linux-kernel - Re: [PATCH v2 02/11] perf c2c: Add dimensions for load hit

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Message-ID: <20210111082247.GD3241@leoy-ThinkPad-X240s>
Date:   Mon, 11 Jan 2021 16:22:47 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Joe Mario <jmario@...hat.com>, David Ahern <dsahern@...il.com>,
        Don Zickus <dzickus@...hat.com>, Al Grant <Al.Grant@....com>,
        James Clark <james.clark@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 02/11] perf c2c: Add dimensions for load hit

On Wed, Jan 06, 2021 at 04:38:19PM +0900, Namhyung Kim wrote:
> On Sun, Dec 13, 2020 at 10:39 PM Leo Yan <leo.yan@...aro.org> wrote:
> >
> > Add dimensions for load hit and its percentage calculation, which is to
> > be displayed in the single cache line output.
> >
> > Signed-off-by: Leo Yan <leo.yan@...aro.org>
> > ---
> >  tools/perf/builtin-c2c.c | 71 ++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 71 insertions(+)
> >
> > diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
> > index 3d5a2dc8b4fd..00014e3d81fa 100644
> > --- a/tools/perf/builtin-c2c.c
> > +++ b/tools/perf/builtin-c2c.c
> > @@ -1052,6 +1052,58 @@ percent_lcl_hitm_cmp(struct perf_hpp_fmt *fmt __maybe_unused,
> >         return per_left - per_right;
> >  }
> >
> > +static double percent_ld_hit(struct c2c_hist_entry *c2c_he)
> > +{
> > +       struct c2c_hists *hists;
> > +       int tot, st;
> > +
> > +       hists = container_of(c2c_he->he.hists, struct c2c_hists, hists);
> > +
> > +       st  = TOT_LD_HIT(&c2c_he->stats);
> > +       tot = TOT_LD_HIT(&hists->stats);
> > +
> > +       return percent(st, tot);
> 
> It's not clear to me what's different than percent_tot_ld_hit().

Yes, though these two functions are used for different view (
percent_tot_ld_hit() is for the brief one-line summary view,
percent_ld_hit() is used for the Pareto table), but I think you are
suggesting to consolidate the two functions to single function.

Will refine this in next version.

Thanks,
Leo