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

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Date:   Wed, 16 Oct 2019 12:15:43 +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 v2 3/5] perf report: Sort by sampled cycles percent per
 block for stdio

On Tue, Oct 15, 2019 at 10:53:18PM +0800, Jin, Yao wrote:

SNIP

> > > +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.

I did not mean reuse, just add new sort entries
to current sort framework

> 
> > 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.

understand, but it needs to be outside display function

also, can't you gather the block_info data gradually
during the sample processing?

jirka

> 
> 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
> >