linux-kernel - Re: [PATCH v4 3/4] perf util: Flexible to set block info output formats

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Date:   Tue, 28 Jan 2020 10:21:51 +0100
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 v4 3/4] perf util: Flexible to set block info output
 formats

On Mon, Jan 27, 2020 at 08:31:23PM +0800, Jin, Yao wrote:
> 
> 
> On 1/20/2020 11:00 PM, Jin, Yao wrote:
> > 
> > 
> > On 1/20/2020 5:47 PM, Jiri Olsa wrote:
> > > On Thu, Jan 16, 2020 at 03:29:03AM +0800, Jin Yao wrote:
> > > 
> > > SNIP
> > > 
> > > > +                   block_hpps, nr_hpps);
> > > > -    perf_hpp_list__register_sort_field(&bh->block_list,
> > > > -        &block_fmts[PERF_HPP_REPORT__BLOCK_TOTAL_CYCLES_PCT].fmt);
> > > > +    /* Sort by the first fmt */
> > > > +    perf_hpp_list__register_sort_field(&bh->block_list,
> > > > &block_fmts[0].fmt);
> > > >   }
> > > > -static void process_block_report(struct hists *hists,
> > > > -                 struct block_report *block_report,
> > > > -                 u64 total_cycles)
> > > > +static int process_block_report(struct hists *hists,
> > > > +                struct block_report *block_report,
> > > > +                u64 total_cycles, int *block_hpps,
> > > > +                int nr_hpps)
> > > >   {
> > > >       struct rb_node *next = rb_first_cached(&hists->entries);
> > > >       struct block_hist *bh = &block_report->hist;
> > > >       struct hist_entry *he;
> > > > -    init_block_hist(bh, block_report->fmts);
> > > > +    if (nr_hpps > PERF_HPP_REPORT__BLOCK_MAX_INDEX)
> > > 
> > > hum, should be '>=' above.. ?
> > > 
> > > jirka
> > > 
> > 
> > '=' should be OK.
> > 
> > enum {
> >      PERF_HPP_REPORT__BLOCK_TOTAL_CYCLES_PCT,
> >      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
> > };
> > 
> > PERF_HPP_REPORT__BLOCK_MAX_INDEX is 6.
> > 
> > If nr_hpps is 6, for example, block_hpps[] is,
> > 
> >          int block_hpps[6] = {
> >              PERF_HPP_REPORT__BLOCK_TOTAL_CYCLES_PCT,
> >              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,
> >          };
> > 
> >          block_info__create_report(session->evlist,
> >                        rep->total_cycles,
> >                                            block_hpps, 6,
> >                                            &rep->nr_block_reports);
> > 
> > That should be legal.
> > 
> > Thanks
> > Jin Yao
> 
> Hi Jiri,
> 
> Does this explanation make sense?

ok, make sense

thanks,
jirka