linux-kernel - Re: [PATCH v6 7/7] perf report: Sort by sampled cycles percent per block for tui

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Date:   Thu, 7 Nov 2019 14:19:10 +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 v6 7/7] perf report: Sort by sampled cycles percent per
 block for tui



On 11/7/2019 5:01 AM, Jiri Olsa wrote:
> On Tue, Nov 05, 2019 at 11:36:11AM +0800, Jin Yao wrote:
> 
> SNIP
> 
>>
>> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
>> ---
>>   tools/perf/builtin-report.c    | 27 ++++++++++++---
>>   tools/perf/ui/browsers/hists.c | 62 +++++++++++++++++++++++++++++++++-
>>   tools/perf/ui/browsers/hists.h |  2 ++
>>   tools/perf/util/block-info.c   | 12 +++++++
>>   tools/perf/util/block-info.h   |  3 ++
>>   tools/perf/util/hist.h         | 12 +++++++
>>   6 files changed, 112 insertions(+), 6 deletions(-)
>>
>> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
>> index 7a8b0be8f09a..af5a57d06f12 100644
>> --- a/tools/perf/builtin-report.c
>> +++ b/tools/perf/builtin-report.c
>> @@ -485,6 +485,22 @@ static size_t hists__fprintf_nr_sample_events(struct hists *hists, struct report
>>   	return ret + fprintf(fp, "\n#\n");
>>   }
>>   
>> +static int perf_evlist__tui_block_hists_browse(struct evlist *evlist,
>> +					       struct report *rep)
>> +{
>> +	struct evsel *pos;
>> +	int i = 0, ret;
>> +
>> +	evlist__for_each_entry(evlist, pos) {
>> +		ret = report__tui_browse_block_hists(&rep->block_reports[i++].hist,
>> +						     rep->min_percent, pos);
>> +		if (ret != 0)
>> +			return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>   static int perf_evlist__tty_browse_hists(struct evlist *evlist,
>>   					 struct report *rep,
>>   					 const char *help)
>> @@ -595,6 +611,11 @@ static int report__browse_hists(struct report *rep)
>>   
>>   	switch (use_browser) {
>>   	case 1:
>> +		if (rep->total_cycles_mode) {
>> +			ret = perf_evlist__tui_block_hists_browse(evlist, rep);
>> +			break;
>> +		}
> 
> it's good that most of it is in the block-info.c,
> however what I mean was to have a single report
> function for rep->total_cycles_mode, like:
> 
> 	report__browse_block_hists()
> 	{
> 		switch (use_browser) {
> 		case 1:
> 			ret = perf_evlist__tui_block_hists_browse(evlist, rep);
> 			break;
> 		case 0:
> 			ret = perf_evlist__tty_block_hists_browse(evlist, rep);
> 			break;
> 		...
> 	}
> 
> preferable in block-info.c as well
> 
> which would be hooked in report__browse_hists:
> 
> 	report__browse_hists()
> 	{
> 		if (rep->total_cycles_mode)
> 			return report__browse_block_hists();
> 		...
> 	}
> 

If we move all block implementations from builtin-report.c to 
block-info.c, one difficulty is that we can't reuse some codes in 
builtin-report.c. For example, reuse the function which prints the event 
stats (hists__fprintf_nr_sample_events)

# Total Lost Samples: 0
#
# Samples: 2M of event 'cycles'
# Event count (approx.): 2753248

So I want to achieve a balance. I move most of block codes to 
builtin-report.c but I have to keep a bit of them in builtin-report.c. I 
will implement that in v7.

> plus below
> 
> SNIP
> 
>> +
>> +static int block_hists_browser__title(struct hist_browser *browser, char *bf,
>> +				      size_t size)
>> +{
>> +	struct hists *hists = evsel__hists(browser->block_evsel);
>> +	const char *evname = perf_evsel__name(browser->block_evsel);
>> +	unsigned long nr_samples = hists->stats.nr_events[PERF_RECORD_SAMPLE];
>> +	int ret;
>> +
>> +	ret = scnprintf(bf, size, "# Samples: %lu", nr_samples);
>> +	if (evname)
>> +		scnprintf(bf + ret, size -  ret, " of event '%s'", evname);
>> +
>> +	return 0;
>> +}
>> +
>> +int block_hists_tui_browse(struct block_hist *bh, struct evsel *evsel,
>> +			   float min_percent)
>> +{
>> +	struct hists *hists = &bh->block_hists;
>> +	struct hist_browser *browser;
>> +	int key = -1;
>> +	static const char help[] =
>> +	" q             Quit \n";
>> +
>> +	browser = hist_browser__new(hists);
>> +	if (!browser)
>> +		return -1;
>> +
>> +	browser->block_evsel = evsel;
>> +	browser->title = block_hists_browser__title;
>> +	browser->min_pcnt = min_percent;
>> +
>> +	/* reset abort key so that it can get Ctrl-C as a key */
>> +	SLang_reset_tty();
>> +	SLang_init_tty(0, 0, 0);
>> +
>> +	while (1) {
>> +		key = hist_browser__run(browser, "? - help", true);
>> +
>> +		switch (key) {
>> +		case 'q':
>> +			goto out;
>> +		case '?':
>> +			ui_browser__help_window(&browser->b, help);
>> +			break;
>> +		default:
>> +			break;
>> +		}
>> +	}
>> +
>> +out:
>> +	hist_browser__delete(browser);
>> +	return 0;
>> +}
> 
> also could this go to block-info.c as well?
> 
> thanks,
> jirka
> 

I will move them to block-info.c

Thanks
Jin Yao