 10,
>> +	},
>> +	[PERF_HPP_REPORT__BLOCK_RANGE] = {
>> +		.name = "[Program Block Range]",
>> +		.width = 70,
>> +	},
>> +	[PERF_HPP_REPORT__BLOCK_DSO] = {
>> +		.name = "Shared Object",
>> +		.width = 20,
>> +	}
>>   };
> 
> so we already have support for multiple columns,
> why don't you add those as 'struct sort_entry' objects?
> 

For 'struct sort_entry' objects, do you mean I should reuse the 
"sort_dso" which has been implemented yet in util/sort.c?

For other columns, it looks we can't reuse the existing sort_entry objects.

> SNIP
> 
>> +{
>> +	struct block_hist *bh = &rep->block_hist;
>> +
>> +	get_block_hists(hists, bh, rep);
>> +	symbol_conf.report_individual_block = true;
>> +	hists__fprintf(&bh->block_hists, true, 0, 0, 0,
>> +		       stdout, true);
>> +	hists__delete_entries(&bh->block_hists);
>> +	return 0;
>> +}
>> +
>>   static int perf_evlist__tty_browse_hists(struct evlist *evlist,
>>   					 struct report *rep,
>>   					 const char *help)
>> @@ -500,6 +900,12 @@ static int perf_evlist__tty_browse_hists(struct evlist *evlist,
>>   			continue;
>>   
>>   		hists__fprintf_nr_sample_events(hists, rep, evname, stdout);
>> +
>> +		if (rep->total_cycles) {
>> +			hists__fprintf_all_blocks(hists, rep);
> 
> so this call kicks all the block info setup/count/print, right?
> 

Yes, all in this call.

> I thingk it shouldn't be in the output code, but in the code before..
> from what I see you could count block_info counts during the sample
> processing, no?
>

In sample processing, we just get all symbols and account the cycles per 
symbol. We need to create/count the block_info at some points after the 
sample processing.

Maybe it's not very good to put block info setup/count/print in a call, 
but it's really not easy to process the block_info during the sample 
processing.

Thanks
Jin Yao

> jirka
>