linux-kernel - Re: [PATCH] perf annotate: allow 's' on source code lines

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Message-ID: <6b07d15b7bd02a63eef8282b1844be57ba9cb044.camel@gmail.com>
Date:   Tue, 22 Jun 2021 09:58:47 +0200
From:   Riccardo Mancini <rickyman7@...il.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, Martin Liska <mliska@...e.cz>,
        Jason Yan <yanaijie@...wei.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf annotate: allow 's' on source code lines

Hi,

thank you for your comment.

On Mon, 2021-06-21 at 22:07 -0700, Ian Rogers wrote:
> On Mon, Jun 21, 2021 at 4:02 PM Riccardo Mancini <rickyman7@...il.com> wrote:
> > 
> > In perf annotate, when 's' is pressed on a line containing
> > source code, it shows the message "Only available for assembly
> > lines".
> > This patch gets rid of the error, moving the cursr to the next
> > available asm line (or the closest previous one if no asm line
> > is found moving forwards), before hiding source code lines.
> > 
> > Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
> > ---
> >  tools/perf/ui/browsers/annotate.c | 28 +++++++++++++++++++++++++---
> >  1 file changed, 25 insertions(+), 3 deletions(-)
> > 
> > diff --git a/tools/perf/ui/browsers/annotate.c
> > b/tools/perf/ui/browsers/annotate.c
> > index ad0a70f0edaf..eb94d20d0d13 100644
> > --- a/tools/perf/ui/browsers/annotate.c
> > +++ b/tools/perf/ui/browsers/annotate.c
> > @@ -343,6 +343,29 @@ static void annotate_browser__calc_percent(struct
> > annotate_browser *browser,
> >         browser->curr_hot = rb_last(&browser->entries);
> >  }
> > 
> > +static struct annotation_line *annotate_browser__find_next_asm_line(
> > +                                       struct annotate_browser *browser,
> > +                                       struct annotation_line *al)
> > +{
> > +       struct annotation_line *it = al;
> > +
> > +       /* find next asm line */
> > +       list_for_each_entry_continue(it, browser->b.top, node) {
> > +               if (it->idx_asm >= 0)
> > +                       return it;
> > +       }
> > +
> > +       /* no asm line found forwards, try backwards */
> > +       it = al;
> > +       list_for_each_entry_continue_reverse(it, browser->b.top, node) {
> > +               if (it->idx_asm >= 0)
> > +                       return it;
> > +       }
> > +
> > +       /* There are no asm lines */
> > +       return al;
> 
> Does this error case need handling in the caller?

Agreed.
I believe this should never happen, but in case it happens it will cause
problems.
I'll change it to return NULL and handle it in the caller.

Thanks,
Riccardo

> 
> Thanks,
> Ian
> 
> > +}
> > +
> >  static bool annotate_browser__toggle_source(struct annotate_browser
> > *browser)
> >  {
> >         struct annotation *notes = browser__annotation(&browser->b);
> > @@ -363,9 +386,8 @@ static bool annotate_browser__toggle_source(struct
> > annotate_browser *browser)
> >                 browser->b.index = al->idx;
> >         } else {
> >                 if (al->idx_asm < 0) {
> > -                       ui_helpline__puts("Only available for assembly
> > lines.");
> > -                       browser->b.seek(&browser->b, -offset, SEEK_CUR);
> > -                       return false;
> > +                       /* move cursor to next asm line */
> > +                       al = annotate_browser__find_next_asm_line(browser,
> > al);
> >                 }
> > 
> >                 if (al->idx_asm < offset)
> > --
> > 2.31.1
> >